畸形河势对河道排洪能力的影响及对策

Influence of Irregular Channel Regime to the Flood Discharge Capability of Channel and Countermeasures

以黄河下游的畸形河湾为例,阐述了畸形河势对河道排洪能力的影响。分析表明:①畸形河湾造成的弯曲河势的存在是短期内局部河段排洪能力降低的重要原因,必须予以高度重视;②施行裁弯可消除畸形河湾的不利河势,迅速提高河道排洪能力;③在河道整治中,规划流路过分弯曲对河道排洪能力的不利影响需要引起足够重视,在某些河势一直难以得到控制的河段,采用双岸整治的河道整治方法是从根本上消除不利河势再度发生的有效措施。

The paper elaborates the influence of irregular channel regime to the capability of flood discharge through taking irregular winding bend of the lower Yellow River as an example.The analysis shows that a) the existence of winding river regime caused by irregular winding bend is a key reason for reducing the capability of flood discharge at local section in a short time and should be paid attention to;b) channel rectification can eliminate disadvantage river regime and quickly increase the capability of flood discharge and;c) during the river training,it should pay great attention to the unfavorable effects caused by planned excessive bending and adopt the method of river training at both sides of the banks which is an effective measure to control the unfavorable river regime happening again for the river section where the river regime is difficult to control.