Scholarlink

<p>Riverbank erosion and lateral channel migration are pervasive processes in alluvial valleys, often triggering rapid and uneven reconfiguration of floodplain land resources. In this study, we quantify fifty years (1973–2023) of planform adjustment of the Torsa and Kaljani rivers and assess the associated land use land cover (LULC) responses within the Torsa-Kaljani interfluve using multi-temporal remote sensing and GIS-based analyses of channel width variation, bank-line shift, erosion-accretion patterns, and LULC transitions. Spatio-temporal migration metrics reveal pronounced asymmetry and hotspot behaviour, as the Torsa River shows its strongest left-bank displacement at Cross Section (CS) 34, reaching 2085.40&#xa0;m during 1991–2023, while the Kaljani River records its maximum right-bank retreat at CS 36 (763.24&#xa0;m) during 1973–1991, indicating reach-dependent phases of instability. Erosion deposition mapping further demonstrates that channel movement has directly translated into differential land loss and gain across the interfluve, with the most severe erosion concentrated in Reach-2 of the Torsa River where 391.48&#xa0;ha were removed over the study period, disproportionately affecting agricultural parcels located along actively eroding banks. In parallel, dense vegetation and forest cover declined markedly, with pronounced transformation along the Kaljani corridor especially Reach-4 where erosion and compensating deposition jointly reshaped the riparian landscape and altered land-cover composition.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Assessment of lateral migration of river and its impact on the land use land cover of the Torsa Kaljani interfluve region, West Bengal, India

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月28日

查看全文
  • Amit Sarkar,
  • Deepak Kumar Mandal,
  • Debasish Mandal,
  • Kunal Chakraborty

摘要

Riverbank erosion and lateral channel migration are pervasive processes in alluvial valleys, often triggering rapid and uneven reconfiguration of floodplain land resources. In this study, we quantify fifty years (1973–2023) of planform adjustment of the Torsa and Kaljani rivers and assess the associated land use land cover (LULC) responses within the Torsa-Kaljani interfluve using multi-temporal remote sensing and GIS-based analyses of channel width variation, bank-line shift, erosion-accretion patterns, and LULC transitions. Spatio-temporal migration metrics reveal pronounced asymmetry and hotspot behaviour, as the Torsa River shows its strongest left-bank displacement at Cross Section (CS) 34, reaching 2085.40 m during 1991–2023, while the Kaljani River records its maximum right-bank retreat at CS 36 (763.24 m) during 1973–1991, indicating reach-dependent phases of instability. Erosion deposition mapping further demonstrates that channel movement has directly translated into differential land loss and gain across the interfluve, with the most severe erosion concentrated in Reach-2 of the Torsa River where 391.48 ha were removed over the study period, disproportionately affecting agricultural parcels located along actively eroding banks. In parallel, dense vegetation and forest cover declined markedly, with pronounced transformation along the Kaljani corridor especially Reach-4 where erosion and compensating deposition jointly reshaped the riparian landscape and altered land-cover composition.