Arid
DOI10.1007/s10040-007-0239-0
Estimating groundwater evapotranspiration rates using diurnal water-table fluctuations in a semi-arid riparian zone
Lautz, Laura K.
通讯作者Lautz, Laura K.
会议名称6th Ordinary Session of the African-Ministers-Council-on-Water (AMCOW)
会议日期MAY, 2007
会议地点Brazzaville, CONGO
英文摘要

In semi-arid climates, phreatophytes draw on shallow aquifers, and groundwater evapotranspiration (ETG) is a principal component of groundwater budgets. Diurnal water table fluctuations, which often are a product of ETG, were monitored in the riparian zone of Red Canyon Creek, Wyoming, USA. These fluctuations were higher in a riparian wetland (2-36 mm) than a grass-covered meadow (1-6 mm). The onset and cessation of water-table fluctuations correspond to daily temperatures relative to freezing. Spatial differences were due to vegetation type and specific yield, while temporal changes were due to vegetation dormancy. Ratios of ETG to potential evapotranspiration (PET), K-c,K-GW, were similar to ratios of actual evapotranspiration (ET) to PET, K-c, in semi-arid rangelands. Before vegetation senescence, K-c,K-GW increased between precipitation events, suggesting phreatophytes pull more water from the saturated zone as soil moisture decreases. In contrast, K-c decreases with soil moisture following precipitation events as ET becomes increasingly water-limited. Error in ETG is primarily from estimates of specific yield (S-y), which is difficult to quantify in heterogeneous sediments. ETG values may be more reliable because the range of acceptable S-y is smaller than K-c and S-y does not change with vegetation type or soil moisture.


英文关键词diurnal water table evapotranspiration arid regions phreatophytes USA
来源出版物HYDROGEOLOGY JOURNAL
ISSN1431-2174
EISSN1435-0157
出版年2008
卷号16
期号3
页码483-497
出版者SPRINGER
类型Article;Proceedings Paper
语种英语
国家USA
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000255032600007
WOS关键词GREAT-BASIN ; LAND COVERS ; VEGETATION ; RECHARGE ; WETLANDS ; SURFACE ; STREAM ; DEPTH ; USA
WOS类目Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Geology ; Water Resources
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/297147
作者单位(1)SUNY Coll Environm Sci & Forestry, Dept Forest & Nat Resources Management, Syracuse, NY 13210 USA
推荐引用方式
GB/T 7714
Lautz, Laura K.. Estimating groundwater evapotranspiration rates using diurnal water-table fluctuations in a semi-arid riparian zone[C]:SPRINGER,2008:483-497.
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