基金委项目
国家自然科学基金重大研究计划重点支持项目“耦合多元示踪和水文模型的高寒流域径流水源解析研究”/ Water Source Apportionment for High Mountainous Watersheds by Integrating Multiple Tracers and Distributed Hydrological Model
发表时间:2017

项目名称:耦合多元示踪和水文模型的高寒流域径流水源解析研究

English Name:Water Source Apportionment for High Mountainous Watersheds by Integrating Multiple Tracers and Distributed Hydrological Model

关键词:同位素示踪;水文模型;融水径流;降雨径流;冰川融化

Key word:isotopic tracing; hydrological model; melting runoff; rainfall runoff; glacier melting

执行年限/Time: 2017.01-2020.12

摘要:西南河流源区为高寒流域,其径流由融冰、融雪和降雨等多种水源组成,对气候变化的响应规律复杂。为科学开展变化条件下径流的适应性利用,需要准确解析高寒流域的径流水源。本申请以雅鲁藏布江流域为对象,在典型流域开展寒区水文和同位素地球化学综合观测实验;揭示不同条件下冰雪消融过程机理,发展具有较强物理机制的冰雪消融模型;揭示高寒流域主要水文过程中氢氧稳定同位素的分馏过程,建立相应的分馏模型;综合消融模型和分馏模型,耦合同位素迁移转化过程和水分运动过程,构建高寒流域分布式同位素水文模型及参数诊断方法;基于微量元素和非传统同位素探索适用于高寒流域径流水源解析的新示踪物质和新模型方法。本申请在水文学前沿问题上进行探讨,属于水文学和地球化学的交叉研究,有望创新水文模拟理论和水源解析方法,为重大研究计划的“径流演变规律及预测:高原寒区径流不同成分的解析理论和方法”研究目标提供支撑,具有重要的理论意义和实践价值。

Abstract:In headwaters of high mountainous regions, streamflow originates from multi-sources, i.e. ice melting, snow melting, and rainfall. The runoff response to climate changes is considerably complicate. In order to manage the changing runoff in a sustainable and adaptive manner, deep understandings of water source apportionment in these cold-region basins are of great importance. The Yarlungzangbo-Brahmaputra river basin is taken as a case basin in this project, and comprehensive observations on hydrological and isotopic geochemical processes will be conducted in typical sub-catchments. Specifically, this study is obligated to reveal mechanisms of ice/snow melting, and to develop physically robust mathematic models on melting processes. Meanwhile, fractionations of stable isotopes such as hydrogen and oxygen during hydrological processes will also be studied, and the fractionation models will be developed. A distributed hydrological model coupling isotope transport and water transport will be developed, by integrating the above mentioned models on ice/snow melting and isotope fractionation. Consequently, based on the trace elements and the non-traditional isotopes, novel tracers and models will be explored for water source apportioning in cold-regions. This project is an advancement on the frontier of hydrological studies, and is an interdisciplinary research on hydrology and geochemistry. It is promising to develop novel theories and methods on hydrological modeling and water source apportioning.

 
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