雨型对低影响开发设施径流控制效果的影响

Influence of Rainfall Pattern on Runoff Control of Low Impact Development Facilities

采用模糊识别法对HZ市近10年的降雨数据进行雨型分析,并模拟研究等雨量下不同雨型对LID设施径流控制效果的影响。结果表明,HZ市的降雨多为较长历时的小雨,典型雨型为雨峰靠后的单峰雨型,该雨型对LID设施的蓄滞要求较高,因此在LID设施规模上建议考虑适当的安全冗余。另外,案例模拟结果表明,单峰雨型下,LID设施的径流总量控制和峰值削减效果较好,但峰值延滞效果不及均匀雨型和双峰雨型。

The fuzzy recognition method was applied to analyze the rainfall pattern by inputting the recent 10 years rainfall data in HZ city,and the influence of various rainfall patterns with identical rainfall volume on runoff control effect of low impact development (LID) facilities was simulated. It was found that most common rainfalls in HZ city were the light rain with long duration. Besides,the typical rainfall pattern was unimodal type with a later peak,which required higher retention performance of LID facilities. Therefore,it was suggested to consider appropriate security redundancy in design scale of LID facilities scale. In addition,the LID facilities had a better effect on the total runoff volume control and peak reduction under the unimodal types rainfall,but it had a poorer effect on the peak delay compared with those of the uniform type rainfall and bimodal type rainfall.