On Wave Runup Height and Overtopping Quantity of Gentle Slope Revetment Placed behind Artificial Reef

Impulse waves are generated by landslides or avalanches impacting oceans, lakes or reservoirs, for example. Non-breaking impulse wave runup on slope angles ranging from 10° to 90° (V/H: 1/5.7 to 1/0) is investigated. The prediction of runup heights induced by these waves is an important parameter for hazard assessment and mitigation. An experimental dataset containing 359 runup heights by impulse and solitary waves is compiled from several published sources. Existing equations, both empirical and analytical, are then applied to this dataset to assess their prediction quality on an extended parameter range. Based on this analysis, a new prediction equation is proposed. The main findings are: (1) solitary waves are a suitable proxy for modelling impulse wave runup; (2) commonly applied equations from the literature may underestimate the runup height of small wave amplitudes; (3) the proposed semi-empirical equations predict the overall dataset within ±20% scatter for relative wave crest amplitudes ε, i.e., the wave crest amplitude normalised with the stillwater depth, between 0.007 and 0.69.

Download Full-text

Numerical Simulation of Surface Waves Generated by a Subaerial Landslide at Lituya Bay, Alaska

Volume 4: Ocean Engineering; Ocean Renewable Energy; Ocean Space Utilization, Parts A and B ◽

10.1115/omae2009-79595 ◽

2009 ◽

Cited By ~ 3

Author(s):

Debashis Basu ◽

Steve Green ◽

Kaushik Das ◽

Ron Janetzke ◽

John Stamatakos

Keyword(s):

Free Surface ◽

Computational Study ◽

Multiscale Model ◽

Detached Eddy Simulation ◽

Wave Runup ◽

Complex Flow ◽

Eddy Simulation ◽

Subaerial Landslide ◽

Runup Height ◽

The Impact

This paper presents preliminary results of a computational study conducted to analyze the impulse waves generated by the subaerial landslide at Lituya Bay, Alaska. The volume of fluid (VOF) method is used to track the free surface and shoreline movements. The Renormalization Group (RNG) turbulence model and Detached Eddy Simulation (DES) multiscale model were used to simulate turbulence dissipation. The subaerial landslide is simulated using a sliding mass. Results from the two-dimensional (2-D) simulations are compared with results from a scaled-down experiment. The experiment is carried out at a 1:675 scale. In the experimental setup, the subaerial rockslide impact into the Gilbert Inlet, wave generation, propagation, and runup on the headland slope are considered in a geometrically undistorted Froude similarity model. The rockslide is simulated by a granular material driven by a pneumatic acceleration mechanism so that the impact characteristics can be controlled. Simulations are performed for different values of the landslide density to estimate the influence of slide deformation on the generated tsunami characteristics. Simulated results show the complex flow patterns in terms of the velocity field, shoreline evolution, and free surface profiles. The predicted wave runup height is in close agreement with both the observed wave runup height and that obtained from the scaled-down experimental model.

Download Full-text

Nonlinear long-wave deformation and runup in a basin of varying depth

Nonlinear Processes in Geophysics ◽

10.5194/npg-16-23-2009 ◽

2009 ◽

Vol 16 (1) ◽

pp. 23-32 ◽

Cited By ~ 6

Author(s):

I. Didenkulova

Keyword(s):

Asymptotic Methods ◽

Finite Amplitude ◽

Wave Runup ◽

Wave Dynamics ◽

Initial Wave ◽

Wave Deformation ◽

Nonlinear Shallow Water Theory ◽

Two Parameters ◽

Constant Slope ◽

Runup Height

Abstract. Nonlinear transformation and runup of long waves of finite amplitude in a basin of variable depth is analyzed in the framework of 1-D nonlinear shallow-water theory. The basin depth is slowly varied far offshore and joins a plane beach near the shore. A small-amplitude linear sinusoidal incident wave is assumed. The wave dynamics far offshore can be described with the use of asymptotic methods based on two parameters: bottom slope and wave amplitude. An analytical solution allows the calculation of increasing wave height, steepness and spectral amplitudes during wave propagation from the initial wave characteristics and bottom profile. Three special types of bottom profile (beach of constant slope, and convex and concave beach profiles) are considered in detail within this approach. The wave runup on a plane beach is described in the framework of the Carrier-Greenspan approach with initial data, which come from wave deformation in a basin of slowly varying depth. The dependence of the maximum runup height and the condition of a wave breaking are analyzed in relation to wave parameters in deep water.

Download Full-text

Wave Runup for Nowshahr Breakwater at Tide and EBB Scenarios

Brilliant Engineering ◽

10.36937/ben.2021.004.003 ◽

2021 ◽

Vol 2 (4) ◽

pp. 10-14

Author(s):

Farhad Sakhaee

Keyword(s):

Water Depth ◽

Wave Energy ◽

High Strength ◽

Design Criteria ◽

Breaking Wave ◽

Extreme Conditions ◽

Shore Protection ◽

Wave Runup ◽

The Stability ◽

Runup Height

This study investigates runup design at breakwaters and design criteria under tidal and ebb scenarios for both head and truck of Nowshahr breakwater. First part includes runup height calculations based on shore protection manuals. Based of wave height, frequency, and water depth at the toe runup height has been calculated and Second portion has been dedicated to design of head and truck of Nowshahr port based on Hudson stability formula. Collision of wave and the breakwater head, results in immediate reduction in wave energy. As wave energy propagated gradually decreases when it meets the trunk. The results showed that in both conditions weight of head would be higher than the trunk of breakwater. while, both head and trunk are designed based on high strength materials, but the head has higher degree of importance in terms of design criteria. Hudson formula is responsible for the stability of breakwater structure. Tidal case which considers a non-breaking wave as well as ebb scenario including a breaking wave has been studied to include two extreme conditions occurs to breakwaters. The results showed the higher weight of head is responsible for stability of breakwater at both conditions.

Download Full-text