Oceanic Pulse Forcing of a Beach Groundwater System
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Author(s)
Cartwright, N
Gibbes, B
Griffith University Author(s)
Year published
2011
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This paper presents the findings of a pilot study into oceanic pulse forcing of a sandy coastal aquifer. Field observations of the response of the aquifer to a wave setup induced pulse in shoreline levels reveal that the pulse penetrates further into the aquifer than the semi-diurnal tidal signal. The data are then used to evaluate the abilities of an existing analytical solution and a numerical model to predict the propagation of the pulse in the interior of the aquifer. Both the analytical and numerical models predict the growth of the time lag with landward distance of the pulse adequately but fail to reproduce the decay ...
View more >This paper presents the findings of a pilot study into oceanic pulse forcing of a sandy coastal aquifer. Field observations of the response of the aquifer to a wave setup induced pulse in shoreline levels reveal that the pulse penetrates further into the aquifer than the semi-diurnal tidal signal. The data are then used to evaluate the abilities of an existing analytical solution and a numerical model to predict the propagation of the pulse in the interior of the aquifer. Both the analytical and numerical models predict the growth of the time lag with landward distance of the pulse adequately but fail to reproduce the decay of the pulse, significantly over predicting the decay rates. In this instance, the presence of tidal fluctuations and a sloping ocean boundary have been eliminated as potential causes but another possible candidate that warrants further investigation in the future is the infiltration from wave runup which would act to increase groundwater levels.
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View more >This paper presents the findings of a pilot study into oceanic pulse forcing of a sandy coastal aquifer. Field observations of the response of the aquifer to a wave setup induced pulse in shoreline levels reveal that the pulse penetrates further into the aquifer than the semi-diurnal tidal signal. The data are then used to evaluate the abilities of an existing analytical solution and a numerical model to predict the propagation of the pulse in the interior of the aquifer. Both the analytical and numerical models predict the growth of the time lag with landward distance of the pulse adequately but fail to reproduce the decay of the pulse, significantly over predicting the decay rates. In this instance, the presence of tidal fluctuations and a sloping ocean boundary have been eliminated as potential causes but another possible candidate that warrants further investigation in the future is the infiltration from wave runup which would act to increase groundwater levels.
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Conference Title
20th Australasian Coastal and Ocean Engineering Conference 2011 and the 13th Australasian Port and Harbour Conference 2011, COASTS and PORTS 2011
Volume
SI 64
Publisher URI
Copyright Statement
© The Author(s) 2011. The attached file is reproduced here in accordance with the copyright policy of the publisher. For information about this conference please refer to the conference’s website or contact the authors.
Subject
Other earth sciences not elsewhere classified