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Abstract
Clam grounds belong to Rang Dong Cooperative in Thoi Thuan Commune, Binh Dai District, Ben Tre Province, which is considered the largest clam seed deposit in the Mekong River Delta as well as in the whole country. The morphological characteristics of Thoi Thuan tidal flats with their distinct characteristics have created favorable conditions for the formation of huge clam seed fields in this area. By a new technical approach to using multi-temporal remote sensing images, the topography - morphology of Thoi Thuan tidal flat has been established based on a dataset of waterlines taken at different times. The method “Reconstruction the topography of tidal flat from multi-temporal remote sensing image dataset” has great accuracy and high reliability (R2 = 0.8907 và RMSE = ± 0.151 m). The topographical maps of Thoi Thuan tidal flat in 2003, 2007, 2010, 2014, 2017 and 2021 has been reconstructed by the above mentioned method. Quantitative analysis results from the topographical maps of Thoi Thuan tidal flat in different periods have shown the trends of area expansion and strong accretion of tidal flat over time. Locations of clam seed fields, the causes of the decrease in clam seed production in recent time have also been discussed in detail in this article.