Our technology effectively fights beach erosion by reducing wave energy, while capturing sand that is suspended in the nearshore waters. Made with eco-friendly and highly durable material, the Derosion Lattice is designed to be submerged in shallow sea water.
Unlike sand nourishment, our method does not need to be repeated every couple of years; the sand accumulated does not get eroded away again, and will not bury creatures or coral reefs alive.
Our method reduces wave energy through friction and vibration, enabling sediments to evenly and steadily accreed on the beach. Unlike breakwaters which change the direction of the waves, our method will NOT create a groyne effect and cause erosion further down the coastline.
Derosion Lattice
The Derosion Lattice is installed in shallow waters at an angle to sea level, able to reduce wave energy by 30-50%. Sediment accumulates gradually with each wave that washes over the lattice. Over time, sand depth will increase both in front and behind the Derosion Lattice, reducing the steepness in slope and pushing out the shoreline towards the sea.
Schematic Design
- Polyamide Lattice – these pieces work to reduce wave energy through friction and vibration, while capturing sand brought in by the waves
- Floaters – to keep the lattice afloat for optimal efficiency
- Steel Pipe Frame – provides a durable structure to withstand strong waves
- Support Pillars – these prop up the lattice, at an angle to waves crashing in
Dimensions: L 20m x W 4m x H 1.6m
Our Research
National Cheng Kung University
ReShore Technologies has collaborated with National Cheng Kung University for many years on a Joint Research Project.
Design and testing of the technology were done in the research lab of the Hydraulic and Ocean Engineering Department at NCKU.
In 2020, ReShore Technologies started a new research project with the Offshore Structure & Renewable Energy Laboratory of National Cheng Kung University: “Experimental Analysis and Research on the Effect of the Derosion Lattice on Coastal Erosion and Sedimentation.” This study will include 48 different conditions in measuring the Derosion Lattice’s effect on reducing wave energy, increasing sand accretion, and preventing further coastal erosion.
Team Professor Ray-Yeng Yang from the Offshore Structures and Renewable Energy Laboratory of the Department of Hydraulic and Ocean Engineering, National Cheng Kung University (NCKU), conducted a sedimentation movable-bed model experiment in the Tainan Hydraulic Laboratory of NCKU. The experimental model was placed in the wave-breaking zone and the coastline area. And the wave conditions were divided into summer, winter, and typhoon seasons, with different wave heights and periods of the incident waves. The experiment result shows that the wave height can be reduced by 20% to 35% after waves go through the Derosion Lattice model. The average decrease of suspended load concentration is about 11%~23%, which indicates that sedimentation occurred behind the structure. The experimental results of various testing conditions show that the Derosion Lattice can protect the coastline and land from erosion caused by waves.
Wave height attenuation: Before & After passing through Derosion Lattice
Turbidity dropped significantly after waves passed through the Derosion Lattice:
Research Paper 1
An Experimental Field Study Using a Flexible
High-Strength Net Breakwater for Shore Protection
High-Strength Net Breakwater for Shore Protection
Abstract:
Shorelines are subjected to severe erosion because of the action of perennial waves. Although traditional rigid structures have historically been constructed as coastline protection devices, they do not always work effectively, and certain coastal areas such as Shuang-Chun beach in Tainan, Taiwan, continue to experience serious erosion due to damaged and ineffective structures. The necessity of shore protection has been recognized in recent years, and alternative solutions are being sought. In this paper, we present a high-strength-net device that acts as a flexible breakwater to reduce wave energy, induce sediment deposition, and offer a more economic and innovative method for coastline protection. The device is composed of concrete posts, high-strength nets, and triangular gabions filled with stones and covered with recycled vehicle tires. Three high-strength-net breakwaters have been installed at Shuang-Chun beach since 2009 as an experimental field study to investigate both the effect of sediment deposition and the stability of the proposed breakwaters. Results show that these devices have the strength and stability to withstand the impact of severe wave action, and that they act effectively as sediment retainers, thereby preventing coastal erosion. © 2015, National Taiwan Ocean University. All rights reserved.
Research Paper 2
Our technology was utilized in Thailand and monitored by a team of academics, and published in the Water Journal in March 2022
Derosion Lattice Performance and Optimization in Solving an End Effect Assessed by CFD: A Case Study in Thailand’s Beach
Thailand’s beach had a severe coastal erosion problem at the end of rock dams called the “end effect.” One of the innovative solutions to solve this problem is to use the Derosion Lattice (DL). However, since the DL performance depends on installing conditions such as angle of attack, placement position, terrain, and climate, computational fluid dynamics (CFD) was applied to assess the end effect’s occurrence and optimize the performance of DL’s installation. Based on Khao Rup Chang’s condition, a suffered beach in Thailand was used as a case study, and a free surface flow simulation was performed in the transient state using ANSYS Fluent, a CFD software, which revealed water waves flow through the beach with and without the DL installation cases. Furthermore, the CFD-assessed results indicated that the angle of attack and placement position affected the DL performance as expected. In optimization, the 15° angle of attack with the DL placement adjacent to the rock dam was the proper condition. After being applied at the actual site, the DL can help reduce erosion, increase sedimentation, and solve the end effect with excellent performance.