@article{kassa_castro-bolinaga_guertault_fox_russell_brown_2023, title={Quantifying the Impact of Model Selection When Examining Bank Retreat and Sediment Transport in Stream Restoration}, volume={15}, ISSN={["2073-4441"]}, url={https://doi.org/10.3390/w15081448}, DOI={10.3390/w15081448}, abstractNote={The objective of this study was to assess the performance of form-based and process-based models, and of local-scale and reach-scale models, used to examine bank retreat and sediment transport in stream restoration. The evaluated models were the Bank Erosion Hazard Index (BEHI), Bank Assessment for Nonpoint Source Consequences of Sediment (BANCS), Bank Stability and Toe Erosion Model (BSTEM), and HEC River Analysis System (HEC-RAS 1D). Model-to-model assessments were conducted to quantify the impact of model selection when predicting applied stress and geomorphic change in a restored stream in North Carolina, USA. Results indicated that the mobility of the bed dictated model selection at the reach-scale. The process-based HEC-RAS 1D was needed to accurately analyze the sand-bed stream, predicting amounts of geomorphic change comparable to measured data and up to three orders of magnitude higher than those from local-scale models. At the local-scale, results indicated that the bank retreat mechanism and flow variability constrained model selection. The form-based BEHI and BANCS did not directly account for geotechnical failure nor capture severe floods, underpredicting amounts of geomorphic change by an order of magnitude when compared to the process-based BSTEM, and failing to characterize erosion potential and applied stresses after short-term morphodynamic adjustments.}, number={8}, journal={WATER}, author={Kassa, Kayla and Castro-Bolinaga, Celso and Guertault, Lucie and Fox, Garey A. A. and Russell, Periann and Brown, Emily D. D.}, year={2023}, month={Apr} }
 @article{reynolds_schaeffer_guertault_nelson_2023, title={Satellite and in situ cyanobacteria monitoring: Understanding the impact of monitoring frequency on management decisions}, url={https://doi.org/10.1016/j.jhydrol.2023.129278}, DOI={10.1016/j.jhydrol.2023.129278}, abstractNote={Cyanobacterial harmful algal blooms (cyanoHABs) in reservoirs can be transported to downstream waters via scheduled discharges. Transport dynamics are difficult to capture in traditional cyanoHAB monitoring, which can be spatially disparate and temporally discontinuous. The introduction of satellite remote sensing for cyanoHAB monitoring provides opportunities to detect where cyanoHABs occur in relation to reservoir release locations, like canal inlets. The study objectives were to assess (1) differences in reservoir cyanoHAB frequencies as determined by in situ and remotely sensed data and (2) the feasibility of using satellite imagery to identify conditions associated with release-driven cyanoHAB export. As a representative case, Lake Okeechobee and the St. Lucie Estuary (Florida, USA), which receives controlled releases from Lake Okeechobee, were examined. Both systems are impacted by cyanoHABs, and the St. Lucie Estuary experienced states of emergency for extreme cyanoHABs in 2016 and 2018. Using the European Space Agency’s Sentinel-3 OLCI imagery processed with the Cyanobacteria Index (CIcyano), cyanoHAB frequencies across Lake Okeechobee from May 2016-April 2021 were compared to frequencies from in situ data. Strong agreement was observed in frequency rankings between the in situ and remotely sensed data in capturing intra-annual variability in bloom frequencies across Lake Okeechobee (Kendall’s tau = 0.85, p-value = 0.0002), whereas no alignment was observed when evaluating inter-annual variation (Kendall’s tau = 0, p-value = 1). Further, remotely sensed observations revealed that cyanoHABs were highly frequent near the inlet to the canal connecting Lake Okeechobee to the St. Lucie Estuary in state-of-emergency years, a pattern not evident from in situ data alone. This study demonstrates how remote sensing can complement traditional cyanoHAB monitoring to inform reservoir release decision making.}, journal={Journal of Hydrology}, author={Reynolds, Natalie and Schaeffer, Blake A. and Guertault, Lucie and Nelson, Natalie G.}, year={2023}, month={Apr} }
 @article{fox_guertault_castro-bolinaga_swanson_2022, title={GUIDANCE ON APPLIED PRESSURE HEADS FOR QUANTIFYING COHESIVE SOIL ERODIBILITY WITH A JET EROSION TEST (JET)}, volume={65}, ISSN={["2769-3287"]}, DOI={10.13031/ja.14884}, abstractNote={Highlights Jet erosion test (JET) is a commonly used instrument for quantifying soil erodibility. Uncertainty remains on an appropriate applied pressure head to ensure high-quality JET data. Numerical analysis was used to derive minimum and maximum heads for four soil classifications. Ideal applied pressure heads depend on soil erodibility parameters and user-selected JET characteristics. Abstract . The Jet Erosion Test (JET) is one of the few instruments available for measuring cohesive soil erodibility in situ, but uncertainty remains regarding an appropriate initial applied pressure head for the test. Users typically iterate on an initial applied pressure head setting when testing soil. This iteration is necessary to ensure a reasonable erosion rate and the total amount of scour while imposing applied shear stresses that match the expected application range when using JET-derived erodibility parameters. This research used a numerical analysis of simulated JETs to determine both minimum and maximum applied pressure heads, ensuring a logistically appropriate estimation of soil erodibility parameters. First, the minimum head was set to generate at least 25 mm of scour, established based on data from previous in situ JETs. Second, the