Liao Z L, Zhang G Q, Wu Z H, He Y, Chen H
State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China E-mail:
Water Sci Technol. 2015;71(8):1136-42. doi: 10.2166/wst.2015.076.
Although low impact development (LID) has been commonly applied across the developed countries for mitigating the negative impacts of combined sewer overflows (CSOs) on urban hydrological environment, it has not been widely used in developing countries yet. In this paper, a typical combined sewer system in an urbanized area of Shanghai, China was used to demonstrate how to design and choose CSO control solutions with LID using stormwater management model. We constructed and simulated three types of CSO control scenarios. Our findings support the notion that LID measures possess favorable capability on CSO reduction. Nevertheless, the green scenarios which are completely comprised by LID measures fail to achieve the maximal effectiveness on CSO reduction, while the gray-green scenarios (LID measure combined with gray measures) achieve it. The unit cost-effectiveness of each type of scenario sorts as: green scenario > gray-green scenario > gray scenario. Actually, as the storage tank is built in the case catchment, a complete application of green scenario is inaccessible here. Through comprehensive evaluation and comparison, the gray-green scenario F which used the combination of storage tank, bio-retention and rain barrels is considered as the most feasible one in this case.
尽管低影响开发（LID）已在发达国家普遍应用，以减轻合流制污水溢流（CSO）对城市水文环境的负面影响，但在发展中国家尚未得到广泛应用。本文以上海城市化地区一个典型的合流制排水系统为例，展示了如何使用雨水管理模型，利用低影响开发来设计和选择CSO控制解决方案。我们构建并模拟了三种类型的CSO控制情景。我们的研究结果支持了低影响开发措施在减少CSO方面具有良好能力的观点。然而，完全由低影响开发措施组成的绿色情景未能在减少CSO方面达到最大效果，而灰绿情景（低影响开发措施与灰色措施相结合）则实现了这一目标。每种情景的单位成本效益排序为：绿色情景>灰绿情景>灰色情景。实际上，由于在案例集水区建有储水池，这里无法完全应用绿色情景。通过综合评估和比较，使用储水池、生物滞留池和雨水桶组合的灰绿情景F被认为是这种情况下最可行的方案。
