Simmons S.M.,University of Leeds |
Parsons D.R.,University of Leeds |
Best J.L.,Urbana University |
Lane S.N.,Durham University |
And 6 more authors.
Journal of Hydraulic Engineering | Year: 2010
This technical note describes use of a multibeam echosounder (MBES) to quantify the dynamics of suspended sediment in a large open channel. A methodology is detailed that uses the backscatter magnitude from the MBES water-column data to adjust the magnitude of sonar returns for the various sonar settings, spatially and temporally average the data to account for the random nature of acoustic backscatter from the suspended sediment, and calibrate the processed data with direct samples. A case study of flow at the confluence of the Rio Paraná and Rio Paraguay, Argentina, where there is a distinct turbidity difference along the mixing interface of the two flows, is used to demonstrate the unique capabilities of MBES to quantify sediment concentrations and dynamics within the water column. © 2010 ASCE.
Best J.,University of Illinois at Urbana - Champaign |
Simmons S.,University of Leeds |
Simmons S.,Aquatec Group Ltd |
Parsons D.,University of Leeds |
And 3 more authors.
Geophysical Research Letters | Year: 2010
In order to investigate the interactions between turbulence and suspended sediment transport in natural aqueous environments, we ideally require a technique that allows simultaneous measurement of fluid velocity and sediment concentration for the whole flow field. Here, we report on development of a methodology using the water column acoustic backscatter signal from a multibeam echo sounder to simultaneously quantify flow velocities and sediment concentrations. The application of this new technique is illustrated with reference to flow over the leeside of an alluvial sand dune, which allows, for the first time in a field study, quantitative visualization of large-scale, whole flow field, turbulent coherent flow structures associated with the dune leeside that are responsible for suspending bed sediment. This methodology holds great potential for use in a wide range of aqueous geophysical flows. Copyright © 2010 by the American Geophysical Union.
Myriax Software Pty Ltd and SonarData Tasmania Pty Ltd | Date: 2002-12-24
[ ECHOSOUNDERS, NAMELY, SONAR FOR USE IN TRACKING, MEASURING AND CLASSIFYING OCEAN LIFE AND OCEAN HABITATS; APPARATUS FOR RECORDING TRANSMISSIONS OR REPRODUCING SOUNDS OR IMAGES, NAMELY, PRE-RECORDED COMPACT DISCS FEATURING SOFTWARE DIRECTED TO DATA GATHERED FROM THE ECHOSOUNDER; ] COMPUTER SOFTWARE FOR USE IN DATABASE MANAGEMENT AND TO ANALYZE DATA GATHERED FROM AN ECHOSOUNDER FOR USE BY THE FISHING INDUSTRY AND SCIENTIFIC RESEARCHERS.
Myriax Software Pty Ltd. | Date: 2009-12-08
Computer software programs, namely, computer software for visualising and analysing spatial temporal data; computer software for integrating disparate types of data, defining methods of access and capture to improve re-use and sharing; computer software for merging disparate types of data and assisting segmentation thereof, generating topological models to enable use of segmented data rendered by spatial, temporal and attributed relationships; computer software for defining data flows to create analysis and visualisation techniques; computer software to enable users to define data flow functions including user developed computer software instructions, mathematical expressions and/or external software routines.