@article{basinger_hestir_jennings_monks_everman_jordan_2022, title={Detection of Palmer amaranth (Amaranthus palmeri) and large crabgrass (Digitaria sanguinalis) with in situ hyperspectral remote sensing. I. Effects of weed density and soybean presence}, volume={70}, ISSN={["1550-2759"]}, url={https://doi.org/10.1017/wsc.2021.81}, DOI={10.1017/wsc.2021.81}, abstractNote={Abstract}, number={2}, journal={WEED SCIENCE}, author={Basinger, Nicholas T. and Hestir, Erin L. and Jennings, Katherine M. and Monks, David W. and Everman, Wesley J. and Jordan, David L.}, year={2022}, month={Mar}, pages={198–212} }
 @article{chaichitehrani_li_xu_allahdadi_hestir_keim_2019, title={A numerical study of sediment dynamics over Sandy Point dredge pit, west flank of the Mississippi River, during a cold front event}, volume={183}, ISSN={["1873-6955"]}, DOI={10.1016/j.csr.2019.06.009}, abstractNote={Sediment transport over Sandy Point dredge pit in the northern Gulf of Mexico during a cold front event in November 2014 was examined using a finely resolved numerical model. The Delft3D model was used to perform numerical experiments that simulate the effect of wind-generated waves, wind-driven currents, river discharge, and tides on sediment dynamics in Sandy Point dredge pit. The hydrodynamics and sediment models were validated and calibrated using field data of current, wave, water level, and suspended sediment concentration. Two potential sources of sediment were examined: fluvial sediment from the Mississippi River and resuspended sediments from the seabed. Results showed that during a cold front, shear stress from wave motions played a significant role in the resuspension of sediments in Sandy Point dredge pit. The maximum cold front-related wave impact on sediment resuspension could increase near-bed sediment concentration in Sandy Point dredge pit by 20–50 times. In addition, the results suggest that the primary source of sediment for Sandy Point dredge pit during a cold front was resuspension from the ambient seabed due to increased bottom shear stress by wind-induced waves and strong southward wind-driven currents. Currents dispersed sediments from the Mississippi River passes and inhibited riverine sediment supply from Sandy Point dredge pit. Results also showed that cold fronts contribute 16%–24% of the annual sedimentation in Sandy Point dredge pit.}, journal={CONTINENTAL SHELF RESEARCH}, author={Chaichitehrani, Nazanin and Li, Chunyan and Xu, Kehui and Allahdadi, Mohammad Nabi and Hestir, Erin L. and Keim, Barry D.}, year={2019}, month={Jul}, pages={38–50} }
 @article{basinger_jennings_monks_jordan_everman_hestir_waldschmidt_smith_brownie_2019, title={Interspecific and intraspecific interference of Palmer amaranth (Amaranthus palmeri) and large crabgrass (Digitaria sanguinalis) in sweetpotato}, volume={67}, ISSN={["1550-2759"]}, DOI={10.1017/wsc.2019.16}, abstractNote={Abstract}, number={4}, journal={WEED SCIENCE}, author={Basinger, Nicholas T. and Jennings, Katherine M. and Monks, David W. and Jordan, David L. and Everman, Wesley J. and Hestir, Erin L. and Waldschmidt, Matthew D. and Smith, Stephen C. and Brownie, Cavell}, year={2019}, month={Jul}, pages={426–432} }
 @article{basinger_jennings_monks_jordan_everman_hestir_bertucci_brownie_2019, title={Large crabgrass (Digitaria sanguinalis) and Palmer amaranth (Amaranthus palmeri) intraspecific and interspecific interference in soybean}, volume={67}, ISSN={["1550-2759"]}, url={https://doi.org/10.1017/wsc.2019.43}, DOI={10.1017/wsc.2019.43}, abstractNote={Abstract}, number={6}, journal={WEED SCIENCE}, author={Basinger, Nicholas T. and Jennings, Katherine M. and Monks, David W. and Jordan, David L. and Everman, Wesley J. and Hestir, Erin L. and Bertucci, Matthew B. and Brownie, Cavell}, year={2019}, month={Nov}, pages={649–656} }
 @article{coffer_hestir_2019, title={Variability in Trends and Indicators of CO2 Exchange Across Arctic Wetlands}, volume={124}, ISSN={["2169-8961"]}, DOI={10.1029/2018JG004775}, abstractNote={Abstract}, number={5}, journal={JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES}, author={Coffer, Megan M. and Hestir, Erin L.}, year={2019}, month={May}, pages={1248–1264} }
 @article{cherukuru_malthus_sherman_hestir_devilla_2017, title={Optical response associated with changing summer biogeochemical conditions in a turbid lake}, volume={63}, ISSN={["1873-5851"]}, DOI={10.1016/j.limno.2017.01.009}, abstractNote={Water quality degradation in inland water bodies during summer periods due to phytoplankton growth is a global problem. Lake Burley Griffin (LBG) in Canberra, Australia is an artificial, turbid, urban lake which is prone to water quality degradation in summer due to phytoplankton blooms. In Australia only limited (spatial, spectral and temporal) datasets are available that detail the full bio-optical condition of the water body during summer transformation processes. In this study, we conducted field campaigns in LBG to measure biogeochemical as well as inherent optical properties (IOP) during summer 2010 to understand the variability in the optical response. Optically active biogeochemical components such as total suspended solids (TSS), Chlorophyll- a (Chl- a ) and coloured dissolved organic matter (CDOM) varied over a wide