| 摘要: |
| 利用岳阳市2015～2017年232个区域气象站、6个国家气象站降水资料和EC细网格风场资料,采用统计分析等方法总结了近三年暴雨日变化特征和空间分布特征,分析了暴雨产生的中低层影响系统的天气形势,结果表明：岳阳市暴雨过程日变化规律有集中型暴雨、持续型暴雨和波动型暴雨3个类型,集中型暴雨主要出现在华容站、平江站白天和汨罗站晚上；持续型暴雨主要出现在岳阳站全天和临湘站晚上；波动型暴雨出现在临湘、湘阴、汨罗站白天和华容、湘阴、平江站晚上。岳阳市暴雨过程的空间分布频次为东部高于西部,药姑山区暴雨次数最多,强度最大,是岳阳市暴雨中心,连云山区为次暴雨频次中心和局地暴雨强度中心,幕阜山区仅有局地暴雨频次中心,地形是岳阳市暴雨出现频率高和暴雨强度大的重要因素；全市性大范围暴雨受天气系统影响更明显,地形影响也是全市性大范围暴雨的重要影响因素,最强暴雨区范围在药姑山区及其新墙河流域。区域性暴雨在连云山区有暴雨重叠区域,连云山区也是区域性暴雨中心。影响岳阳市暴雨的中低层天气系统以急流和冷切变居多,低涡次之、暖切变(横切变)和低槽较少,大多数暴雨过程有多个天气系统配合出现。 |
| 关键词: 暴雨;时空分布;形势分析;岳阳 |
| DOI： |
| 投稿时间：2018-09-26修订日期：2018-12-08 |
| 基金项目: |
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| Temporal and spatial distribution and characteristics of Rainstorm in Yueyang in recent 3 years |
| Yu Changjian,Chen Jiaorong,Yu Yu |
| (Yueyang Meteorological Bureau,Hunan Yueyang;Xiangyin Meteorological Bureau,Hunan Xiangyin) |
| Abstract: |
| Based on the precipitation data from 232 regional meteorological stations, 6 national meteorological stations and EC fine grid wind field data in Yueyang from 2015 to 2017, the daily variation characteristics and spatial distribution characteristics of heavy rain in the past three years are summarized by statistical analysis, and the weather situation of the influence system of the middle and lower levels caused by heavy rain is analyzed. The results show that there are three types of daily variation of heavy rain in Yueyang: concentrated heavy rain, continuous heavy rain and fluctuating heavy rain. The concentrated heavy rain mainly occurs in Huarong Station, Pingjiang Station during the day and Miluo Station at night. Continuous heavy rain mainly occurred in yueyang railway station all day and Linxiang Station at night. The fluctuating rainstorm occurred in Linxiang, Xiangyin and Miluo stations during the day and at Huarong, Xiangyin and Pingjiang stations at night. The spatial distribution frequency of the rainstorm process in Yueyang City is higher in the east than in the west, with the highest frequency and intensity in Yaogu Mountain, which is the rainstorm center in Yueyang City, Lianyun Mountain is the rainstorm frequency center and local rainstorm intensity center, and Mufu Mountain is only the local rainstorm frequency center. Topography is an important factor for the high frequency and intensity of rainstorm in Yueyang City. The influence of the weather system on the heavy rain in the whole city is more obvious, and the terrain influence is also an important factor affecting the heavy rain in the whole city. The strongest heavy rain area is located in Yaogu Mountain Area and Xinqiang River Basin. Regional heavy rain has overlapping areas in Lianyun Mountain, which is also a regional heavy rain center. The lower and middle level weather systems that affect the rainstorm in Yueyang City are mainly jet stream and cold shear, followed by low vortex, warm shear ( transverse shear ) and low trough. Most rainstorm processes have multiple weather systems. |
| Key words: Rainstorm; spatial and temporal distribution; situation analysis; Yueyang |
