Coast KZN

State of the Coast: KZN
State of the Coast: KZN

State of the Coast: KwaZulu-Natal Chapter 1: Introduction & Background Chapter 2: Overarching Drivers Chapter 3: Climate Variability
Chapter 4: Coastal Environment Chapter 5: Estuarine Environment Chapter 6: Marine Environment Chapter 7: Human Environment Chapter 8: Economic Environment
Chapter 9: Governance Environment Chapter 10: Conclusions
The Profile of the KZN Coast
The Profile of the KZN Coast

Ugu Lwethu- Our Coast Defining the Coastal Zone The Physical and Coastal Environment Coastal and Marine Ecosystems
Coastal and Marine Species Migrations The Human Dimension Socio-Economic Uses of the Coast Commercial Resource Uses
Pressures and Threats Management of the Coastal and Marine Environments Understanding our Coast
Coastal access
Coastal access

Access RoutesBoat Launch SitesThe Human DimensionCoastal Access: Stats & Facts
Estuaries
Estuaries

What is an Estuary? Know your Estuaries Estuary Health and Conservation KZN Estuary Observer Programme
Historical Time Series Estuary Mouth Status Sand Mining
Recreation
Recreation

Fish TaggingAccess RoutesBlue Flag Beaches
Coastal risk and vulnerability
Coastal risk and vulnerability

Coastal Risk LinesExtreme EventsCoastal ErosionKZN Coastal Vulnerability IndexPollution
Coastal issues
Coastal issues

PollutionSand MiningCoastal ErosionNurdlesUPL Chemical Spill
Coastal issues

Coastal Erosion

The KZN coast, as with many coasts around the world, is showing a general eroding trend. While this is often portrayed in a negative light, particularly when properties and infrastructure are threatened or damaged, coastal erosion is part of the natural coastal systems whereby coasts adjust to sediment availability and the ambient wave and tide conditions.

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Coastal Erosion is defined as the weathering of rocks, or removal of beach or dune sediment as a result of wave action, tidal currents or drainage. 


Coastal erosion events are driven by storm events and sea-level, amongst other factors. The KZN coast sees regular erosion on a normal spring tide, the effects of which are often exacerbated by a reduction in sediment supply. KZN is seeing a regional sand deficient due to drought, sand mining, dam construction and unwise coastal development. In addition, protection measures such as breakwaters and groynes can block the flow of sand leading to accreting beaches to the south of the structure, while beaches to the north continue to erode. 

Sections of coast considered vulnerable to erosion include: 



  • Narrow, sand depleted beaches and bays,

  • Sandy bays which are north of points, 

  • Beaches with a thin veneer of sand over rock, 

  • Beaches where the natural defence mechanisms such as foredunes, naturally vegetated dunes, offshore sand bars and reefs have been removed, 

  • Beaches with, and adjacent to, inappropriate sea defences, 

  • Beaches where the built environment is located too close to the high-water mark, and

  • Beaches with badly planned, inappropriate and poorly maintained stormwater systems.


The main management concern often relates to impacts on the built environment, public and private property and effects of livelihoods. 

Monitoring erosion 


In order to fully understand the seasonal and long-term effects of coastal erosion along the KZN coast, ORI and EDTEA have established pilot monitoring programmes for sections of coast in order to track erosion rates and recovery. Data collection for this project is ongoing and results will be made available in due course.


 


What can and cannot be done to prevent future erosion?



  • Determination of coastal management lines will ensure that development does not occur too close to the high-water mark, thus preventing further interference with natural sand movement;

  • Prevent the removal of sand from beaches; eg. Sandmining;

  • Consider green engineering in the design of sea defences, as hard engineering will result in further loss of sand;

  • Maintain and rehabilitate natural dune vegetation as this assists in stabilising the frontal dune which in turn will offer protection against storm surge and erosion;

  • Main problem is not enough sand delivery to the coast and then offshore.

View the Erosion Strategy Guide Here

Erosion Strategy Guide

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EDTEA • ORI