金沙江流域大型梯级水库对水沙变化的影响

doi:10.16843/j.sswc.2019.05.005

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Abstract [Background] The Jinsha River is an important basin in the upper reaches of the Yangtze River. In recent years, many cascade reservoirs have been built in the basin, but the effects of these reservoirs on the variation of runoff and sediment load are not very clear. This study aims to explore the temporal and spatial variation characteristics of runoff and sediment load in study area.[Methods] The data of runoff and sediment load from year 1965 to 2016, and the data of reservoir erosion and siltation in recent years measured by China Three Gorges Corporation, and combined with the method of Mann-Kendall trend test, etc., were applied to analyze the characteristics of runoff and sediment load.[Results] The output of runoff and sediment load in the upper and middle reaches of Jinsha River Vasin was on the rising tendency, after 1998, its annual runoff and sediment increased by 15.27% and 5.01% respectively, indicating that soil and water conservation in these areas needed to be strengthened. The section between Panzhihua and Baihetan (excluding the Yalong River) was the main sediment producing area on the Jinsha River basin, its sediment output accounted for 36.40% of total, and thus this area was the core area when considering sediment load control. Sediment output in the downstream was obviously reduced, its annual sediment decreased by 38.55% after 1998, which was mainly attributed to the construction of the 4 giant cascade reservoirs, meanwhile, the soil and water conservation projects also produced a certain sediment reduction effect.[Conclusions] Our results show that the spatial and spatial and temporal variation variation of runoff and sediment load in Jinsha River Basin are complicated, and the contribution of large cascade reservoirs to the reduction of sediment transport of Jinsha River is over 95%.

Key words： cascade reservoir runoff and sediment load variation river scouring and silting Jinsha River

Received: 24 May 2018

PACS:

S157.1

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	LU Chuanhao
	DONG Xianyong
	TANG Jialiang
	LIU Gangcai

Cite this article:

LU Chuanhao,DONG Xianyong,TANG Jialiang, et al. Impacts of large cascade reservoirs on runoff and sediment load variations in Jinsha River Basin[J]. SSWC, 2019, 17(5): 36-43.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.05.005 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I5/36

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