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首页> 外文期刊>The Science of the Total Environment >Reconstruction and evaluation of changes in hydrologic conditions over a transboundary region by a regional climate model coupled with a physically-based hydrology model: Application to Thao river watershed
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Reconstruction and evaluation of changes in hydrologic conditions over a transboundary region by a regional climate model coupled with a physically-based hydrology model: Application to Thao river watershed

机译：区域气候模型与基于物理的水文模型相结合的跨界区域水文条件变化的重建和评估：在邵江流域的应用

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摘要

The differences among countries in terms of physical features, governmental policies, priorities in short-and long-term water resources management may lead to conflicts in managing and sharing of water resources over the transboundary regions. Due to no formal data sharing agreement between countries, there has been usually no data availability at transboundary regions. In this study, a methodology, in which a physically-based hydrology model was coupled with a regional climate model, is proposed to reconstruct and evaluate hydrologic conditions over transboundary regions. For the case study, Thao river watershed (TRW), within Vietnam and China, was selected. The Watershed Environmental Hydrology (WEHY) model was implemented based on topography, soil, and land use/cover information which was retrieved from global satellite data resources. The watershed model-WEHY was first validated over the TRW, and then was used to reconstruct historical hydrologic conditions during 1950-2007. The results of this study suggest no significant trend in the annual streamflow over the target watershed. In addition, there is a time shift in the wet season between the upstream sector in China and the downstream sector in Vietnam over the TRW. The annual flow contribution from the upstream sector in China to the outlet of TRW is estimated to be around 66%, and the remaining 34% contribution comes from the downstream sector in Vietnam territory. Last but not the least, the annual flow as a function of return period varies not only with the return period but also as a function of the time window, reflecting the effect of the changing regime on the streamflows at the TRW. The evolution of the flow frequency through time is an evidence of the ongoing non-stationarity in the hydrologic conditions over TRW. (C) 2019 Elsevier B.V. All rights reserved.
机译：各国之间在自然特征，政府政策，短期和长期水资源管理的优先重点方面的差异可能导致跨界地区水资源管理和共享方面的冲突。由于国家之间没有正式的数据共享协议，因此跨界地区通常没有数据可用。在这项研究中，提出了一种基于物理的水文学模型与区域气候模型相结合的方法，以重建和评估跨界地区的水文条件。在案例研究中，选择了越南和中国境内的邵河流域（TRW）。流域环境水文学（WEHY）模型是基于地形，土壤以及从全球卫星数据资源中检索到的土地使用/覆盖信息而实现的。分水岭模型-WEHY首先在TRW上进行了验证，然后用于重建1950-2007年的历史水文条件。这项研究的结果表明，目标流域的年流量没有明显趋势。此外，TRW期间，中国上游部门和越南下游部门之间的雨季会有时间变化。从中国上游部门到TRW出口的年流量贡献估计约为66％，其余34％的贡献来自越南领土的下游部门。最后但并非最不重要的一点是，年流量作为回报周期的函数不仅随回报周期而变化，而且还随时间窗口变化，反映了变化的制度对TRW流量的影响。流量随时间的变化是TRW上水文条件持续不平稳的证据。 （C）2019 Elsevier B.V.保留所有权利。

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