Investigation Of Gully Erosion In Marly Agha-Jari Formation In Zagross (Case Study: Ghasre-Shirin, Kermanshah)
2007
Feiznia, S. | Heshmati, M. | Ahmadi, H. | Ghodosi, J.
Gully erosion is one of prominent erosion processes of marly and soluble formations with low topography. Due to being widespread and having diverse lithology, Agha-Jari marly formation is more important in Zagros in this respect. Agha-Jari Formation is present in the studied area and is under gully erosion. This research is performed bosed on geomorphology method and by considering all effective factors in erosion,photograghical investigation and by integration of geology,slope,aspect,hypsometry and erosion feature maps. In each homogenous land units, chemical and physical analysis of soils and formation and determination of clay mineral types were performed.Gully erosion facies of Agha-Jari formation was studies according to the type of spread, cross section shape and number and density of gullies and gullies were classified according. the relationship between slope and gully dendity was studied statistically. Finallerosion intensily and sediment yield of gully erosion facies was investigated by MPSIAC Method. The results of study have shown that the amount of total lime is%35.2,gypsum %42.35 meq/100gr,organic carbon%0.42.the type of clay minerals from more to less abundant are:montmorillonite, illite and chlorite.V-shaped and U-shaped gullies are present, V-shaped being more abundant. %74of gullies are in high density and %26 in medium density class. Most of gullies are of digitate type. The correction coefficient between slope and V-shaped gullies density is %83 with coefidence level of %95 and between slope and U-shaped gullies density is %80 with coefidence level of %99. Gullies are present in slope of %2to%10 .Erosion intensity of gully facies is high and sediment yield is 24.7ton/ha/year.
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