Abstract
Determination of oxygen deficit in the Hong Kong Shing-Mun River was based on the oxygen uptake by water, algal respiration and river sediment and the oxygen supplied to the river by surface reaeration and algal photosynthesis. A systematic study was conducted to examine the effect of water temperature, flow velocity and water depth on both the oxygen demands and the oxygen supplies. The oxygen budget of a water column in a selected section of the river was modeled. The results of the oxygen budget analysis showed that when water temperature was around 10°C (the lowest temperature in the river), no deficit was observed. When water temperature was 10°C to 20°C, a small oxygen deficit appeared, especially in the deeper water. At the highest water temperature (30°C), the oxygen deficit was maximal, −6.84 g O 2/m 2/day, in the night-time during the Spring tide period.
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