| Parameter regionalization of the FLEX-Global hydrological model |
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| 作者姓名： | Jingjing WANG Hongkai GAO Min LIU Yongjian DING Yan WANG Fang ZHAO Jun XIA |
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| 作者单位： | Key Laboratory of Geographic Information Science（Ministry of Education of China）;School of Geographical Sciences;State Key Laboratory^of Cryospheric Science;Journal Editorial Department of Anhui Agricultural University;State Key Laboratory of Water Resources and Hydropower Engineering Science |
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| 基金项目： | supported by the National Natural Science Foundation of China (Grant Nos. 42071081, 41801036 & 41911530191)。 |
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| 摘 要： | Global hydrological models(GHMs) are important tools for addressing worldwide change-related water resource problems from a global perspective. However, the development of these models has long been hindered by their low accuracy. In order to improve the streamflow simulation accuracy of GHMs, we developed a GHM—the FLEX-Global—based on the regionalization of hydrological model parameters. The FLEX-Global model is primarily based on the framework of the FLEX hydrological model coupled with the HAND-based Storage Capacity curve(HSC) runoff generation module to calculate net rainfall, and uses the global river-routing Ca Ma-Flood model to calculate river network routing. This new model allows for streamflow simulation at a spatial resolution of 0.5°×0.5° and a temporal resolution of 1 day in global catchments. To validate FLEX-Global accuracy, the FLEX-Global-simulated streamflow of 26 major rivers distributed in five different climate zones was compared with the observed data from the Global Runoff Data Center(GRDC). Next, the model performance of FLEXGlobal was further verified by comparing it with that of seven existing GHMs with varying accuracy in the five climate zones.Multi-metric evaluation indicated that the streamflow simulation accuracy was improved by the FLEX-Global model with regionalized parameters, especially in the tropical and dry climate zones. This newly-developed GHM with regionalized parameters can provide scientific support for the assessment of climate change impact, optimization of global water resource mangement, simulation of Earth's multi-sphere coupling, and implementation of the Inter-Sectoral Impact Model Intercomparison Project(ISIMIP).
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| 关 键 词： | Global hydrological model Model performance Parameter regionalization |
Parameter regionalization of the FLEX-Global hydrological model |
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| Jingjing WANG,Hongkai GAO,Min LIU,Yongjian DING,Yan WANG,Fang ZHAO,Jun XIA.Parameter regionalization of the FLEX-Global hydrological model[J].Science China Earth Sciences,2021(4):571-588. |
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