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 (J1 and 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.
Highlights
The assessment of the structural stability of gravity dams is an important part of the overall process on ensuring the safety of both new and existing structures such as faults, fracture zones and folding [1]
The Mishan formation along with the Gachsaran formation cover the western part of the dam reservoir and dam site [3] [4]
As well, using the Digital Elevation Model (DEM) and geological maps, 3D Models of the area have been constructed (Figure 2). Based on these models, all the acquired fracture traces data were integrated in Geographic Information System (GIS) environment by using Arc GIS software
Summary
The assessment of the structural stability of gravity dams is an important part of the overall process on ensuring the safety of both new and existing structures such as faults, fracture zones and folding [1]. How to cite this paper: Khavari, R. (2015) Structural Analysis and Tectonic Investigation of Chamshir Dam Site, South West Zagros. R. Khavari play a major role in designing and constructing a dam [2], as they control the nature of geological formations and provide the needed materials for construction. The Zagros fold-thrust belt in SW Iran is a part of the Alpine-Himalayan system which consists of a variety of structures with different sizes or geometries. We try to evaluate stability of Chamshir Dam based on DEM and field investigations
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