摘要
利用高分辨率再分析降水资料(中国区域地面气象要素数据集),运用格点平均值法求得资水流域及各分区1979-2018年逐日面雨量,并对资水流域面雨量进行统计分析和线性趋势分析。结果表明,资水流域全区年面雨量变化趋势呈现缓慢增加的特征,其中柘溪库区和资水下游面雨量呈现增加趋势,罗家庙以上和罗冷区间面雨量呈现减少趋势。资水全区春季面雨量呈现为减少的趋势,其他3个季节面雨量均呈现为增加的趋势。资水各分区面雨量主要集中在3-8月份,月平均面雨量均在100 mm以上,同时全年逐月面雨量变化呈现双峰型,第一个峰值出现在6月份,第二个峰值出现在10月份。资水全区逐年最大日面雨量呈现出逐年增大的趋势,年最大日雨量主要分布于5-7月份。罗家庙以上和罗冷区间两个分区逐年雨水期中期面雨量整体呈现出下降的趋势,而柘溪库区和资水下游为上升趋势,各分区雨水集中期均主要分布在3-7月份,各分区雨季开始的时间均集中在3月份。
Using high-resolution reanalysis of precipitation data(CMFD),the grid average method was used to obtain the daily area rainfall of the Zishui river basin and each sub-region from 1979 to 2018,then the statistics and linear trend characteristics of the area rainfall in the Zishui river basin was analyzed.The results showed that the annual areal rainfall in Zishui river basin showed a slow increase.Among them,the area rainfall in the Zhexiquku and the Zishuixiayou showed an increasing trend,and the area rainfall in Luojiamiaoyishang and Luolengqujian showed a decreasing trend.In Zishui river basin,the area rainfall in spring showed a decreasing trend,and the area rainfall in the other three seasons showed an increasing trend.The area rainfall in all districts of Zishui river basin is mainly concentrated from March to August,and the monthly average area rainfall is above 100mm.At the same time,the monthly area rainfall changes throughout the year are bimodal,with the first peak in June and the second peak in October.The annual maximum daily rainfall in Zishui river basin is increasing year by year,and the annual maximum daily rainfall is mainly distributed from May to July.The area rainfall of the Luojiamiaoyishang and Luolingqujian showed a downward trend in the middle of the rainy season year by year,while the Zhexiquku and the Zishuixiayou showed an upward trend.The rainwater concentration period of each subregion was mainly distributed from March to July.The start of the rainy season in each district is concentrated in March.
作者
罗潇
廖春花
罗菁
谭诗琪
LUO Xiao;LIAO Chun-hua;LUO Jing;TAN Shi-qi(Hunan Meteorological Service Center,Changsha 410118,China;Key Laboratory for Meteorological Prevention and Mitigation of Disasters in Hunan Province,Changsha 410118,China;Hunan Climate Center,Changsha 410118,China)
出处
《水利科技与经济》
2022年第1期44-50,共7页
Water Conservancy Science and Technology and Economy
基金
湖南省气象局第三期业务能力建设项目《湖南流域面雨量气候背景分析及集合预报模型研究》(NLJS09)。
关键词
面雨量
线性趋势
雨季
资水流域
area rainfall
linear trend
rainy season
Zishui river basin
