Classifying the water table at regional to continental scales

被引:195
|
作者
Gleeson, Tom [1 ]
Marklund, Lars [3 ]
Smith, Leslie [1 ]
Manning, Andrew H. [2 ]
机构
[1] Univ British Columbia, Dept Earth & Ocean Sci, Vancouver, BC V6T 1Z4, Canada
[2] US Geol Survey, Denver, CO 80225 USA
[3] Swedish Meteorol & Hydrol Inst, SE-60176 Norrkoping, Sweden
基金
加拿大自然科学与工程研究理事会;
关键词
GROUNDWATER-FLOW; THEORETICAL-ANALYSIS; SURFACE; TOPOGRAPHY;
D O I
10.1029/2010GL046427
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Water tables at regional to continental scales can be classified into two distinct types: recharge-controlled water tables that are largely disconnected from topography and topography-controlled water tables that are closely tied to topography. We use geomatic synthesis of hydrologic, geologic and topographic data sets to quantify and map water-table type over the contiguous United States using a dimensionless criterion introduced by Haitjema and Mitchell-Bruker (2005), called the water-table ratio, which differentiates water-table type. Our analysis indicates that specific regions of the United States have broadly contiguous and characteristic water-table types. Water-table ratio relates to water-table depth and the potential for regional groundwater flow. In regions with recharge-controlled water tables, for example the Southwest or Rocky Mountains, USA, water-tables depths are generally greater and more variable and regional groundwater flow is generally more important as a percentage of the watershed budget. Water-table depths are generally shallow and less variable, and regional groundwater flow is limited in areas with topography-controlled water tables such as the Northeast USA. The water-table ratio is a simple but powerful criterion for evaluating regional groundwater systems over broad areas. Citation: Gleeson, T., L. Marklund, L. Smith, and A. H. Manning (2011), Classifying the water table at regional to continental scales, Geophys. Res. Lett., 38, L05401, doi: 10.1029/2010GL046427.
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页数:6
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