Natural Resources Research Articles
The application of AEM to mapping sea-water intrusion at La Grange, WA
Document Type
Article
Publication Date
3-2019
Journal Title
ASEG Extended Abstracts
Keywords
Airborne electromagnetic, groundwater, inversion
Disciplines
Geology | Geophysics and Seismology | Hydrology | Natural Resources and Conservation | Water Resource Management
Abstract
We describe interpretation of an AEM survey around the La Grange allocation area, WA. This survey was designed to map aquifer bounds and the sea water intrusion, and then to assess groundwater in the region, and to facilitate planning water use.
The simple, stratified nature of sediments of the western onshore Canning Basin allowed us to use blocky layered earth models and we found that five-layer models were the most parsimonious. After deriving surfaces representing the top of the Jarlemai siltstone and the top of the sea water ingress, we were able to effectively characterise the spatial characteristics of the sea water intrusion.
We found that in places, sea water intruded 40 km inland, and could be found at a depth of over 250 m.
Recommended Citation
Annetts, D., Ibrahimi, T., Davis, A., George, R., Cahill, K., Munday, T., & Paul, R. (2015). The application of AEM to mapping sea-water intrusion at La Grange, WA. ASEG Extended Abstracts, 2015(1), 1–4. https://doi.org/10.1071/ASEG2015ab164
