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Free keywords:
Vietnam mean sea surface
Vietnam seabed topography
National mean dynamic topography model
Water depth measurement
MDTVN22
Abstract:
The mean sea surface in different regions is non-equipotential, rendering Vietnam’s traditional
approach, which relies on the Hon-Dau tide gauge station as a reference, not yet scientifically
invalid. To overcome this, our study utilized the Vietnam national mean dynamic topography
model (MDTVN22) for depth observations, particularly in the Gulf of Tonkin. Covering 3430
monitoring sites in Hai Phong and 813 sites in Quang Ninh, our experiments highlighted a 5 to
6 mm difference between the mean sea surface and MDTVN22 references.
• Our research establishes a resilient methodology, integrating shore tide gauge station data
and the MDTVN22 model, aimed at enhancing precision in depth observations.
• Validation experiments in Hai Phong demonstrate a minimal discrepancy of ±0.006 m be-
tween measurements obtained from the traditional mean sea surface and the MDTVN22
model.
• These findings underscore the significance of adopting the MDTVN22 model for improved
accuracy in assessing Vietnam’s seabed topography.
