水沙变化情势下金沙江下游卵石推移质输移规律  

Laws of pebble bed load transport under flow and sediment variation in the lower reaches of Jinsha River

作　　者：冯志毅 邓安军[1,2] 秦蕾蕾 吕瑞茹 FENC Zhi-yi;ENG Anjun;QIN Lei-lei;LYU Rui-ru(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Key Laboratory of Sediment Science and Northern River Training,Ministry of Water Resources,China Institute of Water Resources and Hydropower Research,Bejing 100048,China;China Three Gorges Construction Engineering Corporation,Chengdu 610041,China)

机构地区：[1]中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京100048 [2]中国水利水电科学研究院水利部泥沙科学与北方河流治理重点实验室,北京100048 [3]中国三峡建工(集团)有限公司,四川成都610041

出　　处：《泥沙研究》2023年第4期38-44,共7页Journal of Sediment Research

基　　金：国家自然科学基金项目(U2040217);水利部泥沙科学与北方河流治理重点实验室开放研究基金项目(IWHR-JH-2020-A-05)。

摘　　要：基于三堆子水文站历年水文泥沙和卵石推移质实测资料,分析了金沙江下游水沙情势的变化及卵石推移质输移规律。分析结果表明,金沙江上中游梯级水电站运行后造成了下游径流及泥沙年内过程的重新分配,水库拦洪削峰导致较大流量出现的概率减小,径流量变化不大,输沙量显著减少。金沙江下游卵石推移质输沙率与流量的高次方成正比,水沙变化情势下卵石推移质输沙量显著减少,不同流量的卵石推移质输沙率减小。卵石推移质级配随着流量的增大而变粗,水沙变化条件下卵石推移质级配发生了明显粗化。Based on measured water and sediment and pebble bed load data at Sanduizi Hydrological Station,the laws of sediment transport of pebble bed load are analyzed under the variation of water and sediment in the lower reaches of Jinsha River.The result shows that the flow process redistribution and sediment redistribution caused by the impoundment of cascade reservoirs in the lower reaches of Jinsha River are obvious,and the flood arrest and peak-cutting effect also reduces the frequency of large discharge,which causes the reduction of sediment transport,but the change of flow is not significant.The sediment transport rate of pebble bed load in the lower reaches of Jinsha River is proportional to the higher power of flow,the variation of water and sediment results in the significant reduction of pebble bed load transport,and also makes the transport rate decrease under different flow.The gradation of pebble bed load becomes coarse with the increase of flow,and shows an obvious trend of becoming coarse under the variation of water and sediment condition.

关 键 词：金沙江下游 水沙条件变化 卵石推移质 推移质级配 

分 类 号：TV142.2[水利工程—水力学及河流动力学]