00000nam 2200000zi 4500 9.921857 CaOODSP 20231003150327 m o d f cr mn||||||||| 230421t20232023oncab ob f000 0 eng d 9780660484471 CaOODSP eng rda CaOODSP n-cn-qu x7y2 NR16-420/2023E-PDF Barrette, Paul Dominique, 1959- author. Overview of water level, discharge and ice in the St. Lawrence Seaway at Montreal / Paul Barrette and Cédric Gaïqui. [Ottawa] : National Research Council Canada = Conseil national de recherches Canada, 2023. ©2023 1 online resource (vii, 27 pages) : illustrations (chiefly colour), colour maps text txt rdacontent computer c rdamedia online resource cr rdacarrier "Report No.: NRC-OCRE-2022-TR-036." "April 2023." "Ocean, Coastal and River Engineering Research Centre." Includes bibliographical references (pages 19-20). "Unlike in most other countries, rivers in Canada freeze during the colder months of the year. Hence, in addition to flooding events in open water, which are a challenge on their own, those involving ice introduce an additional set of issues which are also difficult to foresee and prepare against, given the acknowledged complexity of river ice dynamics. The purpose of this report is to examine the influence of surface ice on water levels in the St. Lawrence River, with the premise that an improved understanding of related phenomena would ultimately increase the reliability of the well-known stage-discharge relationships in winter conditions and provide additional insights into floods induced by ice. Fundamental to any endeavor aimed at monitoring water levels are basic principles in hydrology and hydraulics, including the various field methods used to gather these data – these are summarized. The basis for the relationship between stage and discharge is the Manning formulation. When ice is present, however, that relationship is no longer reliable. Instead, the presence of ice can lead to very high-water levels at relatively low discharge, which is caused by channel constriction by ice keels below the water surface. Lake St. Louis, a river segment along the St. Lawrence Seaway next to Montreal, is the target area for a site-specific analysis presented in this report …"--Summary, page iii. Hydraulic measurements Québec (Province) Saint Louis, Lake. Ice on rivers, lakes, etc. Environmental aspects Québec (Province) Saint Louis, Lake. Mesures hydrodynamiques Québec (Province) Saint-Louis, Lac (Roussillon) Glace sur les cours d'eau, lacs, etc. Aspect de l'environnement Québec (Province) Saint-Louis, Lac (Roussillon) National Research Council Canada, issuing body. PDF 2.98 MB https://publications.gc.ca/collections/collection_2023/cnrc-nrc/NR16-420-2023-eng.pdf