ANALYSIS AND MODELLING OF GEOELECTRIC DATA MODELING FOR THE IDENTIFICATION OF GROUNDWATER AQUIFER AT CISARUA AREA, WEST BANDUNG
Groundwater is the main need of society in everyday life. Groundwater is one of renewable resources but it doesn’t mean that it can be exploitated without limit. Several factors that affect the availability of groundwater derived from nature such as geological conditions, rainfall, and green area...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/42050 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Groundwater is the main need of society in everyday life. Groundwater is one of
renewable resources but it doesn’t mean that it can be exploitated without limit.
Several factors that affect the availability of groundwater derived from nature such
as geological conditions, rainfall, and green areas should be considered. Water in
the soil is stored in a porous layer and has a good permeability is called an aquifer.
Cisarua area is located in West Bandung regency, West Java which is a hilly area
that has a topography with a slope ranging from normal to steep. The land use in
this area is still dominated with plantation and forest as green area. Groundwaer
aquifer characteristics in that area needs to be examined and analysed for the needs
of the community and agricultural business. In this research, the writer used
inversion modeling technique of geoelectric data to visualize the condition of
subsurface. Resistivity inversion modelling of apparent resistivity data as a result
of resistivity method with Wenner-Schlumberger configuration is then carried out
with least-square method. The initial model is modified in an iterative manner such
that the sum of square error of the difference between the model response and the
observed data values is minimized. The result of resistivity modelling is used for
analysis of aquifer characteristic such as lithology, depth and structure along with
considering geological reference. As the result of modelling, the area of
measurement is divided into three zones which are zone of aeration, zone of
saturation, and endapan formasi. Zone of aeration is located at depth 0-25 m with
resistivity 20-100 Ohm.m and the predicted lithology is gravel or weathered soil.
Zone of Saturation (akuifer) is located at depth 25-60 m with resistivity 4-30 Ohm.m
and the predicted lithology is sandstone or clay. Endapan Formasi Cibereum is
located at more than 60 m from ground with resistivity more than 100 Ohm.m and
the predicted lithology is sandy tuff or dry breccia |
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