| Adaptation of the Levee Erosional Equivalence Method for the Hurricane Storm Damage Risk Reduction System (HSDRRS) |
May 2011 |
142 pages |
| Authors:
Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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 | This report describes a rational methodology for evaluating the strength and resiliency of earthen levees against wave overtopping forces during hurricanes. The new methodology was developed by extending Dean, et al.'s (2010) concept of cumulative excess work, which hypothesized that damage to grass-covered slopes is caused by cumulative work done by the overtopping waves in excess of some tolerable level. The erosional equivalence method is able to account for the ... |
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| Flood-Side Wave Erosion of Earthen Levees: Present State of Knowledge and Assessment of Armoring Necessity |
Aug 2010 |
123 pages |
| Authors:
Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| This report is a compilation of facts and information that summarizes the present state of knowledge related to wave attack on the flood side of earthen levees. Particular emphasis was placed on the need for providing flood-side armoring (beyond the protection afforded by grass) for the New Orleans Hurricane & Storm Damage Risk Reduction System (HSDRRS). The report includes: (1) a summary of observations from Hurricane Katrina; (2) an extensive ... |
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| Physical Model of Knik Arm and the Port of Anchorage, Alaska |
May 2010 |
184 pages |
| Authors:
Steven A Hughes; Julie A Cohen; Hugh F Acuff; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| A large physical model replicating approximately 19 miles of Cook Inlet was constructed at ERDC with a horizontal length scale of 800-to-1 and a vertical length scale of 200-to-1. The model included the Knik Arm, a portion of Eagle Bay, and a region south of Point Woronzof. The Port of Anchorage is located in the Knik Arm, and tidal flows at the Port generated by the +30-ft tide range are ... |
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| Shear Stress Estimates for Combined Wave and Surge Overtopping at Earthen Levees |
Jan-2009 |
23 pages |
| Authors:
Norberto C Nadal; Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| The Coastal and Hydraulics Engineering Technical Note (CHETN) described herein provides empirical equations for estimating shear stresses on the land-side slope of earthen levees resulting from the combination of storm surge steady overflow and unsteady overtopping of irregular waves. A worked example provides guidance on application of the empirical equations.s |
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| Estimation of Wave Run-up on Smooth, Impermeable Slopes using the Wave Momentum Flux Parameter |
16-Jul-2004 |
21 pages |
| Authors:
Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| This paper re-examines existing wave run-up data for regular, irregular and solitary waves on smooth, impermeable plane slopes. A simple physical argument is used to derive a new wave run-up equation in terms of a dimensionless wave parameter representing the maximum, depth-integrated momentum flux in a wave as it reaches the toe of the structure slope. This parameter is a physically relevant descriptor of wave forcing having units of force. ... |
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| Effect of Offset Jetties on Tidal Inlet Flood Flow |
01-Jan-2000 |
9 pages |
| Authors:
Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| Tidal currents at inlets protected by jetties exhibit characteristics of jetlike flows. For flood tide, the planform geometry of parallel inlet jetties appears to be a major factor influencing the flood flow distribution across the inlet channel. Equal length jetties tend to direct the majority of the flood flow down the middle of the channel, but if the jetties have unequal seaward lengths, the flow is directed to one side ... |
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| Physical Model of Current-Induced Scour at Ventura Harbor |
01-Jan-1999 |
20 pages |
| Authors:
Steven A Hughes; Bradd R Schwichtenberg; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| This paper describes a 1:25-scale movable-bed physical model study of scour resulting from longshore current passing through a narrow gap on the leeside of the detached breakwater at Ventura Harbor, California, USA. The physical model was calibrated by adjusting the total flow discharge to achieve equilibrium scour development that matched the scour hole measured at Ventura Harbor. The calibrated model was then used to predict future scour potential and to ... |
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| A Locally Nonlinear Interpretation of PUV Measurements |
01-Oct-1998 |
21 pages |
| Authors:
Rodney J Sobey; Steven A Hughes; CALIFORNIA UNIV BERKELEY DEPT OF CIVIL ENGINEERING
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| A time domain method is presented for analyzing simultaneous measurements of pressure and the horizontal components of velocity obtained beneath irregular multidirectional wave fields. This new method differs from the usual linear directional analyses applied to PUV data in two important aspects. First, the essential nonlinearity of the measured waves is not sacrificed to achieve a solution. Therefore, predictions of sea surface elevation and directional kinematics throughout the water column ... |
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| Combined Wave and Surge Overtopping of Levees: Flow Hydrodynamics and Articulated Concrete Mat Stability |
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184 pages |
| Authors:
Steven A Hughes; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| A 1-to-25 scale physical model of a typical cross section of the levee along the Mississippi River Gulf Outlet (MRGO) was constructed at the U.S. Army Engineer Research and Development Center's Coastal and Hydraulics Laboratory in Vicksburg, MS. The purpose of the physical model was to obtain hydrodynamic measurements of unsteady flow conditions caused by combined wave and surge overtopping of the levee, and to examine the feasibility of using ... |
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