شناخت عوامل موثر زمين لغزش در حوضه آبخيز سد برنجستانك قائمشهر

The recognition of effective factors Land slide in Watershed, Branjastanak dam, Ghaemshar

Landslide is a natural hazard that it has damage of financial and human lives in per years. This phenomena In Northern zone of Iran in recent years has increased by changes land use and convert of forest area to Agriculture lands and roads. It seems that for decrease of landslide hazards in this area is distance take of this area. Watershed of Branjastanak dam with equal area of 37 kilometer square in 13 kilometers of southwestern of Ghemshar in mazandran. It has two rotation type lands slide in 100 meter distance with North area of dam with 6000 square meter in First mass land and 4000 square meter Area in second mass land. The aim of this paper is recognition of important factors of this land slide on Branjastanak dam. The research method has used from descriptive -analytics method with uses of fieldwork observation. The result of this paper has shown that for these land slide masses, factors of litho logical, geologic, tectonic factors (active factor) with quaternary sediment ( Clay, shell, Marl sediment of Miocene era)has influenced in occurring of landslides