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Dunedin City Council – Kaunihera-a-rohe o Otepoti

Table of contents

Topographical GPS survey

Read the Effects Of Topography On Wind Flow And Sand Transport & Development Options - Ocean Beach Domain report in the related information section

Information on dune position, beach elevations and volumes over the total four-kilometre length of Ocean Beach is required for a number of reasons including:

  • Base information required for computer modelling of sediment transport, shoreline response and plan shape evolution.
  • Determining the long-shore variability of recent beach and dune changes since the ORC airborne LIDAR survey in 2004. This is required for calibration of shoreline response and plan shape evolution modelling.
  • Determining medium term changes to beach elevations and dune positions at the location of the six ORC profile sites at Ocean Beach, which have been surveyed periodically since 1989.

Bathymetric survey of the near-shore environment

Read the Ocean Beach Dunedin A numerical study of the coastal dynamics report in the related information section

Information on the near-shore seabed topography is required for input into modelling of wave refraction, sediment transport, storm response and recovery, and sea level rise effects. There is existing information showing levels at 10 metre depth intervals, which is sufficient for offshore areas, but not detailed enough for the near-shore areas for depths less that the 20 metre contour.

Review of coastal processes data

Read the Ocean Beach Restoration Project: Annotated Bibliography Of Coastal Processes And Shoreline Changes report in the related information section

A collection of useful data and information on coastal process and beach responses.

Determine sediment characteristics

Information on sediment size and sorting is required for input into the sediment transport and beach response modelling, and for evaluation of some possible protection options, such as beach re-nourishment.

Cam-Era site reports

Read the Ocean Beach Restoration Project: Cam-Era Report and CamEra images used to map time series changes in feature locations reports in the related information section

Changes in near-shore bar formation and rip cell location are important for determining the presence and location of erosion "hot spots" along the shore. The best way for collecting information on the nature and scale of these changes is to establish a Cam-Era site. This is the automated collection of digital images of the shorelines and surf zone at hourly intervals from a fixed site.

Risk Assessments

Read the Ocean Beach Risk Assessments for 2011 & 2090 report in the related information section

This report assesses the likelihood of tsunami, stormsurge, groundwater, human or seismic damage breaching the Ocean Beach dunes or St Clair sea wall.

GIS mapping of past shoreline positions

Read the Ocean Beach Restoration Project: Historical shoreline positions report in the related information section

The mapping of past shorelines over the whole length of Ocean Beach identifies the scale to which human interventions have affected shoreline position and shape, such as the influence of the St Clair Sea Wall, Middle Beach landfill and sports field development activities, and the construction of John Wilson Drive.

Determine landfill rubble locations and extent

View the Kettle Park - Extent of landfill - 1947 , Kettle Park - 1947 aerial with current sportsfield overlay , Ocean Beach, Dunedin Coastal Buffer Zone Ground Contamination Assessment reports in the related information section

Surveys of the dune environment at Kettle Park and John Wilson Road to determine the extent of rubble buried under the dune system that may be exposed with future shoreline movements (also see Historical/cultural/social research below).

Analysis of potential sand sources

Read the Ocean Beach Restoration Project: Sediment Report in the related information section

A number of the possible long term options will require additional volumes of sand to be placed on the coast or in the near-shore at Ocean Beach for beach re-nourishment. This report investigates risks to adequate supply, including volume, suitability such as grain size, colour and lack of contaminants, transport routes and methods, whether road, pipeline or boat, dumping location such as behind or on the beach, or in near-shore and possible storage options.

Historical/cultural/social research

Read the The Geomorphology of the Ocean Beach Dune System – Implications for Future Management of Ocean Beach Domain report in the related information section

This report examines the natural character of the Ocean Beach dune system prior to human intervention, changes in ecology and infrastructure and management implications.

Read the An overview of the history of human intervention at Ocean Beach, and other factors that may have contributed to the current erosion issues report in the related information section

This research into the historical, cultural and social aspects of Ocean Beach. Includes a bibliography of historical and cultural information on Ocean Beach.

This research also provides an historical review of documents, files and photos of Ocean Beach Dunes and hinterland including Kettle Park Landfill and Sports Field Development. This allows a more complete understanding of the modification of the Ocean Beach dunes by human intervention and better understanding of the changes that have lead to the current situation.

Community Aspirations

Read the An Overview of Key Community Aspirations for Ocean Beach and the Foreshore and Domain report in the related information section

This report summaries consultation with key stakeholders of this area regarding their aspirations for Ocean Beach.

Ecological assessment

Read the Ecological Assessment report in the related information section

This ecological assessment provides us with advice on options for appropriate ecological management for the rehabilitation of areas likely to be affected by physical works, re-nourishment programmes and recreational use.

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