基线假设是否会改变绿色雨水基础设施的有效性,以减少综合下水道溢出?
Mayra Rodriguez1, Giovan Battista Cavadini2, Lauren M Cook1
1Department of Urban Water Management, Swiss Federal Institute for Aquatic Research, Dübendorf, Switzerland.
Water research
|February 17, 2024
概括
简化的水文模型可以不准确地估计绿色雨水基础设施 (GSI) 减少综合下水道溢出 (CSO) 的有效性. 包括蒸发和地下水等过程对于准确的GSI规划至关重要.
科学领域:
- 环境工程 环境工程
- 水文学的水文学
- 城市水资源管理
背景情况:
- 绿色雨水基础设施 (GSI) 越来越多地被采用来缓解综合下水道溢出 (CSO).
- 水文模拟模型对于评估GSI性能至关重要,但通常使用简化方法.
- 忽视复杂的水文过程 (蒸发,地下水) 对CSO和GSI估计的影响尚不清楚.
研究的目的:
- 评估忽视特定的水流和水文过程如何影响综合下水道溢流 (CSO) 的估计.
- 评估这些建模假设对不同类型绿色雨水基础设施 (GSI) 估计有效性的影响.
- 为GSI规划中的水文建模提供最佳实践指导.
主要方法:
- 一个现有的瑞士综合下水道系统的EPA SWMM模型被修改为包含蒸发透气 (ET),地下水 (GW) 和上游流入.
- 该模型运行时使用了30年的历史降雨数据.
- 模拟中使用和不使用三个GSI类型进行了模拟:生物防护盆地,透路面和绿色屋顶.
主要成果:
- 在水文模型中忽略某些流量可能会导致CSO体积的显著变化,从-15%到40%不等.
- GSI的有效性差异很大,基于GSI类型和模拟的流程,模拟的CSO量减少幅度有8%至35%的差异.
- 地下水的代表性对于透GSI至关重要,因为忽视它可能导致低估CSO数量,甚至由于GW水平上升而导致特定分捕获量的增加.
结论:
- 简化的水文模型可以产生误导性的CSO量和GSI有效性的估计.
- 准确的GSI规划需要将所有相关的水文过程,包括ET和GW纳入模拟模型.
- 在使用模拟结果用于GSI决策时,必须仔细考虑模型假设和不确定性.
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