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- Shah, SurajUniversity of the Chinese Academy of Sciences (author)
Evaluating the added value of multi-variable calibration of SWAT with remotely sensed evapotranspiration data for improving hydrological modeling
- Article/chapterEnglish2021
Publisher, publication year, extent ...
- Elsevier BV,2021
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- LIBRIS-ID:oai:lup.lub.lu.se:de240a47-d47f-4a42-a6cc-3622bcf807a2
- https://lup.lub.lu.se/record/de240a47-d47f-4a42-a6cc-3622bcf807a2URI
- https://doi.org/10.1016/j.jhydrol.2021.127046DOI
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- Language:English
- Summary in:English
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- Hydrological processes in a watershed consist of multiple sub-processes (such as plant growth, evapotranspiration, water yield, and soil–water balance) that have complex interactions. The common practice of calibrating hydrological models against only a single variable (e.g., streamflow) can lead to parameter uncertainty (also known as equifinality), resulting in significant uncertainties in the representation and simulation of sub-processes. As multi-variable calibration can be a potential solution to this issue, we tested the integration of spatially and temporally gridded remotely sensed evapotranspiration (RS-ET) data with the Soil and Water Assessment Tool (SWAT) hydrological model. This approach was intended to reduce equifinality by enhancing related hydrological sub-processes in both space and time rather than improving the evaluation metrics at the streamflow outlet. We further introduced the principle of repeated measure design in the calibration process, where the SWAT was calibrated under two different schemes: Scheme1 (using only streamflow data) and Scheme2 (using both RS-ET and streamflow data). The model's performance was evaluated using the concept of stability at multiple spatial scales (basin outlet, sub-basins, and hydrological response units) and aspects (different model outputs and most sensitive calibrated parameters). The significance of the difference between the stabilities produced by the two schemes was estimated using the Mann–Whitney U test. Testing this approach in Meichuan Basin (China) showed that Scheme2 substantially reduced equifinality for calibrated parameters and model outputs compared to Scheme1. In addition, the model solutions and outputs for Scheme2 were significantly different from Scheme1. Our results demonstrate the added value of using increasingly available open-access RS-ET data for improving hydrological model calibration.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
- Equifinality
- Evapotranspiration
- Manning Whitney U test
- MODIS
- Repeated measure design
- Stability
- SWAT
Added entries (persons, corporate bodies, meetings, titles ...)
- Duan, ZhengLund University,Lunds universitet,MERGE: ModElling the Regional and Global Earth system,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science(Swepub:lu)zh7785du (author)
- Song, XianfengUniversity of the Chinese Academy of Sciences (author)
- Li, RunkuiUniversity of the Chinese Academy of Sciences (author)
- Mao, HuihuiUniversity of the Chinese Academy of Sciences (author)
- Liu, JunzhiLanzhou University (author)
- Ma, TianxiaoUniversity of the Chinese Academy of Sciences (author)
- Wang, MingyuUniversity of the Chinese Academy of Sciences (author)
- University of the Chinese Academy of SciencesMERGE: ModElling the Regional and Global Earth system (creator_code:org_t)
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- In:Journal of Hydrology: Elsevier BV6030022-1694
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