Fluxes of Suspended Solid and Dissolved Inorganic Nutrients at the Kham Noo River Mouth, Chanthaburi Province in Dry and Wet Seasons in 2015
Abstract
The fluxes of water, suspended solid, and dissolved inorganic nutrients during a tidal cycle at the Kham Noo River Mouth, Chanthaburi Province were investigated during the dry season between 20 – 21 April and during the wet season between 8 – 9 October 2015. It was found that the net water flux flowed into the river during the dry season (2.71 × 106 m3/day) and into the sea during the wet season (0.59 × 106 m3/day). The suspended solid, ammonia, and silicate fluxes flowed toward the sea in both seasons, with fluxes in the dry season being much lower than those in the wet season. The nitrite, nitrate, and phosphate fluxes tended to flow into the river in the dry season and to the sea in the wet season as well as the seasonal variations in water flux. However, the fluxes flowing into the river were much lower than those flowing into the sea. The results show that the source of these substances was from within the river rather than from the sea. Suspended solid and silicate fluxes that were larger than other fluxes, especially during the wet season, may be the result of the leaching from decay and erosion of the land, coast, or water bottom. Nitrogen nutrient fluxes out to the sea were considerably greater than phosphorus fluxes, which may indicate a source occurring in the watershed, i.e., agricultural residues, and the excretion or degradation of wastes from aquaculture or community sources. Compared to other rivers in the eastern region, all fluxes of Kham Noo River were lower than most others.References
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