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Wexford
Loch Garman

Location

Wexford is located in the South-East of Ireland.

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INFOMAR Survey History

Survey coverage has been achieved over a large area of the seabed off the Wexford coast. The RV Celtic Voyager mapped the offshore areas. The harbour was mapped by the RV Keary, RV Tonn & RV Geo in 2011 and 2015. Bannow Bay & Kilmore Quay were surveyed in 2015. The RV Keary, RV Tonn & RV Geo surveyed around the coast of Courtown in 2016.

Further surveys offshore to the south were carried out by the Celtic Voyager in 2016.

Coverage from the survey legs of Wexford Harbour and coast (Click on image for more detailed map).

Survey Coverage polygons can be downloaded as a shapefile from our Interactive Web Data Delivery System (IWDDS).

Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

Read more about some of the survey legs on our Blog by clicking on the links below.

CV09_03 Survey off Wexford coast

CV10_02 Wexford Waterford and Cork

Kilmore Quay, Wexford & Rosslare Surveys

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Bathymetry (Water Depth)

Detailed .pdf charts of the bathymetry of Wexford can be downloaded by clicking here

Detailed .pdf charts of the bathymetry of Waterford Harbour & Bannow Bay

You can download Bathymetry xyz data from IWDDS

(Data Type: Vector Datasets, Region: Offshore, Theme: Bathymetry (Survey Leg) entire survey leg or Bathymetry (Survey Line) for individual tracklines. Take note of the survey names in INFOMAR Survey History.

You can also download the bathymetry data in ArcGIS GRID format

 

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Shaded Relief

The 3D appearance is achieved using software called Fledermaus. By using some vertical exaggeration, artificial sun-shading (usually as if there is a light source in the nw 315°) and colouring the depths using various colour maps, it is possible to highlight the subtle relief of the seabed. This helps us to quickly understand the variation in depths.

Detailed MBES shaded relief image of the seabed off the Great Saltee Island showing large-scale, symmetrical sand waves with sinuous and some biforcated crests. This seabed feature indicates that sediments are being transported in the area, probably by tidal currents.The wavelength of the sand waves is up to 260 metres and are laterally continuous for up 4 kilometres, perhaps longer as multibeam coverage finishes. Amplitudes of 4 metres for these sand waves have been measured from shallow seismic data from the area. (Click on image for more detailed map)

EM3002 multibeam image of sandwaves and bedrock in an area known as The Bailies.

 

The sandwaves are located south southwest of Carnsore Point and are characterised by having sinuous bifurcating crests. Sandwaves indicate that the predominant current direction east of Carnsore Point is north-south and south-north and west of Carnsore Point it is west-east and east-west.

EM3002 multibeam image of symmetrical sandwaves and associated scours.

Widespread faulting is observed in the outcrop.

All of our Charts for Wexford can be downloaded in pdf format from this page.

Detailed .pdf charts of the bathymetry of Waterford Harbour & Bannow Bay.

Download Shaded Relief Bathymetry Geotiffs from our Interactive Web Data Delivery System (IWDDS)

Select your area of interest.Offshore Geotiffs - Bathymetry Shaded Relief Geotiffs.

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Backscatter

Multibeam Systems also collect additional information, including the strength of the acoustic signal (or return) from the seafloor. This is known as Backscatter. Differing seafloor types, such as mud, sand, gravel and rock will have different Backscatter values depending on the amount of energy they return to the sonar head. Rocky areas will typically have high returns while soft sediments like mud are more likely to absorb energy and have low Backscatter returns. These differing values are used to generate a grey-order image (i.e. dark for high returns, bright for low returns) of the seabed which can be used to examine the nature of the seafloor.

Overview backscatter image of the seabed surveyed off the Wexford coast. The convention used is that dark areas are relatively harder and light areas relatively softer. Areas of sandy substrate correspond to the bright areas. Linear dark areas running parallel to the sandwaves are areas of relatively harder substrate and are interpreted to be scours formed by strong currents cascading over the sandwave crests (See in the image below). Outcrop is widespread south of Carnsore Point and also around Tuskar Lighthouse.

