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Earthen Levee Shear Stress Estimates for Combined Wave Overtopping and Surge Overflow

Hughes, Steven A. / Shaw, Justin M. / Howard, Isaac L.

Abstract

A total of 25 small-scale laboratory experiments simulating combined wave overtopping and storm-surge overflow on a trapezoidal levee were conducted at a nominal prototype-to-model scale of $N_{L} = 25$ . Time series measurements of irregular and unsteady flow thickness and velocity were acquired at two locations on the landward-side, $1 V : 3 H$ slope. These measurements were used to calculate the time series of instantaneous shear stress representing the average over a 4.8-m-long (prototype scale) levee slope between the two measurement locations. Empirical relationships are presented for estimating the mean shear stresses for steady overflow and for combined wave and surge overtopping. For the latter case, additional formulas are given for estimating representative parameters of the irregular shear stress peaks associated with individual overtopping waves. The collected data were intended primarily for the design of rapidly deployable levee armoring systems; however, the data could also be used to evaluate the erosion of soil or vegetated levees and dikes.

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Earthen Levee Shear Stress Estimates for Combined Wave Overtopping and Surge Overflow

Hughes, Steven A. / Shaw, Justin M. / Howard, Isaac L.

Abstract

A total of 25 small-scale laboratory experiments simulating combined wave overtopping and storm-surge overflow on a trapezoidal levee were conducted at a nominal prototype-to-model scale of $N_{L} = 25$ . Time series measurements of irregular and unsteady flow thickness and velocity were acquired at two locations on the landward-side, $1 V : 3 H$ slope. These measurements were used to calculate the time series of instantaneous shear stress representing the average over a 4.8-m-long (prototype scale) levee slope between the two measurement locations. Empirical relationships are presented for estimating the mean shear stresses for steady overflow and for combined wave and surge overtopping. For the latter case, additional formulas are given for estimating representative parameters of the irregular shear stress peaks associated with individual overtopping waves. The collected data were intended primarily for the design of rapidly deployable levee armoring systems; however, the data could also be used to evaluate the erosion of soil or vegetated levees and dikes.

Earthen Levee Shear Stress Estimates for Combined Wave Overtopping and Surge Overflow

Hughes, Steven A. / Shaw, Justin M. / Howard, Isaac L.

Abstract

A total of 25 small-scale laboratory experiments simulating combined wave overtopping and storm-surge overflow on a trapezoidal levee were conducted at a nominal prototype-to-model scale of $N_{L} = 25$ . Time series measurements of irregular and unsteady flow thickness and velocity were acquired at two locations on the landward-side, $1 V : 3 H$ slope. These measurements were used to calculate the time series of instantaneous shear stress representing the average over a 4.8-m-long (prototype scale) levee slope between the two measurement locations. Empirical relationships are presented for estimating the mean shear stresses for steady overflow and for combined wave and surge overtopping. For the latter case, additional formulas are given for estimating representative parameters of the irregular shear stress peaks associated with individual overtopping waves. The collected data were intended primarily for the design of rapidly deployable levee armoring systems; however, the data could also be used to evaluate the erosion of soil or vegetated levees and dikes.

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Title:

Earthen Levee Shear Stress Estimates for Combined Wave Overtopping and Surge Overflow

Contributors:

Hughes, Steven A. (author) / Shaw, Justin M. (author) / Howard, Isaac L. (author)

Published in:

Journal of Waterway, Port, Coastal, and Ocean Engineering ; 138 ; 267-273

Publication date:

2011-10-14

Size:

72012-01-01 pages

ISSN:

0733-950X , 1943-5460

DOI:

https://doi.org/10.1061/(ASCE)WW.1943-5460.0000135

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

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