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【目的】近年来雨水花园在海绵城市建设过程中得到了广泛应用，但其对浅层地下水的补给能力尚缺乏系统研究。【方法】通过柱状模拟试验，研究了不同降雨条件下，次降雨入渗补给系数(α)用于评估雨水花园补给地下水潜力的可行性。【结果】结果表明，α可用于评估雨水花园补给地下水潜力，数值变化范围为0.110～0.212,平均值为0.175;降雨重现期、降雨历时、雨型均对α具有重要影响，且随着重现期和降雨历时增加，α逐渐降低，不同雨型条件下，α大小顺序为均匀雨型>双峰雨型>单峰雨型。【结论】HYDRUS-1D模型模拟法和包气带含水率法计算α均具有较好的精度，不同降雨条件下，模型模拟法计算得出的次降雨入渗补给系数(αm)的相对偏差(RE)为-1.280%～7.801%,包气带含水率法计算得出的次降雨入渗补给系数(αb)的RE为-14.789%～6.660%。由于包气带含水率法容易实施、便于监测，工程实践中可优先考虑采用该方法。上述结果可为定量评估海绵城市建设过程中雨水花园补给浅层地下水潜力提供参考。
Abstract：[Objective] In recent years, rain garden have been widely used in the construction of sponge cities, but there is a knowledge gap on their recharge capacity to groundwater. [Methods]In this paper, the feasibility of using the sub-rainfall infiltration recharge coefficient(α) to evaluate the groundwater recharge capacity of rain gardens under different rainfall parameters are studied through scale experiment. [Results] The results show that α can well be used to evaluate the groundwater recharge capacity of rain gardens, the range is 0.110～0.212, with an average of 0.175. Rainfall return period, rainfall duration and hyetograph have important effects on α,which decreases gradually with the increase of rainfall return period and rainfall duration. Under different hyetograph, the sequence of α is uniform hyetograph > double peak hyetograph > single peak hyetograph. [Conclusion] Both the method of HYDRUS-1D model and the moisture content of vadose zone have high accuracy in calculating α. Under different rainfall parameters, the relative deviation(RE) of the infiltration recharge coefficient(αm) obtained by the HYDRUS-1D model simulation method is-1.280%～7.801%, and the RE of the infiltration recharge coefficient(αb) calculated by the method of moisture content of vadose zone is-14.789%～6.660%. As the method of moisture content of vadose zone is easy to implement and monitor, it can be prior used in engineering practice. The above results can provide a support for evaluating the recharge capacity of groundwater by rain garden in sponge city construction.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2023.02.010
中图分类号:TU992;P641.2
引用信息:
[1]李凯,王建龙,王雪婷,等.次降雨入渗补给系数评估雨水花园补给地下水可行性及计算方法研究[J],2023,54(02):108-117.DOI:10.13928/j.cnki.wrahe.2023.02.010.
基金信息:
“十四五”国家重点研发计划课题“城市更新场景下的内涝系统治理技术研究”(2021YFC3001400)