ABSTRACT Geological factors play a
major role in constructing and stability a dam. The study area is Chamshir Dam,
which is located on the Zohreh River, 20 km southeast of Gachsaran City (southwest
Iran). The satellite images are valuable means available to geologists for
locating geological or geomorphological features expressing regional fault or
fracture systems, therefore, the satellite images are used for structural
analysis of the Chamshir dam area. As well, using the DEM and geological maps,
3D Models of the area have been constructed. Then, based on these models, all
the acquired fracture traces data are integrated in Geographic Information
System (GIS) environment by using Arc GIS software. Based on field
investigation and DEM model, main structures in the area consist of Cham Shir
syncline and two fault sets, the main thrust faults with NW-SE direction and
small normal faults in NE-SW direction. There are three joint sets in the study
area, both of them (J1and
J3) are the main large fractures around the Chamshir dam. These
fractures indeed consist with the normal faults in NE-SW direction. The third
joint set in NW-SE is normal to the others. In general, according to
topography, geomorphology and structural geology evidences, Chamshir dam has a
potential for sliding in some parts of Gachsaran formation.
Cite this paper
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