辽河出海口64年降水特性分析

Precipitation Characteristic Analysis of Liaohe Estuary in 64 Years

为加大最大连续降水量和最长连续降水日数对地区降水极端事件产生重要影响的认识,以辽河出海口1951—2014年5—9各月的最大连续降水量及最长连续降水日数作为辽河出海口降水特性分析对象,采用一元线性趋势估计和小波分析。结果表明：5—9月最大连续降水总量减少并存在7～8年左右的时间尺度周期;5—9月最长连续降水日总数随时间的推移下降,存在11年左右时间尺度周期;5—9月营口站64年最大连续降水量的波动和最长连续降水日数的减少是产生辽河出海口降水量减少的主要原因之一,而降水的＂极端天气气候事件＂的发生受7、8、9月最大连续降水量的影响。

To understand the important influence on regional precipitation extreme events caused by themaximum continuous precipitation and the longest continuous rainy days, the maximum continuousprecipitation and the longest continuous rainfall days in each month from May to September in 1951 to 2014 atLiaohe River Estuary were regarded as precipitation characteristics analysis object by using linear trendestimation and wavelet analysis. The results showed that the maximum consecutive precipitation from May toSeptember was reducing and a time scale cycle of about 7-8 years existed. The total longest continuous rainfalldays from May to September were reducing,and had a 11-year time scale cycle. The maximum continuousprecipitation fluctuation at Yingkou from May to September and the longest continuous rainfall days reducingwere parts of major causes of precipitation reduction at Liaohe River Estuary. The occurrence of‘extremeweather events＇ in precipitation was affected by the maximum consecutive precipitation from July to September.