Author(s): Doan Van Binh; Luc Anh Tuan; Sameh A. Kantoush; Binh Quang Nguyen; Menna Farag Ahmed; Tetsuya Sumi
Linked Author(s): Binh Nguyen, SAMEH KANTOUSH, Tetsuya Sumi
Keywords: Riverbed elevation Bathymetry Riverbed incision Scour hole Vietnamese Mekong Delt
Abstract: The Vietnamese Mekong Delta (VMD) is one of the world’s most important rice-exporting regions but faces several water-related challenges, including severe riverbed erosion. Previous studies primarily relied on cross-sectional bathymetric data from a single-beam acoustic Doppler current profiler (ADCP) to investigate these riverbed changes. However, the distance between two adjacent cross-sections often ranged from hundreds to thousands of meters, leading to potentially low accuracy in the interpolated results. To improve this accuracy, we utilized a multibeam echosounder to measure riverbed elevations along 40 km of the Tien River in the VMD in June 2024. This reliable measurement examined riverbed elevation's spatial variation and determined optimal cross-sectional intervals for bathymetric measurements. The deepest point, located near the right bank, was found approximately 1 km upstream of the My Thuan Bridge, with a water depth reaching nearly 53 meters. Notably, deep scour holes were often found near areas experiencing significant riverbank erosion. This research is a valuable reference for selecting appropriate cross-sectional intervals for future geomorphological studies using single-beam ADCP methods.
Year: 2025