We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Demonstration Flow Assessment: Judgment and Visual Observation in Instream Flow Studies.
- Authors
Railsback, Steven F.; Kadvany, John
- Abstract
The Demonstration Flow Assessment (DFA) method evaluates instream flow benefits using expert judgment and direct observation of habitat during several flows. Early DFA applications were low-effort, qualitative, and vulnerable to well-known biases. We describe a higher-effort, more quantitative DFA (or expert habitat mapping) approach that uses techniques from the judgment-based decision analysis literature to increase objectivity and reproducibility. Specific metrics--habitat types to be quantified visually during flow observations--are designed from appropriate conceptual models of how flow affects target resources. During field observations, patches of each habitat type are delineated by consensus and marked on maps for digital analysis. A case study illustrates these procedures applied to instream flows for salmon spawning and rearing.
- Subjects
STREAM measurements; AQUATIC habitats; MATHEMATICAL models of habitats; ECOLOGICAL mapping; SALMON; FISH spawning; FISH farming
- Publication
Fisheries, 2008, Vol 33, Issue 5, p217
- ISSN
0363-2415
- Publication type
Article
- DOI
10.1577/1548-8446-33.5.217