Tidal flats, a type of coastal wetland, play an important role by providing space for socioeconomic development, various resources, and high biodiversity. Connected to the mainland, tidal flats are affected by both human activities and natural processes, which cause erosion, accumulation of pollutants, and loss of biological resources. Studying the sediments of tidal flats can provide details of natural phenomena and human activities as key factors to understand sedimentary processes and human impacts.
Fraction of tidal flat at both sides of Bach Dang estuary is the fine sand-silt shape which is created by the interaction between river and tidal currents. Plentifully nutrient resources are discharged from continent brought to the estuary by medium-speed tide contribute to advantage condition for growth of hard clam. With the unique characteristics of hydro chemical and current, process of hard clam (Meretrix lyrata) hatchery have different properties in compare with other areas such as size of seed hard clam, period of growth, point of beginner. The rule of development of the hard clam is formulated as y (months old) = H e 6636. 2 0.0386 5.5676 , with H height (cm). It means that their stages of development were strongly affected by local environmental variables.
Processes related to self-purification of Thi Nai lagoon has been studied in-situ and in laboratory in rainy season (October, 2013) and in dry season (May, 2014). Studied results shows that the capacity of self-purification of Thi Nai lagoon is quite good in rainy season, and the dominated process is material exchange. In dry season, due to the weak of material exchange, there is the accumulation of pollutants in water body, especial for nitrite, ammonium and phosphate. The studied results also indicate that the main processes that dominate the self-purification of Thi Nai lagoon are materials exchange, sedimentation, dispersion, decompose, and photosynthesis, respectively. The pollution loads discharged everyday into the Thi Nai lagoon is high, reducing the self-purification of lagoon, therefore it need to be controlled restrict.
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