Variation Trend and Cause Analysis of Evaporation and Precipitation in Fuxian Lake Watershed
Zhao Yao
Li Chao
Wang Dong
Li Wenfeng
Abstract：In order to study the change characteristics and reasons of evaporation and precipitation in Fuxian Lake watershed,the monthly data about precipitation,temperature,evaporation,sunshine hours,wind speed and relative humidity in Fuxian Lake watershed from 1980 to 2013 were collected,then the change characteristics and reasons of evaporation and precipitation in the past 34 years were researched by the linear trend,regression analysis,cumulative deviation,Mann-Kendall and correlation analysis.The results showed that the annual precipitation of Fuxian Lake watershed decreased with no significance,but decreased significantly after 2000.Summer precipitation exceeded the annual precipitation by 1/2.The annual evaporation showed a U-shaped change.Spring evaporation was over 1/3 of all the year round.The annual evaporation of Fuxian Lake watershed was mainly affected by sunshine hours,average wind speed and average temperature with highly significantly positive correlation.The precipitation had no direct effect on evaporation,and affected evaporation mainly through sunshine hours.This research established a prediction equation based on sunshine hours,average wind speed,average temperature for evaporation of Fuxian Lake watershed with the negative correlation coefficient of 0.867.
Keywords：Fuxian Lake watershedClimatic persistenceClimatic statisticChange trendEvaporationPrecipitation
Publication Date：2017-10-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：6( 100-105 )