Abstract
Contamination of groundwater with pesticides and nitrate has compelled the Danish Government to launch a major hydrogeological mapping programme covering about 40% of the land area of Denmark. Numerous geophysical surveys are currently being carried out in order to acquire the necessary data. These new data are crucial for the 3-D geological models that are used in the planning of future water supply and landuse. Normally, site-specific groundwater protection zones (Thomsen et al. 2004) are based on groundwater modelled catchment areas for each well, but proper 3-D geological models are needed in order to create a valid basis for the groundwater models. Since most of the Danish nearsurface geology is complex, a full geological understanding is required combined with in-depth interpretation of geological and geophysical data. Much research has dealt with geophysical mapping and numerical groundwater modelling, but only limited research has combined these topics for geological modelling. Prior to geophysical mapping, groundwater models were based on simple data extraction from well databases without inclusion of geophysical data. In the following, a concept for detailed 3-D geological modelling with hydrogeophysical data is presented for a specific area.
Highlights
Contamination of groundwater with pesticides and nitrate has compelled the Danish Government to launch a major hydrogeological mapping programme covering about 40% of the land area of Denmark
Much research has dealt with geophysical mapping and numerical groundwater modelling, but only limited research has combined these topics for geological modelling
The heterogeneity in the shallowest parts of the subsurface is commonly too great to obtain a proper correlation between the pulled array continuous electrical sounding method (PACES) survey lines, but at larger depths a better correlation is achieved by the SkyTEM data
Summary
A three-step approach for 3-D geological modelling used for hydrogeological purposes has recently been developed in Denmark (Jørgensen et al 2008). With this approach the modelling both ensures a thorough data interpretation and utilises the potential that lies in establishing an understanding of the geological history. The approach divides the geological model into three submodels: 1. A general, conceptual geological model which is primarily descriptive and imaged in conceptual cross-sections. The conceptual geological model is based on a review of former work and existing literature
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