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<p>Bends are typically the most unstable sections of a river, where river bend erosion occurs due to secondary currents caused by centrifugal forces. Submerged vanes provide an effective technique for reducing river bend erosion, as they efficiently suppress secondary current induced flow alternations within the bend section. Previous field installations have largely focused on rectangular vane, while alternative vane shapes received limited attention. The objective of the present study is to examine the effectiveness of beveled submerged vanes in reducing erosion along the outer bank of the Ganga river reach located downstream of the Vikramshila Bridge from Bhagalpur to Ismailpur, Bihar, India. Historical images indicate that the main course of the Ganga River reach migrated toward the outer bank by approximately 4&#xa0;km between 1985 and 2024. The study conducted a scaled physical model of the Ganga River reach corresponding to 25%, 50%, 75%, and 100% of the maximum discharge under existing and installed vane conditions. The findings indicate that the main course of the river and high-velocity zone flowing along the bend are shifted away from the outer bank after the installation of submerged vanes. Furthermore, with installation of the submerged vanes, the percentage reduction in bank erosion is ranging from 63.4 to 100%, from 30 to 100%, and from 15.6 to 79.8% for 0&#xa0;km, 0.14&#xa0;km, and 0.28&#xa0;km offsets from the outer bank. Moreover, the installation of these vanes along the outer bank of the river model demonstrated effective in reducing bank erosion at river bends.</p>

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Application of beveled submerged vanes for controlling erosion of the outer bank of Ganga river at Bhagalpur, India

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Anirban Mandal,
  • Subhojit Kadia,
  • Zulfequar Ahmad

摘要

Bends are typically the most unstable sections of a river, where river bend erosion occurs due to secondary currents caused by centrifugal forces. Submerged vanes provide an effective technique for reducing river bend erosion, as they efficiently suppress secondary current induced flow alternations within the bend section. Previous field installations have largely focused on rectangular vane, while alternative vane shapes received limited attention. The objective of the present study is to examine the effectiveness of beveled submerged vanes in reducing erosion along the outer bank of the Ganga river reach located downstream of the Vikramshila Bridge from Bhagalpur to Ismailpur, Bihar, India. Historical images indicate that the main course of the Ganga River reach migrated toward the outer bank by approximately 4 km between 1985 and 2024. The study conducted a scaled physical model of the Ganga River reach corresponding to 25%, 50%, 75%, and 100% of the maximum discharge under existing and installed vane conditions. The findings indicate that the main course of the river and high-velocity zone flowing along the bend are shifted away from the outer bank after the installation of submerged vanes. Furthermore, with installation of the submerged vanes, the percentage reduction in bank erosion is ranging from 63.4 to 100%, from 30 to 100%, and from 15.6 to 79.8% for 0 km, 0.14 km, and 0.28 km offsets from the outer bank. Moreover, the installation of these vanes along the outer bank of the river model demonstrated effective in reducing bank erosion at river bends.