荆江河段水沙条件与主流线特征关系研究

基金项目:

国家自然科学基金

详细信息

Relationship between flow and sediment regime and changes of main streamline in Jingjiang reach

摘要: 荆江河段的主流变化主要表现为弯曲分汊段的主支汉交替及单一弯道段深泓半径的变化,综合考虑两者关系,提出了能描述荆江分汉段及单一弯道段主流线特点的无量纲常数--弯曲特征数r,并针对同一河段分析了汛期平均流量、洪峰变差系数、年输沙量及输沙指数等水沙条件变化与主流线变化的对应关系.结果表明:汛期平均流量较小、水流相对饱和度低、来水来沙过程较为均匀使得滩槽高差较小,横断面向宽浅发展,从而减弱河道对水流的约束,弯曲特征数较小,主流顺直;反之主流向弯曲发展.
- 河床演变 /
- 水沙条件 /
- 水流动力轴线 /
- 荆江河段
Abstract: The main streamline of Jingjiang reach changes in the form of alternation of main & tributary branches and radius of thalweg in bends.To describe the characteristics of mainstream line in bifurcated and curved reaches,this paper presents a dimensionless coefficient: sinuosity eigenvalue r.Correlation between r and other eigenvalues(such as dispersion of flood flow,sediment transport index,etc.) obtained by hydrological statistics reveals that less of average flood,uniformity of flow and incoming sediment wi...
- fluvial process /
- flow and sediment regime /
- main streamline /
- Jingjiang reach