Article
Environmental Sciences
Siyi Wen, Zihan Liu, Yu Han, Yuyan Chen, Liangsi Xu, Qiongsa Li
Summary: This research analyzed the spatiotemporal variation characteristics of evapotranspiration (ET), relative moisture index (MI), and influencing factors of reference evapotranspiration (ET0) in Heilongjiang, China. The results showed that the spatial distribution of ET and PET exhibited a pattern of higher values in the southwest and lower values in the northwest, and higher values in the south and lower values in the north. ET0 increased while the annual MI decreased over the last 40 years. The importance of meteorological factors affecting ET0 ranked as average relative humidity > average wind speed > sunshine duration.
Article
Environmental Sciences
Ali Bennour, Li Jia, Massimo Menenti, Chaolei Zheng, Yelong Zeng, Beatrice Asenso Barnieh, Min Jiang
Summary: This study developed and applied a new approach to calibrate hydrological models using distributed geospatial remote sensing data in the Lake Chad Basin in Africa. Through sensitivity analysis and optimization of influential parameters, the model performance was significantly improved. The new approach of using remote sensing ETa for a limited period of time showed robustness and good performance.
Article
Astronomy & Astrophysics
Lei Huang, Tammo S. Steenhuis, Yong Luo, Qiuhong Tang, Ronglin Tang, Junqing Zheng, Wen Shi, Chen Qiao
Summary: This study compared various algorithms for estimating evapotranspiration and found that the original method had higher accuracy but some errors due to compensating inaccuracies. Six of the proposed algorithms underestimated daily ET, mainly because of inaccurate estimation of daily net radiation. One algorithm, using observed flux tower data for daily net radiation instead of estimated values, successfully calculated EF and ET with low relative errors.
EARTH AND SPACE SCIENCE
(2021)
Article
Environmental Sciences
Emilie Delogu, Albert Olioso, Aubin Allies, Jerome Demarty, Gilles Boulet
Summary: Continuous daily estimates of evapotranspiration (ET) are crucial for water management in agriculture. This study evaluates the performance of different reference quantities in reconstructing seasonal ET from sparse estimates, highlighting the importance of revisit frequency for accurate results. Additionally, simple methods like using global radiation can provide robust estimates at a seasonal scale.
Article
Environmental Sciences
Henrique Haas, Nathan G. F. Reaver, Ritesh Karki, Latif Kalin, Puneet Srivastava, David A. Kaplan, Carlos Gonzalez-Benecke
Summary: Forests play a critical role in the hydrologic cycle and it is important to accurately represent forest dynamics in watershed models. This study focuses on improving the representation of forest dynamics in the widely used Soil and Water Assessment Tool (SWAT) through species-specific re-parameterizations. The results show that the re-parameterized model outperforms the default model in simulating forest dynamics and has significant implications for water yield in the studied sites.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Hamid Salehi, Ali Shamsoddini, Seyed Majid Mirlatifi, Behnam Mirgol, Meisam Nazari
Summary: Producing daily actual evapotranspiration (ETa) maps with high spatial resolution for sugarcane farmlands in Iran is challenging. Three different scenarios were assessed, with the first scenario showing the best results and the third scenario showing the worst results.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Environmental Sciences
Shuai Zhang, Tamlin M. Pavelsky, Christopher D. Arp, Xiao Yang
Summary: A remote sensing-derived lake ice phenology database covering all lakes in Alaska from 2000 to 2019 was constructed to analyze the trends of earlier breakup and later freezeup of lake ice in the region. The dataset showed significant trends towards earlier or later ice breakup and freezeup for various lakes, with most significant trends observed in lakes north of the Brooks Range. This dataset contributes to the understanding of interactions between lake processes and climate change, supporting research on biogeochemical, limnological, and ecological regimes in Alaska and pan-Arctic regions.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Ecology
Katie A. McQuillan, Mirela G. Tulbure, Katherine L. Martin
Summary: The study finds that the constraint of water availability on forest evapotranspiration (ET) is decreasing, and the impact of drought on ET varies with elevation and slope. Over time, there is a decoupling of ET from water availability, which is accelerated at higher elevations and in areas with diffuse-porous trees. These findings suggest that reductions in downstream water availability could have negative impacts on runoff, downstream vegetation, and aquatic biodiversity.
Article
Engineering, Civil
Aubin Allies, Albert Olioso, Bernard Cappelaere, Gilles Boulet, Jordi Etchanchu, Helene Barral, Ibrahim Bouzou Moussa, Jean-Philippe Chazarin, Emilie Delogu, Hassane Bil-Assanou Issoufou, Ibrahim Mainassara, Monique Oi, Jerome Demarty
Summary: This study developed a data fusion approach to provide remote sensing-based continuous daily ET estimates at kilometric resolution in Sahelian areas. The fusion approach was evaluated against eddy-covariance measurements and land surface model simulations, and showed a very good agreement with both in situ measurements and simulations.
