Abstract: In order to analyze the flood discharge capacity of Douhe River in section of Tangshan City after comprehensive improvement,this paper utilizes the measured data of transverse and longitudinal section in Douhe River of Tangshan section,and adopts the calculation formula of steady non-uniform flow in natural river to calculate the flood discharge capacity.Then it recons the flood level of the sections with different flood discharge capacity,finds out the water-blocking reach and section affecting flood discharge,and offers the measures and suggestions for promoting the capacity of flood.

Key words: flood discharge capacity, water surface curve, Manning Formula, dike, safety flood level

摘要： 为了分析陡河唐山市区段综合整治后的行洪能力,文中利用陡河唐山市区段河道横纵断面实测数据,采用天然河道恒定非均匀流计算公式对该河段行洪能力进行了计算,并推求出各断面不同行洪能力下的洪水水位,找出影响河道行洪的阻水河段及阻水断面,给出提高河道行洪能力的措施与建议。

关键词: 行洪能力, 水面曲线, 曼宁公式, 堤防, 安全行洪水位