hard engineering Flashcards
what is hard engineering?
man made structures that aim to prevent erosion and are often very effective at preventing erosion in the desired area
what are the three disadvantages of hard engineering?
high cost
significant environmental impacts due to use of concrete and other materials
reducing erosion in one area of the coastline but may exacerbate erosion elsewhere
what is the description of a groyne and what are the pros and cons?
Description: Timber or rock protrusions that trap sediment from LSD
👍 Builds up beach, protecting cliff and
increasing tourist potential
👍 Cost effective
👎 Visually unappealing
👎 Deprives areas downwind of sediment increasing erosion elsewhere
what is the description of a sea wall and what are the pros and cons?
Description: Concrete structures that absorb and reflect wave energy, with curved surface
👍 Effective erosion prevention
👍 Promenade has tourism benefits
👎 Visually unappealing
👎 Expensive to construct and maintain
👎 Wave energy reflected elsewhere, with impacts on erosion rates
what is the description of revetments and what are the pros and cons?
Description: Wooden or concrete ramps that help absorb wave energy
👍 Cost effective
👎 Visually unappealing
👎 Can need constant maintenance, which creates an additional cost
what is the description of rip rap/rock armour and what are the pros and cons?
Description: Large rocks that reduce wave energy, but allow water to flow through
👍 Cost effective
👎 Rocks are sourced from elsewhere, so do not fit with local geology
👎 Pose a hazard if climbed upon
