灾害学2024，Vol.39Issue(4)：174-178,5.DOI:10.3969/j.issn.1000-811X.2024.04.025
金沙江下游某水电站坝区降水特征分析
Analysis of Hourly Precipitation Characteristics of a Hydropower Stations in the Lower Reaches of the Jinsha River
摘要
Abstract
Extreme rainfall over the Jinsha River Basin has the characteristics of strong local and heavy short-term rainfall.Analyzing the characteristics of extreme precipitation in this region is helpful for assisting hydropower stations to im-prove their ability to cope with extreme heavy precipitation events and prevent and mitigate disasters.Using the observation dataset of 6 automatic weather stations in the region from 2011 to 2022,the spatio-temporal variation characterists of ex-treme hourly precipitation are analyzed by methods as quality control,feature value extraction and classification statistical analysis.The results show that:① The characteristics of night-time precipitation in the distribution of daily precipitation in the hydropower station area are obvious,and the frequency of short-term heavy precipitation is higher at night and early morning.② In terms of monthly and seasonal variation,the peaks occurred in July and September,respectively,and the precipitation in July was higher in the second half of the night,and the proportion in September was higher than in July.③Select the maximum three extreme hourly precipitation threshold indicators were selected to preliminarily analyze the tempo-ral and spatial variation characteristics of extreme hourly precipitation.The intensity of extreme hourly precipitation gradually decreases from upstream to downstream and from northwest to southeast.The extreme precipitation events lasted for an aver-age of 6.04 h,and the precipitation distribution in the processes was asymmetrical,and the precipitations developed rapid-ly in the early stage of the process,peaking at an average of 1.66 h.④ Extreme hourly precipitation events had high intensi-ty and high efficiency,and are more prone to disasters,accounting for 24%to 33%of the average annual precipitation.Through more than ten years of practices,they have shown that the above precipitation characteristics have certain applica-tion values for water storage scheduling and risk control.关键词
金沙江下游/水电站/强降水阈值/降水时空分布/特征分析/水库调度Key words
the lower reaches of Jinsha River/hydropower station/threshold of extreme rainfall/spatiotemporal distribution/precipitation characteristics/reservoir regulation分类
环境科学引用本文复制引用
徐舒扬,王汉涛,赵南山,彭启洋,唐盛,李振杰..金沙江下游某水电站坝区降水特征分析[J].灾害学,2024,39(4):174-178,5.基金项目
中国长江电力股份有限公司项目"水电站气象灾害特性研究"(Z542202001) （Z542202001）
云南省政府决策咨询课题"提升强降水精准靶向预警能力,建立防灾减灾救灾联动应急机制"(ZFKKT-2021-096) （ZFKKT-2021-096）
