This report summarizes some of the morphological, hydraulic, thermal
and meteorological characteristics of the experimental field channels at the
USEPA Monticello Ecological Research Station. It contains an ,overview of
measurements and parameters which characterized the physical operation, conditions
of the channels from December 1975 through December 1977.
Reported herein are measured values of hydraulic channel roughness,
permeability and porosity of rock sections, and thermal diffusivity of bed
materials. Recorded water temperatures have been statistically analyzed to .
give local diel, longitudinal, and vertical water temperature variations. A
data bank of 3-hour water temperature data was established. Mean, standard
deviation, skewness, and water temperature values at 5 per cent and 95 per cent
probability of occurrence have been calculated on sliding, weekly samples of
these 3-hour data.
Various aspects of the water temperature regime of the experimental
field channels of the USEPA Monticello Ecological Research Station (MERS)
were studied theoretically. Longitudinal dispersion and heat transfer
relationships which were included in a dynamic water temperature model had
to be established. Water temperatures at various channel locations and
meteorological parameters were continuously recorded. A convective water
surface heat transfer relationship (wind function) was determined from the
recorded longitudinal temperature profile and meteorological parameters during
quasi-steady state periods. Progressive heat fronts were used with tracer
theory to determine longitudinal dispersion coefficients for the field
The wind function and the longitudinal dispersion coefficient were
incorporated in an implicit finite difference computer model, MNSTREM, for
the highly dynamic water temperature prediction in the very shallow field
channels. The water temperature model results were verified against
3-hour water temperature measurements over four time periods of up to one
Environmental Research Laboratory - Duluth
Office Of Research And Development
U. S. Environmental Protection Agency
Stefan, Heinz; Gulliver, John S.; Hahn, Michael G.; Fu, Alec.
Water Temperature Dynamics In Experimental Field Channels: Analysis And Modeling.
Saint Anthony Falls Laboratory.
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