AWWA WQTC71446

This powerpoint presentation begins by providing a brief overview of surface circulators installed in Occoquan Reservoir in 2006 to improve dissolved oxygen conditions/control manganese concentrations. Research objectives included the following: analyze the effects of surface circulator operation onthermal stratification and dissolved oxygen distribution; model the influence of surface circulators in Occoquan Reservoir; and, evaluate the limits of surface circulators for improving dissolved oxygen concentrations in lakes/reservoirs. Experimental methods include: vertical profiling; transects from NW to WB; near-field profiling; sample collection; and, ADV profiling of the near-field. Topics presented include: modeling of Occoquan Reservoir; representation of the circulators; constituent interaction; calibrating W2 and circulation flow rate; and, virtual lake simulation. Presentation summary includes the following: the surface circulation system was undersized for adequatelyoxygenating Occoquan Reservoir; the surface circulation system should have the intake near thesediments at the deepest part of the reservoir for the highest efficiency; the sediments' anoxic fraction is best influenced when the flow rate produces a turn over period close to 20 days;the water temperature is easily influenced by circulation and behavespredictably like a conservative constituent; and,the dissolved oxygen is harder to influence, and its vertical distributionis a function of supply and demand within the water column. Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

48

File Size:

1 file , 4.4 MB