城市暴雨强度公式编制与分析研究 Parameters Calculation and Study of Urban Rainstorm Intensity Formula

Abstract

为提高城市防洪能力，防控城市内涝，用近年长系列有代表性的可靠的降雨资料，建立符合当地客观实际的城市暴雨强度公式，并籍此计算相应较高标准的设计暴雨强度和设计流量。本文以黄山市为例，研究了城市暴雨频率p-III型分布参数的推求和建立暴雨公式方法及年次频率的转换。论证了城市暴雨公式的频率分布是p-III型分布α = 1或Cs = 2时的特例，形式简单，仅两个参数，从而提出频率曲线的适线技巧，操作更加方便，并按照超定量系列的分布趋势，分段适线，对各历时的频率曲线进行了平衡协调等，使频率曲线更为合理，精度更高，误差更小。同时介绍了Cv值的调整与计算方法及年多个样法的频率转换公式，并进行优越性评价与比较。 In order to improve the urban flood control capacity and prevent urban waterlogging, typical and reliable rainfall data collected in recent years are analyzed to set up an urban rainstorm intensity formula in accordance with the practical situation and on which the calculation of a comparatively high standard storm intensity and design water flow is based. Taking Huangshan City as an example, the paper calculates the urban rainstorm frequency distribution model of p-III type parameters and establishes rain- storm formula method and frequency conversion in frequency and time. It demonstrates that the frequency distribution of urban rainstorm formula is a special case of p-III distribution when α = 1 or Cs = 2. The frequency distribution has a simple form, only two parameters. And then the frequency curve line technique is put forward, operating more convenient. According to the distribution trend of super quantitative series, piecewise line, frequency curve of the last balance coordination, etc., the frequency curve with higher precision, less error is more reasonable. Meanwhile, the adjustment and calculation of Cv and yearly multiple frequency conversion formula are mentioned, so as to evaluate and compare the corresponding advantages and disadvantages.