Research on the Effectiveness of Low-Impact Development Measures in Dealing with Extreme Rainfall
In order to explore the improvement effect of low impact development(LID)measures on regional runoff un-der extreme rainfall conditions,five kinds of green roof physical model test devices(GR1-GR5)were built,and the rainfall runoff response curve under simulated rainfall conditions was obtained.Secondly,the SWMM runoff model of Yutou plot in Tongguan District of Tongling City was constructed,and combined with the test data,the analysis was focused on the effects of green roof substrate thickness and initial saturation on regional runoff improvement were studied.The results show that the application of matrix composition volume ratio:light sandy loam∶humus∶vermiculite=5∶3∶2 has the most obvious improvement effect on regional runoff.Com-pared with the case without LID,the overall regional runoff reduction rate under different rainfall conditions is between 5.13%～18.09%.When matrix composition volume ratio:leaf mould∶vermiculite∶sandy soil and gar-den soil∶turf∶vermiculite and fertilizer are applied,the runoff reduction rate is between 3.41%～11.75%and 2.98%～10.18%,respectively,and the regional runoff improvement effect is the worst.There was a positive correlation between the overall runoff reduction rate and the substrate thickness of the green roof,and the in-fluence of the substrate thickness on the runoff peak reduction rate was slightly lower.There was a linear nega-tive correlation between the overall runoff reduction rate and the initial saturation of the green roof soil matrix,and the reduction rate of the peak runoff also showed a decreasing trend with the increase of the initial satura-tion of the soil matrix.
low-impact development measuresextreme rainfallrunoffgreen roof
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