The land stability, agricultural productivity, and watershed management are at risk owing to soil erosion from rill and gully formation. In this study, we used geospatial tools to focus on Mapping Rill and Gully Erosion Hot spots in the Lish and Gish Catchment Using Remote Sensing and GIS, through an investigation of hydrology, relief, and land use to examine possible vulnerability to erosion. The hydrological elements we considered consisted of, rainfall intensity, drainage frequency, drainage density, and stream ordering; analyzed to describe the characteristics of water flow and contribution to erosion. The relief aspects we focused on were, the types of relative relief, dissection index, roughness index, and slope; analyzed to assess the landscape’s vulnerability to rill and gully formation. The land use factors included soil type and vegetation characteristics; subsequently incorporated to relate land cover to erosion controls. To summarize the results, the impact of high rainfall intensity, steep slope, high drainage density, and low order streams were significantly contributing to erosion processes, particularly in the central and western parts of the catchment. Areas of gravelly loamy and loamy skeletal soils exhibited high proportions of erosion, although dense vegetation reduces the risk of erosion. The results have corroborated with previous studies, this study emphasizes the importance of sustainable watershed management, soil conservation, and afforestation programs as soil erosion controls on rill and gully. The present study illustrated the benefits of geospatial tools for monitoring, examining, and management of soil erosion and makes the case for proactively researching erosion dynamics as it relates to climatic change.

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Mapping Rill and Gully Erosion Hotspots in the Lish and Gish Catchment, Darjiling Himalaya Using Remote Sensing and GIS

  • Amit Kumar Jana,
  • Gouri Sankar Bhunia

摘要

The land stability, agricultural productivity, and watershed management are at risk owing to soil erosion from rill and gully formation. In this study, we used geospatial tools to focus on Mapping Rill and Gully Erosion Hot spots in the Lish and Gish Catchment Using Remote Sensing and GIS, through an investigation of hydrology, relief, and land use to examine possible vulnerability to erosion. The hydrological elements we considered consisted of, rainfall intensity, drainage frequency, drainage density, and stream ordering; analyzed to describe the characteristics of water flow and contribution to erosion. The relief aspects we focused on were, the types of relative relief, dissection index, roughness index, and slope; analyzed to assess the landscape’s vulnerability to rill and gully formation. The land use factors included soil type and vegetation characteristics; subsequently incorporated to relate land cover to erosion controls. To summarize the results, the impact of high rainfall intensity, steep slope, high drainage density, and low order streams were significantly contributing to erosion processes, particularly in the central and western parts of the catchment. Areas of gravelly loamy and loamy skeletal soils exhibited high proportions of erosion, although dense vegetation reduces the risk of erosion. The results have corroborated with previous studies, this study emphasizes the importance of sustainable watershed management, soil conservation, and afforestation programs as soil erosion controls on rill and gully. The present study illustrated the benefits of geospatial tools for monitoring, examining, and management of soil erosion and makes the case for proactively researching erosion dynamics as it relates to climatic change.