Sediment Oxygen Demand in the Yuancun Reach of the Pearl River in Guangzhou
珠江广州河段员村段的底泥耗氧

The physical properties, characteristics of oxygen demand, proportions of chemical oxidation and biological respiration in the total oxygen demand of sediments from the Yuancun Reach of the Pearl River in Guangzhou, were studied in laboratory during mean water and high water seasons. Results indicate that the sediment only consumed oxygen initially over the first six hours in mean water season, while in high water season,.the sediment continuoeusly consumed oxygen at a comparatively low rate. It is doubt less that chemical oxygen demand plays a main role in toeal oxygen demand in both hydrological seasons. At the same temperature and water flow rate, the rate of sediment oxygen uptake in high water season is significantly higer than that in mean water season. In addition, the rates of sediment oxygen demand are related to the temperature and flow rate and their equations are:SODM=0.4945×1.0058(T-20), SODH= 0.6155×1.0234(T-20), SODM=0.1623×1.0912, SODH=0.2393×1.0857.