Integration of Geospatial Analysis and Field Data for Landslide Risk Mapping at Bau Trang Lake

Abstract

This study evaluates landslide risks in the Bau Trang Lake area, Vietnam, by integrating field data, geospatial analysis, and geotechnical modeling. Bau Trang Lake, a critical ecological and economic site, faces increasing landslide threats driven by hydrogeological dynamics and human activities, particularly unregulated tourism. Using seven thematic maps - geology, topography, slope, soil properties, water permeability, mechanical strength, and land use impacts – this research develops a hazard map categorizing the area into five risk levels: very low, low, medium, high, and very high. High-risk zones, concentrated along the southern and southwestern shores of Bau Ba, are characterized by steep slopes, loose sandy soils, and high water permeability, exacerbated by seasonal rainfall and human-induced soil compaction. The findings highlight the ecological and economic significance of high-risk zones, which include key tourism destinations. To mitigate risks, the study recommends structural solutions like retaining walls and geotextiles, alongside non-structural measures such as reforestation, zoning regulations, and stakeholder engagement. These strategies aim to balance tourism development with environmental conservation, ensuring long-term sustainability. This research provides a replicable framework for landslide risk assessment and offers actionable solutions to support resilience in environmentally sensitive regions.