JOURNAL OF HYDROLOGY
(2022)
Article
Agriculture, Multidisciplinary
Haojie Li, Jiahua Zhang, Sha Zhang, Yun Bai
Summary: This study investigated the temporal and spatial variations of stomatal conductance parameter g(1) using Ensemble Kalman Filter and feedforward artificial neural network. The results showed that g(1) increased rapidly in spring and summer, decreased in autumn, and reached the lowest value in winter. The model based on artificial neural network improved the estimation of gross primary productivity and latent heat flux compared to the fixed g(1) model.
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2022)
Article
Environmental Sciences
Mehrad Bayat, Hosein Alizadeh, Barat Mojaradi
Summary: This paper introduces the application of multivariate data assimilation (DA) to the SWAT model (DA-SWAT) and discusses the limitations of existing integrated approaches. A new approach is proposed that allows the perfect integration of SWAT with any desired DA algorithm. The results show that multivariate assimilation improves the accuracy of SCF (Streamflow) estimation and mitigates the equifinality problem.
WATER RESOURCES RESEARCH
(2022)
Article
Water Resources
Prem B. Parajuli, Avay Risal, Ying Ouyang, Anita Thompson
Summary: This study compared the evapotranspiration (ET) derived from MODIS with that simulated by the SWAT model, finding that the ET derived from MODIS had lower coefficients of variation at different time scales, indicating lower sensitivity to crop growth in the field; while SWAT-simulated ET showed significant variations in different seasons, taking into account climatic, land use, soil, and slope conditions.
Article
Environmental Sciences
Henrique Haas, Latif Kalin, Puneet Srivastava
Summary: This study investigates the impact of forest characterization on watershed hydrological responses using the Soil and Water Assessment Tool (SWAT) model. By incorporating remote-sensing data, field observations, and published literature, an improved forest parameterization was developed and tested in two forested watersheds in the southeastern United States. The results show significant improvements in predicting leaf area index (LAI), biomass, and evapotranspiration (ET), highlighting the importance of accurately representing forest dynamics in hydrological models.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Peng Bai
Summary: This study compared three widely used remote sensing ET models and found that the PML model performs the best on both site and basin scales, possibly due to its land-cover-based parameter configuration and consideration of soil evaporation and transpiration responses to soil water deficit.
JOURNAL OF HYDROLOGY
(2023)
Article
Astronomy & Astrophysics
Lei Huang, Yong Luo, Tammo Steenhuis, Qiuhong Tang, Wei Cheng, Wen Shi, Xin Xia, Dingchi Zhao, Zhouyi Liao
Summary: Evapotranspiration (ET) is an important process that regulates heat and water transfer between land and the atmosphere. The VISEA(2023) model improves the accuracy of net radiation and ET by incorporating an atmosphere emissivity model and correcting the calculation of downward long-wave radiation on cloudy days. It demonstrates good agreement with measurements at seven ChinaFlux sites and outperforms other ET models in terms of accuracy and robustness.
EARTH AND SPACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Gabriela Rezende de Souza, Venkatesh Merwade, Luiz Fernando Coutinho de Oliveira, Marcelo Ribeiro Viola, Matheus de Sa Farias
Summary: This study generated a maximum streamflow regional function and evaluated the uncertainties in estimates for a basin in the South of Minas Gerais, Brazil. The performance of the regional function was classified as optimum for most watersheds but good in certain return periods. Uncertainties were larger in ungauged basins, especially for greater return periods and drainage areas.
Article
Environmental Sciences
Heather E. Golden, Charles R. Lane, Adnan Rajib, Qiusheng Wu
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Siddharth Saksena, Venkatesh Merwade, Peter J. Singhofen
Summary: This study quantifies the impact of different spatial scales on watershed response and proposes improving model structure to better represent physical processes. The research findings suggest that the relative intrinsic scales of surface-groundwater submodels may vary for different hydrogeological systems.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Ahmad A. Tavakoly, Joseph L. Gutenson, James W. Lewis, Michael L. Follum, Adnan Rajib, William Clay LaHatte, Chase O. Hamilton
Summary: This study quantified the impact of dam regulations on streamflow and flood inundation by directly inserting operational daily flow release data at 175 dam locations into a streamflow simulation in the Mississippi River Basin. The inclusion of reservoir releases substantially improved the performance of the streamflow model, especially in the drier western region.
WATER RESOURCES RESEARCH
(2021)
Article
Environmental Sciences
Grey R. Evenson, Heather E. Golden, Jay R. Christensen, Charles R. Lane, Adnan Rajib, Ellen D'Amico, David Tyler Mahoney, Elaheh White, Qiusheng Wu
Summary: Wetland restoration has a significant impact on nitrate dynamics in the Upper Mississippi River Basin, but the actual effectiveness may be lower than previously estimated. Wetlands can mitigate nitrogen surplus basin-wide, but may not be universally effective in tiled landscapes and due to river network processing.
