Document Type : Research Paper
Authors
1
Department of Physical Geography, Faculty of Earth sceince Science, University of Shaheid Beheshti, Tehran, Iran.
2
Department of Physical Geography, Earth science Science, University of Shaheid Beheshti, Tehran
3
Department of Physical Geography, Earth sceince Science, University of Shaheid Beheshti, Tehran, Iran.
10.22092/ijsr.2024.366332.752
Abstract
A significant issue in applied research for the management of watersheds is to know the integrated sediment yield process in watershed. In the recent decades, sediment fingerprinting method was proven as one of the key methods for determining contribution of sediment proportion. This study's purpose was to determine the relative source contribution of surface (forest, pasture, agriculture and gardening) and sub-surface (bank erosion) in sediment yield by using weathering indices in Chehel-Chaye Catchment, Golestan Province, Iran. In eight flood events, suspended sediment sampling was done in March to April 2021. Thirty-six weathering indices were calculated. After Bracket, Kruskal-Wallis, and Discernment Function Analysis, CPA,ALK, MgIndex, ba1, CALMAG Index had the highest discernment percentage in all of the tracers. Based on Bayesian mixing model, the highest proportion of suspended sediment was produced by agricultural land (88/6%), followed by pasture (4/1%), forest (2/3%), and bank erosion(5%) of the suspended sediment. Thus, knowing the high contribution of agriculture in sediment yield, it is necessary to design and implement soil conservation operations according to the location of the watershed.
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