甘肃省河东地区不同时段暴雨空间格局研究

Spatial Structure Analysis for Different Intervals' Rainstorm in The Eastern Regions of Gansu

本文利用甘肃省河东及其周边地区的200多个站点的暴雨多年最大值资料研究了10m in、60m in、6h、24h和3d 5种时段的暴雨多年最大值空间分布格局。结果表明:时段越长空间分布的水平地带性越强。3d和24h暴雨受东南季风影响,降雨量呈现从东南向西北递减的水平地带性规律;10m in暴雨受地形的影响,呈现出开口朝北"U环"形态,高值区出现在东南部的陇南山地、六盘山山地,以及甘南高原北缘、东缘;60m in和6h受地形和东南季风的共同影响,属于东南-西北渐变型与"U环"型的过渡类型。

Based on the maximum rainstorm data for 5 time intervals of 10 minutes,60 minutes,6hours,24 hours and 3days collected from more than 200 stations located in the eastern regions of Gansu,the spatial distribution structure was analyzed. It was shown that the longer the storm lasted, the more obvious zonal rule its distribution. The spatial distributions of the maximum rainstorm for 3days and 24hours presented the horizontal zonal rule from the southeast to the northwest because of the influence of Southeast Monsoon. The terrain made the maximum rainstorm with in 10 minutes presenting the ＂u＂ configuration . Because of the influences of Southeast Monsoon and terrain , the spatial distributions of the maximum rainstorm with in 6 hours and 60 minutes presented the transitional trait.