Landslide Assessment: From Field Mapping to Risk Management. A Case-Study in the Buzău Subcarpathians

Abstract: Landslide risk management represent the final steps within a long process of evaluation that starts with detailed field observation. Based on geomorphological field mapping and the additional support offered by other methods and devices (aerial photos or remote sensing images, GPS and total station surveys, statistical analysis, numerical modelling etc.), landslide susceptibility and hazard assessments offers compulsory information for risk mapping. Unfortunately, there are still papers and even legislative initiatives which skip these important steps, offering results which can be at least severely arguable. The present paper is focusing on highlighting a proper methodology for landslide risk management, having as a case-study a small catchment typical for the Romanian Curvature Carpathians-Subcarpathians contact (Muscel Valley). Within this space of 19.6 km2, the risk management assessment started with detailed geomorphological mapping, providing information for landslide inventory. Based on this inventory, statistical analysis allowed the susceptibility assessment, and through additional information like landslide frequency and magnitude, triggering threshold and its recurrence interval, landslide hazard assessment and mapping were performed. Finally, risk analysis, assessment and management, outlined by a risk map, finished the procedure, aiming to provide useful information for risk governance.