Fluxes of Dissolved Inorganic Nutrients and Total Suspended Solid at  the Phangrad River Mouth, Rayong Province During Dry and Wet Seasons in 2015

Suthida Kan-atireklap; Suphachai Yuenyong; Kularbthip Phothong; Paweena Chotchuang; Anukul Buranapratheprat; Supawat Kan-atireklap

Fluxes of Dissolved Inorganic Nutrients and Total Suspended Solid at the Phangrad River Mouth, Rayong Province During Dry and Wet Seasons in 2015

Suthida Kan-atireklap, Suphachai Yuenyong, Kularbthip Phothong, Paweena Chotchuang, Anukul Buranapratheprat, Supawat Kan-atireklap

Abstract

A study on Fluxes of dissolved inorganic nutrients and total suspended solid at the Phangrad River Mouth during dry (April) and wet (September) seasons in 2015 was conducted. The Acoustic Doppler Current Profiler (ADCP) was used to measure water flux in a tidal cycle. The results showed that the net fluxes of water and dissolved inorganic ammonia, nitrite, nitrate and phosphate were directed seaward in both seasons (0.37×10⁶ m³/day, 317.69 kg N/day, 24.35 kg N/day, 30.70 kg N/day and 85.05 kg P/day, respectively, in dry season and 0.59×10⁶ m³/day, 74.28 kg N/day, 22.95 kg N/day, 162.21 kg N/day and 38.43 kg P/day, respectively, in wet season). The net flux of dissolved inorganic nitrate accords with the net flux of water. The net fluxes of dissolved inorganic ammonia, nitrite and phosphate had higher amount in dry season than those in wet season related to their higher concentrations in the previous season. The net flux of total suspended solid was directed to the estuary because of the flowing of resuspended sediment from the coastal area during spring tide. The net flux of dissolved inorganic silicate moved seaward in dry season but riverward in wet season in the same way as those of total suspended solid. Comparison with other rivers in the eastern region of Thailand showed that the net fluxes of ammonia and phosphate at the Phangrad River Mouth were relatively high in dry season.

Keywords: Fluxes of dissolved inorganic nutrients, Fluxes of total suspended solid, Phangrad River

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