km, the process will need to be repeated fairly regularly inorder to
Learn about and revise coastal maangement and hard and soft engineering. Planted on sand dunes stabilises the dunes and helps to trap sand to build them. Picture, How it works, Advantages, Disadvantages. Marsh Creation. Managed Retreat. Sand Dune Regeneration.
maintain the coastal defense
![Soft Soft](/uploads/1/2/6/4/126467770/164578143.jpg)
Managed Retreat-
Managed retreat is a method whereby weallow the sea to erode and create land forms such as spits and salt marshes. Cliff erosion is allowed to occur in areas of low value farmland, farmersare then compensated for their losses. This method is cheaper than constructingmore expensive coastal defenses. This can only work where the coasts ofcompensation are significantly less than the coasts of building coastal defenses.
It can also be beneficial to plants and animals by providing new
habitat. The cost of this coastal defense depends
Sand Dunesoften form naturally however they are fragile and come under threat because ofpeople walking over them. Sand Dune regeneration involves using fencing to helptrap sand and planting vegetation to reinforce the Sand Dune. By encouragingthe formation of Sand Dunes the coastline is protected, this is because Sand Dunesintercept and absorb storm and wave energy. This costs around £2,000 per100m.
![Dune Regeneration Soft Engineering Dune Regeneration Soft Engineering](/uploads/1/2/6/4/126467770/129659201.jpg)
This a method that is similar toManaged Retreat, however there are no costs at all for the local authorities.This method of doing nothing and letting nature take its course only occur inuninhabited areas of the country. These areas are not considered valuable bythe government as they do not have people, houses, businesses or publicbuildings. This is by far the cheapest method of coastal defence as it coststhe local authorities nothing.