Evaluating Sediment Production Caused by the Lithology of the Geological Formations in Sedimentary Basins (Case Study: Lali Area, Khuzestan, Iran)
2016
As sediments are produced and accumulated in
sedimentary basins especially in dams’ reservoirs and they highly affect the
reservoirs life span, it is essential to scrutinize the effect of lithology and
types of geological formations of an area on the life span of reservoirs
specifically from the viewpoints of the erodability of these formations due to
their lithology type. Lali
area, Khuzestan, Iran and the water catchment of the intended area (based on
geological situation and Taraz dam situation) are placed in the sedimentary-structural
zone of the folded Zagros. The method of this research is based on analyzing
the topography and geology maps and field work in order to identify the lithology
of the geological formations. In fact, the amount of its erodability has been
characterized by the type of the geological formations. The current research
aims at putting the geological results, lithological data of the formations
types and the outcrop of the soil-lithological units together in order to
evaluate the sedimentary and erosive factors of these units and precisely
identify the area’s geological formations to remove the ambiguities in this
issue. Studies indicate that formations made of looser gypsum and marl like
Pabde-Gurpi and Gachsaran are exposed to more sedimentation and erosion than
the formations made of compacted lime stone and conglomerate with silica-lime
cement such as Bakhtiary and Asmari formations and the sand stones of
Aghajari formation reveal the moderate to high resistance. Thus, the
lithological identification of the formations, the type of sediments and their
looseness and hardness contribute to detect the amount and type of deposits
entering into the dam reservoir. The type and amount of these transported and
deposited sediments are assessed to predict more suitable optimized ways to
exploit dams’ reservoirs.
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