IMPACT OF PERMEABLE BRICK PAVEMENT ON STORMWATER RUNOFF THERMAL POLLUTION

With the rapid development of sponge city, permeable brick pavement has been widely used in practical engineering, but its impact on stormwater runoff thermal pollution is in shortage of systematic research. The artificial simulated rainfall method was used to study the stormwater runoff temperature reduction effect of the permeable brick paving system by using the impervious asphalt pavement as comparison. The research content include the runoff temperature of the permeable brick paving surface, the temperature of the permeate water, and the thermal transfer characteristics of each structural layer. The experimental results show that when P=5 a and the initial temperature of the permeable brick paving surface is 35, 42, 47 ℃, compared with impervious asphalt, the runoff temperature of the permeable brick paving surface can be reduced by 1.4~1.8 ℃, and the higher the initial temperature of the paving surface, the higher the temperature of the stormwater runoff, and the higher the temperature of the permeate water. The permeable brick paving structure layer can reduce the temperature of the permeable part of the stormwater runoff. The permeate water temperature is reduced by 3.5~4.9 ℃ compare to the runoff temperature. The rainfall return period has a significant effect on the runoff temperature, but its effect on the temperature of the permeate water is slight. Therefore, permeable brick paving can reduce urban stormwater runoff thermal pollution effectively.