The relationship between extreme precipitation and extreme streamflow at the Nuxia Hydrological Station in the Yarlung Zangbo River basin
Climate change has the potential to alter the global water cycle,resulting in an uneven spatial and tem-poral distribution of water resources. Furthermore,climate change can result in an increased frequency of meteo-rological and hydrological disasters. The Qinghai-Xizang Plateau is the most unique geological-geographical-ecological-resource-climatic unit on the Earth,known as "Asia Water Tower" and "The Third Pole". It is the source of more than ten major rivers in Asia and is known as the "Water Tower of Asia". With the intensifica-tion of global warming,extreme hydrological and meteorological events become more frequent on the Qinghai-Xizang Plateau. However,the complex climate and underlying surface characteristics,including glaciers,snow cover,and permafrost,limit our understanding of the response of extreme runoff to extreme precipitation in this region. Against this background,this study taking the Yarlung Zangbo River basin in the southern part of the Qinghai-Xizang Plateau as an example,this study,based on daily precipitation and runoff data,improves the method of identifying extreme streamflow and utilizes correlation analysis to investigate the relationship between extreme streamflow and extreme precipitation at different probabilities. The results indicate that extreme stream-flow typically last 1～2 days in the Yarlung Zangbo River basin,and as the probability decreases,the duration of events correspondingly shortens. Extreme streamflow events with probabilities of 10％,5％,and 1％ exhibit co-efficients ranged from 0.07 to 0.28 (P<0.01) with extreme precipitation,and the relationship strengthens with increasing probability of extreme precipitation. At the Nuxia Hydrological Station,the response intensity of ex-treme streamflow to extreme precipitation in the upper stream of Nuxia Hydrological Station is greater than that at the Nuxia and Linzhi Meteorological Station,with a lag of one day. Additionally,the response of extreme streamflow to extreme precipitation is also influenced by moisture content,vegetation conditions,and soil mois-ture changes in the Yarlung Zangbo River basin. The improved methods of identifying extreme streamflow in this paper can effectively capture the extreme streamflow events influenced by extreme precipitation in the Yar-lung Zangbo River basin,and improve the understanding of the relationship between extreme streamflow and ex-treme precipitation response in high-altitude basins with complex streamflow sources. At the same time,this pa-per offers significant theoretical support and scientific guidance for the management of water resources and the re-gional economic development of the Yarlung Zangbo River basin in the context of climate change.
extreme precipitationextreme streamflowmethods of identifying extreme streamflowYarlung Zangbo River basin
万方数据
维普
