Morphological changes at Nhat Le estuary under hydro-meteorological influence

Nhat Le estuary is located on the Central coast of Viet Nam, where it always has strong morphological changes under the influence of seasonal changing dynamic factors.Based on the analysis of shoreline and topography data, the article presents some assessments on the relationship between hydro-meteorological conditions and changes in the morphology of the Nhat Le estuary.The assessment results show that: (1) The seasonal variation of wave and river discharge factors have a strong impact on morphological changes in the Nhat Le estuary.Width of river mouth and "arrow-shaped" sandspit on the southern bank of the estuary are affected by the river discharge factor, while the main channel and sandbar of the estuary are strongly affected by the wave factor; and (2) This has led to the creation of a general diagram depicting the morphological change cycle of the Nhat Le estuary under the influence of wave and river flow factors.The research results will contribute to further clarifying the causes and trends in the morphological development and providing crucial information for proposing solutions to stabilize the Nhat Le estuary.