Applied River Morphology

The Rosgen Classification system developed by Dave Rosgen is easily the most widely applied river classification system used in the U.S. Its popularity is largely due to its codified nature, making it easy to learn for all levels of user within a limited amount of time (months) and money; and easy to apply uniformly (and repeat) across a range of natural systems. This exceptionally thorough and detailed classification scheme assigns a channel type based on channel slope, width to depth ratio, bed material, entrenchment ratio and sinuosity. Training is divided into four different levels of increasing detail. For more information a complete description and documentation, including training opportunities, please go to:Wildland HydrologyRosgen, D.

In addition, Rosgen is the author of Applied River Morphology and Watershed Assessment of River Stability and Sediment Supply (WARSSS) and over 70 reports and articles in research journals, symposia, and federal agency manuals. His projects have been featured in Time, Science, 5280, National Geographic, The Denver Post, and The New York Times.

A classification of natural rivers. Catena, 22, 169-199Rosgen, D.L., 2008. River Stability Field Guide. Wildland Hydrology, Fort Collins, CO. (available for purchase from Wildland Hydrology)Rosgen, D.L., 2008. Watershed Assessment of River Stability and Sediment Supply.

Wildland Hydrology, Fort Collins, CO. (available for purchase from Wildland Hydrology)A response to many of the critiques of the Rosgen approach by the author can be found here:Rosgen, D.

The Application of Stream Classification Using the Fluvial Geomorphology Approach for Natural Channel Design: The Rest of the Story., 1-16A thoughtful, balanced investigation of both sides of “The Rosgen Wars” is presented here:Lave, Rebecca, 2009. The Controversy Over Natural Channel Design: Substantive Explanations and Potential Avenues for Resolution. Journal of the American Water Resources Association (JAWRA) 45(6):1519-1532. DOI:10.1111/j.1752-1688.2009.00385.xAdditional references for download from Wildland Hydrology.

River morphology has been a subject of great challenge to scientists and engineers who recognize that any effort with regard to river engineering must be based on a proper understanding of the morphological features involved and the responses to the imposed changes. In this paper, an overview of river morphology is presented from the geomorphic viewpoint. Included in the scope are the regime concept, river channel classification, thresholds in river morphology, and geomorphic analysis of river responses. Analytical approach to river morphology based on the physical principles for the hydraulics of flow and sediment transport processes is also presented. The application of analytical river morphology is demonstrated by an example.

Modeling is the modern technique to determine both short-term and long-term river channel responses to any change in the environment. The physical foundation of fluvial process-response must be applied in formatting a mathematical model. A brief introduction of the mathematical model FLUVIAL-12 is described.

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Fluvial Processes in River Engineering M. John Wiley & Sons, New York, NY.