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Last modified
7/14/2009 5:02:28 PM
Creation date
5/18/2009 12:09:22 AM
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UCREFRP
UCREFRP Catalog Number
1101
Author
U.S. Fish and Wildlife Service, U. C. R. B. S.
Title
Critical Assessment of PHABSIM Model, and the Modeling Effort.
USFW Year
1985.
USFW - Doc Type
\
Copyright Material
NO
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* + * DRAFT * * * UCRBCOMM i2 FEB 85 <br />DEFICIENCY 4: Utilization curves are a major part of the PHABSIM mode l <br />however the model only initializes a limited number of environmental <br />parameters (depth, velocity, substrate, temperature). Many curves have been <br />combined among rivers, and the overall error effect relating to the development <br />of curves might therefore be large. Furthermore, application of the curves in' <br />the model, specifically the equal weighting of the above-mentioned parameters, -- <br />might be erroneous. The development and application of the utilizaticn curves <br />must be critically analyzed. <br />RECOMMENDATI©N: Testing/validation of the model requires testing of the <br />following hypothesis 1: utilization curves accurately indicate the "true" <br />habitat preferences of the endangered fishes; hypothesis 2) equal weighting of <br />environmental parameters is appropriate. <br />20 <br />
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