南水北调中线跨河工程的泥沙问题研究

Study on sediment of river-crossing works:Mid-route of South-to-North Water Transfer Project

河流泥沙及河床变形问题直接关系到跨河建筑物的安全性.南水北调中线工程总干渠要跨越的河流众多,河流的河床组成、河道比降、河流宽度、行洪流量差异极大,而且河道冲刷对跨河工程的影响方式和影响程度也各不相同;同样,不同规模、型式、布置结构的跨河工程修建后对天然河道的影响也不同.分析计算各种影响的程度是跨河工程设计的依据.

The problems of river bed deformation and sediment are directly related to the safety of river-crossing works.The rivers with different structures of river bed,channel gradients,channel widths and flood discharges to be crossed by the main water transfer channel of the Mid-route of South-to-North Water Transfer Project are many. Furthermore, the impacts from the channel scours on the crossing works are various as well. However, the impacts from the crossing works with different scales, types and structures on the rivers are various as well. The analyses and calculations made on various impacts are just the bases for the design of the river-crossing works.