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USE OF UnTRIM TO INVESTIGATE DISSOLVED OXYGEN TRANSPORT IN UPPER KLAMATH LAKE , OREGON

The hydrodynamic and constituent transport model UnTRIM was used to simulate hydrodynamics in Upper Klamath Lake, a shallow, hypereutrophic lake in which currents are responsive primarily to wind forcing. A simplified version of a dissolved oxygen model was used to simulate the transport of oxygen-depleted water from a deep trench on the western shoreline into important fish habitat in the northern part of the lake. Two scenarios were tested: a strong prevailing wind scenario and a weak prevailing wind scenario. The weak prevailing wind scenario resulted in lower dissolved oxygen concentrations in the deep trench, but higher concentrations in the fish habitat area. In contrast, the strong prevailing wind scenario induced stronger circulation through the fish habitat area, which resulted in greater transport of oxygen-depleted water from the trench into the fish habitat area and lower concentrations there. The results suggest that strong prevailing winds are more likely to lead to the conditions preceding a fish die-off than weak prevailing winds, which contradicts some previous studies, but is consistent with observations made from 2002 and 2004, including a year of a small die-off in 2003. The explanation could be that the previous studies that show a correlation of fish die-off years with low wind speeds relied on a flawed dataset, or, wind speed could simply be of less importance than other variables.