Soil Mechanical Characteristics of Debris Flow Source Areas
Abstract
Debris flow occurrence in mountain watersheds is in need of large amounts of sediment that is usually supplied by shallow land slides. A study of unstable slope as well as safety analysis is one of the important ways in debris flow hazard assessment. In this study which was carried out in Ziarat watershed, Gorgan, it was found out that (according to geomorphologic unit work) bank erosion unit work plays the main role in sediment supply from Tolboneh subwatershed. Soil mechanic analysis was carried out with soil sampling done in the unstable slope in bank erosion unit work. Safety factor (F) analysis indicated that in all samples F was less than one. Clay mineral determination was done using XRD test. The dominant clays in all samples were Ilite and Chlorite, with kaolinite as negligible
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