English Name：Water Source Apportionment for High Mountainous Watersheds by Integrating Multiple Tracers and Distributed Hydrological Model
Key word：isotopic tracing; hydrological model; melting runoff; rainfall runoff; glacier melting
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.