maximum applied pressure head was set to ensure that no excessively large initial applied shear stress impacted the estimation of erodibility parameters from a linear regression on erosion rates. Analyses were conducted for four selected soil erodibility classes: highly erodible, more erodible, erodible, and moderately resistant soils. Curves showing the ideal applied pressure ranges were generated for initial time intervals of scour depth measurements of 60, 90, 120, 180, 240, and 360 s and dimensionless initial nozzle heights of 1.00, 1.25, and 1.50. The appropriate range in the applied pressure head depended not only on the soil erodibility classes but also on the initial time interval for scour depth measurements, total test duration, and dimensionless initial nozzle height above the soil surface. Users should ensure that a minimum applied pressure head is exceeded for resistant soils. Maximum applied pressure heads should be considered for erodible, more erodible, and highly erodible soils, dependent on the initial time interval for scour depth measurements and dimensionless initial nozzle heights. Wider ranges of acceptable applied pressure heads were observed with smaller initial time intervals. The procedure presented in this research can be readily adapted by JET users to reflect specific testing conditions (e.g., different data collection intervals and test durations) for ensuring the a priori use of effective pressure head settings. Keywords: Cohesive soils, Erodibility, Jet erosion test, Pressure head, Soil erodibility.}, number={6}, journal={JOURNAL OF THE ASABE}, author={Fox, Garey A. and Guertault, Lucie and Castro-Bolinaga, Celso and Swanson, Alexis}, year={2022}, pages={1443–1450} }
 @article{fox_guertault_castro-bolinaga_allen_bigham_bonelli_hunt_kassa_langendoen_porter_et al._2022, title={PERSPECTIVE: LESSONS LEARNED, CHALLENGES, AND OPPORTUNITIES IN QUANTIFYING COHESIVE SOIL ERODIBILITY WITH THE JET EROSION TEST (JET)}, volume={65}, ISSN={["2769-3287"]}, url={http://dx.doi.org/10.13031/ja.14714}, DOI={10.13031/ja.14714}, abstractNote={Highlights The JET is a key instrument for in situ and laboratory measurement of soil erodibility. Operation and reporting guidelines are needed to ensure consistency across JETs and applications. JET design improvements and hydrodynamic studies are needed to inform proper analyses and limit operator effects. Erodibility databases should be developed that report JET, soil, and fluid properties. Keywords: Cohesive soils, Critical shear stress, Erodibility, Erosion, Jet Erosion Test, Scour.}, number={2}, journal={JOURNAL OF THE ASABE}, author={Fox, Garey A. and Guertault, Lucie and Castro-Bolinaga, Celso and Allen, Peter and Bigham, Kari A. and Bonelli, Stephane and Hunt, Sherry Lynn and Kassa, Kayla and Langendoen, Eddy J. and Porter, Erin and et al.}, year={2022}, pages={197–207} }
 @article{halihan_hager_guertault_fox_2021, title={DETECTING MACROPORE FINGERING USING TEMPORAL ELECTRICAL RESISTIVITY IMAGING}, volume={37}, ISSN={["1943-7838"]}, DOI={10.13031/aea.14294}, abstractNote={Highlights Single macropores can be detected using temporal electrical resistivity imaging under controlled conditions. Macropore flow can be detected based on preferentially wetted fingers of increased conductance. Macropore activation does not appear to require saturated surface conditions to induce preferential flow. Abstract. Riparian soils are uniquely susceptible to the formation of macropores, which are hypothesized to promote fast transport of water and contaminants through upper soil layers. Electrical Resistivity Imaging (ERI) can locate spatial heterogeneities in soil wetting patterns and evaluate differences due to vegetation, thus optimizing the design of riparian buffers. Temporal ERI (TERI) imaging was conducted in a fine and coarse field setting with artificial macropores to evaluate flow under unsaturated simulated rainfall conditions and saturated infiltrometer conditions. While single macropores are detectable using TERI datasets, the results in an average field setting would detect the wetted area surrounding a macropore, not the macropore itself. The results were similar for both the primary fine grain soil site in Oklahoma as well as the coarse grain site in North Carolina. TERI data indicated that without artificial conditions with low noise conditions, a single macropore would not be detected, a wetted zone would be the best detection. In ordinary field evaluation of natural macropores, the TERI technique would detect the wetted zone around a macropore similar to a high hydraulic conductivity zone in a heterogeneous soil matrix. Finally, the results confirmed that macropore activation does not require saturated conditions to generate preferential flow. Keywords: Hydrogeophysics, Preferential flowpaths, Riparian buffers, Temporal electrical resistivity imaging.}, number={5}, journal={APPLIED ENGINEERING IN AGRICULTURE}, author={Halihan, Todd and Hager, John P. and Guertault, Lucie and Fox, Garey A.}, year={2021}, pages={861–870} }
