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<p>This experimental study investigates the performance of high-density polyethylene (HDPE) geobags as a sustainable riverbank protection measure under varying hydrodynamic conditions. A scaled-down riverbank model was tested in a prefabricated flume. The experiments evaluated the effectiveness of HDPE geobags in two placement patterns (staking bond and running bond) with three filling percentages (65%, 75%, and 85%) under flow velocities of 0.4&#xa0;m/s, 0.6&#xa0;m/s, 0.8&#xa0;m/s, and 1.0&#xa0;m/s. A total of 48 trials were conducted to analyse displacement of geobags, erosion resistance, and shear strength. Results demonstrated that HDPE geobags significantly reduced riverbank erosion, preserving 85–95% of the model bank cross-sectional area compared to unprotected banks. The running bond exhibits the good interlocking as compared to staking bond. Higher filling percentages (85%) further improved performance, minimizing bag displacement and maintaining shear strength under increased flow velocities. Shear strength measurements revealed that protected banks retained higher strength (up to 13.05&#xa0;kPa) compared to unprotected banks (6.51&#xa0;kPa at 1.0&#xa0;m/s), emphasizing the geobags’ ability to mitigate erosion. The study identified 82.5% filling as optimal for maximum stability and minimum internal erosion of in-fill material within the HDPE geobags, particularly in bank exposed with high velocity. These findings highlight the efficacy of HDPE geobags as a cost-effective, eco-friendly solution for riverbank protection, with the running bond arrangement and higher filling percentages recommended for enhanced durability and erosion resistance.</p>

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Experimental Evaluation of HDPE Geobags for Sustainable Riverbank Protection

  • 期刊论文

  • 发表日期：

    2025年8月2日

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  • Md. Raghib Adil,
  • Supia Khatun,
  • Mohsin Jamal,
  • Ambarish Ghosh

摘要

This experimental study investigates the performance of high-density polyethylene (HDPE) geobags as a sustainable riverbank protection measure under varying hydrodynamic conditions. A scaled-down riverbank model was tested in a prefabricated flume. The experiments evaluated the effectiveness of HDPE geobags in two placement patterns (staking bond and running bond) with three filling percentages (65%, 75%, and 85%) under flow velocities of 0.4 m/s, 0.6 m/s, 0.8 m/s, and 1.0 m/s. A total of 48 trials were conducted to analyse displacement of geobags, erosion resistance, and shear strength. Results demonstrated that HDPE geobags significantly reduced riverbank erosion, preserving 85–95% of the model bank cross-sectional area compared to unprotected banks. The running bond exhibits the good interlocking as compared to staking bond. Higher filling percentages (85%) further improved performance, minimizing bag displacement and maintaining shear strength under increased flow velocities. Shear strength measurements revealed that protected banks retained higher strength (up to 13.05 kPa) compared to unprotected banks (6.51 kPa at 1.0 m/s), emphasizing the geobags’ ability to mitigate erosion. The study identified 82.5% filling as optimal for maximum stability and minimum internal erosion of in-fill material within the HDPE geobags, particularly in bank exposed with high velocity. These findings highlight the efficacy of HDPE geobags as a cost-effective, eco-friendly solution for riverbank protection, with the running bond arrangement and higher filling percentages recommended for enhanced durability and erosion resistance.