Channel evolution during and after dam removal: Sediment Dynamics Post Dam Removal

Alessandro Cantelli, Miguel Wong, Gary Parker, Chris Paola

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We develop and illustrate a numerical model for the evolution of a channel during and after removal of a dam. The most important new feature of the model is that it captures a phenomenon we have observed in experiments on dam removal: "erosional narrowing", a narrowing of the channel due to preferential erosion along the channel centerline and consequent flow restriction and spatial acceleration. The narrowing tendency is counterbalanced by the well known tendency of the channel to widen due to bank erosion. The interplay of these two effects can lead, among other things, to upstream propagation of waves of incision and sedimentation. The onset of narrowing is sensitive to the rate of fall of base level, controlled in the dam-removal case by the rate of draining of the reservoir. Ultimately, bank erosion and concomitant sedimetation in the channel center win out, leading to creation of a new channel profile with a lower streamwise slope.

Original languageEnglish (US)
Title of host publicationManaging Watersheds for Human and Natural Impacts
Subtitle of host publicationEngineering, Ecological, and Economic Challenges - Proceedings of the 2005 Watershed Management Conference
EditorsG.E. Moglen
Number of pages1
StatePublished - 2005
Externally publishedYes
Event2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges - Williamsburg, VA, United States
Duration: Jul 19 2005Jul 22 2005

Publication series

NameProceedings of the 2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges

Other

Other2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges
CountryUnited States
CityWilliamsburg, VA
Period7/19/057/22/05

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Channel evolution during and after dam removal: Sediment Dynamics Post Dam Removal'. Together they form a unique fingerprint.

  • Cite this

    Cantelli, A., Wong, M., Parker, G., & Paola, C. (2005). Channel evolution during and after dam removal: Sediment Dynamics Post Dam Removal. In G. E. Moglen (Ed.), Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges - Proceedings of the 2005 Watershed Management Conference (Proceedings of the 2005 Watershed Management Conference - Managing Watersheds for Human and Natural Impacts: Engineering, Ecological, and Economic Challenges).