 @article{heeren_guertault_mankin_2021, title={PERSPECTIVE: PREFERENTIAL FLOW IN RIPARIAN BUFFERS: CURRENT RESEARCH AND FUTURE NEEDS}, volume={64}, ISSN={["2151-0040"]}, DOI={10.13031/trans.14732}, abstractNote={Highlights Preferential flow (PF) can critically reduce riparian buffer contaminant removal efficiency. This collection presents research on PF measurement, visualization, modeling, and contaminant transport impacts. Future needs include tools to identify landscape-scale PF areas and conservation practices. Future models for research and practice should account for PF in riparian buffers. Abstract . Preferential flow in riparian buffers can substantially compromise their effectiveness in reducing contaminants from overland runoff. The objective of this article is to introduce a collection of five articles on current research into subsurface preferential flow measurement, visualization, modeling, and impacts on contaminant fate and transport at scales ranging from the subsurface pore scale to the plot scale to the watershed scale. This collection presents selected works from a broader invited session on “Preferential flow and piping in riparian buffers” at the 2020 ASABE Annual International Meeting. Major findings include: new methodologies, such as light transmission and geophysics, to characterize subsurface preferential flow; an infiltration partitioning approach to quantify preferential flow from field experiments; a kinematic dispersive wave model to effectively simulate subsurface preferential flow; and the significant impact of surface concentrated flow pathways on pesticide fate and transport both upstream and within a riparian buffer. Future work is needed to develop methods and tools to identify PF areas and management solutions within a landscape, and to update both research and design models to better quantify and account for PF processes. Keywords: Best management practice, Buffer strip, Agricultural conservation practice, Filter strip, Macropore, Nonpoint-source pollution.}, number={6}, journal={TRANSACTIONS OF THE ASABE}, author={Heeren, Derek M. and Guertault, Lucie and Mankin, Kyle}, year={2021}, pages={1907–1911} }
 @article{fox_fox_guertault_2020, title={A CASE STUDY ON THE RELEVANCE OF THE JOURNAL IMPACT FACTOR}, volume={63}, ISSN={["2151-0040"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85085130127&partnerID=MN8TOARS}, DOI={10.13031/trans.13756}, abstractNote={Highlights Publication profiles of seven highly published authors were analyzed from Google Scholar profiles. Journal impact factor (JIF) not strongly correlated to citations in the first two years after publication. Significant correlation between the number of citations in the first two years and total citations to an article. More important to submit manuscripts to journals with appropriate readership than the highest JIF. Abstract. In today’s world of research publishing, authors are typically encouraged to submit manuscripts to journals with the highest possible journal impact factor (JIF). This approach inherently assumes that the higher the JIF, the more likely the article will be cited. However, calls to move away from the JIF are becoming more common. This study analyzes the publication profiles of seven authors who are members of the Natural Resources and Environmental Systems (NRES) community of the American Society of Agricultural and Biological Engineers (ASABE) and who frequently publish in ASABE journals. This study hypothesized that statistically significant correlations existed between the JIF and the (1) total number of citations, (2) number of citations per year, and/or (3) number of citations in the first two years after publication. Based on 999 articles published by these seven authors from 1982 to 2018, statistically significant but fairly low to moderate correlations were observed between the JIF and the total citations, citations per year, and citations in the first two years after publication. The greatest correlation was observed between the number of citations that an article received in the first two years after publication and the number of citations per year (or the total number of citations). Therefore, ensuring an appropriate readership to generate short-term citations was more important than the JIF. When compared to high-JIF journals, there were statistically fewer citations per year and fewer citations in the first two years after publication for articles published in ASABE journals. While ASABE journal articles possess high citation longevity (i.e., cited half-life), efforts to immediately improve short-term metrics should focus on attracting high-quality research and improving article visibility. To extrapolate these findings to a wider community, future research should investigate these correlations for researchers in other ASABE technical communities and at various career stages. Keywords: Citations, Journal citation factor, Journal impact factor, Peer review, Research impact.}, number={2}, journal={TRANSACTIONS OF THE ASABE}, author={Fox, G. A. and Fox, A. K. and Guertault, L.}, year={2020}, pages={243–249} }
 @article{guertault_fox_2020, title={Performance of preferential flow models in predicting infiltration through a remolded soil with artificial macropores}, volume={19}, ISSN={["1539-1663"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85097260363&partnerID=MN8TOARS}, DOI={10.1002/vzj2.20055}, abstractNote={Preferential flow in soils contributes to water and contaminant leaching to groundwater and subsurface drains. At practical scales, preferential flow is often neglected due to the lack of consensus or guidance on how to simulate this process. Dual-permeability (DP) approaches are a standard, but their applicability in practice is limited by the large number of parameters involved. The source-responsive (SR) model simulates preferential flow as flow films along the walls of macropores that interact with the soil matrix. The objective of this study was to evaluate the ability of the SR model and a DP model with calibration limited to macropore parameters to simulate hydrologic variables of interest for practical applications. Infiltration experiments were conducted in a 150-cm-long by 50-cm-wide by 40-cm-deep soil column with vertical artificial macropores, with preferential flow being the most prevalent flow process. Two macropore configurations and various rainfall rates were tested. The DP model provided relatively accurate predictions of the bottom drainage rates, but inaccurate soil parameter estimates resulted in poor predictions of matrix flow. Critical limitations in the SR model formulation were highlighted, and the model was revised. The refined SR model provided accurate predictions of bottom drainage rates and water contents under steady-state rainfall. The DP model with a reduced calibration appeared valid to estimate subsurface fluxes with negligible matrix flow. The SR model applicability is limited to steady-state scenarios with negligible matrix flow. Critical developments are needed for the SR model to be applicable in practice.}, number={1}, journal={VADOSE ZONE JOURNAL}, author={Guertault, Lucie and Fox, Garey A.}, year={2020} }
