High spring tides are on average 0.8 metres greater than the high neap tides in Rimouski. This generates weak tides called neap tides, with a tidal range of 1.73 metres in Rimouski. The high tide caused by the moon arrives at the same time as the low tide caused by the sun. On the other hand, when the sun and moon are at right angles to the Earth (first and last quarter of the moon), their effects on the tides are offset. The last quarter moon, which corresponds to neap tides, is not shown, as it is similar to the first quarter, but with the moon on the other side of the Earth. This generates strong tides called spring tides, with a tidal range of 3.35 metres in Rimouski.Ĭycles of spring and neap tides. The high tide caused by the moon arrives at the same time as the high tide caused by the sun. When the sun and moon are on the same side of the Earth (new moon) or on opposite sides (full moon), their effects on the tides add up. Like the moon, the tides caused by the gravitational pull of the sun generate two high and two low tides each day, but with a lower tidal range: 0.81 metres in Rimouski. In Rimouski, Que., the tidal range of the semi-diurnal tide caused by the moon is 2.54 metres. The tidal range is the difference between successive high and low tides. The moon generates two high and two low tides per day, known as a semi-diurnal tide. Although the moon is much smaller than the sun, it is also much closer to the Earth, so its force of attraction outweighs that of the sun. The gravitational pull of the moon is stronger than the sun’s. To that end, it is necessary to understand the workings of the astronomical tide. However, it is possible to predict the times of the year when exceptional high tides are most likely to occur. This makes it impossible to anticipate well in advance the next co-occurrence of high astronomical and meteorological tides along the St. In contrast, high meteorological tides are associated with storms, and are only predictable a few days in advance, with considerable uncertainty about their magnitude. Great astronomical tides are predictable decades or even hundreds of years in advance, because the movements of the stars are well known. To generate exceptional high tides, both astronomical and meteorological tides must occur at the same time. Université du Québec à Rimouski (UQAR) provides funding as a member of The Conversation CA.īut changes in sea level can also be caused by variations in air pressure and winds. Université du Québec à Rimouski (UQAR) provides funding as a founding partner of The Conversation CA-FR. Professeur-chercheur en océanographie physique, Université du Québec à Rimouski (UQAR)Ĭédric Chavanne has received funding from the Natural Sciences and Engineering Research Council of Canada (NSERC), the Fonds de recherche du Québec - Nature et technologie (FRQNT), the Marine Environmental Observation, Prediction and Response (MEOPAR) network, and of the Quebec Maritime Network (RQM).ĭaniel Bourgault has received funding from the Natural Sciences and Engineering Research Council of Canada, the Fonds de recherche du Québec - Nature et technologie (FRQNT), the Canadian Foundation for Innovation, the Marine Environmental Observation, Prediction and Response (MEOPAR), and the Quebec Maritime Network (RQM).ĭany Dumont is Executive Director of the Quebec Maritime Network He holds and has received funding from the Natural Sciences and Engineering Research Council of Canada (NSERC), the Quebec Research Fund - Nature and Technology (FRQNT), the Marine Network Environmental Observation, Prediction and Response (MEOPAR), the Quebec Maritime Network (RQM) and several provincial and federal departments (Ministry of Public Security of Quebec, Ministry of Transport of Quebec, Environment and Climate Change Canada, Fisheries and Oceans Canada). Professeur en océanographie physique, Université du Québec à Rimouski (UQAR)
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