Slotted Vertical Barriers for Coastal Wave Damping
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Solution Overview
Problem
Existing coastal erosion mitigation methods, such as seawalls, groin fields, and offshore breakwaters, are expensive, environmentally damaging, and inefficient in damping ocean waves to specific levels required for different applications, causing beach erosion and structural damage.
Innovation Solution
A method using a plurality of parallel slotted vertical barriers with varying porosity and number of walls to dissipate wave energy, allowing for customizable wave damping by selecting optimal barrier configurations based on wave transmission coefficients, material volume, and structural forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional rubble mound breakwaters are used, then wave energy is dissipated and coastal erosion is reduced, but the structure is expensive, environmentally damaging, and creates rip current channels
Solution Approach 1:
The breakwater is segmented into multiple vertical walls with slots instead of a continuous rubble mound structure. This segmentation allows wave energy to be dissipated through the slots while preventing the formation of rip current channels that occur with traditional breakwater designs.
Solution Approach 2:
The vertical walls incorporate slots creating a porous structure that allows controlled wave transmission. This porosity enables wave energy dissipation while maintaining beach quality and preventing the harmful rip current effects associated with solid breakwater structures.
2Strength
If seawalls are used to protect coastal property, then erosion protection is improved, but beach sand loss is accelerated
Solution Approach 1:
The vertical walls with slots provide localized wave energy dissipation while allowing controlled wave transmission to reach the beach. This local quality control protects coastal property from erosion while maintaining sufficient wave action to prevent beach sand loss.
3Object-affected harmful factors
If the number of vertical walls and porosity are increased to improve wave damping, then wave transmission coefficient is reduced, but the volume and complexity of the barrier increases
Solution Approach 1:
The porosity of each vertical wall is optimized to achieve the desired wave transmission coefficient. By adjusting the slot dimensions and wall spacing, effective wave damping is achieved without requiring an excessive number of walls, thus controlling structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces wave energy and structural forces, offering a more economical and environmentally friendly solution than conventional breakwaters, with the ability to maintain beach quality and extend the lifespan of marine structures.
Implementation Method 1
A method for damping ocean waves in a coastal area uses a barrier having a plurality of vertical walls positioned parallel to each other, each of the walls defining a plurality of horizontally extending slots
Implementation Method 2
The dimensions of the slots, or overall porosity of the wall, can be varied to provide different levels of damping
Data Source
AI summary
The method for damping ocean waves in a coastal area uses a barrier having a plurality of vertical walls positioned parallel to one another, each wall defining a plurality of horizontally extending slots. The dimensions of the slots, or overall porosity of the wall, and the number of walls positioned in parallel may be varied to provide different levels of damping. Accordingly, a desired amount of damping may be provided through varying the porosity of the walls and the number of walls. The method defines a transmission coefficient equal to the wave height of waves transmitted from the barrier divided by the wave height of waves incident on the barrier, and collects experimental data normalized with the significant wave height and the wavelength at the peak period for the depth of water to select the combination of wall number and porosity to produce the desired damping.