The applicability of earth resistivity methods for saline interface definition |
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| Institution: | 1. Centre d''Études Techniques de l''Équipement - Normandie Centre, ERA23, Université de Rouen, 10 chemin de la Poudrière, CS 90245, 76121 Le Grand Quevilly, France;2. Centre d''Études Techniques de l''Équipement - Normandie Centre, DADT, Université de Rouen, 10 chemin de la Poudrière, CS 90245, 76121 Le Grand Quevilly, France;3. Centre d''Études Techniques de l''Équipement - Normandie Centre, ERA44, 11 rue Laplace, CS 2912, 41029 Blois France;4. Laboratoire ECODIV, Institut de Recherche et d''Enseignement en Sciences de l''Environnement, Université de Rouen, Place Emile Blondel, F-76821 Mont Saint Aignan Cedex, France;5. Direction Régionale des Affaires Culturelles - Haute Normandie, Conservation Régionale des Monuments Historiques, 7 Place de la Madeleine, 76000 Rouen, France;6. Laboratoire de Morphodynamique Continentale et Côtiére, UMR 6143-CNRS, Université de Rouen, Place Emile Blondel, F-76821 Mont Saint Aignan Cedex, France;7. École Nationale des Sciences Géographiques, 6 et 8 Avenue Blaise Pascal, Cité Descartes, Champs-sur-Marne, 77455 Marne la Vallée, Cedex 2, France |
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| Abstract: | Direct current resistivity traversing has been used to characterise the nature of the saline interface at Te Horo on the Kapiti Coast in New Zealand. The results show that the interface in the vicinity of the settlement, which relies on bores for potable water, has intruded inland 10 m further than in undeveloped areas. Resistivity traversing has been particularly successful in defining subsurface areas of higher salinity by providing a two-dimensional image of the bulk resistivity structure. The results of the resistivity surveys are supported by bore water chemistry, which show evidence of saltwater mixing. Bores on beachfront properties have concentrations of up to 1% seawater. A resistivity formation factor has been derived to allow the pore fluid resistivity to be estimated for future coastal surveys. The results also illustrate the problems associated with using standard models to predict the location of the saline interface when small amounts of diffusive mixing occur. |
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