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