Fluxes of Dissolved Inorganic Nutrients at the Pranburi River Mouth, Prachuap Khiri Khan Province
Abstract
The aims of this research are to studied fluxes of dissolved inorganic nutrients, total suspended solid (TSS) and water qualities at the Pranburi River, Prachuap Khiri Khan Province in December 2018, March, June and September 2019. Acoustic Doppler Current Profiler (ADCP) was used to measure water flux. The results showed that the net water flux and net dissolved inorganic nutrient fluxes were controlled by discharge from the Pranburi Dam. The net water fluxes mostly flowed seaward except in December when the net water flux and the net TSS flux flowed riverward for 0.01 x 106 m3/day and 62.59 ton/day, respectively. The largest net fluxes of water, silicate and phosphate occurred in September for 2.01 x 106 m3/day, 4,658.25 kg Si/day and 72.04 kg P/day, respectively, which is the peak of wet season. The net water flux in March was almost similar to that in June by 0.76 x 106 m3/day and 0.85 x 106 m3/day, respectively. Meanwhile, the net fluxes of ammonia and nitrate were largest in March (Dry season) by 276.60 and 220.70 kg N/day, respectively. For the water qualities in Pranburi River it was found that dissolved oxygen (DO) was less than 4 mg/L and ammonia, phosphate and BOD increased when the river water flowing through the urban area.
Keywords : Pranburi River, Water quality, Fluxes of dissolved inorganic nutrients, fluxes of total suspended solid
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