تحلیل نقش مارن ها در تولید رواناب و رسوب در استان اردبیل

Considering the significant expansion of marl units in the watershed area of Ardabil province and the occurrence of soil erosion, it is necessary and necessary to know marls from the point of view of the volume of runoff and sediment produced, which ultimately leads to providing solutions for their containment and reduction. In this research, the relationship between marls erosion forms and its rate with their physical and chemical properties were investigated. 29 treatments were conducted using a drop maker rainfall simulator device (with rainfall levels of 1 m×1 m) with the intensity 20 mm/ h for the duration of 30 minutes, and the start time of runoff, the amount of runoff, sediment concentration and soil loss rate were measured. The runoff start time, runoff volume, mud pollution and soil losses were measured. Then, the obtained data were analyzed using different statistical methods, including variance analysis and mean comparison. The obtained results show that at a slope of less than 2% runoff starts earlier than at higher slopes. The start time of runoff in the rock unit with the combination of conglomerate and marl, colored clays, sandstone and shale (OM) decreases and increases in the unit with the combination of marl and gypsum clay silt (M). Although, with the change of lithological units, there has not been a significant change in the amount of sediment of the runoff, but two groups of areas with rill and gully erosion can be separated from each other.