بررسی برداشت شن، ماسه و مصالح رودخانه ای و لایروبی در بستر و حریم رودخانه ها و مسیل ها بر محیط زیست (مطالعه موردی رودخانه مجن شاهرود)

The uses of sand and gravel have been developed in many fields such as concrete,making mosaic and making glass so far. River`s sand and gravel are good sources of materials. Excavation and sand mining in rivers have the great influences on the behaviour of river
In this research, we have surveyed the effects of sand mining on Mojen Shahroud river in Semnan province. River modeling by HEC-RAS 4.0 revealed that the excavaton accelerates the erosion rate in upstream and downstream of the sand pits. Environmental impacts of sand mining are described in this report. The water quality of Shahroud and Mojen rivers in shahrdari shahroud, shahvar, mozafari and shahrdari mojen sand and gravel`s mines has been reduced by sand mining activities..

بررسی برداشت شن، ماسه و مصالح رودخانه ای و لایروبی در بستر و حریم رودخانه ها و مسیل ها بر محیط زیست (مطالعه موردی رودخانه مجن شاهرود) Keywords:

Mining pits and dredging in Rivers bed , HEC-RAS 4.0 model , Sediment , Shahroud mojen river , Rivers environmental