珠江广州河段员村段的底泥耗氧

Sediment Oxygen Demand in the Yuancun Reach of the Pearl River in Guangzhou

探讨广州珠江员村段底泥的耗氧特点及总底泥耗氧中生物耗氧和非耗氧所占比例。结果表明，在实验期间内平水期底泥只出现前６ｈ的持续耗氧过程，而丰水期底泥除出现前６ｈ的快速耗氧外，还表现出相对较缓慢的耗氧过程。两水期底泥耗氧中化学耗氧起主导作用。同温、同流量条件下，平水期的底泥耗氧速率略低于丰水期。由实验推导出两水期底泥耗氧速率与温度及流量之间的关系为：ＳＯＤ丰＝０．４９４５×１．００５８（Ｔ－２０）（Ｔ≤３７℃），ＳＯＤ平＝０．６１５５×１．０２３４（Ｔ－２０）（Ｔ≤３７℃），ＳＯＤ丰＝０．１６２３×１．０９１２Ｖ，ＳＯＤ平＝０．２３９３×１．０８５７Ｖ。

The physical properties, characteristics of oxygendemand, proportions of chemical oxidation andbiological respiration in the total oxygen demand ofsediments from the Yuancun Reach of the PearlRiver in Guangzhou, were studied in laboratoryduring mean water and high water seasons. Resultsindicate that the sediment only consumed oxygeninitially over the first six hours in mean waterseason, while in high water season, .the sedimentcontinuoeusly consumed oxygen at a comparativelylow rate. It is doubt less that chemical oxygendemand plays a main role in toeal oxygen demand inboth hydrological seasons. At the same temperatureand water flow rate, the rate of sediment oxygenuptake in high water season is significantly higerthan that in mean water season. In addition, therates of sediment oxygen demand are related to thetemperature and flow rate and their equations are:SODM =0.4945 ×1. 0058T-20, SODH= 0. 6155 ×1.0234T-20, SODM= 0. 1623 ×1. 0912, SODH=0.2393 ×1. 0857.