title: Oxygen deficit determinations for a major river in eastern Hong Kong, China.
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 degrees C (the lowest temperature in the river), no deficit was observed. When water temperature was 10 degrees C to 20 degrees C, a small oxygen deficit appeared, especially in the deeper water. At the highest water temperature (30 degrees C), the oxygen deficit was maximal, -6.84 g O2/m2/day, in the night-time during the Spring tide period.
authors.affiliation: Department of Civil Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong SAR, People's Republic of China.
authors.forename: G H
authors.initials: GH
authors.lastname: Chen
authors.forename: I M
authors.initials: IM
authors.lastname: Leong
authors.forename: J
authors.initials: J
authors.lastname: Liu
authors.forename: J C
authors.initials: JC
authors.lastname: Huang
authors.forename: I M
authors.initials: IM
authors.lastname: Lo
authors.forename: B C
authors.initials: BC
authors.lastname: Yen
mesh_terms: D004784:Environmental Monitoring; D056890:Eukaryota / Q000378:metabolism*; D019015:Geologic Sediments / Q000737:chemistry; D006723:Hong Kong; D010100:Oxygen / Q000032:analysis / Q000378:metabolism*; D010788:Photosynthesis; D013696:Temperature; D014876:Water Pollution / Q000032:analysis*
chemical_list: D010100:Oxygen