7073

• UCREFRP Catalog Number: 7073
• Author: Brewer, M. and J. Renne.
• Title: Application of the Instream Temperature Model to the Green River Basin
• USFW Year: 1989.
• USFW - Doc Type: Draft.
• Copyright Material: NO

Instreaaa Teeaperature Model "*'DRAFT'*"
Page 2
March 27, 1989
et al. (1984}. The primary model components are 1) a solar model
that predicts the solar radiation penetrating a water surface; 2) a
meteorology transfer model that transfers meteorological data from a
weather station to any point in the basin; 3) an equilibrium water
temperature model using heat flux components; 41 a dynamic tempera-
ture, steady flow heat transport model; 5) validation and calibra-
tion procedures for certain physical parameters when water
temperatures are available at interior points; and 6) regression
techniques to complete water temperature and discharge data at nodes
where this information is required.
Solar Model
The solar model predicts solar radiation that penetrates the water
as a function of latitude, time of year, and meteorological
conditions. These data are typically obtained at a meterologic
station that is centrally located within the network.
hf a„t_e o._r o f _o g_y__._M_o d e l
The meteorology model calculates changes in air temperature,
relative humidity, and atmospheric pressure as functions of a
change in elevation from the central meterologic station to all
nodes in the network. Thus, this model transposes meteorology data
from a single point in the basin to all nodes throughout the
network.
H_e. a_t._. ,F_1 _u_x ._._M_o_d, e_1
The heat flux model predicts the
and its surrounding environment.
are input to this model.
Heat __Tra_nsp_or_t Mo_de1
energy balance between the water
The transposed meteorology data
The heat transport model predicts the average mean daily water
temperature and Biel fluctuations in water temperature as functions
of stream distance. This model differs from lake models because
downstream water movement tends to mix the water. This turbulent
mixing is assumed to evenly distribute the temperature both
vertically and transversely; this assumption is the basis for using
a constant water temperature throughout a given cross section at any
given instant.
Va„ligation Model
The validation model is used to compare predicted water temperatures
with observed water temperatures at any point within the network
where observed data are available. These points are called