Hydrological characteristics and changes in the Nu-Salween River basin revealed with model-based reconstructed data  

作　　者：YANG Fan LU Hui YANG Kun HUANG Guang-wei LI Yi-shan WANG Wei LU Ping TIAN Fu-qiang HUANG Yu-gang 

机构地区：[1]Ministry of Education Key Laboratory for Earth System Modeling,Department of Earth System Science,Tsinghua University,Beijing 100084,China [2]Ministry of Education Ecological Field Station for East Asian Migratory Birds,Beijing 100084,China [3]Center for Excellence in Tibetan Plateau Earth Sciences and National Tibetan Plateau Data Center,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [4]Graduate School of Global Environmental Studies,Sophia University,Tokyo 102-8554,Japan [5]Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China [6]Department of Hydraulic Engineering,State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China [7]The International Economic&Technical Cooperation and Exchange Center,Ministry of Water Resources,Beijing 100053,China

出　　处：《Journal of Mountain Science》2021年第11期2982-3002,共21页山地科学学报（英文）

基　　金：This work is jointly supported by the National Key Research and Development Program of China(2016YFA0601603);the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0206);the National Natural Science Foundation of China(91747101&41801260);the Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100103).

摘　　要：The Nu-Salween River(NSR),the longest free-flow river in Southeast Asia,plays an irreplaceable role in social development and ecological protection.The lower NSR region is particularly valuable as it is inhabited by approximately 6.7 million people.The basin has limited hydraulic conservancy infrastructure and insufficient ability to cope with climate change risks.Studying the hydrological characteristics and changes in the basin provides the scientific basis for rational protection and development of the basin.However,owing to the limitation of observation data,previous studies have focused on the local area and neglected the study of the lower reaches,which is not enough to reflect the spatial characteristics of the entire basin.In this study,the ECMWF 5th generation reanalysis data(ERA5)and Multi-Source Weighted-Ensemble Precipitation(MSWEP)were applied to develop a geomorphology-based hydrological model(GBHM)for reconstructing hydrological datasets(i.e.GBHM-ERA5 and GBHM-MSWEP).The reconstructed datasets covering the complete basin were verified against the gauge observation and compared with other commonly used streamflow products,including Global Flood Awareness System v2.1,GloFAS-Reanalysis dataset v3.0,and linear optimal runoff aggregate(LORA).The comparison results revealed that GBHM-ERA5 is significantly better than the other four datasets and provides a good reproduction of the hydrological characteristics and trends of the NSR.Detailed analysis of GBHM-ERA5 revealed that:(1)A multi-year mean surface runoff represented 39%of precipitation over the basin during 1980–2018,which had low surface runoff in the upstream,while areas around the Three Parallel Rivers Area and the estuary had abundant surface runoff.(2)The surface runoff and discharge coefficient of variations in spring were larger than those in other seasons,and the inter-annual variation in the downstream was smaller than that in the upstream and midstream regions.(3)More than 70%of the basin areas showed a decreasing trend in the surface ru

关 键 词：Nu-Salween River Distributed hydrologic model ERA5 Surface runoff DISCHARGE Climate Change 

分 类 号：P333[天文地球—水文科学]