Characteristics of Runoff in Shiyang River Basin Revealed by ESMD Analysis
With the global climate change intensified,Chinese regional water resources shortage is becoming increasingly serious.Using ade-quate method to study the varied pattern on runoff is particularly important for water resources planning and management.Based on the time series of mountain runoff from 1956 to 2018 in Shiyang River Basin,the periodic change,abrupt change and trend change of mountain runoff series in Shiyang River Basin were analyzed by using extreme-point symmetric mode decomposition(ESMD)method,and the Morlet wavelet analysis method,Mann-Kendall test method and R/S analysis method were used for comparative verification analysis.The results show that the ESMD method can analyze and process runoff data efficiently.The runoff series of Shiyang River has periodic changes of 3.0 years,7.3 years,12.6 years,and the time of mutation is different under different time scales,and the time of abrupt change in different time scales is also different.And forecast shows that the runoff in Shiyang River Basin will continue to increase in short term,but it will inevitably decrease in the long term.
国家科技期刊平台
NSTL
万方数据
