Stefan, HeinzGulliver, John S.Hahn, Michael G.Fu, Alec2011-10-292011-10-291980-06https://hdl.handle.net/11299/117303This 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 channels. 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 month.en-USReport