Management of Nitrate Loading in the Chao Phraya Estuary
Nitrate loading in the Chao Phraya estuary, derived primarily from agricultural waste, is considered to be the most significant factor in causing oxygen depletion. In order to maintain appropriate levels of dissolved oxygen in the estuary control of nitrate loading is required. This paper describes a simulation model of nitrate dispersion in the Chao Phraya estuary, which allows the normalized nitrate distribution over the estuary in the dry season to be determined. By introducing a number of fictitious nitrate loadings at the upper boundary, the distribution of dissolved oxygen in the estuary is obtained. Further by employing the limiting level of dissolved oxygen at 2 mg/1 (the survival limit of biota), the pattern of allowable nitrate loading is elaborated.
KeywordsDissolve Oxygen River Mouth Tidal Cycle Dispersion Coefficient Nitrate Content
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