tema system understanding · tema past: erosion 24 februari 2017 boateng (2012) potential causes -...
TRANSCRIPT
Tema coastal system
Prof. Kwasi Appeaning-Addo
Ir. Wiebe de Boer
24 februari 2017
9 February 2017
Ecosystem Services (+/-)
Ecosystem Services (+/-)
Coastal system dynamics (changing)
24 februari 2017
Sediment (sand) transport: from West to East
24 februari 2017
Ly (1981)
Tema sediment budget (book keeping)
24 februari 2017
Tema sediment budget (book keeping)
24 februari 2017
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Sediment budget principles: stable coastline
24 februari 2017
Sediment in Sediment out
Initial coastline
Coastal cell
Tema
Sediment budget principles: coastline accretion
24 februari 2017
Sediment in Sediment out
Initial coastline
Coastal cell
Tema
Sediment budget principles: coastline erosion
24 februari 2017
Sediment in Sediment out
Initial coastline
Coastal cell
Tema
Tema past: erosion
24 februari 2017
Boateng (2012)
Potential causes - Sand mining - River damming - Coastal constructions - Sea level rise
Tema present: stabilized, sandy beaches scarce
24 februari 2017
Human interventions
Natural rock outcrops
Tema future: climate change
24 februari 2017
Appeaning-Addo et al (2008)
Port impacts
24 februari 2017
Sediment in Sediment out
Initial coastline
Coastal cell
Accretion
Downdrift Updrift
Erosion
Port impacts Lome
24 februari 2017
Port impacts Tema
24 februari 2017
Wrap-up
• The coastline is a dynamic feature
• Human interventions affect coastline position – Sand mining
– River damming
– Coastal constructions (ports)
• Sand is scarce
24 februari 2017
Past
Present
Future
Erosion Stabilization Climate Change
9 February 2017