Runoff periodic change in upper and middle reaches of Lijiang River and influence degree analysis of human activities
In order to study the runoff periodic change characteristics and the influence degree of human activities in Lijiang River basin,based on the runoff and precipitation measuring data of Guilin and Yangshuo Hydrological Sta-tions from1968 to 2022,by use of anomaly accumulation method,ordered clustering method and linear fitting meth-od,stage division and mutation testing of runoff series as well as quantitative analysis of the impact of human activi-ties were conducted.The results of analysis demonstrate that:①From 1968 to 2022,the annual runoff in the upper and middle reaches of Lijiang River can be divided into four stages successively:low-,high-,low-and high-water,with the low-water period and high-water period of middle reaches being shorter and longer than that of upper reaches respectively;②The runoff series of Guilin and Yangshuo Hydrological Stations had abrupt changes in 2018 and 2014 respectively;③After the abrupt change,the runoff changes of Guilin Station and Yangshuo Station were influenced by human activities with the percentage up to 42.61%and 34.24%respectively,and were influenced by precipitation up to 57.39%and 65.76%respectively.Rainfall is still the major factor affecting the annual runoff change in the middle and upper reaches of Lijiang River.
runoff changehigh-water and low-water periodsabrupt change analysisimpact of human activitiesLijiang River
万方数据
维普
