城市河道渠化方案探讨——以兰州市黄河段为例

Study on Training Scheme of Channel Width at Lanzhou Reach of the Yellow River

以兰州市为例研究黄河兰州段河道渠化整治方案与泄洪等的关系。在对河道地形、河相关系、造床流量及河床演变规律分析的基础上 ,提出了切实可行的整治宽度 2 40m、泄洪宽度 30 0m及相关建议 ,并进行了物理模型试验和数值计算 ,实验与计算基本吻合。该方案的实施不但可满足泄洪的要求而且并未引起水位、流速及河床断面地形较大幅度的变化。

In accordance with the relationship between flood discharge and the regulation of Lanzhou reach of the Yellow River, based on the analysis of such factors as the topography of the river valley, river regime, bed forming discharge and river bed changes and so on, the scheme of the feasible minimum channel width (300m) of the river training for floods discharging was put forward through experimental study on the model. The model experiment results show that the changes of river configuration are not remarkable and the river training works are suitable for the large floods. Mathematical model is applied to simulate the flood flows. Good economic, social and environmental benefits will be obtained if this plan is put into effect.