辽宁省场次暴雨时空分布特征研究

基于辽宁省基础水文数据库,选取资料完整可靠的481处雨量站作为代表站,筛选出1965～2014年间最大点降水量超过200mm的超标准暴雨124场,采用线性倾向估计、M-K检验、小波分析、克里金插值等技术,系统分析了辽宁省场次暴雨时空分布特征。结果表明,辽宁省超标准暴雨年发生次数在0～6次/年之间,年际变化基本持平,并呈现出3～5、13～15年2个主要周期;年内尺度上,超标准暴雨集中发生于7～8月,且主峰降水多集中于24h之内;空间分布上,暴雨中心多位于东南部地区,出现频次由东南部向西北部递减。暴雨中心位于辽西地区的场次暴雨多发生于7月;暴雨中心位于辽东地区的场次暴雨在7、8月均有发生,且位于东南部地区的暴雨多发生于8月。

Study on Spatial and Temporal Characteristics of Heavy Rainstorms in Liaoning Province

Based on the database of hydrological information in Liaoning Province, this paper selected 481 rainfall stations as the representative station, and screened out 124 heavy rainstorms with the maximum point precipitation exceeding 200 mm in 1965-2014 years. The methods such as linear tendency estimation, M-K test, wavelet analysis and Kriging interpolation were used to analyze the spatial and temporal characteristics of the heavy rainstorms. The results show that the annual occurrence number of heavy rain is between 0-6 times / year. The interannual changes are basically flat, which has 2 major cycles of 3-5 and 13-15 years. In the annual scale, the exceeded standard rainstorms usually occurred in July-August, and the main peak precipitation is mostly concentrated within 24 h. On the spatial characteristics, the rainstorm center is mostly located in the southeast of Liaoning Province, and the rainstorm frequency gradually decreased from southeast to northwest. The rainstorms which the rainstorm center located in the western region mostly occurred in July, and the rainstorms which the rainstorm center located in the western eastern region occurred in both July and August. Specially, the rainstorms which the rainstorm center located in the Southeastern region mostly occurred in August.