Seite - 326 - in Book of Full Papers - Symposium Hydro Engineering

[18] Wang Zhihong,Tian Lei,Li Yanchun&Cao Ning(2014).Comparative analysis of climate change in upper basin of Qingtongxia reservoir between impounding before and after.Ningxia Engineering Technology, Volume 13,Issue 3,pp241-246, (In Chinese). SUMMARY 1.Air temperature of A County and B County display some differences pre and post water storage,especially in the winter and summer seasons,with the maximum temperature differencesbeing7℃ and 3.8℃ respectively.After water storage in the reservoir,air temperature is more stable than previously. In addition, air temperature effects depend on the distance from the dam to the data measuring points and are more obvious at closer locations. 2.After water storage in the reservoir,air humidity increases largely in the seasons of winter,spring and autumn, with little rise in summer.Air humidity of A County behave similarly to B County,but the former is more obviously affected than the latter.The maximum air humidity differences are 25% and 18% respectively. 3.Precipitation of A County and B County increase all year round, as well as during the flood season.Annual increases in precipitation are 70% and 31 % respectively,and the main precipitation is concentrated during the flood season,which warns that human beings should expect extreme weather events and potential flood disasters in this period. 4.Water storage in the reservoir could increase the specific heat capacity of the water volume and affect air temperature and humidity by the evaporation- condensation process.Air temperature is quite an important factor regarding air humidity, as the transfer of humidity to precipitation is the reason why annual precipitation is mainly concentrated during the flood season, with the need to prevent flood disasters during this period. 326