 @article{khanal_fox_guertault_2020, title={SOIL MOISTURE IMPACTS LINEAR AND NONLINEAR ERODIBILITY PARAMETERS FROM JET EROSION TESTS}, volume={63}, ISSN={["2151-0040"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85090917985&partnerID=MN8TOARS}, DOI={10.13031/trans.13835}, abstractNote={Highlights The jet erosion test (JET) remains the most commonly used instrument for measuring in situ erodibility. This research investigated the impact of soil moisture content below saturation on erodibility parameters. Erodibility parameters were derived for both linear and nonlinear detachment models. Higher soil moisture increased initial resistance to erosion but also increased erosion rate. Abstract . The jet erosion test (JET) is a commonly employed technique to measure the erodibility of soils in situ by estimating the parameters of linear and nonlinear cohesive sediment detachment models. However, additional research is needed to understand the effect of soil moisture, a critical in situ test condition, on the derived erodibility parameters. This study compared the erodibility parameters, i.e., critical shear stress (tc) and the erodibility coefficient (kd) for the linear excess shear stress equation and two parameters (b0 and b1) for a nonlinear detachment model, from laboratory JETs across two soil types with contrasting texture and moisture contents. The general pattern was that higher soil moisture content increased the soil’s initial resistance to erosion (i.e., higher tc and b1), but once erosion was initiated the rate of erosion was greater (i.e., higher kd and b0). The magnitude of the changes in the erodibility parameters across the three soil moisture profiles investigated in this research were statistically significant, with kd and b0 varying by as much as a factor of 3. This research also confirmed the greater impact of soil moisture content on kd and b0 as compared to tc and b1. For the range of shear stress applied during these JETs, a linear detachment model was more appropriate for the sandy loam soil but less so for the more cohesive clay loam soil, but results were limited to a narrow range in applied shear stress. The results further support existing research conclusions that in situ erodibility measurements obtained under one set of soil moisture conditions may need to be adjusted to better predict soil detachment during storm events. Keywords: Cohesive soil, Critical shear stress, Detachment model, Erodibility, Jet erosion test, Shear stress, Soil moisture.}, number={4}, journal={TRANSACTIONS OF THE ASABE}, author={Khanal, A. and Fox, G. A. and Guertault, L.}, year={2020}, pages={1123–1131} }
 @article{enlow_fox_boyer_stoecker_storm_starks_guertault_2018, title={A modeling framework for evaluating streambank stabilization practices for reach-scale sediment reduction}, volume={100}, ISSN={1364-8152}, url={http://dx.doi.org/10.1016/j.envsoft.2017.11.010}, DOI={10.1016/j.envsoft.2017.11.010}, abstractNote={Process-based models can predict stream response to streambank stabilization. However, a framework does not exist on how to explicitly utilize these models to evaluate stabilization measures prior to implementation. This research developed a framework to evaluate stabilization practices using hydraulic and sediment transport models, landowner preferences, construction costs, and effectiveness. This framework produces sediment reduction graphs to determine the stabilization length as well as cost graphs. The methodology was applied to Fivemile Creek in western Oklahoma. A CONCEPTS simulation was developed for a 10.25-km reach and several stabilization techniques (grade control, riprap toe, and vegetation) were simulated. Incorporating multiple stabilization practices simultaneously resulted in higher sediment loads, but also higher costs which were quantifiable using the framework. Vegetation with 2:1 bank slopes was the most cost-effective stabilization technique. With that said, the framework provided a process-based understanding of the system that also highlighted the need for grade control for long-term effectiveness.}, journal={Environmental Modelling & Software}, publisher={Elsevier BV}, author={Enlow, Holly K. and Fox, Garey A. and Boyer, Tracy A. and Stoecker, Art and Storm, Daniel E. and Starks, Patrick and Guertault, Lucie}, year={2018}, month={Feb}, pages={201–212} }
