Impacts of climate change and sea level rise on coastal aquifers


Clarke, D. and Sanitwong Na Ayuttaya, S. (2006) Impacts of climate change and sea level rise on coastal aquifers. In, UK Young Coastal Scientists' and Engineers' Conference 06 (YCSEC’06), Southampton, UK, 19 - 20 Apr 2006.

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Description/Abstract

This paper presents research aimed at the investigation of the impacts of sea-level rise and climate change impacts coastal groundwater systems by developing models at locations where rise in sea level and climate change are occurring. Two target sites chosen for the model construction were selected, based on the availability of long runs of groundwater level data. The sites are Ainsdale on the Sefton coast in Northwest England and Samut Prakan near Bangkok. This paper will describe work carried out to date on constructing and testing an aquifer model for the Ainsdale site for the years 1972-2001. Groundwater levels in the dunes have been monitored at 11 wells every month since 1972. Water levels in the costal aquifer typically vary by plus or minus 0.5m between winter and summer each year and show sequences of wet and dry years that affect the local ecosystems. Some areas of the dunes fill with fresh groundwater each winter, which is vital to the breeding of Natterjack toads but in dry years some of theses areas remain dry.

A water balance and groundwater model has been constructed and tested against the observed well levels for the years 1972-2002. The model comprises a daily simulation of rainfall, soil moisture deficit and recharge based on an actual evapotranspiration sub model using the Penman Montieth equation and crop/soil descriptors. Groundwater flow is simulated with the Dupuit equation for unconfined flow. Some surface runoff occurs in very wet winters. Residual water is then assumed to contribute to groundwater storage and this storage is converted into modelled water table levels based on dune porosity functions.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology
G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TA Engineering (General). Civil engineering (General)
G Geography. Anthropology. Recreation > GC Oceanography
Divisions: University Structure - Pre August 2011 > School of Civil Engineering and the Environment
ePrint ID: 53477
Date Deposited: 29 Jul 2008
Last Modified: 27 Mar 2014 18:36
URI: http://eprints.soton.ac.uk/id/eprint/53477

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