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