Long-term Variation Trend and Sustainability Analysis of Precipitation,Evaporation and Runoff in Hanjiang Basin
Long-term variation trend analysis of hydrological element in Hanjiang basin including precipitation, evaporation and runoff is the precondition of development and utilization of water resources, and study of the impact of human activities on ecological environment. Based on the observed monthly precipitation and temperature data of 13 survey stations from 1960 to 2003 in Hanjiang basin, the annual runoff is calculated with Takahashi Koichiro's evaporation model. And nonparametric Mann-Kendall method is used to detect long-term variation trend of precipitation, evaporation and runoff. Then the Hurst exponential method is applied to analyze the trend persistence of hydrological elements. The results show that Takahashi Koichiro's evaporation model has strong adaptability for annual runoff calculation and it is worth promoting! the annual precipitation in the upper reaches of the Hanjiang basin appears downward trend while it is upward trend in the lower reaches! for annual evaporation, it appears significant upward trend in the upper reaches; for annual runoff, the upper reaches appears downward trend but Zhongxiang. Tianmeng and Wuhan station appear upward trendi for hydrological elements, persistence trend is strong and the constant C of precipitation, evaporation and runoff is 0. 73, 095, 0. 97, respectively.
NETL
NSTL
万方数据
维普
