Arcmap和HEC-RAS在南海子蓄滞洪区优化调度中的应用

The application of Arcmap and HEC-RAS in optimizing the operation of Nanhaizi flood detention basin

摘要

南海子蓄滞洪区是北运河流域防洪体系的重要组成部分，为探究其现状滞洪库容、洪水演进过程，为优化调度提供支撑，根据最新实测高精度地形图，采用Arcmap复核南海子蓄滞洪区现状滞洪库容，并基于HEC-RAS建立二维水动力模型进行洪水演进分析，明确设计调度方案。结果表明，南海子蓄滞洪区现状滞洪库容为230万m³,比50 a一遇规划蓄洪量260万m³少30万m³,将麋鹿苑作为蓄滞洪区的一部分可最优地解决这一问题，并明确当南海子公园湖区水位达到29.75 m时，打开新建连通渠节制闸，开始向麋鹿苑分洪，当麋鹿苑水位达到29.65 m时，关闭连通渠节制闸。为了保证工程的稳定性，根据模拟结果，确定新建连通渠及节制闸宽度为5 m。根据各区域滞洪水位的对比，相较于水位~库容曲线，基于HEC-RAS的二维水动力模型能够考虑水体的流动方向和水头损失，更好地模拟实际水体的流动。

Abstract

Nanhaizi flood detention basin is an important component of North Canal basin flood control system. To provide support for its optimal operation, the current storage capacity of Nanhaizi flood detention basin was analyzed firstly based on Arcmap, and a two-dimensional hydrodynamic model was established based on HEC-RAS. The results showed that the current storage capacity of Nanhaizi flood detention basin was 2 300 000 m³, which was 300 000 m³ less than the planned storage capacity of 2 600 000 m³ in 50 years. Taking the elk park as a part of the flood detention basin can solve this problem optimally, and it was determined that the new regulating gate was opened when the water surface elevation of the lake reaches 29.75 m, while closed when the water surface elevation of the elk park reaches 29.75 m. In order to ensure the stability of the project, the width of the new connecting channel and regulating gate was determined to be 5 m according to the simulation result. Compared with the curve of water surface elevation to storage, the two-dimensional hydrodynamic model based on HEC-RAS can consider the flow direction and head loss of the water and simulate the actual flow better according to the result.

关键词

Arcmap / HEC-RAS / 蓄滞洪区 / 优化调度

Key words

Arcmap / HEC-RAS / flood detention basin / optimal operation

Author summay

王 盼(1997—), 女, 助理工程师, 硕士, 主要从事工程水文学研究。E-mail: [e-mail]