Analysis of Irrigation Water Use Efficiency Based on the Chaos Features of a Rainfall Time Series

摘要

The chaos theory is used to analyze the mechanism behind the response of irrigation water use efficiency (IWUE) to rainfall in irrigation districts of the Heilongjiang Province in China. The Lyapunov exponent and correlation dimension of the monthly rainfall time series of eight large-and medium-sized irrigation districts are calculated, and the correlations between IWUE and certain factors are analyzed. The results indicate that the monthly rainfall time series of each district sample exhibits chaotic characteristics, and high correlations exist between IWUE and the chaos features of the monthly rainfall time series. Furthermore, the scale of the irrigation district has some correlations with IWUE. The research results show that the difference in the temporal distribution of rainfall and the difference in the scale of an irrigation district both impact IWUE. This study provides a theoretical basis for improving the usage efficiency of water resources in the irrigation districts of Heilongjiang Province and for increasing the IWUE.