Identification

Dynodydd

Identifier

NRW_DS115295

Teitl Amgen

Alternative Title

• Gweithrediad ac adferiad creigresi biogenig a ffurfiwyd gan Sabellaria alveolata

Laith Metadata

Metadata Language

English

Lineage

Detailed field observations were undertaken at three reef sites within Wales, see Geographic Coverage for site area. Each of the sites were photographed using aerial photography. Wave attenuation was assessed using high-resolution pressure sensors capable of measuring water depth at less than 5 mm accuracy in water depths of up to 15 m at a rate of four samples per second. Sensors were deployed at the three sample sites in two transects, one sensor before a reef structure and one sensor up shore, above the reef structure. Two sensors were placed at the same shore heights in an area where reef was absent to act as a control. To supplement wave exposure measurements, two further approaches were also employed. The first was plaster clod dissolution. Shore stability was assessed by observing the movement of labelled cobbles at each site. Two lines of cobbles (n = 10) were lain out at identical shore heights across the on and off-reef areas. These were tagged with dGPS with a residence time of 1 minute that provides a post-processed horizontal accuracy of approximately 30 cm. Cobbles were left for several tidal cycles before being located and re-tagged with the dGPS. The distance moved was calculated using great circle distance calculations in Microsoft Excel. Vortex resuspension tanks were also used within the investigation as well as investigating larval settlement and growth through induced spawning.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

Dataset Reference Date (Publication)

2013-03-31

Extent

Extent

Hyd

Geographic Extent

Wales (WLS)

N

W

E

S

 

Distribution

Quality

Keywords

Spatial Reference System

Content

Constraints