摘要
采用Mann-Kendall检验法对贺江流域近50年的降水量和径流量变化趋势和突变特征进行分析,结果表明:①贺江流域多年平均降水量为1632.8 mm,多年平均径流量为78.6亿m3;②贺江流域降水量和径流量总体呈现上升趋势,全年、雨季上升趋势不显著,枯季上升趋势显著,通过信度90%显著性检验;③20世纪90年代以前,贺江流域降水量和径流量突变特征基本一致,90年代之后,突变特征出现差异,径流量突变点明显较降水量偏多。
The Mann-Kendall Method was used to analyze the variation trend and mutation characteristics of precipitation and runoff in Hejiang River Basin in the past 50 years.The results showed:①The annual average precipitation in Hejiang river basin is 1632.8mm.The annual average runoff is 7.86 billion cubic meter;②The precipitation and runoff in Hejiang River Basin both showed an increasing trend.Annually,during rainy season,the upward trend is not significant,however,during dry season,the upward trend is significant,and passed the 90%significance test;③Before the 1990s,The mutation characteristics of precipitation and runoff in Hejiang river basin are basically consistent.After the 1990s,differences appeared in mutation characteristics,the number of mutation points of runoff is significantly more than that of precipitation.
作者
董向
DONG Xiang(Zhaoqing Hydrologic Branch of Guangdong Hydrologic Bureau,Zhaoqing 526060,China)
出处
《广东水利水电》
2021年第4期73-78,共6页
Guangdong Water Resources and Hydropower
