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

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INTRODUCTION
The U.S. Fish and Wildlife Service (Service) is currently involved
in an inter-agency agreement with the Bureau of Reclamation (Bureau)
(agrement no. 6-AA-40-04070). Part of the agreement includes an
evaluat-ion of Flaming Gorge Reservoir and how selected operations of
this reservoir may affect Colorado Squawfish in the Green River
Basin. Because water temperatures in the Green River may be
important to viable squawfish populations, the Service has developed
an Instream Water Temperature network. This network is currently
being used to model instream temperatures within the Green River as
a function of releases from Flaming Gorge. The primary objective of
this report is to detail the development of the temperature network,
describe the temperature model, and discuss the possible uses of the
temperature model as a predictive tool to determine instream
temperatures resulting from any operation of Flaming Gorge
Reservoir.
MODEL DESCRIPTION
The Instream Flow Temperature Model was developed by the Service's
National Ecology Center, in cooperation with the U.S. Soil Conserva-
tion Service (Theurer, et al., 1984). The model predicts instream
water temperatures based on hydrologic, meterologic, and geometric
stream conditions. The model is applicable to any size watershed
and can handle up to 365 time periods. A typical model network
consists of points on a river where stream conditions are described.
These points are called nodes. A description of each node type
follows:
Node Description
H Headwater point. Usually a USGS gage.
S Reservoir. Can be at headwater point.
J Junction between mainstem and tributary.
B Branch between mainstem and tributary.
T Tributary confluence with mainstem.
C Point on river where stream geometry and
shade conditions change from upstream
conditions.
V Point on river where known flow and water
temperature data are available. Used to
compare predicted and observed water temp-
eratures.
0~ Point on river where predicted water
temperatures can be obtained from model
output.
Features included in the model are described in detail by Theurer,