武汉东湖泥沙需氧量现场测试

泥沙需氧量(SOD)是综合评价水体水质和环境特征的一个重要参数,也是水质数学模型中的关键参数。本文借鉴国内外SOD现场测试的经验和数值模拟结果,合理设计SOD测试仓布置,研制和开发了泥沙需氧量(SOD)现场实测设备,实现SOD的现场连续测试。在武汉东湖后湖区近岸处进行了SOD现场实测,所测得的SOD平均值为2.25 g/(m2.d),说明水域实测点处泥沙耗氧较高,占水体耗氧的主要部分。对国内外淡水域SOD现场实测和实验室测试的成果进行了总结并与本文成果比较,表明本文成果处于国外文献现场实测SOD值的范围内,略偏高。

In situ measurement of sediment oxygen demand at the East Lake in Wuhan City

Sediment oxygen demand (SOD) is one of the important parameter for evaluation of water quality and a key parameter for water quality numerical modeling. A measuring system is developed to carry out the in situ measurement of sediment oxygen demand in the East Lake, Wuhan City. The internal structure of the measuring device including the dimensions of chamber, optimal arrangement of the inlet and outlet are determined according to the numerical modeling of the flow in the chamber. The average SOD of continuous measurement is 2.25g/(m2·d). This shows the oxygen consumption of sediment at the measuring location is the major part of the oxygen consumed in water body. The comparison of the masurement result with the data given by other authors in abroad shows the result is reliable.