The use of GIS and resistivity imaging techniques to determine landslide probability based on internal and external causal factors
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Date
2010-05
Authors
Al-Musawi, Hussein Abdelwahab Moussa
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Abstract
The main objective of the study is to investigate the landslide probability map
through internal and external causal factors. The most important internal causal factors of
landslide (ICFL) are subsurface structure, groundwater, sliding subsurface and water
movement whereas external causal factors of landslide (ECFL) are slope angle, aspect of
the slope, elevation of the slope and the land cover. Part of Karak highway in Malaysia
has been selected for the study due to frequent occurrences of landslide. A new integration
between Resistivity Imaging (RI), and Geographic Information System (GIS) were carried
out to study the landslide in the target area. The RI has been used to find out the ICFL
whereas the GIS was used to present the factors. Theodolite and GPS were used to
determine the ECFL. Digital Elevation Model (DEM) and GIS were used to map the
ECFL. Before applying the RI to find out the ICFL, a new approach called Monitoring
and Enhancing Accuracy of Resistivity Imaging (MEARI) was suggested to increase the
efficiency of the RI. Moreover, a comparison between the most common conventional
arrays has also been carried out to find out the rpost suitable array for the study.
The efficiency of the RI by using the proposed MEARI approach has been
increased to 97% to use RI without other geophysical techniques or boreholes. Wenner
array was found to be the best array for the study area and the probability map of ICFL
shows that the probability of landslide ranges between very low to medium. Whilst, the
probability map of ECFL shows that the probability of landslide ranges between medium
to high. The prot~,bility map of the integration between the ECFL and the ICFL shows
that the probabiIil) of landslide ranges between low to high.
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Keywords
Investigate the landslide probability map , through internal and external causal factors