Parameter regionalization of the FLEX-Global hydrological model

查看全文 作　　者：Jingjing [1,2]WANG;Hongkai [1,2]GAO;Min [1,2]LIU;Yongjian [3]DING;Yan [4]WANG;Fang [1,2]ZHAO;Jun [5]XIA

机构地区：[1]Key Laboratory of Geographic Information Science(Ministry of Education of China),Shanghai 200241,China;[2]School of Geographical Sciences,East China Normal University,Shanghai 200241,China;[3]State Key Laboratory^of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;[4]Journal Editorial Department of Anhui Agricultural University,Hefei 230036,China;[5]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China

出　　处：《Science China Earth Sciences》索引2021年第64卷第4期,共18页

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 42071081, 41801036 & 41911530191)。 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). 关键词：Global hydrological model Model performance Parameter regionalization

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Parameter regionalization of the FLEX-Global hydrological model

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