| To solve the contradiction between the city construction and city greening,and city rainwater utilization,constructing two kinds of roof greening as the research object,analysis and utilization of rainwater resources on performance of roof greening.The first choice of Huaian city common plants,according to the research results of other researchers,select the appropriate planting the matrix were constructed and the proportion of roof greening lawn and shrub roof greening.Through the study of roof greening planting matrix and ceramsite storage properties,calculation and analysis of two kinds of roof greening theory saturation holding capacity were 75.3484L,155.9033L.in order to compare the difference of roof greening ability with actual water storage theory,through the simulation of different intensity of natural rainfall on the green roof,from the actual situation,compared to two the way was less than the theoretical value.Through the theoretical calculation,to be able to analyze the rain generated by roof greening,the minimum thickness of the rainfall runoff were 19.5mm,31.8mm,according to the situation of rainfall in Huaian,the ground rain will make green roof rainwater runoff.If produced in the building roof above does not exist at the green,the rain would wash the roof,and then into the ground,after the construction of green roof can effectively reduce the area of roof rainwater runoff and runoff pollutants.In this thesis we for roof rainwater to analysis and research,and through the simulation of natural precipitation,so we can study the roof greening,the purification capacity of roof the rain and the green roof on pollutants in roof runoff reduction,the lawn green roof to roof rain water pollution The purification effect of compounds were:pH:12.8%-19.9%;COD:30.0%-39.9%;NH4+-N:38.9%-54.5%;TN:35.7%-42.7%;purification effect of TP:40.6%-48.8%.shrub roof greening of roof rainwater pollutant were:pH:6.2%-11.2%;COD:33.4%-40.0%;NH4+-N:36.0%-50.5%;TN:38.8%-49.8%;TP:29.6%-44.8%.Overall,the landscaping of lawn roofs is slightly better than that of a shrub roof.Huaian city in the rainy seasons,the rainy season,the roof greening without artificial irrigation;dry season,you need to maintain artificial watering in roof greening plants need.21 century freshwater for roof greening construction should be avoided as much as possible to increase the burden of freshwater resources,water during the dry season as selection of roof greening irrigation water,the feasibility study of reclaimed water irrigation the green roof.Through the experiment,the purification effect of roof greening lawn of reclaimed water were:pH:2.1%;COD:-4.5%;NH4+-N:22.4%;TN:4.3%;the net effect of TP:32.0%.on water roof greening shrubs were:pH:1.8%;COD:-9.0%;NH4+-N:25.2;TN:3.8%;water pollutants in TP:35.2%.In addition the pollutants in water is the lawn type effect is slightly better,except COD were decreased,in general,the water quality is worse than before,so we need to through the roof greening of reclaimed water irrigation,but not too much to irrigate green roof runoff water production. |
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