Evaluation of landslides, accretion circumstance and riverbank slope stability analyses in the Mekong Delta

Abstract

This study presents the current situation of landslides and accretion on the Tien and Hau riverbanks in the Mekong Delta over time. Simultaneously, the riverbank slope stability was assessed and showed some related effects. Statistical methods, combined with field surveys and GEOSlope analysis, were used to assess the circumstances of landslides and accretion. Results show that the most landslides have occurred in the An Giang and Dong Thap areas. In the prior 2015 period, 23 and 7 riverbank sections with frequent landslides were excavated and inventoried on the Tien and Hau rivers, respectively. Meanwhile, 28 and 9 sections where accretion occurred during this period were inventoried on the Tien and Hau riverbanks, respectively. Since 2015, 248 locations of landslides and accretion occurring in the area have been investigated. The study also indicates that the displacement of active tectonic faults and instability of riverbank slopes have been demonstrated and complemented the landslide causes in the area. These results are intended to warn and help local authorities to promptly take positive measures to prevent and orient appropriate socio-economic development for the region.