 @article{guertault_camenen_paquier_peteuil_2018, title={A one-dimensional process-based approach to study reservoir sediment dynamics during management operations}, volume={43}, ISSN={["1096-9837"]}, url={https://doi.org/10.1002/esp.4249}, DOI={10.1002/esp.4249}, abstractNote={A comprehensive understanding of the dynamics of erosion and sedimentation in reservoirs under different management conditions is required to anticipate sedimentation issues and implement effective sediment management strategies. This paper describes a unique approach combining fluvial geomorphology tools and morphodynamic modeling for analyzing the sediment dynamics of an elongated hydropower reservoir subjected to management operations: the Génissiat Reservoir on the Rhône River. Functional sub-reaches representative of the reservoir morphodynamics were delineated by adapting natural river segmentation methods to elongated reservoirs. The segmentation revealed the link between the spatial and temporal reservoir changes and the variability of longitudinal flow conditions during reservoir management operations. An innovative modeling strategy, incorporating the reservoir segmentation into two sediment transport codes, was implemented to simulate the dynamics of erosion and sedimentation at the reach scale during historic events. One code used a bedload approach, based on the Exner equation with a transport capacity formula, and the other used a suspended load approach based on the advection–dispersion equation. This strategy provided a fair quantification of the dynamics of erosion and sedimentation at the reach scale during different management operations. This study showed that the reservoir morphodynamics is controlled by bedload transport in upper reaches, graded suspended load transport of sand in middle reaches and suspended load transport of fine sediments in lower reaches. Eventually, it allowed a better understanding of the impact of dam management on sediment dynamics. Copyright © 2017 John Wiley & Sons, Ltd.}, number={2}, journal={EARTH SURFACE PROCESSES AND LANDFORMS}, publisher={Wiley-Blackwell}, author={Guertault, Lucie and Camenen, Benoit and Paquier, Andre and Peteuil, Christophe}, year={2018}, month={Feb}, pages={373–386} }
 @article{guertault_fox_brewer_2018, title={Geomorphic identification of physical habitat features in a large, altered river system}, volume={40}, ISSN={2267-1242}, url={http://dx.doi.org/10.1051/E3SCONF/20184002031}, DOI={10.1051/e3sconf/20184002031}, abstractNote={Altered flow regimes in streams can significantly affect ecosystems and disturb ecological processes, leading to species loss and extinction. Many river management projects use stream classification and habitat assessment approaches to design practical solutions to reverse or mitigate adverse effects of flow regime alteration on stream systems. The objective of this study was to develop a methodology to provide a primary identification of physical habitats in an 80-km long segment of the Canadian River in central Oklahoma. The methodology relied on basic geomorphic variables describing the stream and its floodplain that were derived from aerial imagery and Lidar data using Geographic Information Systems. Geostatistical tests were implemented to delineate habitat units. This approach based on high resolution data and did not require in-site inspection provided a relatively refined habitat delineation, consistent with visual observations. Future efforts will focus on validation via field surveys and coupling with hydro-sedimentary modeling to provide a tool for environmental flow decisions.}, journal={E3S Web of Conferences}, publisher={EDP Sciences}, author={Guertault, Lucie and Fox, Garey and Brewer, Shannon}, editor={Paquier, A. and Rivière, N.Editors}, year={2018}, pages={02031} }
 @article{guertault_fox_2018, title={Impact of Data Availability and Resolution on Long-Term Sedimentation Estimates in a Storage Reservoir}, volume={23}, ISSN={["1943-5584"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85051733278&partnerID=MN8TOARS}, DOI={10.1061/(ASCE)HE.1943-5584.0001699}, abstractNote={AbstractThe sustainability of worldwide reservoirs is threatened by the reduction of their storage capacity caused by continuous sediment accumulation. Many reservoirs are filling in at rates highe...}, number={10}, journal={JOURNAL OF HYDROLOGIC ENGINEERING}, author={Guertault, L. and Fox, G. A.}, year={2018}, month={Oct} }
 @article{guertault_camenen_paquier_faure_peteuil_2018, title={Interest of 1D modelling to study elongated dam reservoir: Application to the Génissiat reservoir on the French Upper Rhône,Apport de la modélisation hydro-sédimentaire 1D à l’étude d’une retenue de forme allongée: Application à la retenue de Génissiat sur le Haut-Rhône français}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85058463116&partnerID=MN8TOARS}, DOI={10.1051/lhb/2018034}, abstractNote={L'etude de la dynamique sedimentaire dans les retenues de barrage reste complexe du fait de la combinaison entre les evenements naturels et la gestion du barrage. Dans ce papier, nous montrons l'in...}, number={3}, journal={Houille Blanche}, author={Guertault, L. and Camenen, B. and Paquier, A. and Faure, J.-B. and Peteuil, C.}, year={2018}, pages={71–76} }
 @article{wardinski_guertault_fox_castro-bolinaga_2018, title={Suitability of a Linear Model for Predicting Cohesive Soil Detachment during Jet Erosion Tests}, volume={23}, ISSN={1084-0699 1943-5584}, url={http://dx.doi.org/10.1061/(ASCE)HE.1943-5584.0001690}, DOI={10.1061/(asce)he.1943-5584.0001690}, abstractNote={Cohesive soil detachment is a complex process that is typically simulated using simplified mathematical models such as the linear excess shear stress equation or power laws. The assumption of linearity between applied shear stresses and erosion rates has repeatedly been questioned, and several nonlinear models have been proposed as alternatives; however, recent studies demonstrated that over the limited range of tested shear stresses, nonlinear models did not describe erosion data significantly better than linear models did. Questions remain regarding the linearity of this relationship at higher ranges of applied shear stress. Laboratory mini jet erosion tests (JETs) were conducted on remolded samples of cohesive soils. A series of statistical tests were then performed to evaluate the suitability of a linear model for describing the relationship between applied shear stress and JET-derived erosion data. For most of the trials, the statistical analysis rejected the assumption of linearity between the erosion rate and applied shear stress. For certain trials, however, it was not possible to conclude on the nonlinearity of the erosion mechanism due to the limited number of erosion data points or the narrowness of the applied shear stress range. Additionally, even though the linear model could provide a good approximation of the erosion data derived using a standard in situ JET procedure typically limited to a narrow shear stress range, its extrapolation potential for prediction of erosion outside of the tested range is limited.