Open AccessTrend Analysis and Periodicity Analysis of Annual Precipitation in Dongxi River Basin of Xiamen
Author(s) -
Shen Kaiqi,
Chenglin Zhao,
Xiangyu Zhang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/793/1/012008
Subject(s) - precipitation , trend analysis , structural basin , water resources , environmental science , irrigation , period (music) , hydrology (agriculture) , drainage basin , wavelet , agriculture , climatology , geography , meteorology , geology , mathematics , ecology , statistics , paleontology , physics , geotechnical engineering , cartography , archaeology , artificial intelligence , computer science , acoustics , biology
Precipitation is an important part of hydrology, which is of great significance to local water resources allocation and farmland irrigation. This study uses the Dongxi River basin in Xiamen City as the research area. Based on the precipitation series data from 1956 to 2015, the Mann-Kendall test, linear regression method, Sen’s slope estimation and wavelet analysis are used to analyze the trend and periodicity of precipitation. The results show that precipitation generally followed a small rise over a period of 60 years. The Mann-Kendall test detected several possible change points, but they can only indicate that the precipitation in the basin changes frequently. In addition, wavelet analysis reveals that the annual precipitation series have main periods of 4a, 12a, 30a, and 49 a, and on the time scale of the first main period, the precipitation has undergone two wet and dry transitions between 1956 and 2015. Our results reveal the trend and periodicity of precipitation in Dongxi River basin, which is conducive to the optimization of local water resources allocation, and provides scientific support for subsequent agricultural water conservancy project application and ecological construction.