3
3.08 Marine Science
TYPE OF EROSION CONTROL
PROS OF USING THIS CONTROL
CONS OF USING THIS CONTROL
Jetties
- Designed to coastal properties.
-“The increased wave energy and the sediment trapped behind the seawall often decrease the sediment supply near the seawall, causing erosion on adjacent beaches. Therefore, alternatives to these hard structures are strongly encouraged and actively sought by the NPS.”
Breakwaters
-“Dunes not directly disturbed, increases area of dry upper beach, may allow new fore dunes to stabilize. Unlimited structure life.”
-Low maintenance
-“Visually intrusive, alter upper beach morphology, may cause fine sediment, seaweed or debris to accumulate along upper beach. Can cause locally strong currents and may be a hazard to beach users.”
-High cost
Beach Nourishment
-“Erosion protection without hard structures. Natural beach processes retained. Recreational value of beach enhanced.”
-Moderate to high cost
-“Appropriate materials may be unavailable or expensive. Dissimilar imported material may alter geomorphology or ecology. Sand may be blown inland causing a nuisance.”
Planting of dune grasses and plants
-Low cost
-“Reservoir of sand held in planted fore dunes will provide a buffer to resist storm erosion.”
-“Compliments natural system. Can be used to improve other management options. Potentially self-sustaining.”
-“Normally requires dune fencing or thatching to achieve success. May be completely lost to storm erosion.”
Credits- Excerpts taken from: http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.2.shtml http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.11.shtml http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.7.shtml http://www2.nature.nps.gov/geology/coastal/hardeng.cfm
My paragraph:
Personally, if you really want my opinion, I believe that humans should not be interfering with nature just because we will have less space or that it will
TYPE OF EROSION CONTROL
PROS OF USING THIS CONTROL
CONS OF USING THIS CONTROL
Jetties
- Designed to coastal properties.
-“The increased wave energy and the sediment trapped behind the seawall often decrease the sediment supply near the seawall, causing erosion on adjacent beaches. Therefore, alternatives to these hard structures are strongly encouraged and actively sought by the NPS.”
Breakwaters
-“Dunes not directly disturbed, increases area of dry upper beach, may allow new fore dunes to stabilize. Unlimited structure life.”
-Low maintenance
-“Visually intrusive, alter upper beach morphology, may cause fine sediment, seaweed or debris to accumulate along upper beach. Can cause locally strong currents and may be a hazard to beach users.”
-High cost
Beach Nourishment
-“Erosion protection without hard structures. Natural beach processes retained. Recreational value of beach enhanced.”
-Moderate to high cost
-“Appropriate materials may be unavailable or expensive. Dissimilar imported material may alter geomorphology or ecology. Sand may be blown inland causing a nuisance.”
Planting of dune grasses and plants
-Low cost
-“Reservoir of sand held in planted fore dunes will provide a buffer to resist storm erosion.”
-“Compliments natural system. Can be used to improve other management options. Potentially self-sustaining.”
-“Normally requires dune fencing or thatching to achieve success. May be completely lost to storm erosion.”
Credits- Excerpts taken from: http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.2.shtml http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.11.shtml http://www.snh.org.uk/publications/on-line/heritagemanagement/erosion/appendix_1.7.shtml http://www2.nature.nps.gov/geology/coastal/hardeng.cfm
My paragraph:
Personally, if you really want my opinion, I believe that humans should not be interfering with nature just because we will have less space or that it will