Transport and dilution of fluvial antibiotic in the Upper Gulf of Thailand.

A three-dimensional hydrodynamic-antibiotic model is developed to investigate the transport and dilution of sulfamethoxazole (SMX) in the Upper Gulf of Thailand (UGoT). The simulation produced a spatially averaged annual mean SMX concentration of 0.58 μgm, which varied slightly between seasons assuming a temporally constant river SMX loading observed in August.