}, number={9}, journal={Journal of Hydrologic Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Wardinski, K. M. and Guertault, L. and Fox, G. A. and Castro-Bolinaga, C. F.}, year={2018}, month={Sep}, pages={06018004} }
 @misc{brewer_worthington_mollenhauer_stewart_mcmanamay_guertault_moore_2018, title={Synthesizing models useful for ecohydrology and ecohydraulic approaches: An emphasis on integrating models to address complex research questions}, volume={11}, ISSN={["1936-0592"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85044862558&partnerID=MN8TOARS}, DOI={10.1002/eco.1966}, abstractNote={Ecohydrology combines empiricism, data analytics, and the integration of models to characterize linkages between ecological and hydrological processes. A challenge for practitioners is determining which models best generalizes heterogeneity in hydrological behaviour, including water fluxes across spatial and temporal scales, integrating environmental and socio-economic activities to determine best watershed management practices and data requirements. We conducted a literature review and synthesis of hydrologic, hydraulic, water quality, and ecological models designed for solving interdisciplinary questions. We reviewed 1,275 papers and identified 178 models that have the capacity to answer an array of research questions about ecohydrology or ecohydraulics. Of these models, 43 were commonly applied due to their versatility, accessibility, user-friendliness, and excellent user-support. Forty-one of 43 reviewed models were linked to at least 1 other model especially: Water Quality Analysis Simulation Program (linked to 21 other models), Soil and Water Assessment Tool (19), and Hydrologic Engineering Center's River Analysis System (15). However, model integration was still relatively infrequent. There was substantial variation in model applications, possibly an artefact of the regional focus of research questions, simplicity of use, quality of user-support efforts, or a limited understanding of model applicability. Simply increasing the interoperability of model platforms, transformation of models to user-friendly forms, increasing user-support, defining the reliability and risk associated with model results, and increasing awareness of model applicability may promote increased use of models across subdisciplines. Nonetheless, the current availability of models allows an array of interdisciplinary questions to be addressed, and model choice relates to several factors including research objective, model complexity, ability to link to other models, and interface choice.}, number={7}, journal={ECOHYDROLOGY}, author={Brewer, Shannon K. and Worthington, Thomas A. and Mollenhauer, Robert and Stewart, David R. and McManamay, Ryan A. and Guertault, Lucie and Moore, Desiree}, year={2018}, month={Oct} }
 @inproceedings{enlow_fox_. boyer_stoecker_storm_starks_guertault_2017, title={<i>A Modeling Framework for Evaluating Streambank Stabilization Practices for Reach-Scale Sediment Reduction</i>}, url={http://dx.doi.org/10.13031/aim.201700133}, DOI={10.13031/aim.201700133}, abstractNote={Abstract Process-based models can predict stream response to streambank stabilization. However, a framework does not exist on how to explicitly utilize these models to evaluate stabilization measures prior to implementation. This research developed a framework to evaluate stabilization practices using hydraulic and sediment transport models, landowner preferences, construction costs, and effectiveness. This framework produces sediment reduction graphs to determine the stabilization length as well as cost graphs. The methodology was applied to Fivemile Creek in western Oklahoma. A CONCEPTS simulation was developed for a 10.25-km reach and several stabilization techniques (grade control, riprap toe, and vegetation) were simulated. Incorporating multiple stabilization practices simultaneously resulted in higher sediment loads, but also higher costs which were quantifiable using the framework. Vegetation with 2:1 bank slopes was the most cost-effective stabilization technique. With that said, the framework provided a process-based understanding of the system that also highlighted the need for grade control for long-term effectiveness.}, booktitle={2017 Spokane, Washington July 16 - July 19, 2017}, publisher={American Society of Agricultural and Biological Engineers}, author={Enlow, Holly K and Fox, Garey A. and . Boyer, Tracy  A. and Stoecker, Art and Storm, Daniel  E. and Starks, Patrick and Guertault, Lucie}, year={2017} }
