Vector advancing sediment flux knowledge
Nortek’s Doppler instrumentation is helping university students understand sediment transport processes.
Ocean Sciences students at Bangor University in the UK are using the Nortek Vector Doppler velocimeter, an externally mounted optical backscatter sensor (OBS) and a pressure transducer (PT), to observe temporal patterns of sediment flux at Laugharne Estuary in South Wales.
Dr Martin Austin, lecturer in coastal sediment dynamics at Bangor University, said the students will acquire important skills to undertake field deployments and conduct analysis of numerical datasets.
The Vector is set to operate in burst-mode, recording 10 minutes of data at 4 Hz every 15 minutes.
To enable the students to compute the near-bed suspended sediment flux, Bangor University’s team position the sensor head of the Vector together with the OBS around 20cm above the bed, while a PT flush positioned on the bed records even in very shallow water.
All the data is logged internally by the Vector during its burst operations.
Each day, a small group of students service the Vector, checking sensor alignments, clearing any weed deposits and downloading ‘their’ data from the previous 24-hour period.
Back in the laboratory, students write Matlab code to analyse the data and compute the suspended sediment flux during the field course.
Survey data, collected by successive generations of students, indicate that the Laugharne Estuary is infilling with fine marine sand at a rate of 1-2cm per year.
The sediment transport results primarily from strong asymmetric tidal currents causing the influx of sand from Carmarthan Bay on the dominant flood tide.
By Rebecca Jeffrey
Latest Press Releases
Innovative vessel for CEMEX UK is first of next generation of marine aggregate dredgers Read more
MIT deliver Bespoke Exhaust Suspension System by Rubber Design for Sir David Attenborough Research Vessel
MIT has successfully delivered a bespoke exhaust suspension system to Cammell-Laird Shipbuilders in ... Read more
Damen has delivered two of four ASD 3212 tugs to towage and related marine services’ company Smit La... Read more
International equipment supplier Oceanscan has added underwater acoustic positioning technology from... Read more
Welders from Damen Shipyards Galati in Romania recently took part in the 2018 Arc Cup International ... Read more
The 326-metre, 146,000 DWT, cruise ship Norwegian Breakaway arrived in Brest on 28 April for 11 days... Read more