ZI Qiang,YIN Le,YANG Zhong-tao,et al.Study on Theoretical Runoff Control Ability of Sponge Site Designed According to Volume Method[J].China Water & Wastewater,2020,36(16):24-29.
基于容积法设计的海绵场地理论径流控制能力研究
- Title:
- Study on Theoretical Runoff Control Ability of Sponge Site Designed According to Volume Method
- 关键词:
- 海绵城市; 容积法; 理论年径流总量控制率; 超额本底控制雨量
- Keywords:
- sponge city; volume method; theoretical volume capture ratio of annual rainfall; excess background control rainfall
- 摘要:
- 对《海绵城市建设技术指南——低影响开发雨水系统构建(试行)》中有关年径流总量控制率的定义进行了公式化表达。发现在设定的目标年径流总量控制率情况下，采用容积法确定LID设施规模的场地，其能达到的理论年径流总量控制率与目标年径流总量控制率之间存在差异。对两者的偏差值进行了研究，结果表明，影响各场降雨综合径流系数的因素均对偏差值产生影响。偏差值恒为负值，即因忽略了本底超额控制雨量，按照容积法确定的LID设施规模具有一定的安全度。以广州市降雨序列为例，计算了不同径流系数、不同目标年径流总量控制率情景下，按照容积法设计的海绵场地所能实现的理论年径流总量控制率。案例分析结果表明，理论年径流总量控制率总是大于目标年径流总量控制率，其相对偏差值在可接受范围内，但对于建设密度较大的老城区，因其径流系数较大，采用容积法设计的海绵设施规模安全余量较小，应当加以注意。
- Abstract:
- The definition of volume capture ratio of annual rainfall in the Technical Guide of Sponge City Construction—Low Impact Development Stormwater System Construction(Trial) was formulated. It was found that there was a deviation between the theoretical volume capture ratio of annual rainfall and the target volume capture ratio of annual rainfall in the case of setting the target volume capture ratio of annual rainfall when using the volume method to determine the LID facility sizes. The study results showed that the factors influencing the comprehensive runoff coefficient of each rainfall also affected the deviation value. The deviation value was always negative, that is, the LID facility designed by volume method had a certain degree of safety margin because the excess background control rainfall was ignored. Taking the rainfall series of Guangzhou City as an example, the theoretical volume capture ratio of annual rainfall in sponge sites designed by the volume method under different runoff coefficients and target volume capture ratio of annual rainfall was calculated. Case analysis results showed that the theoretical volume capture ratio of annual rainfall was always greater than the target volume capture ratio of annual rainfall, and the relative deviation was within the acceptable range. However, it should be noted that due to larger runoff coefficient in the old urban area with high building density, the safety margin of the sponge facilities designed by the volume method was small.
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