USE OF UnTRIM TO INVESTIGATE DISSOLVED OXYGEN TRANSPORT IN UPPER KLAMATH LAKE, OREGON
نویسندگان
چکیده
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.
منابع مشابه
Effect of Water - Column pH on Sediment - Phosphorus Release Rates in Upper Klamath Lake , Oregon , 2001
.....................................................................................................................................................................................
متن کاملUse of models and observations to assess trends in the 1950–2005 water balance and climate of Upper Klamath Lake, Oregon
[1] A 1-dimensional surface energy balance model is applied to produce continuous simulations of daily lake evaporation of Upper Klamath Lake, Oregon (UKL) for the period 1950–2005. The model is implemented using observed data from land-based sites and rafts collected during 2005–2006. Progressively longer, temporally overlapping simulations are produced using observed forcing data sets from si...
متن کاملThe effects of physicochemical parameters on fish distribution in Eğirdir Lake, Turkey
The present study was conducted based on the fish species and physicochemical parameters of Eğirdir Lake. Sampling was carried out monthly from January through December 2010 between 9 am and 11 am. The parameters measured were water temperature, depth, secchi disk depth, turbidity, dissolved oxygen, saturation of dissolved oxygen, pH, conductivity, chloride, hardness, calcium, magnesium, bicarb...
متن کاملThe effects of physicochemical parameters on fish distribution in Eğirdir Lake, Turkey
The present study was conducted based on the fish species and physicochemical parameters of Eğirdir Lake. Sampling was carried out monthly from January through December 2010 between 9 am and 11 am. The parameters measured were water temperature, depth, secchi disk depth, turbidity, dissolved oxygen, saturation of dissolved oxygen, pH, conductivity, chloride, hardness, calcium, magnesium, bicarb...
متن کامل