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Maximum outer-bank velocity reduction for vane-dike fields installed in channel bends


Scurlock, S. Michael; Cox, Amanda L.; Thornton, Christopher I.; Baird, Drew C. 2011. Maximum outer-bank velocity reduction for vane-dike fields installed in channel bends. In: Ramirez, Jorge A, ed. Proceedings: 31st Annual American Geophysical Union Hydrology Days; March 21-23, 2011; Fort Collins, CO. p. 46-56.

Hydraulic conditions associated with channel bends in meandering rivers include secondary, helical currents, mass shift of flow to the outside of the bend, and increased erosion along the outer streambank. Such outer-bank erosion may result in undesired plan-form migration of the stream course, placing valuable land holdings or infrastructure in jeopardy. A type of in-stream transverse rock structure, the vane dike, has been installed in field scenarios to mitigate problematic hydraulics associated with migrating river bends. Flows around vanes and similar structures have been modeled extensively in the past, both physically and numerically, yet, guidelines optimizing key state parameters for the installation of vane dikes in series are still unrealized and application of previous results are generally site specific. Emphasizing the stabilization of the upper reaches of the Middle Rio Grande River below Cochiti Dam, two scaled channel bends were physically modeled with installed vane-dike fields. Structure plan form angle, vertical angle, spacing, and length were altered between testing configurations and comprehensive data collection was performed. The reduction of the outer-bank velocity magnitude was quantified and non-dimensionalized for each tested vane-dike configuration. An approach predicting the outer-bank velocity reduction was developed for collected laboratory data, which approximates vane-dike field velocities for both channel bends with a coefficient of determination of 0.841.

Keywords: channel bends, outer-bank erosion, vane-dike fields


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http://www.fs.fed.us/rm/pubs_other/rmrs_2011_scurlock_m001.pdf

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Title: RMRS Other Publications: Maximum outer-bank velocity reduction for vane-dike fields installed in channel bends
Electronic Publish Date: January 17, 2012
Last Update:
January 17, 2012

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