Floating Wave-Energy Dissipation System for Coastal Erosion Control
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Solution Overview
Problem
Conventional wave-energy dissipation systems, such as rigid barriers and geotubes, are costly, visually unappealing, and can harm marine ecosystems, while existing alternatives like jetties and buoy systems have limitations in effectiveness and ecological impact, necessitating a more efficient and eco-friendly solution to reduce wave energy before it reaches shorelines.
Innovation Solution
A flexible and displaceable wave-energy dissipation system comprising a network of wave-energy dissipation cells with height-adjustable buoys connected by chains or flexible links, anchored to the seafloor, which moves in the direction of wave trains to absorb energy through drag forces, distributing load across multiple rows and adapting to varying wave conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rigid barriers or structures are built on coastline to block waves, then wave energy dissipation is improved, but cost increases and visual impact deteriorates
Solution Approach 1:
The system divides the wave energy dissipation function into multiple independent floating units arranged in rows, rather than using a single continuous rigid barrier. Each unit operates independently to dissipate wave energy through vertical motion, achieving collective protection while maintaining visual openness and reducing material costs.
Solution Approach 2:
The system replaces static rigid structures with dynamic floating units that move vertically in response to wave forces. This dynamic behavior allows the units to absorb and dissipate wave energy through controlled motion, reducing the need for expensive rigid construction while maintaining effective wave protection.
2Reliability
If geotubes are used for wave dissipation, then erosion protection is improved, but ecological harm worsens due to inhibition of underwater currents
Solution Approach 1:
The system extracts the wave dissipation function from continuous enclosed structures like geotubes, using instead discrete floating units with open spaces between them. This allows underwater currents to flow freely through and around the units, maintaining ecological functionality while still providing effective wave energy dissipation for erosion protection.
Solution Approach 2:
The floating units utilize flexible buoyant structures that can adapt to wave motion without creating rigid barriers to water flow. These flexible elements dissipate wave energy through controlled deformation and motion while permitting natural current patterns to continue, minimizing ecological disruption.
3Reliability
If jetties are built perpendicular to shoreline, then shoreline accretion is improved on updrift side, but downdrift erosion worsens due to interruption of longshore transport
Solution Approach 1:
The floating unit system provides multi-functional protection by dissipating wave energy across the entire array without creating localized interruptions to longshore transport. The distributed configuration allows water and sediment to flow around and between units, maintaining natural sediment transport patterns while providing comprehensive shoreline protection.
4Reliability
If conventional buoy systems are used to dissipate wave energy, then erosion protection is improved, but effectiveness deteriorates under large wave conditions
Solution Approach 1:
The floating units are designed with dynamic characteristics that allow them to respond effectively to a wide range of wave conditions. The units can undergo larger vertical excursions and interact more vigorously with high-energy waves compared to conventional buoys, maintaining protection effectiveness under extreme conditions while adapting to calmer periods.
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 system effectively reduces wave energy reaching shorelines, minimizing erosion while preserving marine ecosystems by absorbing wave energy through drag forces and adapting to different wave conditions, offering a cost-effective and visually unobtrusive solution.
Implementation Method 1
moves in the direction of wave trains to absorb energy through drag forces
Implementation Method 2
each wave-energy dissipation unit comprising a buoy
Data Source
AI summary
A flexible and displaceable wave-energy dissipation system includes a number of wave-energy dissipating system cells arranged forming a cell-type network. The system further includes one or more anchors securing the system to a floor or foundation site beneath a water body. Each anchor can include a vertical structural element securable to a plurality of concrete platforms or caps. The system cell can include one or more wave-energy dissipating units including a respective buoy. The buoys can be height-adjustable. Chains or other flexible links may connect the buoys to the anchors in various directions. The wave-energy dissipating units, when connected to one another, create a movable, wave-energy dissipating structure.