00000nam 2200000zi 4500 9.877086 CaOODSP 20241203113650 m o d f cr ||||||||||| 190726s1990 oncad #ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- n-us--- En13-5/90-143E-PDF Engel, Peter, 1938- author. Preliminary tests for the ISO-kinetic calibration of the DH-81 suspended sediment sampler / by P. Engel and I.G. Droppo. Burlington, Ontario : National Water Research Institute = Institut national de recherche sur les eaux, [1990] 1 online resource (iv, 22 pages, 19 unnumbered pages) : illustrations, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; 90-143 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 21-22). "Dimensional considerations and detailed tests in a towing tank were used to determine the response of the US DH-81 suspended sediment sampler to flow velocity. The data revealed a clear relationship between sampling rate and the size of the air exhaust port for the operating range of this instrument. It was observed, that the importance of the diameter of the air vent relative to the inside diameter of the intake nozzle decreased as their ratio increased, indicating that there is a transition point between nozzle control and air vent control governing the inflow to the sampler. It was further shown, using dimensional analysis, that a single dimensionless calibration curve can be established which is valid at all water temperatures likely to be encountered during measurements in the field. Further tests are recommended to determine the effect of nozzle diameter on the dimensionless calibration curve and the control regime of the D-77, DH-81 and other samplers used by data gathering agencies"--Summary, page iii. Includes summary and management perspective in English and French. gccst Sediments gccst Measurement gccst Scientific equipment Droppo, I. G., author. Canada. Environment Canada. National Water Research Institute (Canada) NWRI contribution ; 90-143. (CaOODSP)9.844121 PDF 3.20 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-90-143-eng.pdf