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首页> 外文期刊>Journal of hydrology, New Zealand >Dependence of flood peak magnitude on catchment area
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Dependence of flood peak magnitude on catchment area

机译：洪峰强度对集水面积的依赖性

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The relationship between flood peak andcatchment area is examined and exceed-ance probabilities of an envelope line forthese variables is derived for Westland,New Zealand. In particular, dimensional and RationalMethod analysis, together with statisticalevidence, is used to show that flood peakmagnitude is proportional to catchmentarea raised to the power of 0.75. Theanalyses also support the mathematicalform of the empirical TM61 formula andits recommended use in New Zealand forchecking estimates of flood peak magnitudein small, ungauged catchments. Using flood records from Westland, anenvelope line is derived from a logarithmic plotof maximum recorded flood peak magnitudeagainst catchment area for Westland. Theexpected exceedance probability of theenvelope and the exceedance probability ofthe expected envelope are estimated. Valuesobtained are consistent with assessmentsprovided by station year and index floodmethods. Consequently, where envelope lines canbe derived, they provide a useful preliminaryestimate or a quick check on other estimatesof flood peak magnitude and its exceedanceprobability obtained, for instance, fromrainfall-runoff models or flood frequencyanalysis.
机译：考察了洪峰与集水面积之间的关系，并得出了新西兰韦斯特兰的包络线上述变量的超概率。尤其是，使用维度分析和RationalMethod分析以及统计证据来表明，洪水峰强度与集水区成正比，提高到0.75的幂。这些分析还支持经验TM61公式的数学形式，并建议在新西兰将其用于检查未受污染的小流域的洪峰幅度估计。使用来自韦斯特兰的洪水记录，包络线是从最大记录的洪水峰幅度相对于韦斯特兰的集水区的对数图得出的。估计信封的预期超出概率和预期包络的超越概率。获得的值与台站年份和指数洪水方法所提供的评估相一致。因此，在可以推导出包络线的地方，它们可以提供有用的初步估计或快速检查洪水峰值大小及其超出概率的其他估计值，例如从降雨径流模型或洪水频率分析中获得的估计值。

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