Seabed Classification and Sediment Transport on Roberts Bank

Vancouver, the largest city in western Canada, is partly located on the Fraser River Delta. The delta is under pressure from urban development and this has contributed to it being well studied. The offshore slope of Roberts Bank (Figure 1) is particularly interesting for sediment transport studies, due to its low sediment input from the river and strong tidal currents. In this area asymmetric dunes indicate a dominant NW flood current. In 2001, the upper slope and the subtidal zone of Roberts Bank were mapped using an EM3000 multi-beam to identify bedform and erosion features. Using a subset of the... (read more)
2008-01-01 01:00:00

Amplified Sediment Waves in the Irish Sea (AmSedIS)

Understanding Big Sand Wave Behaviour
Large sediment waves are striking yet poorly understood seabed features in many shelf seas. Very large sediment waves (3–18m in height) have been documented to migrate up to 70m per year in the Irish Sea and some sand waves reach heights of up to 36m (Figure 1). Such transport of enormous sediment volumes can endanger the stability of submarine pylons, cables and pipes and they cause a highly mobile benthic habitat. To understand the dynamics of these sediment waves, we identified that we need to focus our investigation on the effects of sediment grain size variability, the availability of mobile... (read more)
2014-04-07 01:31:38

Underwater Laser Scanners for Sediment Transport and Scour Analysis

Genex Systems, USA, has trialled and the purchased a 2G Robotics' ULS-100 underwater laser scanner. The objective of the trials was to test the capabilities of the ULS-100 for bridge scour experiments and sediment transport analysis. The trials were conducted at the TFHRC J. Sterling Jones Hydraulics Research Laboratory. 2G Robotics’ ULS line of underwater laser systems produce true-scale high-resolution 3D models of underwater structures and environments in real time. These 3D models function as dimensional records and serve as reliable references from which to obtain accurate measurements and information. Both stationary and dynamic scans were performed with the ULS-100.... (read more)
2016-04-20 09:56:38

USV to Map Lakes and River Sediment Movement in Norway

Swathe Services has announced that an Unmanned Surface Vessel (USV), designed and built by Unmanned Survey Solutions in Hayle, Cornwall, has been purchased by Trondheim University for research studies in Norway. The Inception Class Mark 2 USV is built by surveyors for surveyors. It’s designed for hydrographic surveys and data acquisition in ports and harbours, lakes and rivers, shallow coastal or enclosed inland areas. James Williams, managing director of Swathe Services said: “We are proud to have been selected to provide the Department of Civil Engineering with a complete Multi-Beam Echo-Sounder (MBES) system along with the USS Inception Mark II... (read more)
2018-07-10 01:25:49

Data Fusion for Inland Dredging

Present-day hydrographic surveys can result in many types of information that are used for planning inland dredging projects. Novel geophysical survey systems provide detailed information on sediment composition and pollution levels of dredge spoil. Each data set alone does not give all information needed for proper planning. The combination of data from different sensors provides practical results that can help to reduce the costs of dredging and disposal, reduce risk and improve the quality of the dredging work.<P>   Inland dredging activities require careful planning. Many inland water systems are dredged for nautical reasons, but the pollution levels of the... (read more)
2009-01-05 12:00:00

Sedimentation Estimation from ADCP Measurements

Monitoring sediment transport in a small harbour
Many harbours in tide-dominated areas silt up as a consequence of asymmetric tides. To understand the process of harbour sedimentation at tidal rivers, it is important to know the amount of transport of suspended sediment. In a small and shallow harbour along a tidal river, simultaneous ADC, OBS, CTD and water sample measurements are done for observations of suspended sediment transport. ADCP backscatter is converted to suspended sediment concentration by means of calibration with OBS, CTD and water sample data. Sediment fluxes are calculated by multiplication of SSC by ADCP discharge data for a total of more than three hundred... (read more)
2008-01-01 01:00:00

Reused 2007 Focuses on Contaminated Sediments

Public-Private cooperation in Sediment Remediation is the theme of the fourth European Conference on Contaminated Sediments, to be held 20th to 22nd June 2007. The Antwerp Harbour House is the conference venue, overlooking the oldest commercial port of Antwerp. The conference focuses on prevented contaminated sediments to be spread after disposal in waterways or sea. The programme includes subjects like politics, business and sediments; international experiences; scientific, research and surveying and monitoring; projects, applications and case stories. There will be several excursions around the theme. Key note speaker is Marc van Peel, Senator in Belgium and Alderman of the City... (read more)
2007-05-04 12:00:00

Coastal Sediments Conference 07: 30 Years

The Coastal Sediments 07 conference is the sixth in the series following the inaugural conference in 1977. The Coastal Sediments technical specialty conferences provide an international forum for exchange of information among coastal engineers, geologists, marine scientists, shallow-water oceanographers, and others interested in the physical processes of coastal sediment transport and morphology change. Coastal Sediments 07 will offer presentations and Proceedings as a professional learning experience with a legacy of a frequently consulted Proceedings volume. The theme of Coastal Sediments 07 is ‘Coastal Engineering and Science in Cascading Spatial and Temporal Scales’, chosen to stimulate research and papers devoted to... (read more)
2007-02-07 11:26:12

Pollutant Transport Studies

The Scottish Association for Marine Science (SAMS) is undertaking research into the transport and pathways of pollutants along a latitudinal gradient from Scotland to the Yermak Platea UN (Arctic Circle). Sediment geochemistry studies will form an important part of the programme and SAMS has ordered a Bowers and Connelly Maxi Corer from OSIL for this purpose. The Maxi Corer was chosen for its ease of use and reliability in collecting undisturbed, high-quality sediment samples. Each of the eight sediment cores obtained per deployment contains both sediment and an overlying supernatant, providing an unique insight into the sediment-water interface and preserving... (read more)
2004-03-03 12:00:00

Monitoring Sludge Disposal

Dredging is essential to maintain navigation in ports and harbours. Much of the material that is removed during dredging is clean enough to be disposed of in open water depots at sea. According to the protocol defined in the London Convention (1972 and 1996), the impacts of these open water depots on the surrounding environment have to be monitored. Thus far, monitoring of sediment mobility and sediment transport has mainly been carried out by point measurements. These measurements provide only limited information and sometimes require ambiguous extrapolations. With the development of systems that provide high-resolution, quantitative information of morphology and... (read more)
2008-01-01 01:00:00
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