Detailed .pdf backscatter charts can be downloaded by clicking here

Detailed .pdf charts of the bathymetry of Waterford Harbour & Bannow Bay

Download Backscatter Geotiffs from our Interactive Web Data Delivery System (IWDDS)

Select your area of interest.Offshore Geotiffs - Backscatter Geotiffs.

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Ground Truthing/Seabed Sampling

To verify the results of remotely sensed sonar data, it is important to collect physical sediment samples from the seabed. These may be from the surface where grabs are used or may penetrate through the seabed and retain the vertical structure of the sediment by using various coring methods. These samples are also critical for the confirming seabed classifications.

Seabed sampling was undertaken in 2010, 2011 & 2012 by the Celtic Voyager. These were taken using a shipek grab sampler and some grab samples were obtained in 2005.

Sediment sample recovered from the seabed using a Shipek Grab on the Lucifer Bank as part of the ground truthing east of Wexford Harbour. The samples help determine the seabed classification classes.

Sample locations can be downloaded as a shapefile from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

 

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Seabed Classification

Seabed classification is an advanced process in which a backscatter image is interrogated using special software in order to divide it into areas which have similar characteristics. Areas which have a similar nature are grouped together and divided into separate classes. These classes are colour coded and developed into seabed classification charts.  

The classification of the multibeam dataset from the Wexford coast resulted in the creation of a 3 class classification.

Seabed Classification Chart for Wexford(Click on image for more detailed map)

Further information about the classification process can be found in the Data Processing section.

For a more detailed .pdf chart of the seabed classification of Wexford click here

You can download the Seabed Classification in ArcGIS GRID format data from IWDDS

(Data Type: ArcGIS GRIDS, Region: Offshore ArcGIS, Theme: Seabed Classification ArcGIS GRID

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Geology

Wexford Geology
The rocks in this part of Wexford are mostly sedimentary in nature, apart from an area of granite around Carnsore Point and other igneous rocks such as diorite (turquoise colour on the map). The area also contains many north-south trending faultlines. The modern sediments of the seabed, which one day will also form hard sedimentary rocks, exhibit large scale sand waves which reflect the strong current regime in the area – these structures, which are not unlike dunes in a desert, can be seen here in the seabed data. They are constantly migrating along the ocean floor as the currents push the sand grains along the faces of these underwater dunes.

Bannow Bay Geology
Bannow Bay is located in an area of ancient slate, a rock that was formed during the Cambrian period. Either side of the entrance, along the coast, this slate gives way to different rocks formed at other times. Travelling west, the coastal bedrock becomes Old Red Sandstone, a famous rock formation that was formed during the Devonian period, whereas to the east, a mixture of slates, quartzites and sandstones can be found, seperated from one another by fault lines.

Onshore Bedrock Geology shapefiles can be downloaded from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Onshore - Bedrock

Offshore Geology shapefiles can be downloaded from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

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Shipwrecks

To view the shipwrecks in Google and to download Shipwreck Information Sheets please click here

Shipwreck locations can be downloaded as a shapefile from our Interactive Web Data Delivery System (IWDDS).

On the IWDDS Select your area of interest. Vector datasets - Offshore - Offshore Shapefiles

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INFOMAR in Google Maps/Earth

To view and navigate around the Wexford dataset in Google Maps/Earth, click here

Image of INFOMAR multibeam data for Wexford Harbour in Google

Image of INFOMAR multibeam data for Wexford Harbour in GoogleImage of INFOMAR multibeam data for Wexford Harbour in Google

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Data Access

Full details outlining the process to gain access to datasets for the bay above or all INFOMAR data can be found in the INFOMAR | Data page of this website.

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Return to Survey Details Map

 

Follow these links to your area of interest on the INFOMAR website:

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