River Bank Instability Detection and Monitoring Assessment

Articles in Press

Document Type : Original Article

Authors

School of Civil and Water Resource Engineering, Woldia Institute of Technology, Woldia University, Ethiopia.

10.22044/jhwe.2025.15681.1052

Abstract

One principal cause of river bank collapse is the removal of more sediment from stream banks than the system can replenish. This study aims to assess river bank erosion rate and erosion monitoring assessment for about 3 km of the Shelie River. The primary data (more than 20 River Bank and 20 bed materials, 104 river cross-sections were collected using standard surveying equipment. Sieve and hydrometer analysis were implemented. Secondary (metrological) data were collected from an Ethiopian national metrological agency. HEC-RAS model was used to compute the water surface profile and discharge-stage analysis. Additionally, BSTEM model was used to depict river bank migration rate and its stability analysis. BSTEM model result showed that left river banks are retreating laterally on average 0.012 m/hr for considered reach, and overall safety factor is greater than unity. Further, steady state flow simulation results confirmed that conveyance capacity of the considered reach is not enough to carry 50-year return period design discharge and flood inundation raises a maximum of 1.2 m from normal flood level and extends 20 m laterally.

Keywords

Journal of Hydraulic and Water Engineering

Articles in Press, Accepted Manuscript
Available Online from 20 April 2025

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