Study on evolutionary law of pan evaporation in Huaihe River Basin under the background of climate change

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Yan, Kun^1 ; Yang, Min-Zhi^2 ; Yao, Shui-Ping^1 ; Qian, Yi-Min^1 ; Li, Jie-Yu^2 ; Wu, Ye-Nan^2

Zhejiang Institute of Hydraulics and Estuary, No.50 Fengqi East Road, Hangzhou

310020, China^1

College of Hydrology and Water Resources, Hohai University, No.1, Xikang Road, Nanjing

210098, China^2

关键词: Air temperature;    Daily pan evaporation;    Evaporation paradoxes;    Evolution law;    Huaihe river basins;    Meteorological station;    Pan evaporation;    Variation characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/5/052044/pdf
DOI  :  10.1088/1755-1315/189/5/052044

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

Based on the daily pan evaporation and air temperature data of 28 meteorological stations in Huaihe River Basin from 1951 to 2015, the variation characteristics of pan evaporation and air temperature series in the same period are analysed, the evolution law of pan evaporation with climate change is discussed, and the existence of evaporation paradox is tested. The results show that: (1) the average annual evaporation changed significantly both in 1978 and 1998, dividing the evaporation series into high value fluctuating period, significant decreasing period and weak rising period. (2) the pan evaporation decreased obviously after the first mutation with air temperature increasing significantly, which indicates that there existed evaporation paradox in the basin from 1978 to 1998, and the spatial distribution of pan evaporation tendency was different obviously, gradually increased from southeast to northwest, from coast to inland, and from humid area to sub-humid area. The change of air temperature tendency was in contrast with evaporation at the same time. (3) after the second mutation, the decreasing trend of pan evaporation was stopped, and increased again insignificantly with the air temperature having a weak downward trend, which indicates that the evaporation paradox in the basin no longer exists after 1998.