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Study on return period of rainfall erosivit in China

机译:中国降雨侵蚀恢复期的研究

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摘要

Calculation of retum periods of annual and maxi mum event rainfall erosivity is an important foundation for accurately predicting soil loss and designing soil and water conservation measures. Year-to-year minutely rainfall data in the period from 1961---2000 are collected from twelve weather stations located in the four water erosion regions in China. The Generalized Extreme Value analysis (GEV) is used to fit the annual and maximum event rainfall erosivity in order to study on different levels of retum period. Maximum event rainfall erosivity of 20、 50、 100-year frequency vary from 1126 to 4807 MJ mm ha-1h-1, from 1512 to 7570 MJ mm ha-1h-1, and from 1859 to 10654 MJ mm ha-1h-1 respectively. Annual rain fall erosivity of 20、 50、 100-year frequency vary from 2434 to 13800 MJ mm ha-1h-1y-1, from 2844 to 16703 MJ mm ha-1h-1y-1, and from 3137 to 19137 MJ mm ha-1h-1y-1 respectively.
机译:计算年度和Maxi Mum事件降雨侵蚀性的重新计算是准确预测土壤损失和设计水土保持措施的重要基础。 1961年至2000年,从位于中国四个水侵蚀地区的十二个气象站收集了一年到2000年的初步降雨数据。广义极值分析(GEV)用于符合年度和最大事件降雨侵蚀性,以便研究不同水平的重新计算。最大事件降雨侵蚀性为20,50,100年频率从1126到4807 MJ mm-1h-1,从1512到7570 mm mm ha-1h-1,以及1859到10654 mj mm ha-1h-1分别。年雨下降弱点20,50,100年频率从2434到13800 mm mm-1h-1y-1,从2844到16703 mm mm ha-1h-1y-1,以及3137到19137 mm mm ha -1H-1Y-1分别。

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