James, Scott.

This thesis explains how channel classification systems can help landscape professionals to make predictions about the stability and potential changes to channel landscapes. Included is an overview of several stream classification systems and their methodologies. Several key concepts in stream classification are identified, including the following:

1. The importance of channel processes and channel form

2. Belief in the ability to predict future potential from current channel conditions

3. The use of observable, physical characteristics in classification.

4. The hierarchy of meaningful scales in drainage systems

5. The application of systems universally versus locally

6. Channels are in a state of dynamic equilibrium.

The author assessed two different classification systems. The Rosgen method is based on the morphological characteristics of the channel, using a scale of tens to thousands of meters, rather than the division of the channel into segments. The second system analyzed was devised by Montgomry and Buffington, based primarily on dividing the channel into reaches based on their morphology, sediment transport, sediment supply and discharge.

In this analysis, two key questions were asked. First, how does the classification system describe the landscape? Second, what are the strengths and limitations of applying the classification systems?

In conclusion, the author states that the two systems appear more similar than different. Both methods include analysis of the following factors:

1. Natural processes which affect channel landscape

2. Division of valley segment levels and channel reach

3. Speculation about potential channel response

4. Use of a discrete set of variables.

The primary differences occur in the application of the systems. The author believes the while the Rosgren system may be easier to apply at the reach level (being a matter of screening and following directions), the Montgomery and Buffington method provides a deeper and more comprehensive analysis.