Experimental observations of watertable waves in an unconfined aquifer with a sloping boundary

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Title Experimental observations of watertable waves in an unconfined aquifer with a sloping boundary
Author Cartwright, Nicholas Brian; Nielsen, Peter; Li, Ling
Journal Name Advances in Water Resources
Year Published 2004
Place of publication United Kingdom
Publisher Pergamon
Abstract Observations of horizontal and vertical variations in piezometric head in a homogeneous, laboratory aquifer are presented and discussed. The observed fluctuations are induced by a simple harmonic oscillation in the clear water reservoir acting across a sloping boundary. The data qualitatively supports existing theories in that higher harmonics are generated in the active forcing zone and that a significant increase in the inland, asymptotic watertable over height (relative to that found for the vertical boundary case) is observed. The observed overheight is shown to be accurately reproduced by existing small-amplitude perturbation theory. Detailed measurements in the vicinity of the sloping boundary reveal that the signal of generated higher harmonics is strongest near the sand surface and that vertical flows are significant in this region. The aquifer is of finite-depth and is influenced by capillary effects, the experimental data therefore exposes limitations of theories which are based on the assumption of a shallow aquifer free of capillary effects. The dispersive properties of the measured pressure wave in the aquifer are comparable to those found from field observations and likewise do not agree with those predicted by the capillary free, shallow aquifer theory. Although some improvement is obtained, discrepancies between the data and theory persist even when a finite-depth aquifer and capillary effects are considered in the theoretical model. Further sand column experiments eliminate a truncated capillary fringe as a possible contributor to these discrepancies. However, the neglect of horizontal flows in the fringe may have caused the discrepancies.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.advwatres.2004.08.006
Volume 27
Issue Number 10
Page from 991
Page to 1004
ISSN 0309-1708
Date Accessioned 2006-06-27
Date Available 2015-02-02T04:16:00Z
Language en_US
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Groundwater Hydrology
URI http://hdl.handle.net/10072/16714
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1x

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