World's highest tides: Hypertidal coastal systems in North America, South America and Europe

Abstract

Hypertidal systems can be defined as areas where spring tides have ranges greater than 6. m. These very high tidal ranges results in unique patterns of sedimentation within hypertidal estuaries. Such systems are not common but they do occur on a number of continents. This report will discuss six areas that have the highest tides in the world. North America hypertidal systems occur within Cook Inlet in Alaska, USA, Leaf Basin in Ungava Bay, Quebec Province, Canada, and the Bay of Fundy, Nova Scotia and New Brunswick, Canada. In South America, the Straits of Magellan and associated Atlantic coastal settings exhibit hypertidal conditions. European hypertidal systems include Bristol Channel and Severn estuary in southwest England and the Gulf of St. Malo in Normandy, France. These six areas have the highest tides in the world and spring tidal ranges that regularly exceed 10. m. All the six areas can be divided into intertidal sedimentological zones. Zone 1 is the outermost zone and contains longitudinal bars. Zone 2 exhibits laterally extensive sand flats. Zone 3 includes the innermost extent of tides and estuarine point bars. Annual and neap-spring cycles have been documented in Zone 3 and are probably the most indicative features of hypertidal systems. The North American systems occur in high-latitude cold climates where winter ice can have a minor or major impact on the development of sedimentary facies. Conversely, the European and Patagonia systems have climates minimal ice formation. © 2012 Elsevier B.V.