نقش زمین لغزش ها در تولید رسوب حوزه آبخیز کاکاشرف استان لرستان

Summary
Mass movements are a part of natural hazards that directly or indirectly affect all natural and unnatural factors in the watershed. Kakashraf watershed with an area of 19,475 hectares is a part of Karkheh watershed in the south of Khorram Abad city. The cause of outcrop of Tertiary Shale and marl formations, as well as numerous tectonic structures governing this area, climatic conditions, topography and extreme changes in land use in this basin, mass movements in the form of rotational landslides, rock fall and dry debris flow and There is saturated. In this study, the role of sliding masses in sediment production has been investigated.
It was paid in the rains of February 2023. By carrying out field operations and taking samples of running water upstream and downstream of a 25-hectare landslide area at 10-minute intervals and conducting laboratory tests of 3 indicators of total dissolved substances (TDS), sodium absorption ratio (SAR) and water turbidity parameters (NTU) has been measured. The results show that the TDS, SAR, and NTU values in the upstream areas of the slippery mass average 13.19 mg/l of total dissolved substances, the sodium absorption ratio is 2.79 percent, and the water turbidity level is 889 and in the downstream areas of the landslide, these values are 5016.85 mg/l for total dissolved substances, sodium absorption ratio is 14.7% percent and water turbidity is 1535.85.