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<p>In the present study, physical model experimental investigation was conducted to evaluate the stability of riverbanks under different fluvial conditions. Model banks were prepared in a prefabricated flume using silty clay soil collected from the river site and tested under controlled hydraulic conditions. A total of 144 laboratory tests were performed to examine the influence of slope geometry, moisture content, drawdown rate, and drawdown ratio on the stability of the bank in terms of the factor of safety and depth of failure. The results showed that the factor of safety decreased significantly with an increase in drawdown ratio, while the effect of drawdown rate was comparatively less. Lower moisture content resulted in higher susceptibility to instability due to a reduction in shear strength during drawdown. Steeper slopes exhibited greater instability and larger failure depths. Failure mechanisms observed in the experiments were consistent with field conditions and were characterized by seepage-induced erosion and rotational sliding. The study demonstrated that drawdown ratio and slope geometry were the dominant parameters controlling riverbank stability. The findings revealed failure mechanisms and may assist in predicting instability and designing appropriate protection measures under similar hydraulic conditions.</p>

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Analysis of Geo-Fluvial Parameters Affecting Riverbank Stability through Physical Model Study

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Supia Khatun,
  • Mohsin Jamal,
  • Md. Raghib Adil,
  • Ambarish Ghosh,
  • Yogendra Tandel,
  • Viral Patel

摘要

In the present study, physical model experimental investigation was conducted to evaluate the stability of riverbanks under different fluvial conditions. Model banks were prepared in a prefabricated flume using silty clay soil collected from the river site and tested under controlled hydraulic conditions. A total of 144 laboratory tests were performed to examine the influence of slope geometry, moisture content, drawdown rate, and drawdown ratio on the stability of the bank in terms of the factor of safety and depth of failure. The results showed that the factor of safety decreased significantly with an increase in drawdown ratio, while the effect of drawdown rate was comparatively less. Lower moisture content resulted in higher susceptibility to instability due to a reduction in shear strength during drawdown. Steeper slopes exhibited greater instability and larger failure depths. Failure mechanisms observed in the experiments were consistent with field conditions and were characterized by seepage-induced erosion and rotational sliding. The study demonstrated that drawdown ratio and slope geometry were the dominant parameters controlling riverbank stability. The findings revealed failure mechanisms and may assist in predicting instability and designing appropriate protection measures under similar hydraulic conditions.