Sensetivity of geologic formations to erosion in Chandabe basin of Varamin
2004
Feiznia, S., Prof. of Natural Resources Faculty, Tehran University | Sharifi, F., Associate Prof. and Member of Scientific Board of Soil Conservation and Watershed Management Research Center | Zare, M., High Expert, Studying and Eval uation Bureau of watersheds, Forests, Rangelands and watershed Management Organization
Sensitivity of geologic formations to erosion has important role in sediment yield of catchments. Field investigation indicates that a high percentage of sediment can originate from a small part of the catchment.This research has been carried out in two parts. 1- Investigations in Chandabe basin of Varamin as follows: River longitudinal profile , drainage patterns, k coefficient(in USLE model), of formations , area percentage or marl, area covered by different formations. 2- Investigation in flood spreading area including suspended sediment and permeability of the land.The sensitivity of formations to erosion was determined based on the above investigations as follows: Upper Red Formation is the most susceptible to erosion .Lower Red is highly susceptible to erosion . Hezar Dareh Formation , Tehran alluvium and most parts of Karaj Formation have medium susceptibility and Karaj Formation in highlands is resistant formation to erosion.Keywords: Sensitivity to erosion, erodibility, Chandab Basin, Varamin, Iran
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