Analysis of effect of road sprinkling system for heat island reduction

摘要

An effective management plan for rainwater use is being prepared in Korea to secure alternative water resource and propose urban heat island reduction policy. This study evaluated the effects of road sprinkling system installed in an apartment housing complex to improve the effectiveness of -rainwater use, first in Korea. The efficiency of the application mechanism and probable effects of the road sprinkling system using collected rainwater were investigated. A system for effective use of rainwater was designed through hydrologic analysis performed by monitoring and conducting surveys such as citizens' satisfaction rate. Road sprinkling system installed can be used for dust and temperature reduction wherein the equipment automatically sprinkles water on the road after collecting rainwater through a general collector on the rooftop. In doing so, road surface temperature, water quality analysis, microclimate forecast before and after sprinkling, and maximum wind speed immediately after sprinkling were under the comfortable condition as suggested by the citizen's survey results. Evaporative latent heat effect of road surface lasted until 40 min after sprinkling. The road surface temperature was lowered by approximately 5 degrees C after sprinkling. This shows that road sprinkling system can contribute to the reduction of heat islands. Furthermore, there was no significant reduction rate for the water quality analysis. However, since turbidity and SS concentrations were about 0 mg/L after 10 min of sprinkling, improvement of water quality was observed. For micropollutants in water quality, traces of Cu, Zn, and Ni, which are generally present in rainwater, were found. Since the observed concentrations were low, the rainwater sprinkling system will have no significant environmental effect. The result of this study may be used as a reference for the installation of rainwater-use facilities such as road sprinkling system for apartment housing complex in other urban areas and detailed design guidelines.