Catégories : Tous - erosion - deposition - protection - engineering

par Erin Kimbrell Il y a 12 années

539

coast

Coastal environments are shaped by a variety of natural agents and processes such as currents, tides, and waves. These forces can either be destructive, causing erosion through mechanisms like hydraulic action, attrition, solution, and abrasion, or constructive, leading to the formation of coastal features like spits, beaches, and tombolos through deposition and longshore drift.

coast

coast

coastal processes

deposition
forms

tombolos

spits

beaches

transportation
longshore drift

forms spits

erosion
attrition
solution
abrasion
hydraulic action

coastal protection measures

soft engineering
planting of mangroves
growth of coral reefs
stabilising dunes

minimises erosion

protects coastal properties

provides habitat for some animals

adds greenery and beauty to coast

beach nourishment
hard engineering
gabions

found along Hornsea Beach[holderness,england]

wire cages filled with crushed rocks

groynes

built at right angle of coast

st Leornards beach[canada]

low walls built of concrete or wood

breakwaters

create zone of calm water between them and the beach

east coast park

built of concrete

seawalls

Esplanade

hard engineering: involves the construction of physical structures

absorb wave energy

made of concrete

Agents Shaping Coast

currents
tides
waves
destructive
constructive