Graduate Thesis Or Dissertation
 

In situ measurement of the benthal oxygen requirements of tidal flat deposits

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  • In situ light and dark planktonic and benthal respirometers were used to measure the oxygen requirements of Yaquina estuary water and benthal deposits. Respirometer devices were constructed so that actual conditions of mixing could be simulated and benthal deposit disturbance would be minimized. A mathematical model of a benthal respirometer was developed and was used to make corrections for respirometer leakage and to conduct oxygen transfer parameter sensitivity studies. The effect of mixing on benthal oxygen uptake was studied by varying the simulated mixing velocities. Studies were made to determine the effects of scour of bottom material on the salinity of the respirometer water and on the benthal oxygen uptake rates. Plots of various parameters such as benthal oxygen uptake versus dissolved oxygen concentration and respirometer leakage versus time were made to attempt to evaluate relationships that may exist.
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