Why is managed retreat bad?
Causes controversy due to lack of understanding. Requires large initial financial investment. Requires long term planning. Requires community buy-in and cooperation of multiple agencies.
Is managed retreat good?
This is a cheap option compared to paying for sea defences. Creates a salt marsh which can provide habitats for wildlife and a natural defence against erosion and flooding. Salt marshes are diverse ecosystems supporting many species.
What is the point of managed retreat?
Managed retreat involves the purposeful, coordinated movement of people and buildings away from risks. This may involve the movement of a person, infrastructure (e.g., building or road), or community. It can occur in response to a variety of hazards such as flood, wildfire, or drought.
Is managed retreat soft or hard engineering?
Soft engineering techniques involve working with nature to manage the coastline. Techniques include cliff stabilisation, dune regeneration and managed retreat.
What are the disadvantages of managed realignment?
One of the biggest drawbacks of managed realignment is that the option requires land to be yielded to the sea. This may require the relocation of important infrastructure or buildings, potentially at significant cost. Alternatively, the land may be able to be used in other ways, such as for recreation.
What are the disadvantages of dune regeneration?
During dune regeneration, the land needs to be carefully managed so that any new vegetation that is planted is appropriately protected from trampling by humans. This could involve temporarily fencing off the dunes or by providing wooden walkways. It can also be damaged by storm waves.
What are the advantages of groynes?
Groynes
| Advantages | Disadvantages |
|---|---|
| Prevents longshore drift moving beach material along the coast. Allows the build-up of a beach. Beaches are a natural defence against erosion and an attraction for tourists. | They can be unattractive. Costly to build and maintain. |
Is groynes hard or soft engineering?
Examples of hard engineering include: Groynes – Low walls constructed at right angles to retain sediments that might otherwise be removed due to longshore drift. These structures absorb or reduce the energy of the waves and cause materials to be deposited on the updrift side of the groyne facing the longshore drift.
Are groynes expensive?
Groynes (as seen at Seaton Sluice!) are basically wooded fences that run at right angles to the beach. They are good because they result in a larger beach, which not only protects the coastline but can also be good for tourism. In addition, they are not that expensive.
Is managed retreat expensive?
Although the land owners will have to be compensated for the loss of their land, managed retreat is still much less expensive than protecting the area. Although managed retreat and re-alignment are low-cost and effective, they are not aways popular.
How is managed retreat sustainable?
Managed retreat or managed realignment is a coastal management strategy that allows the shoreline to move inland, instead of attempting to hold the line with structural engineering. Usually, natural coastal habitat is preserved seaward of the man-made defense, and it provides extra protection or a buffer from flooding.
What are some disadvantages of sand dunes?
Disadvantages
- Can be easily damaged by storm waves.
- Areas have to be zoned off from public while it grows.
- Protection is limited to small area.