Researchers at Nagaland University have advocated a geospatial technology-driven approach to combat soil erosion across the hilly regions of Northeast India, the university announced on Wednesday, 6 May. Their study, published in a peer-reviewed Springer Nature journal, uses satellite-based modelling to identify erosion hotspots and recommend targeted conservation measures across the region's vulnerable watersheds.

The Erosion Crisis in the Eastern Himalayas

Soil erosion has emerged as a serious environmental and ecological threat across the eastern Himalayan region, degrading agricultural productivity, straining water resources, and disrupting ecological balance. The problem is compounded by steep slopes, high-intensity rainfall, deforestation, and unscientific land use — including shifting cultivation, mining, and rapid infrastructure development. Researchers warn that without structured intervention, land degradation will accelerate as climate pressures and human activity intensify.

What the Study Examined

The research focuses on the Siji watershed, located within the Gai River Basin in Assam — one of the most erosion-prone sub-regions in the Northeast. Using the Revised Universal Soil Loss Equation (RUSLE) integrated with GIS-based modelling, the team assessed soil erosion and sediment transport by analysing rainfall intensity, soil characteristics, slope gradients, land use patterns, and conservation practices. The watershed-based approach enables micro-level identification of erosion hotspots, allowing planners to prioritise high-risk zones rather than applying uniform solutions.

The research paper was co-authored by Prof. M. S. Rawat, Department of Geography, School of Sciences, Nagaland University, alongside research scholar Tulumoni Gogoi and Dr Pradeep Kumar Rawat, Consultant Professor, Asian International University, Manipur.

Key Findings

The findings reveal that areas with dense forest cover and gentle slopes experience minimal erosion, while regions with steep slopes, croplands, barren land, and human disturbances — such as road construction and mining — face significantly higher risk. In some zones, erosion rates were found to be extremely high, posing serious threats to land stability and local ecosystems. The spatial data layers integrated into the model can also quantify soil loss across micro-level units within the watershed, making prioritisation of interventions far more precise.

What the Researchers Recommend

Elaborating on the study's proposed solutions, Prof. Rawat said: "We recommend an Integrated Watershed Management (IWM) approach. This includes developing sustainable land use plans and implementing mechanical and biological measures such as contouring, terracing, and vegetation cover to reduce soil loss and improve water management." The model is also designed to guide policymakers in making informed decisions on land use and conservation. The researchers note that the framework can be adapted for other regions with similar geographical and environmental conditions, both within India and globally.

Institutional Backing and the Road Ahead

Nagaland University Vice Chancellor Prof. Jagadish K. Patnaik described the study as "a significant step towards addressing one of the most pressing environmental challenges in Northeast India." He said integrating geospatial technology can effectively guide conservation efforts, reduce soil degradation, and promote sustainable land use. The research also flags the need for future work, including flood prediction models and improved monitoring systems. Given the growing impact of climate-related factors and human activity, the team stressed that timely intervention is crucial to prevent further environmental degradation across the region.