Title: Valley segments, stream reaches, and channel units.
Author: Bisson, Peter A.; Montgomery, David R.; Buffington, John M.
Source: In: Hauer, F. R.; Lamberti, G. A., eds. Methods in Stream Ecology. Second Edition. San Diego, CA: Academic Press: 23-49
Publication Series: Miscellaneous Publication
Description: Valley segments, stream reaches, and channel units are three hierarchically nested subdivisions of the drainage network (Frissell et al. 1986), falling in size between landscapes and watersheds (see Chapter 1) and individual point measurements made along the stream network (Table 2.1; also see Chapters 3 and 4). These three subdivisions compose the habitat for large, mobile aquatic organisms such as fishes. Within the hierarchy of spatial scales (Figure 2.1), valley segments, stream reaches, and channel units represent the largest physical subdivisions that can be directly altered by human activities. As such, it is useful to understand how they respond to anthropogenic disturbance, but to do so requires classification systems and quantitative assessment procedures that facilitate accurate, repeatable descriptions and convey information about biophysical processes that create, maintain, and destroy channel structure.
Keywords: valley segments, stream reaches, channel units, drainage network, landscapes, watersheds, spatial scales
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
XML: View XML
Bisson, Peter A.; Montgomery, David R.; Buffington, John M. 2006. Valley segments, stream reaches, and channel units. In: Hauer, F. R.; Lamberti, G. A., eds. Methods in Stream Ecology. Second Edition. San Diego, CA: Academic Press: 23-49
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility