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本文介绍了HEC-RAS模型计算闸坝壅水的基本原理和主要步骤,并以云南省临沧市孟定镇段的南汀河干流的壅水计算为实例,采用HEC-RAS模型,模拟了30年一遇、多年平均洪峰流量、平均年的设计洪水频率下,建坝前后的河道水面线,进而求得坝前壅水高度和上游影响范围。计算结果表明,HEC-RAS模型在分析计算闸坝对河道的阻水壅高影响时方便实用,工程适用性较好,可供防洪工程决策制定的参考。
In this paper, the basic principles and main steps of HEC-RAS model for calculating sluice sluice water are introduced. Taking sluice water calculation of Nanting River main stream in Mengding Town, Lincang City, Yunnan Province as an example, HEC-RAS model is used to simulate In 30 years, the annual average peak flow, the average annual design flood frequency, before and after the construction of the river surface water line, and then find the dam height and the upper reaches of the impact of the water area. The calculation results show that the HEC-RAS model is convenient and practical in analyzing and calculating the influence of sluice dam on the water-blocking effect of the riverway, and has good engineering applicability and can be used as a reference for flood control project decision-making.