基于地下水位昼夜波动估算地下水蒸散量  

Groundwater Evapotranspiration Estimation from Groundwater Diurnal Variations

作　　者：贾伍慧 尹立河[2,3] 张俊[2,3] 王晓勇[2,3] 徐丹丹[4] 张燕[1] JIA Wuhui;YIN Lihe;ZHANG Jun;WANG Xiaoyong;XU Dandan;ZHANG Yan(School of Water Resources and Environment,China University of Geosciences,Beijing 100083,China;Xi'an Center of Geological Survey,China Geological Survey,Xi'an 710054,China;Key Laboratory for Groundwater and Ecology in Arid and Semi-Arid Areas,China Geological Survey,Xi'an 710054,China;School of Environmental Sciences ＆ Engineering,Chang'an Universily,Xi'an 710064,China)

机构地区：[1]中国地质大学水资源与环境学院,北京100083 [2]中国地质调查局西安地质调查中心,陕西西安710054 [3]中国地质调查局干旱半干旱区地下水与生态重点实验室,陕西西安710054 [4]长安大学环境科学与工程学院,陕西西安710064

出　　处：《人民黄河》2018年第8期66-70,74,共6页Yellow River

基　　金：国家自然科学基金资助项目(41472228);中国地质调查局地质调查项目(1212010634204;12120113104100)

摘　　要：干旱半干旱地区地下水蒸散发量(ETG)是地下水重要的源汇项之一,利用地下水位昼夜波动估算ETG具有数据获取简单、成本低、不确定参数较少等优势,其中Loheide方法精确度最高,且能够计算小时尺度的ETG。以毛乌素沙地实测地下水位为基础,改进了Loheide方法计算地下水蒸散发过程中水位恢复速率的计算方法,估算了小时尺度的ETG,并分析了植被生长季节ETG的变化规律及影响因素。结果表明:利用前日20:00至05:00估算水位恢复速率可以获取精确度高的ETG;利用改进的Loheide方法估算的研究区2012年6—9月平均每日ETG分别为3.92、3.62、4.15、2.95 mm/d,该估算结果与ET0相关性较好,精确度较高;植物生长季ETG受多种因素影响,包括气温、净辐射、植被蒸腾和土壤含水率等。In arid and semi-arid regions,groundwater evapotranspiration（ ETG） is a key element of water budget. ETGestimation by diurnal water table variations has advantages of simple data acquisition,low cost and low uncertainty parameters. Among the existing methods,the Loheide method is the most accurate and capable of calculating hourly ETG. Using the measured water table in Mu Us Desert,the calculation method of water level recovery rate of Loheide in the calculation of groundwater evapotranspiration was improved. And the modified Loheide method was used to calculate hourly ETGand analyze the variation and influencing factors of ETGin the growing season. The results suggest that the most accurate ETGcan be obtained by using water table measured during 20： 00 at the previous day to 05： 00 to infer the recovery rate. Estimated by the modified Loheide method,the average daily ETGis 3.92,3.62,4.15 and 2.95 mm/d respectively in the study area from June to September 2012. And the correlation between the estimated results and ET0 is good. ETGcan be influenced by many factors,including air temperature,net radiation,transpiration and soil moisture.

关 键 词：改进的Loheide方法 地下水蒸散发 地下水位昼夜波动 水位恢复速率 

分 类 号：P641.2[天文地球—地质矿产勘探]