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Assessment of methods for obtaining rainfall intensity-duration-frequency ratios for various geographical areas

机译：评估各种地理区域的降雨强度-持续时间-频率比的方法

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Several procedures for obtaining rainfall intensity-duration-frequency (IDF) relationships for storm durations ranging from 10 min to 24 h and for several return periods were analyzed. The data recorded for the period 1966?1997 are from five different locations in southern Spain: one mountain, two inland, and two littoral stations. We analyzed the original equations of Wenzel, Bell, Chen and Témez, and other ones modified from the last two. The first step was to determine the parameters of each equation for each geographical location. Subsequently, the coefficient of variation (CV) and index of agreement (ia) of each equation were calculated in order to compare their estimations for rainfall durations of less than 2 h and less than 24 h. The results show that there is not one equation which is best suited for all the geographical areas or rainfall durations. The reference method, Wenzel apos;s equation, is the best for rainfall periods of less than 24 h, but only for the littoral and inland geographical areas. If Wenzel apos;s equation is not taken into account, the modified Témez equation proved to be the best at generating series for mountain areas and for the two rainfall periods studied. Therefore, in a regional study of rainfall durations of less than 24 h, where only 24 h data are available, and with littoral, inland and mountain areas, the modified Témez equation is strongly recommended.
机译：分析了几种获取风暴强度-持续时间-频率（IDF）关系的方法，这些关系适用于持续时间为10分钟至24小时的暴雨持续时间以及多个返回期。 1966-1997年期间记录的数据来自西班牙南部的五个不同地点：一座山，两个内陆和两个沿海站点。我们分析了Wenzel，Bell，Chen和Témez的原始方程，以及从后两个方程修改而来的其他方程。第一步是确定每个地理位置的每个方程的参数。随后，计算每个方程的变异系数（CV）和一致性指数（ia），以便比较降雨时间少于2小时和少于24小时的估计。结果表明，没有一个方程最适合所有地理区域或降雨持续时间。参考方法，Wenzel方程，对于少于24小时的降雨时段是最佳的，但是仅对于沿海和内陆地理区域是最佳的。如果不考虑Wenzel方程，则经修改的Témez方程被证明是最适合产生山区和所研究的两个降雨时段的序列。因此，在区域降雨持续时间少于24小时的区域研究中，只有24小时数据可用，并且对于沿海，内陆和山区，强烈建议使用修正的Témez方程。

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