摘要
滩槽复式河道是冲积河流中最为常见的一种形态,也是河流动力学研究最为重要的内容之一。以复式河道概化试验数据和水沙运动的区域性特征为依据,在提出滩槽复式断面主槽平衡区、滩槽交互区、滩地平衡区以及边壁区4个分区的基础上,将水流流态最为复杂的滩槽交互区进一步划分为对数流速区(内区)和非对数流速区(外区),通过引入描写动植物生长过程的S型曲线,提出了内外区分界线的确定方法。以滩槽交互区横向分布公式为基础,通过线性假定和积分变换,给出了滩槽交互区内断面平均流速和含沙量的计算公式,并对不同分区内的流速和含沙量的差异性进行了比较分析。
Trough-based compound channels are not only the most common morphology of alluvial rivers, they are also the most important content of river dynamics research. In this paper, based on the generalization experimental data of compound channel and regional characteristics of water-sediment movement, and in combination with four re- gions of trough-based compound sections, i. e. the main channel equilibrium region, trough interactive region, flood- plain equilibrium region and side wall region, the trough interactive region with the most complicated river flow mor- phology is further divided into two parts, i. e. the logarithmic velocity zone （inner zone） and non-logarithmic velocity zone （external zone）. The S-shaped curve describing the animal and plant growth process is introduced so as to pro- pose the determination method of the inner-external zone boundary. Based on the lateral distributional formula of the trough interactive region through linear assumption and integral transform, the calculation equations of sectional aver- age velocity and sediment content in the trough interactive region are given in order to perform comparative analysis on the differences in the velocity and sediment content in different regions. In this paper, the proposed trough region boundary and calculation method of water-sediment distribution will provide technical support for trough planning and governing of compound channels.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2017年第3期321-328,共8页
Advances in Water Science
基金
水利部公益性行业科研专项经费资助项目(201401002)
黑龙江省应用技术研究与开发计划项目(GZ16B011)~~
关键词
水沙运动
复式河道
主槽
滩地
水流流速
含沙量
flow and sediment movement
compound channels
main channel
flood plain
flow velocity
sediment concentration
