CHARACTERIZATION AND CAUSATION OF RUNOFF AND SEDIMENT VARIATION IN THE JIALINGJIANG RIVER BASIN  

作　　者：Quanxi XU Songsheng CHEN Ming XIONG Shengwei LI Zefang CHEN 

机构地区：[1]Senior engineer, Bureau of Hydrology, Changjiang Water Resources Commission（CWRC）, Wuhan 430010, China, [2]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, wuhan, China, 430072. [3]Prof., Bureau of Hydrology, CWRC, Wuhan, China 430010. [4]Engineer, Bureau of Hydrology, CWRC, Wuhan, China 430010.

出　　处：《International Journal of Sediment Research》2007年第3期228-237,共10页国际泥沙研究（英文版）

基　　金：National Basic Research Program of China (No. 2003CB415200).

摘　　要：The Jialingjiang River basin is one of the main sediment contributing areas in the upper reaches of the Changjiang River. Great changes have taken place in the runoff and sediment discharge in recent years. Comparing the data of 1991-2003 with the data of 1954-1990, the annual runoff of the Jialingjiang River basin decreased by 23 %, and the suspended sediment transport decreased by 74% or 105 million tons. The main factors affecting the reduction include a decrease in rainfall, sediment detention of hydraulic structures, soil and water conservation activities, sedimentation and sand dredging in the river channel. Thorough investigation and analysis of the contribution of each factor to the sediment decrease at Beibei Station was determined for the first time. The following are the contributing percentages for each factor： a decrease in runoff accounted for 32.9%; soil and water conservation measures accounted for 16.4%; sediment detention of hydraulic structures accounted for 30.5%; sedimentation, river channel sand dredging, and other factors accounted for 20.2%. These findings are very important for forecasting the trend of inflow sediment discharge variation.The Jialingjiang River basin is one of the main sediment contributing areas in the upper reaches of the Changjiang River. Great changes have taken place in the runoff and sediment discharge in recent years. Comparing the data of 1991-2003 with the data of 1954-1990, the annual runoff of the Jialingjiang River basin decreased by 23 %, and the suspended sediment transport decreased by 74% or 105 million tons. The main factors affecting the reduction include a decrease in rainfall, sediment detention of hydraulic structures, soil and water conservation activities, sedimentation and sand dredging in the river channel. Thorough investigation and analysis of the contribution of each factor to the sediment decrease at Beibei Station was determined for the first time. The following are the contributing percentages for each factor： a decrease in runoff accounted for 32.9%; soil and water conservation measures accounted for 16.4%; sediment detention of hydraulic structures accounted for 30.5%; sedimentation, river channel sand dredging, and other factors accounted for 20.2%. These findings are very important for forecasting the trend of inflow sediment discharge variation.

关 键 词：Jialingjiang River basin Variation in characteristic of runoff and sediment Quantitative analysis on contribution of influence factors 

分 类 号：TV152[水利工程—水力学及河流动力学]