Physical General Model of John
Day Lock and Dam, Columbia
River
Description
The John Day general physical model is a 1:80-scale fixed bed type that replicates from
river mile 212.5 to 219.0 of the Columbia River, including the navigation lock, dam, and
powerhouse. The model, which is used primarily by USACE Districts, other government
agencies, and biological agencies affected by the Columbia River, has been in use since
1995. Its functions are to view and study current patterns created with various spillway
operations, study the current pattern effects of installing flow deflectors on the dam, study
current pattern effects of installing surface bypass systems on bays of the powerhouse, and
study effects on navigation with the proposed modifications to the dam and/or
powerhouse.
The model has been used to evaluate changes in navigation conditions to the lock approach
Capabilities
after installation of flow deflectors on the dam. The model has also been used for
biological agencies to determine the operation of powerhouse units and spillway gates to
provide optimum egress conditions for migratory fish
The model uses a Video Tracking System (VTS) that allows timely collection and
Supporting Technology
obtain point velocities. A Web cam is installed to allow remote viewing via the Internet of
model activities and testing by Corps Districts and other interested parties.
Benefits
Specifically, studies are to improve navigation conditions and study flow patterns resulting
from modifications proposed to the spillway of the dam and tailrace of the powerhouse
that affect migration and passage of salmon.
The model is presently being prepared for studies to improve model performance as
Application
compared to prototype data collected in April 2003. The model users have been Portland
District engineering and biological personnel and the United States Geological Survey
(USGS). The model has been used to develop the operation schedule of the spillway and
powerhouse for the prototype to be used during the April-October spill seasons.
ERDC POC: Randy McCollum, 3909 Halls Ferry Road, Vicksburg, MS, 39180, (601)
Point of Contact
634-2719, e-mail
USACE
Partners
U.S. Army Engineer Research and Development Center
Nov 2004
Coastal and Hydraulics Laboratory (Capability/Service)
www.erdc.usace.army.mil
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