城市河涌受下垫面硬化影响,暴雨产汇流过程复杂,传统设计洪水计算方法(综合单位线和推理公式法)难以精确模拟。本文以惠州望江沥河涌为例,基于SCS水文模型计算了城市河涌设计洪水,并与传统设计方法进行对比分析,研究结果表明:随着城市用地面积增加,望江沥河涌洪峰流量相应增加,呈现明显正相关;SCS模型计算设计洪水成果相对传统方法(综合单位线法及推理公式法)大20%,这主要是由于SCS模型充分考虑了下垫面变化,汇流较快,洪峰流量较大,传统设计洪水计算方法在推求城市下垫面流域设计洪水存在流量偏小现象。SCS模型充分考虑流域下垫面变化的因素,产汇流计算更加合理。本研究为无径流观测资料城市河涌设计洪水计算提供了新思路,可供城市河涌防洪排涝规划设计参考。
Abstract
It is difficult to simulate the design flood accurately by traditional calculation methods ( synthetic unit hydrograph and rational method) as the complex hydrological process of rainstorm caused by the underlying surface hardening in urban areas. Taking the Wangjiangli River in Huizhou as an example,this paper calculates the design flood of urban streams based on the SCS hydrological model and compared with the traditional methods. Results show that the peak discharge of the Wangjiangli River has a significant positive correlation with urban land area. The design flood calculated by SCS model is 20% larger than traditional methods because the model has considered the underlying
surface change thoroughly and the confluence become faster and the peak discharge was larger. The calculation results of the SCS model is more reasonable due to the consideration of underlying surface change. This study can be used as reference for the design flood calculation of urban river without observed data.
关键词
SCS水文模型 /
城市河涌 /
设计洪水 /
下垫面变化
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Key words
SCS hydrological model /
urban stream /
design flood /
underlying surface change
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基金
广东省水利科技创新项目资助( 2017-13,2016-11)
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参考文献
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