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- W2059950589 abstract "A marine hyperpycnal plume is a particular kind of turbidity current occurring at a river mouth when the concentration of suspended sediment is so large that the density of the river water is greater than the density of sea water. The plume can then plunge and possibly erode the seafloor to become self-maintained for a particular period of time (hours to weeks). Frequency of hyperpycnal plumes emanating from river discharge can be predicted with knowledge of rating curve characteristics, particularly during flood conditions. Examples of these curves are shown for middle-sized North American rivers. Semi-empirical relationships among average discharge, average sediment concentration, and the discharge during flood are proposed and applied to 150 world rivers. Results show the importance of small and medium sized rivers in their ability to trigger underflow at their mouth. There are at least nine dirty rivers that may trigger underflows during one or more periods of the year. Most other rivers are cleaner and have hyperpycnal plumes only during floods. Large rivers do not generate underflows at their mouth because sediment retention within their expansive coastal flood plains effectively reduces the upper limit of the suspended concentration. Underflow transport may be an important process in marine-delta construction and should be considered in sedimentary basinfill modeling. Proposed equations and nomograms may assist engineers in infrastructure design seaward of a river mouth." @default.
- W2059950589 created "2016-06-24" @default.
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- W2059950589 date "1995-05-01" @default.
- W2059950589 modified "2023-10-11" @default.
- W2059950589 title "Turbidity Currents Generated at River Mouths during Exceptional Discharges to the World Oceans" @default.
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- W2059950589 doi "https://doi.org/10.1086/629747" @default.
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