range in response to changing environmental conditions during summer. The underwater optical environment was dominated by light scattering properties and the light absorption budget varied in response to changing CDOM and phytoplankton distributions. Specific inherent optical properties and spectral slopes of IOP observed here were different to other regional datasets, thus indicated the limitation in the extrapolation of optical models from other regions. Optical response as described by the scattering to absorption ratio and backscattering albedo showed that absorption due to CDOM and non-algal particulate matter (NAP) masked phytoplankton absorption features limiting the application of standard optical algorithms. A through description of bio-optical properties, relationships and their variability in response to changing summer biogeochemical conditions in a turbid optically complex lake is presented here.}, journal={LIMNOLOGICA}, author={Cherukuru, Nagur and Malthus, Tim J. and Sherman, Brad S. and Hestir, Erin L. and Devilla, Rosangela A.}, year={2017}, month={Mar}, pages={83–96} }
 @article{lymburner_botha_hestir_anstee_sagar_dekker_malthus_2016, title={Landsat 8: Providing continuity and increased precision for measuring multi-decadal time series of total suspended matter}, volume={185}, ISSN={["1879-0704"]}, DOI={10.1016/j.rse.2016.04.011}, abstractNote={The water clarity of many inland water bodies is under threat due to intensifying land use pressures in conjunction with changes in water levels that result from increasing demand and climate variability. The recent launch of Landsat 8 coupled with Geoscience Australia's recent reprocessing of the Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper (ETM +) archives over the whole of Australia to a consistent surface reflectance product enables sub continental scale spatio-temporal analysis of freshwater optical water quality in support of monitoring and decision making for water management agencies. In this research, we present an objective assessment of the potential of Landsat 5 TM, Landsat 7 ETM + and Landsat 8 Operational Land Imager (OLI) data for monitoring inland water quality dynamics over a number of lakes and reservoirs with a range of optical water types in New South Wales and Queensland, Australia. We used bio-optical modelling to develop sensor-specific total suspended matter (TSM) retrieval algorithms that account for the difference in relative spectral response between Landsat 7 ETM + and Landsat 8 OLI. We were able to compare the suitability of the different sensors for optical water quality measurements using water bodies that fell within Landsat path overlaps where Landsat images of surface reflectance were acquired within 24 h between Landsat 5 TM and Landsat 7 ETM + or Landsat 7 ETM + and Landsat 8 OLI. These water bodies represent a range of hydrological and limnological conditions, and enabled us to assess: 1) the comparability of TSM measurements retrieved from each sensor, and 2) the surface reflectance to image noise characteristics of Landsat 7 ETM + and Landsat 8 OLI. Comparisons of lake surface reflectance and noise equivalent reflectance difference show that the improved radiometric resolution and increased quantization of Landsat 8 OLI relative to Landsat 7 ETM + significantly reduce image noise and spectral heterogeneity, indicating that Landsat 8 OLI data are expected to provide more precise water quality retrievals relative to Landsat 7 ETM +. We found that: 1) the TSM retrievals from the different sensors are highly comparable; 2) Landsat 5 TM overestimated TSM relative to Landsat 7 ETM + by 6.4%; and 3) Landsat 7 ETM + overestimated TSM relative to Landsat 8 OLI by only 1.4%. Retrieved TSM values were highly correlated with independent in situ data acquired within 24 h of satellite overpass (r = 0.99) with a mean average error of 14 mg/L. The results demonstrate that time series analysis of TSM retrievals can be conducted across a wide range of lakes at the sub-continental scale to characterise the multi-decadal TSM dynamics.}, journal={REMOTE SENSING OF ENVIRONMENT}, author={Lymburner, Leo and Botha, Elizabeth and Hestir, Erin and Anstee, Janet and Sagar, Stephen and Dekker, Arnold and Malthus, Tim}, year={2016}, month={Nov}, pages={108–118} }
 @article{santos_khanna_hestir_greenberg_ustin_2016, title={Measuring landscape-scale spread and persistence of an invaded submerged plant community from airborne remote sensing}, volume={26}, ISSN={["1939-5582"]}, DOI={10.1890/15-0615}, abstractNote={Abstract}, number={6}, journal={ECOLOGICAL APPLICATIONS}, author={Santos, Maria J. and Khanna, Shruti and Hestir, Erin L. and Greenberg, Jonathan A. and Ustin, Susan L.}, year={2016}, month={Sep}, pages={1733–1744} }
 @article{conrad_bibian_weinersmith_de carion_young_crain_hestir_santos_sih_2016, title={Novel species interactions in a highly modified estuary: Association of largemouth bass with Brazilian waterweed Egeria densa}, volume={145}, DOI={10.1080/00028487.2015.1114521}, abstractNote={Abstract}, number={2}, journal={Transactions of the American Fisheries Society}, author={Conrad, J. L. and Bibian, A. J. and Weinersmith, K. L. and De Carion, D. and Young, M. J. and Crain, P. and Hestir, E. L. and Santos, M. J. and Sih, A.}, year={2016}, pages={249–263} }
