基于Morlet小波分析的变化环境下大型灌区降水结构和周期特性研究
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摘要
为研究变化环境下大型灌区降水结构和周期特性,以山东省某大型灌区为例,通过Mann-Kendall突变确定1964-2018年共55年降水序列的突变年份,将序列划分为环境变化前后两段。然后,以趋势分析和Morlet小波理论为基础,研究变化环境下灌区的降水结构和周期特性。结果表明,该灌区降水序列在1986年发生显著性突变,变化环境影响灌区年际降水趋势,降水量逐年减少,并且表现出15年和7年嵌套的周期性特征。研究成果可为灌区水资源管理分配工作提供一定参考。
In order to study the structure and periodic characteristics of precipitation in large-scale irrigation area under changing environment,a case study of Weishan irrigation area in large-scale irrigation area of the Yellow River diversion was carried out. Through Mann-Kendall mutation,the abrupt years of precipitation sequence in 1964-2018 were determined,and the sequence was divided into two stages before and after environmental change. Then,based on trend analysis and Morlet wavelet theory,the precipitation structure and periodic characteristics of irrigation area under changing environment are studied. The results show that the precipitation sequence in irrigation area changed dramatically in 1986. The change has an impact on the annual precipitation trend in irrigation area. The precipitation decreases year by year,and shows the nested periodic characteristics of15 and 7 years. The study can provide reference for water resources management and distribution in irrigation districts.
In order to study the structure and periodic characteristics of precipitation in large-scale irrigation area under changing environment,a case study of Weishan irrigation area in large-scale irrigation area of the Yellow River diversion was carried out. Through Mann-Kendall mutation,the abrupt years of precipitation sequence in 1964-2018 were determined,and the sequence was divided into two stages before and after environmental change. Then,based on trend analysis and Morlet wavelet theory,the precipitation structure and periodic characteristics of irrigation area under changing environment are studied. The results show that the precipitation sequence in irrigation area changed dramatically in 1986. The change has an impact on the annual precipitation trend in irrigation area. The precipitation decreases year by year,and shows the nested periodic characteristics of15 and 7 years. The study can provide reference for water resources management and distribution in irrigation districts.
引文
[1]李子龙.环境变化对秃尾河流域径流情势的影响研究[D].西安:西安理工大学,2018.
[2]蔡涛.基于Mann-Kendall方法的大凌河中上游1964-2016降水变化特性分析[J].人民珠江,2018,39(11):83-88.
[3]徐飞,贾仰文,牛存稳,等.变化环境下北京清水河流域径流响应研究[J].水电能源科学,2019,37(1):17-20.
[4]栾晓波.基于水文过程的作物生产水足迹量化方法研究[D].北京:中国科学院大学(中国科学院教育部水土保持与生态环境研究中心),2018.
[5]易彬,曾小凡,赵娜,等.基于标准化降水蒸散指数的长江流域旱涝情势演变[J].南水北调与水利科技,2018,16(1):89-94.
[6]李彬.变化环境下黄河流域水汽时空演变特征及水文响应研究[D].呼和浩特:内蒙古农业大学,2018.
[2]蔡涛.基于Mann-Kendall方法的大凌河中上游1964-2016降水变化特性分析[J].人民珠江,2018,39(11):83-88.
[3]徐飞,贾仰文,牛存稳,等.变化环境下北京清水河流域径流响应研究[J].水电能源科学,2019,37(1):17-20.
[4]栾晓波.基于水文过程的作物生产水足迹量化方法研究[D].北京:中国科学院大学(中国科学院教育部水土保持与生态环境研究中心),2018.
[5]易彬,曾小凡,赵娜,等.基于标准化降水蒸散指数的长江流域旱涝情势演变[J].南水北调与水利科技,2018,16(1):89-94.
[6]李彬.变化环境下黄河流域水汽时空演变特征及水文响应研究[D].呼和浩特:内蒙古农业大学,2018.