Evaluation of River Bank Stability against Erosion and Management Practices of Taleghan River Bank Using LIN Method

Document Type : Research Article

Authors

1 MSc Student in Physical Geography, Faculty of Earth Sciences, Shahid Beheshti University, Tehran, Iran

2 PHD Student in Physical Geography, Faculty of Earth Sciences, Shahid Beheshti University Tehran, Iran

3 Associate Professor, Department of Physical Geography, Faculty of Earth Sciences, Shahid Beheshti University Tehran, Iran

Abstract

Erosion and sediment transport are the important hydrodynamic processes in drainage basins that can affect many hydraulic and hydrologic systems such as rivers, beaches, ports, dams, bridges, roads, and farms. One of the most important sediment sources in Iran drainage basin is bank channel erosion that causes on-site and off-site effects. Therefore, investigating of channel/river band instability is necessary for engineering activities to stabilize the riverbank against bank erosion. Thus, the main objectives of this study were to investigate the instability coefficient of the Taleghan River and to find the engineering solution for its stabilization by using the Lin model. In view of this, all required parameters comprising slope, shear stress, slope angle, and satiability coefficient of grain are measured using filed study and Google earth imagery. Finally, bank satiability coefficient and effective rock size for revetment besides the riverbank is obtained in the study area. According to the results, the highest amount of bank erosion and consequently (0.0002,0.0001), the lowest stability coefficient and the largest stone at the threshold (0.33, 0.48) and effective on revetment are related to the 4th section. The lowest amount of erosion, as a result, the highest range of stability coefficient (0.002,0.017) and smallest stone at the threshold (0.75, 0.95) and effective on revetment is related to the 1st section. The main reason could be the size of the grain size on the side, the slope of the basin, slope aside and bank full discharge width. Depending on the location of the area, the best way to prevent bank erosion is to create rip rap on the sides of the high erosion.

Keywords

References

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Iranian journal of Ecohydrology
Volume 7, Issue 1
April 2020
Pages 111-119

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History

  • Receive Date: 06 November 2019
  • Revise Date: 11 February 2020
  • Accept Date: 11 February 2020
  • First Publish Date: 20 March 2020
  • Publish Date: 20 March 2020

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