Refference : The 25th Symposium on Geoscience;Tehran
Publishing Year : 1385

Abstract :

The Fromad Watershed is a part of Central han drainage basin located east of the city of Shahrod in Seaman Province. This watershed has a Mountainous type. Generally geological unit including of Ophiolitic suites and Eocene Volcanic- sedimentary sequence, Conglomerate of Neogen, Marl and Gypsum. The river is a braided type with gravelly bed. Study of erosion and sediment generation in Fromad watershed showed that the eastern parts of this watershed have a higher potential of water erosion than mass movements Because these areas have the following characteristics: (1) a large exposure of Marly and Tuffs profile (2) lack of herbaceous covering and (3) high slope gradient. In the higher gradient slope in central parts of this watershed, the erosion intensity is very low, because the more resistant massive rock. Western parts of Fromad watershed, near the exit point, are covered by Marly-Conglomerate of Neogen and alluvial fans sediments. Therefore, these areas have a high potential of erosion and sediment generation. In conclusion, this study shows that 3 basis factor (lithology, gradient slope and human interferences) have the main role in sediment generation in this watershed.

Subject List : sedimentary basin