 @article{hestir_schoellhamer_greenberg_morgan-king_ustin_2016, title={The Effect of Submerged Aquatic Vegetation Expansion on a Declining Turbidity Trend in the Sacramento-San Joaquin River Delta}, volume={39}, ISSN={["1559-2731"]}, DOI={10.1007/s12237-015-0055-z}, abstractNote={Submerged aquatic vegetation (SAV) has well-documented effects on water clarity. SAV beds can slow water movement and reduce bed shear stress, promoting sedimentation and reducing suspension. However, estuaries have multiple controls on turbidity that make it difficult to determine the effect of SAV on water clarity. In this study, we investigated the effect of primarily invasive SAV expansion on a concomitant decline in turbidity in the Sacramento-San Joaquin River Delta. The objective of this study was to separate the effects of decreasing sediment supply from the watershed from increasing SAV cover to determine the effect of SAV on the declining turbidity trend. SAV cover was determined by airborne hyperspectral remote sensing and turbidity data from long-term monitoring records. The turbidity trends were corrected for the declining sediment supply using suspended-sediment concentration data from a station immediately upstream of the Delta. We found a significant negative trend in turbidity from 1975 to 2008, and when we removed the sediment supply signal from the trend it was still significant and negative, indicating that a factor other than sediment supply was responsible for part of the turbidity decline. Turbidity monitoring stations with high rates of SAV expansion had steeper and more significant turbidity trends than those with low SAV cover. Our findings suggest that SAV is an important (but not sole) factor in the turbidity decline, and we estimate that 21–70 % of the total declining turbidity trend is due to SAV expansion.}, number={4}, journal={ESTUARIES AND COASTS}, author={Hestir, Erin Lee and Schoellhamer, David H. and Greenberg, Jonathan and Morgan-King, Tara and Ustin, Susan L.}, year={2016}, month={Jul}, pages={1100–1112} }
 @article{anderson_bergamaschi_sturtevant_knox_hastings_windham-myers_detto_hestir_drexler_miller_et al._2016, title={Variation of energy and carbon fluxes from a restored temperate freshwater wetland and implications for carbon market verification protocols}, volume={121}, ISSN={["2169-8961"]}, DOI={10.1002/2015jg003083}, abstractNote={Abstract}, number={3}, journal={JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES}, author={Anderson, Frank E. and Bergamaschi, Brian and Sturtevant, Cove and Knox, Sara and Hastings, Lauren and Windham-Myers, Lisamarie and Detto, Matteo and Hestir, Erin L. and Drexler, Judith and Miller, Robin L. and et al.}, year={2016}, month={Mar}, pages={777–795} }
 @article{hestir_brando_campbell_dekker_malthus_2015, title={The relationship between dissolved organic matter absorption and dissolved organic carbon in reservoirs along a temperate to tropical gradient}, volume={156}, ISSN={["1879-0704"]}, DOI={10.1016/j.rse.2014.09.022}, abstractNote={Recent and upcoming launches of new satellite sensors will provide the spatial, spectral and radiometric resolution to globally assess freshwater chromophoric dissolved organic matter (CDOM), and thus estimate dissolved organic carbon (DOC) concentration. However, estimating DOC from optical remote sensing requires a robust relationship between CDOM and DOC. This is particularly problematic for reservoirs because they have variable dissolved organic matter composition that complicates the CDOM–DOC relationship. We investigated six manmade reservoirs along a temperate to tropical gradient that represent a range of reservoir types and watershed conditions to determine whether a linear relation between CDOM and DOC could be established. We measured CDOM absorption and DOC concentration during the wet and dry seasons in the six reservoirs. We found the CDOM absorption coefficient and CDOM spectral slope were uncorrelated due to exogenous DOC inputs from multiple sources. Alone, the absorption coefficient of CDOM was a poor predictor of DOC concentration. Including both CDOM absorption coefficient and spectral slope in a multiple regression accounted for both composition and concentration, significantly improving the regression r2. By using both CDOM absorption coefficient and spectral slope, we identify a framework for a potential solution to overcome the influence of dissolved organic matter source and transformation history on the CDOM–DOC relationship. We conclude that local variability, seasonality and optical complexity should be considered in remote sensing based approaches for global freshwater DOC estimation.}, journal={REMOTE SENSING OF ENVIRONMENT}, author={Hestir, Erin L. and Brando, Vittorio and Campbell, Glenn and Dekker, Arnold and Malthus, Tim}, year={2015}, month={Jan}, pages={395–402} }
 @article{ustin_santos_hestir_khanna_casas_greenberg_2014, title={Developing the capacity to monitor climate change impacts in Mediterranean estuaries}, volume={16}, number={6}, journal={Evolutionary Ecology Research}, author={Ustin, S. L. and Santos, M. J. and Hestir, E. L. and Khanna, S. and Casas, A. and Greenberg, J.}, year={2014}, pages={529–550} }