ENVIRONMENTAL RESEARCH COMMUNICATIONS
(2021)
Article
Environmental Sciences
Manashi Paul, Adnan Rajib, Masoud Negahban-Azar, Adel Shirmohammadi, Puneet Srivastava
Summary: This study aimed to improve hydrological modeling by integrating remotely sensed data, which significantly enhanced the accuracy of estimating water and crop productivity under different irrigation schemes in semi-arid regions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Adnan Rajib, Qianjin Zheng, Heather E. Golden, Qiusheng Wu, Charles R. Lane, Jay R. Christensen, Ryan R. Morrison, Antonio Annis, Fernando Nardi
Summary: Floodplains provide essential ecosystem functions, but the majority of them have been substantially modified. Long-term land use data is crucial for supporting decision-making and management of floodplain restoration and conservation.
Article
Engineering, Civil
Ankit Ghanghas, Sayan Dey, Venkatesh Merwade
Summary: The reliability of the SRC method in the continental US was investigated, and it was found that the implicit model assumptions in the SRC approach introduce significant errors. The study also found that the accuracy of SRC is related to the characteristics of the stream, and evaluated its reliability in different regions.
JOURNAL OF HYDROLOGY
(2022)
Editorial Material
Multidisciplinary Sciences
Augusto Getirana, Nishan Kumar Biswas, Asad Sarwar Qureshi, Adnan Rajib, Sujay Kumar, Mujibur Rahman, Robin Kumar Biswas
Summary: Intensive irrigation and climate change are causing depletion of groundwater reserves in China, which is a rapidly developing nation. Researchers require more information on water usage, quality, flows, and forecasts to enhance water security.
Article
Environmental Sciences
Sayan Dey, Siddharth Saksena, Danielle Winter, Venkatesh Merwade, Sara McMillan
Summary: This study emphasizes the significance of river bathymetry in hydrodynamic and hydrologic processes, and its impact on subsurface processes. The study also demonstrates the importance of accurate bathymetric representation in simulating flooding-related physical processes.
WATER RESOURCES RESEARCH
(2022)
Article
Computer Science, Interdisciplinary Applications
Adnan Rajib, I. Luk Kim, Mehmet B. Ercan, Venkatesh Merwade, Lan Zhao, Carol Song, Kuan-Hung Lin
Summary: This paper introduces an approach to improve the efficiency of automatic calibration in hydrologic models through the expansion and enhancement of the web-based modeling platform SWATShare. Three implementation case studies are conducted to validate the effectiveness of SWATShare autocalibration. The results show that SWATShare autocalibration produces comparable streamflow hydrograph and parameter values to commonly used offline calibration methods, with the added advantage of producing more physically relevant parameter values in some instances. The design presented in this paper can serve as an Open Science blueprint for similar developments in other hydrologic models and Earth system sciences.
ENVIRONMENTAL MODELLING & SOFTWARE
(2022)
Article
Engineering, Civil
Tao Huang, Venkatesh Merwade
Summary: This study applied Bayesian Model Averaging (BMA) to evaluate the flood models of the Deep River and the Saint Marys River in Indiana, United States. The results showed that BMA predictions were more reliable than the original FEMA model and ensemble mean. The HBMA framework demonstrated the propagation of uncertainty sources and identified the relative impacts of individual sources in the flood modeling process.
JOURNAL OF HYDROLOGIC ENGINEERING
(2023)
Article
Engineering, Civil
Pankaj R. Dhote, Yogesh Joshi, Adnan Rajib, Praveen K. Thakur, Bhaskar R. Nikam, S. P. Aggarwal
Summary: Despite the efficiency issues of complex hydrodynamic models, topography-based approaches relying on Digital Elevation Models (DEMs) are increasingly being used as alternatives for floodplain mapping in data-scarce mountainous terrains. In this study, we compared three topography-based approaches along a 56-km river reach in the North West Himalayas to a reference inundation extent simulated by a hydrodynamic model. Our findings suggest that HAND and TWI produce more accurate floodplain maps compared to SP, with HAND demonstrating higher agreement with the model-simulated reference map. The study provides valuable insights for floodplain studies in developing countries with data scarcity.
JOURNAL OF HYDROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Ankit Ghanghas, Ashish Sharma, Sayan Dey, Venkatesh Merwade
Summary: This study investigates the pattern of changes in spatial extent of short duration extreme precipitation events globally by proposing a grid-based indicator named Spatial-Homogeneity. The results show that rising temperature leads to significant shrinking of precipitation extent in the tropics, but an expansion in arid regions; storms with higher precipitation intensity exhibit a faster decrease in spatial extent; and larger spatial extent storms are associated with higher total precipitable water. These findings imply that in a warming climate, tropical regions may experience severe floods as storms become more intense and spatially concentrated.
GEOPHYSICAL RESEARCH LETTERS
(2023)