Describing the thermal regimes of two northeastern Oregon streams Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3t945t109

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  • Two tributaries of the south fork of the Burnt River, near Unity Oregon were studied during the summers of 2000 and 2001 to determine water heating and cooling patterns. Hourly temperature data were recorded for air, water, and soil parameters at four elevations 150m apart on Barney and Stevens Creeks. Both creeks shared the same geographic attributes but were found to heat quite differently. These differences may be attributed to differences in discharge, exposure time, temperature gradient, and vegetative cover. Lags between peak heating of air and water were evident on both creeks, with slight differences. Lags between air and water during the cooling cycle were not as evident, particularly on Stevens Creek. Although differences between the creeks' thermal regimes were apparent, equations showed strong association between maximum air temperature and maximum water temperature, with minimum air temperature also showing strong association with maximum water temperature on portions of Stevens Creek. Stepwise regression analysis established a strong relationship (R² 0.69-0.9 1) between maximum air temperature and peak water temperature change (the maximum temperature change recorded in a 2 hour heating period between 5am-5pm). An equation to predict water temperature change in a given day, based on derivatives of air and water temperature also showed strong fit and good predictive ability on both creeks. Thus while each creek was different and responded to its thermal environment, certain air temperature variables had strong association, regardless of differences between creeks.
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