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REPLY TO DISCUSSION: “Effect of Flow Velocity on Sediment Oxygen Demand: Comparison of Theory and Experiments” 2

The authors thank Dr. Whittemore for providing additional references showing evidence of the effect of flow on sediment oxygen demand (SOD). The objective of the experiment described in our paper was not to develop a method for testing of specific lake sediment, but to create a laboratory experiment in which flow conditions in a benthic boundary layer were similar to in-situ conditions. Previous field and laboratory studies had noted flow effects on SOD, but not established realistic velocity conditions in the test chambers used. The SOD measurements in our laboratory flume were not intended to be representative of a specific lake because the sediments were, indeed, disturbed. The velocity dependence of SOD was, however, quantified for these sediments, and related to boundary layer (flow) limited mass transfer theory. Dr. Whittemore points out that the release of nutrients from the sediment is also affected by flow in the boundary layer. We concur with this observation. A theory that links sedimentary oxygen uptake and phosphate release from sediment with flow velocities in the boundary layer has been developed by our earlier cooperator, Dr. Y. Nakamura (1994), and confirmed in laboratory experiments similar to ours.