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| Titel |
Application of three dimensional geological models to hydrogeology |
| VerfasserIn |
M. Dong, C. Neukum, R. Azzam |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022622
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| Zusammenfassung |
| Recently, three dimensional (3D) numerical simulation of subsurface structure has become a
common engineering geological tool to investigate a variety of geological settings. Besides,
hydrogeology always tightly combines with geological structures. For these reasons, coupling
3D geological models with hydrogeology will not only improve understanding of subsurface
conditions, but also provide a common stratigraphic framework for hydrogeological
applications.
The reliability of 3D geological models largely depends on the quality and quantity of
data. Normally, before 3D geological models are constructed in the software package, the
initial data (borehole descriptions, geological maps, geological cross sections, outcrop data,
geo-electrical survey, digital elevation model, etc.) are acquired from archive as much as
possible and standardized in a single table. To ensure the precision of models, new drilling
data should be gathered from local authorities such as Geological Survey in time. Some
experimental data are necessary to be kept at the initial moment to create a subset for
verification of the models.
In particular, the resulting models will be used for hydrogeological applications. So, more
parameters should be collected to construct the 3D property models. Properties contain
porosities of soil, bearing capacity, compressibility and particular geological phenomenon
such as the regional aquifers, aquitard and faults. During the processing of model
construction, the minimum element of the models is grid, which can be converted to some
finite elements software.
Further studies of these models to hydrogeological application involve:
integrating faulted horizons of the 3D geological model into the groundwater
modeling software package and simulating the groundwater flow within the main
relevant aquifers using a finite elements approach;
simulating distribution and calculating volume of groundwater in particular area;
providing 3D parameters for vulnerability maps of groundwater, and comparing
the results with the vulnerability maps constructed by 2D parameters;
establishing the information system as a complement for long-term land use
planning of cities; and
helping to control widespread land subsidence risks in cities where the water
table is lower by overexploitation of groundwater. |
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