Analysis of the reduction effect of source emission reduction measures on municipal stormwater discharges——a case study of semi-arid cities in Northern China
源头减排措施对于市政雨水排放的削减效果分析——以北方半干旱城市为例

摘要

在海绵城市建设中，源头减排措施可以有效地削减径流量以及径流污染，对于城市雨水排放起到了错峰缓释的作用。本文以北方半干旱城市为例，采用经验公式计算并结合SWMM模型模拟辅助验证的方式，研究并计算了源头减排措施对于雨水排放的削减比例。通过计算，源头减排措施在不同重现期降雨情况下对于雨水排放的削减比例不同。在年径流总量控制率85%的改造强度时，在1年一遇、2年一遇、3年一遇、5年一遇、10年一遇重现期降雨情景下，雨水流量削减比例分别为82%~83.8%、63.5%~65.6%、56.2%~58.3%、49.2%~51.1%、41.4%~43.9%。本研究所形成的源头减排对于市政雨水排放的削减比例可为北方半干旱城市雨水排放方案优化提供参考，在城市规划设计时采用经济、合理、高效的改造措施。

Abstract

In sponge city construction, runoff reduction measures can effectively reduce runoff volume and runoff pollution, and play a role of peak mitigation for urban stormwater discharge. In this paper, the reduction ratio of runoff reduction measures to stormwater discharge is calculated using empirical formulae and SWMM model to assist verification in semi-arid cities in the north as an example. The calculation shows that the reduction ratio of source emission reduction measures for stormwater discharge is different under different rainfall scenarios in different recurrence periods. At a volume capture ratio of annual rainfall of 85%, the reduction percentages of stormwater flow under the 1-year, 2-year, 3-year, 5-year, and 10-year return period rainfall scenarios were 82% to 83.8%, 63.5% to 65.6%, 56.2% to 58.3%, 49.2% to 51.1%, and 41.4% to 43.9%, respectively. The reduction ratios of runoff reduction for municipal stormwater discharges developed in this study can provide a reference for the optimization of stormwater discharge schemes in semi-arid cities in the north, and the use of economic, reasonable, and efficient retrofit measures in urban planning and design.