Experimental Study of Gully Erosion in Cohesive Soil with Consolidation and Sandy Layer

Document Type : Research Paper


1 PhD of Hydraulic Structure, Department of Water Sci. and Eng., Science and Research Branch, Islamic Azad University, Tehran, Iran..

2 Professor, Faculty of Water and Environmental Engineering, Shahid Chamran University of Ahvaz, Ahvaz,Iran.

3 PhD of Hydraulic Structures, Head of River and Coastal Eng., Iran Water and Power Development Company, IWPCO.


Gully erosion causes a drop in the channel bed, widening the channel and transporting a large amount of sediment downstream. Understanding the effects of various factors such as soil consolidation and the placement of the sandy layer on sediment transport rate are the goals of this research. Therefore, five samples of cohesive soils with various percent of clay and silt with short- and long-term consolidation were tested under natural conditions. Moreover, in one test, a sandy layer was laid on the gully bed to study the effects of this layer. Results indicated gully migration to upstream occurred at angles closer to 90 degrees when the percent of clay was raised. The same reduction in clay amount in long- and short-term consolidation caused the total gully migration and amounts of sediment to increase 2.5 times in long-term compared to short-term consolidation. The effect of clay reduction was more pronounced in the sample with long-term consolidation.


Main Subjects

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Volume 44, Issue 3
November 2021
Pages 117-128
  • Receive Date: 31 October 2018
  • Revise Date: 06 September 2019
  • Accept Date: 11 September 2019
  • Publish Date: 23 September 2021