Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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 |
ISSN | 1431-2174 |
EISSN | 1435-0157 |
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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