00000nam 2200000zi 4500 9.870651 CaOODSP 20241203113647 m o d f cr bn||||||||| 190327s1991 onca ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-qu En13-5/91-25E-PDF Rukavina, N. A., author. Acoustic mapping of contaminated-sediment thickness in Lac Saint-Louis, results of equipment trials, 1990 / N.A. Rukavina and J.S. Ford. Burlington, Ontario : National Water Research Institute = Institut national de recherche sur les eaux, [1991] 1 online resource (4 unnumbered pages, 29 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; no. 91-25 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 14-16). "Trials of three echo sounders were carried out in Saint-Louis to assess their ability to measure the thickness of modern contaminated sediments and to discriminate sediment type. Test areas were first surveyed by sounding, sampling and coring to establish ground-truth data. None of the sounders was able to meet the objective of resolving modern-sediment layers 10 cm thick. Success rates for detection of 25-cm layers were 38% (BioSonics), 17% (Datasonics) and 33% (Edo). Bottom discrimination was poor except for the Edo which was moderately successful in distinguishing fine-grained sediments from sand and exposed glacial clays. Improvements in the performance of existing equipment should be possible with better colour recording (BioSonics, Datasonics), more scale expansion (Edo, Datasonics), and post-processing to enhance record quality (BioSonics, Datasonics). The alternative is to develop a new sounder dedicated to real-time, high resolution of fine-grained modern sediments"--Abstract. Includes management perspective and abstract in French. gccst Lakes gccst Sediments gccst Measurement gccst Equipment Ford, J. S., author. Canada. Environment Canada. National Water Research Institute (Canada). Lakes Research Branch. National Water Research Institute (Canada) NWRI contribution ; no. 91-25. (CaOODSP)9.844121 PDF 2.91 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-91-25-eng.pdf