 @article{mcnichol_kassa_fox_miller_guertault_2017, title={Erodibility Parameters Derived from Jet and Flume Erosion Tests on Root-Permeated Soils}, volume={160}, ISSN={["1936-704X"]}, DOI={10.1111/j.1936-704x.2017.03244.x}, abstractNote={Flume tests and in situ jet erosion tests (JETs) allow for the process-based quantification of erodibility parameters of cohesive soils. In the excess shear stress model used to predict soil detachment, the critical shear stress (τc) corresponds to the stress at which fluvial forces can detach soil particles or aggregates and the erodibility coefficient (kd) governs the rate at which detachment occurs when the imposed shear exceeds τc. The primary objective of this research was to derive and compare erodibility parameters from flume tests and JETs on various root-permeated soil samples. Based on statistical analysis, erodibility coefficients from the flume tests were typically statistically similar to those derived with JETs. In order to further determine the capability of the JET to indicate differences in erodibility of root-permeated soils, this research then performed JETs on side-by-side in situ soils. The JETs on root-permeated soils estimated significantly higher τc but insignificant differences in kd compared to JETs on adjacent bare soil. A significant correlation was observed between exposed root surface area (TRSA) and τc, but no correlation between TRSA and kd or the equilibrium scour depth was observed. More flume and JET experiments are needed to clarify the relationship between root-permeated soils and erodibility parameters, and address a wider range of average root diameters than was considered in this research.}, number={1}, journal={JOURNAL OF CONTEMPORARY WATER RESEARCH & EDUCATION}, publisher={Wiley-Blackwell}, author={McNichol, Bailey and Kassa, Kayla and Fox, Garey and Miller, Ron and Guertault, Lucie}, year={2017}, month={Apr}, pages={119–131} }
 @article{enlow_fox_guertault_2017, title={Watershed Variability in Streambank Erodibility and Implications for Erosion Prediction}, volume={9}, ISSN={2073-4441}, url={http://dx.doi.org/10.3390/w9080605}, DOI={10.3390/w9080605}, abstractNote={Two fluvial erosion models are commonly used to simulate the erosion rate of cohesive soils: the empirical excess shear stress model and the mechanistic Wilson model. Both models include two soil parameters, the critical shear stress (τc) and the erodibility coefficient (kd) for the excess shear stress model and b0 and b1 for the Wilson model. Jet erosion tests (JETs) allow for in-situ determination of these parameters. JETs were completed at numerous sites along two streams in each the Illinois River and Fort Cobb Reservoir watersheds. The objectives were to use JET results from these streambank tests to investigate variability of erodibility parameters on the watershed scale and investigate longitudinal trends in streambank erodibility. The research also determined the impact of this variability on lateral retreat predicted by a process-based model using both the excess shear stress model and the Wilson model. Parameters derived from JETs were incorporated into a one-dimensional process-based model to simulate bank retreat for one stream in each watershed. Erodibility parameters varied by two to five and one to two orders of magnitude in the Illinois River watershed and Fort Cobb Reservoir watershed, respectively. Less variation was observed in predicted retreat by a process-based model compared to the input erodibility parameters. Uncalibrated erodibility parameters and simplified applied shear stress estimates failed to match observed lateral retreats suggesting the need for model calibration and/or advanced flow modeling.}, number={8}, journal={Water}, publisher={MDPI AG}, author={Enlow, Holly and Fox, Garey and Guertault, Lucie}, year={2017}, month={Aug}, pages={605} }
 @article{klavon_fox_guertault_langendoen_enlow_miller_khanal_2016, title={Evaluating a process-based model for use in streambank stabilization: insights on the Bank Stability and Toe Erosion Model (BSTEM)}, volume={42}, ISSN={0197-9337}, url={http://dx.doi.org/10.1002/ESP.4073}, DOI={10.1002/esp.4073}, abstractNote={Streambank retreat is a complex cyclical process involving subaerial processes, fluvial erosion, seepage erosion, and geotechnical failures and is driven by several soil properties that themselves are temporally and spatially variable. Therefore, it can be extremely challenging to predict and model the erosion and consequent retreat of streambanks. However, modeling streambank retreat has many important applications, including the design and assessment of mitigation strategies for stream revitalization and stabilization. In order to highlight the current complexities of modeling streambank retreat and to suggest future research areas, this paper reviewed one of the most comprehensive streambank retreat models available, the Bank Stability and Toe Erosion Model (BSTEM), which has recently been integrated with several popular hydrodynamic and sediment transport models including the Hydrologic Engineering Center's River Analysis System (HEC-RAS). The objectives of this paper were to: (i) comprehensively review studies that have utilized BSTEM and report their findings, (ii) address the limitations of the model so that it can be applied appropriately in its current form, and (iii) suggest directions of research that will help make the model a more useful tool in future applications. The paper includes an extensive overview of peer reviewed studies to guide future users of BSTEM. The review demonstrated that the model needs further testing and evaluation outside of the central United States. Also, further development is needed in terms of accounting for spatial and temporal variability in geotechnical and fluvial erodibility parameters, incorporating subaerial processes, and accounting for the influence of riparian vegetation on streambank pore-water pressure dynamics, applied shear stress, and erodibility parameters. Copyright © 2016 John Wiley & Sons, Ltd.}, number={1}, journal={Earth Surface Processes and Landforms}, publisher={Wiley}, author={Klavon, Kate and Fox, Garey and Guertault, Lucie and Langendoen, Eddy and Enlow, Holly and Miller, Ron and Khanal, Anish}, year={2016}, month={Dec}, pages={191–213} }
