Evaluating the Amount of Erodability and Sedimentation by Comparing Sediment Weight Model and PSIAC Experimental Model (Case Study: Lali Water Catchment, Khuzestan, Iran)
2016
The upstream water catchments are the main source providing sediments in
rivers and sedimentary basins. The balance between the erosion phenomenon and
the amount of sediment entering into the basin relies on the geometrical
specifications and the morphology of the river along the water catchment
direction and the amount and type of the sediments. The sedimentary feed of
rivers and basins are changed for the sake of natural factors or human
disturbances. The river and basin react against this change in that their
shape, morphology, plan and profile get changed due to the increase or decrease of the input sediment into the basin. It is essential
to know the sediment amount produced by erodability and sedimentation of
upstream basins and effects of projects and also to evaluate the amount
of sedimentary load in base studies, civil projects, optimizing rivers and dam
construction studies specially calculating the amount of sediment amount
entering into the dams’ reservoirs in order to take engineering decisions and
related alternatives. Sediment Weight Model and PSIAC Experimental Model are
recognized as two common methods calculating the amount of the produced
sediment caused by erosion applied in this research. Holistically, these
methods have been used and compared. Although the results are almost close to
one another, more sediment load has been produced in PSIAC method. As more
affective parameters are used to cause erosion and produce sediment in PSIAC
experimental model, it is recommended to refer to the results of this method
because they are closer to reality.
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