关键词: 水沙情势; 径流量; 输沙量; 水库建设; 水沙过程线法; 距平累积法; 赣江流域;

Abstract: The Ganjiang River is the largest tributary of the Poyang Lake Basin with the largest area and the largest amount of sediment transport.Variations of the runoff and sediment in Ganjiang River have an significant effect on the runoff and sediment entering the Poyang Lake.In order to study effect of reservoir construction on the runoff and sediment characteristics in the Ganjiang River Basin, the runoff and sediment process line method, anomaly accumulation method and double accumulation curve method were used to quantitatively analyze the runoff(from 1953 to 2017)and sediment(from 1956 to 2017)characteristics of Bashang station, Ji'an station and Waizhou station.The results showed that:(1) from 1953 to 2018,132 large and medium-sized reservoirs have been built in the Ganjiang River Basin, with a cumulative total storage capacity of approximately 9.459 billion m3.In recent years, construction process of reservoirs in the river basin has accelerated significantly, the numbers of reservoirs and total storage capacity have increased.(2) The runoff and sediment of 3 main control hydrologic stations have little change within the year, while interannual changes of the runoff and sediment were significant.There was no significant change in annual runoff series in general, it showed an upward and downward fluctuation trend.The sediment discharge showed increasing first and then decreasing trend, which was more significant after 1990.(3) Slope of the double-cumulative curve changed significantly because of the construction of large-scale reservoirs and water and soil conservation projects, indicating that the changes in runoff and sediment characteristics in the Ganjiang River Basin were closely related to the construction of the reservoir.

Key words: runoff and sediment characteristics; runoff; sediment transport; reservoir construction; runoff and sediment process line method; anomaly accumulation method; GanJiang River Basin;