Page - 327 - in Book of Full Papers - Symposium Hydro Engineering

COMMISSION INTERNATIONALE DES GRANDS BARRAGES ------- VINGT-SIXIÈME CONGRÈS DES GRANDS BARRAGES Autriche, juillet 2018 ------- RUNOFF AND SEDIMENT TRANSPORTATION IN UPPER AND MIDDLE REACHES OF JINSHA RIVER Yan XIA, Zhou YINJUN, Jin ZHONGWU CHANGJIANG RIVER SCIENTIFIC RESEARCH INSTITUTE, WUHAN CHINA EXTENDED ABSTRACT Jinsha river is the lower stretch of the source region of the Yangtze river, whose runoff mostly delay on the melting of glaciers, and is greatly affected by climate change. Otherwise the hydropower resources is rich in Jinsha basin, and since the Jin Anqiao Hydropower Station has been built in December 2010, several reservoirs have impounded successively. A reservoir group has been formed in middle reach of Jinsha river basin, which plays a huge role in intercepting sediment. Through statistical analysis of water and sediment data of Zhimenda, Shigu and Panzhihua hydrologic stations in the upper and middle reach of Jinsha river basin, this paper presents the sediment transport characteristics of the reach, including the sediment sources and distribution, the annual variation and annual distribution of sediment load. Then, the method of multiple regression analysis was used to evaluate the sediment trap amount of the reservoir group in the middle stretch. The calculated results showed that, during year 2001 to 2016, the annual average runoff amount of the Zhimenda station has increased about 24.24% than that of year 1957 to 2000, but the runoff of Shigu and Panzhihua stations haven’t changed much. Compared to the annual average sediment discharge of year before 2000, during year 2001 to 2010, the three stations have increased 6.97%, 28.94%,4.75%,respectively; during year 2011 to 2016, the Zhimenda and Shigu station both increased about 11%，however, the Panzhihua Station decreased 327