摘要
利用四川宝兴县1970—2000年及2008—2014年的小时和部分分钟降水量资料,对宝兴县5—9月汛期短时强降水的时空分布特征进行了分析。结果表明：宝兴短时强降水集中发生在7、8两月;由于地形地貌特征复杂,不同的海拔高度及地形位置,短时强降水强度差异较大,海拔1400~1500m之间的降雨强度最大、海拔2580m左右区域的降雨时数最长,此2种降水类型均易引发泥石流等地质灾害;海拔1300m以下,海拔高度愈高,γ中尺度系统发展愈均匀持久,降雨强度愈强,海拔1300 m以上,海拔高度愈高,γ中尺度系统发展愈激烈快速,降雨强度愈弱。
Based on the hourly and minutely precipitation data of 1970 to 2000from 2008 to 2014,the spatial-temporal distribution characteristics of short-period heavy precipitation from May to September in Baoxing are analyzed.The results indicate that：short-period heavy precipitation in Baoxing occurs in July and August mostly;owing to complex topography,different altitude and location,the intensity of shortperiod heavy precipitation varies greatly;the maximum rainfall intensity is at the altitude of 140 to 1500meters and the longest rain duration at the altitude about 2580 meters,which are apt to lead to geological disasters such as debris flow;below the altitude of 1300 meters,the higher the altitude is,the longer the development of the meso-γscale system sustains and the stronger the precipitation intensity is,and above the altitude of 1300 meters,vice versa.
出处
《气象科技》
北大核心
2016年第3期423-429,438,共8页
Meteorological Science and Technology
基金
"小流域山洪泥石流灾害的精细预报"(西南区域2014-6)项目资助
关键词
短时强降水
时空分布
γ中尺度系统
short-period heavy precipitation
spatial-temporal distribution
meso-γscale system
