Watertable wave dispersion in sandy coastal aquifers

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Title Watertable wave dispersion in sandy coastal aquifers
Author Cartwright, Nicholas Brian; Nielsen, P.; Li, L.
Publication Title Advances in Hydro-science and Engineering
Editor M. S. Altinakar, S. S. Y. Wang, K. P. Holz, M. Kawahara
Year Published 2004
Place of publication Mississippi, USA
Publisher National Centre for Computational Hydroscience and Engineering, University of Mississippi
Abstract In this paper, the dispersion of watertable waves in sandy coastal aquifers is investigated through both field and laboratory observations. The observations are used to assess the performance of various small-amplitude dispersion relation theories. In all cases, the simplest shallow, capillary-free aquifer theory is shown to be inadequate. Field observations of semi-diurnal tidally forced watertable waves can be reproduced reasonably `well upon consideration of the effects of vertical flows. At this oscillation frequency capillary effects are shown to be small. Laboratory experiments conducted with a much faster oscillation period [O(T)] = 100's of seconds, analogous to oceanic long waves) begin to highlight some limitations of the current theories. Much of the discrepancy between the theories and data can be overcome by consideration of capillary effects which become more influential at the higher oscillation frequencies. The dispersion of higher harmonic components generated due to a sloping ocean-aquifer interface are also investigated in the laboratory and significant discrepancies between data and predictions persist suggesting that processes not previously considered are significant. One example may be the influence of horizontal flow in the capillary fringe.
Peer Reviewed Yes
Published Yes
Publisher URI http://www.ncche.olemiss.edu/iche2004/
ISBN 0-937099-12-0
Conference name 6th International Conference on HydroScience and Engineering (ICHE 2004)
Location Brisbane, Australia
Date From 2004-05-31
Date To 2004-06-03
URI http://hdl.handle.net/10072/23074
Date Accessioned 2006-07-10
Language en_AU
Faculty Faculty of Engineering and Information Technology
Subject PRE2009-Groundwater Hydrology
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1x

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