Fluxes of Suspended Sediment and Dissolved Inorganic Nutrients at the Welu River Mouth in Dry and Wet Seasons in 2014
Abstract
The researchers studied the fluxes of water, suspended sediment and dissolved inorganic nutrients in a tidal cycle at the Welu River mouth during the periods from 13 to 14 February (dry season) and from 13 to 14 August (wet season). The net fluxes of water were directed to the sea in both seasons in the amount of 14.71 million m3/day in dry season and 17.36 million m3/day in wet season. Fluxes of suspended sediment was directed seaward in dry season in the amount of 2,214.45 ton/day, and landward in wet season in the amount of 3,546.73 ton/day, opposed to the flux of water. This may be due to the resuspension of sediment on the sea floor or the coastal erosion of the outer area during the strong southwest monsoon. Fluxes of ammonia were directed seaward in wet season (3.31 kg N/day) and landward in dry season (771.13 kg N/day). There may be sources of ammonia from coastal aquaculture activities outside of the river mouth in dry season. The effect of leaching from the soil resulted in a very high silicate flux in both dry (19,946.24 kg Si/day) and wet seasons (17,882.28 kg Si/day). Fluxes of nitrate with nitrite (130.68 kg N/day) and phosphate (8.59 kg P/day) in dry season were directed landward whereas in wet season were directed seaward (1,346.07 kg N/day and 4.77 kg P/day, respectively) indicating sources from both the land and the sea. The study showed that the Welu River water was affected by dissolved inorganic nutrients from sources within the watershed and offshore. Key words: fluxes of suspended sediment, fluxes of dissolved inorganic nutrients, Welu River, Gulf of ThailandReferences
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the Prasae River mouth in 2010. Burapha Science 18(2), 232-245 (in Thai).
Buranapratheprat, A., Choetchoojun, Y., Kongmaung, N., Intacharoen, P., Kan-atireklarp, S. & Gunboa, V.
(2013b). Dissolved inorganic nutrient fluxes at the Prasae River mouth, Rayong Province in wet and dry seasons in 2010. Burapha Science 18(2), 222-231 (in Thai).
Department of Water Resources - DWR. (2017). Retrived December 5, 2017 from http://mekhala.dwu.go.th/
knowledge.php. (in Thai).
Dyer, K.R. (1973). Estuaries: A Physical Introduction. John Wiley & Sons. Aberdeen.
Grasshoff, K., Kremling, K. & Ehrhardt, M. (1999). Methods of Seawater Analysis 3rd Eds. Weinheim: Wiley-VCH.
Kamolpattana, A. (1996). Main Report on the uses of coastal area in Chantaburi. Coastal Land Development
Office, Land Development Department, Ministry of Agriculture and Cooperatives (in Thai).
Kan-atireklarp, S., Buranapratheprat, A., Yuenyong, S., Komsai, T. & Tainaokong, N. (2015a). Fluxes of
suspended sediment and dissolved inorganic nutrients at the Rayong River mouth in dry and wet seasons in 2013. Burapha Science 20(1), 133-144 (in Thai).
Kan-atireklarp, S., Buranapratheprat, A., Yuenyong, S. & Komsai, T. (2015b). Fluxes of dissolved inorganic
nutrients and suspended sediment at the Chanthaburi River Mouth, Chanthaburi Province in dry and wet seasons in 2013. Proceedings the 7th National Science Research Conference. PY-P-001 (in Thai).
Kan-atireklarp, S., Yuenyong, S., Meesub, B., Buranapratheprat, A. & Meesub, A. (2016). Fluxes of dissolved
inorganic nutrients and suspended sediment at the Trat River mouth, Trat Province in dry and wet seasons in 2014. Proceeding of the 5th Marine Science Conference, 221-228 (in Thai).
Meksamphan, C. Tulyakul, P. & Meksamphan, J. (2003). The distributions of nutrients at the Welu River mouth,
Chantaburi and Trat Province: The estimation of seasonal variations and flow rate to the sea. The 41st Kasetsart University Annual Conference: Fisheries Section, 203 – 210 (in Thai).
Schlitzer, R. (2007). Ocean Data View. Retrived December 5, 2017 from http://odv.awi.de.
Siripong, A. (1981). Physical Oceanography of Estuary. Chulalongkorn. Bangkok (in Thai).
Strickland, J.D.H. & Parsons, T.R. (1972). A Practical Handbook of Seawater Analysis. Fishery Research
Board of Canada, Ottawa.
Zhang, J-Z & Huang., X-L (2011). Effect of temperature and salinity on phosphate sorption on marine sediments.
Environmental Science and Technology 45, 6831 – 6837.
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2018-03-27
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