Hydrologic Response of Sustainable Urban Drainage to Different Climate Scenarios

摘要

Sustainable Urban Drainage Systems (SUDS, also sometimes referred to as green infrastructure or low-impact development) to enhance or replace conventional stormwater management practices have become a centerpiece of many urban stormwater management plans. This paper investigates the behavior of urban runoff under different long-term climate scenarios with various densities of SUDS implementation. Long-term (12-year) rainfall and evaporation data from ten different cities throughout the country were used to represent distinctive potential future climate scenarios. These data were input into a set of SWMM models of a 3.16 km~2 urban catchment, with each model having a different SUDS implementation. Under each set of SUDS implementation, results using different climate inputs were compared. The capability of SUDS to perform under varying climate scenarios provides an estimate of the resilience of the different SUDS implementations to potential long-term climate change. Results showed that large time scale hydrological variability was more sensitive to SUDS implementation than climate change, while flow duration curve was more sensitive to climate change. Differences in hydrologic response with SUDS between different climate scenarios suggest that SUDS implementation can be optimized to improve performance for different long term climate projections.