Investigation of landslide deposition in Chaviz watershed

Asgari, Shamsollah; Ghanavati, Ezatollah; Shadfar, Samad

doi:10.22111/jneh.2018.19758.1233

Investigation of landslide deposition in Chaviz watershed

Document Type : Research Article

Authors

¹ Soil Conservation and Watershed Management Research Department, ILAM Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), ILAM, Iran

² Associate Professor of Geomorphology, Faculty of Geographical Sciences, Kharazmi University, Tehran, Iran

³ Associate Prof, Soil Conservation and Watershed Management Research Institute (SCWMRI), Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

10.22111/jneh.2018.19758.1233

Abstract

The problem of soil waste and information is from the sediment load of the rivers. How to calculate landslide sedimentation in landslide basins. In this research, landslide lands of the ILAM dam basin were identified with the aim of quantitative estimation of landslide load using satellite imagery, Google Earth, and field analysis. The discharge data of the sediment was investigated. Using the method of daily discharge, the suspended sediment load and specific sediment were estimated during the existing statistical period and the sediment peaks were determined. The time of occurrence of landslides was adapted to the sediment yield of the statistical period. The average observed sediment in the non-slippery (sub-basin) sub-basin was 0.9 tons per hectare per year in the Chavez subzone of 10.4 tons and below The GOLGOL basin is estimated to be 18.8 tons per hectare. This trend follows a meaningful linear relationship. Using mathematical relations, an 85 percent increase in sediment yields in the sub-basin of Chavez land with an average of 36,510,800 tons during the statistical period is desirable, coincidence The occurrence of landslide with sedimentary peak shows the effect of a landslide on sediment load. Considering the significance of the linear relationship between elevation of landslide and increasing sediment in sub-basins, with a confidence coefficient of 76 percent. The results of the calculation of the average sediment recorded at CHAVIZ Station during the period, which is 146336 thousand tons, is about 130,000 tons due to landslide and 15,000 tons of outflow sediment in normal mode compared with the non-landslide control sub-basin. With these calculations, about 75 percent of the sediments in the ILAM province watersheds, which account for more than 1 percent of the landslide, is related to landslides.

Keywords

References

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