Spatial and Temporal Distribution Characteristics and Driving Forces of Rainfall Concentration in Guangdong Province in Recent 30 Years Under Changing Environment
Studying the temporal and spatial distribution characteristics of rainfall concentration can provide important theoretical basis for water resources management and flood prevention.The paper takes Guangdong Province as the study area,analyzes the spatial and temporal distribution characteristics of monthly rainfall concentration,uses Theil-Sen Median analysis and Mann-Kendall test to explore the trend characteristics of rainfall concentration,and uses the M-K mutation point test to identify the mutation points of rainfall concentration,and reveals the driving factors affecting the spatial and temporal distribution characteristics of rainfall concentration in the region of significance change based on the cross-wavelet analysis.The results show that the spatial distribution of rainfall between 1991 and 2022 is characterized by more rainfall in the central and western part of the country and less rainfall in the northeastern part of the country,with an overall"V"type fluctuation;rainfall in Guangdong Province has obvious seasonality in its distribution within the year,and the concentration of rainfall in the study area shows a non-significant increase in rainfall concentration in the western part of Guangdong Province and a decreasing trend in rainfall concentration in the western part of Guangdong Province.The rainfall concentration in the western part of Guangdong Province is significantly affected by atmospheric circulation anomalies,among which the Arctic Oscillation(AO)has the most significant influence.
rainfall concentrationcross waveletTheil-Sen Median analysisM-K test
万方数据
维普