 @article{guertault_camenen_peteuil_paquier_faure_2016, title={One-dimensional modeling of suspended sediment dynamics in dam reservoirs}, volume={142}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84988591480&partnerID=MN8TOARS}, DOI={10.1061/(ASCE)HY.1943-7900.0001157}, abstractNote={Continuous sedimentation of fine sediments in dam reservoirs triggers considerable economic and ecological impacts worldwide. The definition of appropriate reservoir management procedures requires accurate tools for predicting the sediment dynamics both in the reservoir and downstream reaches. In this article, a one-dimensional numerical model aiming to reproduce suspended sediment dynamics is presented. To take into account water intake locations and vertical distribution of suspended sediments in areas of larger water depths close to dams, an additional module is developed. The model is applied to a reach of the French Upper Rhône River, including two reservoirs. The calibrated model provides accurate flux estimates and reproduces erosion and deposition patterns observed in the reservoir for several scenarios. The additional module allows to improve the estimation of the sand load released by low-level outlets. Eventually, the model could be used either to provide insights on the outcome of past flushing operations or as a predictive tool to prepare future operations.}, number={10}, journal={Journal of Hydraulic Engineering}, publisher={American Society of Civil Engineers (ASCE)}, author={Guertault, Lucie and Camenen, Benoit and Peteuil, Christophe and Paquier, André and Faure, Jean Baptiste}, year={2016}, pages={04016033} }
 @article{fox_sheshukov_cruse_kolar_guertault_gesch_dutnell_2016, title={Reservoir Sedimentation and Upstream Sediment Sources: Perspectives and Future Research Needs on Streambank and Gully Erosion}, volume={57}, ISSN={0364-152X 1432-1009}, url={http://dx.doi.org/10.1007/S00267-016-0671-9}, DOI={10.1007/s00267-016-0671-9}, abstractNote={The future reliance on water supply and flood control reservoirs across the globe will continue to expand, especially under a variable climate. As the inventory of new potential dam sites is shrinking, construction of additional reservoirs is less likely compared to simultaneous flow and sediment management in existing reservoirs. One aspect of this sediment management is related to the control of upstream sediment sources. However, key research questions remain regarding upstream sediment loading rates. Highlighted in this article are research needs relative to measuring and predicting sediment transport rates and loading due to streambank and gully erosion within a watershed. For example, additional instream sediment transport and reservoir sedimentation rate measurements are needed across a range of watershed conditions, reservoir sizes, and geographical locations. More research is needed to understand the intricate linkage between upland practices and instream response. A need still exists to clarify the benefit of restoration or stabilization of a small reach within a channel system or maturing gully on total watershed sediment load. We need to better understand the intricate interactions between hydrological and erosion processes to improve prediction, location, and timing of streambank erosion and failure and gully formation. Also, improved process-based measurement and prediction techniques are needed that balance data requirements regarding cohesive soil erodibility and stability as compared to simpler topographic indices for gullies or stream classification systems. Such techniques will allow the research community to address the benefit of various conservation and/or stabilization practices at targeted locations within watersheds.}, number={5}, journal={Environmental Management}, publisher={Springer Science and Business Media LLC}, author={Fox, G. A. and Sheshukov, A. and Cruse, R. and Kolar, R. L. and Guertault, L. and Gesch, K. R. and Dutnell, R. C.}, year={2016}, month={Feb}, pages={945–955} }
 @inproceedings{guertault_camenen_paquier_peteuil_2014, title={1D modelling of fine sediments dynamics in a dam reservoir during a flushing event}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84906862093&partnerID=MN8TOARS}, DOI={10.1201/b17397-19}, booktitle={Reservoir Sedimentation - Special Session on Reservoir Sedimentation of the 7th International Conference on Fluvial Hydraulics, RIVER FLOW 2014}, publisher={CRC Press}, author={Guertault, L and Camenen, B and Paquier, A and Peteuil, C}, year={2014}, pages={147–154} }
 @article{guertault_camenen_peteuil_paquier_2014, title={Long term evolution of a dam reservoir subjected to regular flushing events}, volume={39}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84897465751&partnerID=MN8TOARS}, DOI={10.5194/adgeo-39-89-2014}, abstractNote={Abstract. An analysis of the long term morphological evolution of the Génissiat reservoir (France) is provided. First, a methodology for bathymetric data processing and reservoir sediment volume budget calculation is described. An estimation of global uncertainties in volume calculation is proposed. The reservoir bathymetric budget for several dam flushing events and interflush periods is presented, showing the global decrease of deposited sediment volume with time. The spatial dynamics of the reservoir subreaches is highlighted and typical patterns in flush and interflush periods are identified.}, journal={Advances in Geosciences}, publisher={Copernicus GmbH}, author={Guertault, L. and Camenen, B. and Peteuil, C. and Paquier, A.}, year={2014}, pages={89–94} }