Variation of Runoff and Runoff Components of the Lhasa River Basin in the Qinghai-Tibet Plateau under Climate Change

Quantitative analysis of changes in Lhasa River runoff components was significant to local water resources management. This study constructed the spatial processes hydrology (SPHY) model Basin and optimized model’s parameters using hydrograph partitioning curves (HPC) method. The Basin’s precipitation temperature were forecasted for 2020 2100 statistical downscaling (SDSM) two scenarios from fifth generation Canadian earth system (CanESM5) dataset, shared socioeconomic pathways 1-2.6 (SSP1-2.6) 2-4.5 (SSP2-4.5). analyzed potential based on future climate. results showed that 2010 2019 composed snowmelt runoff, glacier melt rainfall baseflow, with proportions 15.57, 6.19, 49.98, 28.26%, respectively. From 2100, under SSP1-2.6 scenario, average increased by 0.76mm 0.08 °C per decade. Under SSP2-4.5 increasing rate 3.57 mm 0.25 Due increase, a decreasing trend. decline total 0.31 m3/s year scenario due decrease baseflow. clear trend at an 1.13 1.16 year, respectively, related increase precipitation. These conclusions suggested climate change significantly impacted River’s components.