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了解黄土丘陵区暴雨时空变化特征,有利于深入研究土壤侵蚀机理。利用雨量站控制条件较好的桥沟小流域资料,统计分析了该流域30min、60min、120min和150min时段降雨及次降雨空间变化的关系,时段降雨分布同次降雨分布的内在联系以及次降雨的时空变化过程。结果表明,当分析时段达到一定长度以后,时段降雨对次降雨分布具有一定的代表性;降雨空间变化程度的相关距离关系随距离的增加而减弱,从时间上看,暴雨中心位置是不断变化的。
Understanding the temporal and spatial variation of rainstorms in the loess hilly region is beneficial to further study on soil erosion mechanism. Based on the data of Qiaogou small watershed with good control conditions at rainfall stations, the relationship between rainfall and sub-rainfall spatial variability at 30min, 60min, 120min and 150min intervals, the internal relations of the same rainfall distribution and the sub-rainfall distribution Temporal and spatial change process. The results show that when the analysis period reaches a certain length, the rainfall in the period has a certain representation of the distribution of the sub-rainfall. The correlation distance of the degree of spatial variation of rainfall decreases with the increase of the distance. From the time point of view, the center position of the rainstorm is constantly changing .