Comparing phreatic evaporation at zero water table depth with water surface evaporation

作     者：HU Shunjun GAN Yongde CHEN Yongbao 

作者机构：State Key Laboratory of Desert and Oasis EcologyXinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China State Key Laboratory of Simulation and Regulation of Water Cycle in River BasinChina Institute of Water Resources and Hydropower ResearchBeijing 100038China Central South Institute of Metallurgical GeologyYichang 443003China 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2018年第10卷第6期

页      面：968-976页

核心收录：

学科分类：07[理学] 

基　　金：funded by the National Natural Science Foundation of China (41671032, U1303181) the Key Special Project of National Key Research and Development Program of China (2016YFC0501401) the National Basic Research Program of China (2013CB429902) 

主　　题：phreatic evaporation water table depth water surface evaporation soil texture soil thermal capacity 

摘      要：Salt-affected soils are mostly found in irrigated areas within arid and semi-arid regions where the groundwater table is *** of this type have become an increasingly severe problem because they threaten both the environment and the sustainable development of irrigated agriculture.A tool to estimate phreatic evaporation is therefore urgently required to minimize the salinization potential of salt-affected *** this context,phreatic evaporation at zero water table depth(E0)is a key parameter for establishing a model for calculating phreatic *** aim of this study was to explore the law of phreatic evaporation and to develop structurally rational empirical models for calculating phreatic evaporation,based on E0data of six types of soil(i.e.,gravel,fine sand,sandy loam,light loam,medium loam,and heavy loam)observed using the non-weighing lysimeter and water surface evaporation(E601)data observed using a E601 evaporator of same evaporation area with a lysimeter-tube at the groundwater balance station of the Weigan River Management Office in Xinjiang Uygur Autonomous Region,China,during the non-freezing period(April to October)between 1990 and *** relationship between E0and E601was analyzed,the relationship between the ratio of E0to E601and the mechanical compositions of different soils was presented,and the factors influencing E0were *** results of this study reveal that E0is not equal to *** fact,only values of the former for fine sand are close to those of the *** also show that E0values are related to soil texture as well as to potential atmospheric evaporation,the ratio of E0to E601and the silt-clay particle content(grain diameter less than 0.02 mm)is negatively exponentially correlated,and that soil thermal capacity plays a key role in phreatic evaporation at *** results of this analysis therefore imply that the treatment of zero phreatic depth is an essential requirement when constructing groundwater balance st