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I can understand how this would reduce erosion (although that benefit would seem negligible ROI vs (concrete?) wall dam engineering) but how is an undersea wal
by IG_Semmelweiss 4y ago
I can understand how this would reduce erosion (although that benefit would seem negligible ROI vs (concrete?) wall dam engineering)
but how is an undersea wall going to even partially reduce flooding, exactly?
- mcdonje 4y agohttps://archive.ph/QAij2 https://archive.ph/QAij2
- koheripbal 4y ago> So can the humble oysters really save New York City from flooding? “No, they can’t, “ says Pete Malinowski, the founder of the project...
- rcme 4y ago“But they’re a critical part of the many different interventions that need to happen.”
- xienze 4y agoHow come probably the most important intervention, building sea walls around Manhattan et al, isn't happening?
- cryptoz 4y agoI've long thought that eventually the SF Bay will be dammed, with locks, etc, at golden gate.
- sumtechguy 4y agoThere is a museum in SF that shows exactly what would happen if that were to happen. It was proposed in the early 20th century. The conclusions from those experiments they did was it does not end well for most of the bay area if that happens.
- cryptoz 4y agoWell, sea level rise from climate change isn't gonna end well for most of the bay area either.
- dendrite9 4y agoIf you're ever in the area check out the US army Corp of Engineer's Bay Area hydraulic model. It was built 70 years ago to simulate the effects of one such proposal. https://www.watereducation.org/aquapedia/san-francisco-bay-model https://www.watereducation.org/aquapedia/san-francisco-bay-m...
- rhaway84773 4y agoIt is happening. Manhattan is raising the heights of its circumference land.
- more_corn 4y agoOysters are arguably more effective than sea walls.
- inkcapmushroom 4y ago>"No, they can..."
- JumpCrisscross 4y ago> how is an undersea wall going to even partially reduce flooding They interfere with storm surges. The same way reefs force waves to break, dissipating their energy offshore.
- beedeebeedee 4y agoI'll add to that- in addition to wave breaking from shoaling (i.e., transition to shallow depths), coral reefs and oyster beds increase bottom friction. Surface waves are only the displacements on the surface that we see. The water column is also perturbed below the surface, and depending upon on the wavelength and amplitude, the perturbation can go down pretty far. If you track the water particles as the waves pass by, you would see the particles traveling up and down and back and forth in orbital motions. In shallow water (relative to the wavelength), the sea bottom prevents downward motion, so the orbital motion is flattened into a back and forth motion near the bottom, and near the surface the waves increase height and break at the top. If you have things like coral reefs or oysters (or an undersea wall), the back and forth motion is impeded, and energy from the wave is dissipated (which reduces the surface displacement). Here's an article on experiments quantifying the energy dissipation: https://www.mdpi.com/2077-1312/9/9/1007 https://www.mdpi.com/2077-1312/9/9/1007
- dghughes 4y agoMaybe they should have used sponges instead :D
- indecisive_user 4y agoLooks like it will act similar to rock armor (around 9:00 in the video) https://youtu.be/3yNoy4H2Z-o https://youtu.be/3yNoy4H2Z-o