黄河干流河道输水量与输沙量关系研究

Study on relationship between water flow and suspended-sediment discharge in the main channel of Yellow River

在系统回顾已有河道输水输沙特性研究成果的基础上,从张瑞瑾水流挟沙力公式入手,引入来流含沙量的概念,推导出河道输水量与输沙量关系式。采用实测资料分析,分别得到了黄河干流河道兰州至利津站不同河段的输水量与输沙量关系式,各式的相关关系均较好。黄河干流各河段输水量与输沙量关系特点的分析表明:兰州-石嘴山和潼关-利津河段的该种关系受大型水利枢纽运行影响较大,石嘴山-头道拐与头道拐-潼关河段的该种关系分别受比降变化和支流入汇影响较大;随着来流含沙量的增大,自动调整作用使各河段的该种关系中输水量对输沙量的影响逐渐减小。

Based on the comprehensive review of the existing research on water and sediment transport characteristics, a formula expressing the relationship between water flow and suspended-sediment discharge were derived from ZHANG Rui-jin stream sediment carrying capacity formula by introducing the concept of suspended load concenteation of inflow. Water flow and suspended-sediment discharge relational expressions with good interrelationships of different reaches of the main channel in Yellow River from Lanzhou to Lijin were induced by carrying out multivariate regressions of the observed data. Analyses of the relations charac- teristics show that water flow and suspended-sediment discharge relations of Lanzhou-Shizuishan and Tong- guan-Lijin reaches were affected by the running of big hydro-junctions, while those of Shizuishan-Toud- aoguai and Toudaoguai-Tongguan reaches were resulted from the change of slop and the incoming of branch- es respectively, and the contributions to suspended-sediment discharge by water flow become less with the increase of suspended load concentration of inflow due to the self-adjusting function of the reaches.