Graduate Thesis Or Dissertation
 

The effect of mixing on the oxygen uptake rate of estuarine bottom deposits

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  • A study of the effect of mixing on the oxygen uptake rate of estuarine bottom deposits is presented. The method of study involved the mixing of samples of bottom deposits with the overlying water to result in concentrations of suspended matter in the same order as observed in the estuary. Some samples were kept in a quiescent state as a control and the others mixed to concentrations of 30 to 50 mg/1 suspended matter. The effect of depth and the non-biological oxygen demand are presented with a discussion of the source of biochemical oxygen demand. Results of this study showed that: 1. Mixing has a pronounced effect on the oxygen uptake rate. 2. The results tend to confirm that the increase in oxygen uptake is due to the release of bio-degradable substances from the bottom. 3. The oxygen uptake of benthic gases appears to be small compared to the total oxygen uptake rate. 4, The depth of deposit has no effect on oxygen uptake between the depths of two and 12 inches. 5. The possibility of a material having a high decay rate coefficient being released from the bottom deposit warrants further investigation. 6. The change in concentration of matter suspended from the surface of deposits in the order of 100 mg per liter appears to have no apparent effect on the oxygen uptake rate of water overlying the deposits.
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