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- W371191821 abstract "We present measurements which show that the tidal Em s River in Germany is extremely muddy over a 30 km + turbid zone, with fluid m ud o f 1-2 m thickness covering the bed w ith suspended sedim ent concentrations (SSC) o f greater than 50 kg.mT M oreover, we show that these elevated SSC contain large quantities o f organic material which deplete dissolved oxygen (DO) and produce summertime hypoxic zones. Using mathematical modeling, we develop simplified representations o f the estuary physics that reproduce the tidally-averaged circulation, SSC distribution, and oxygen depletion. These models show that SSC and oxygen concentrations are extremely sensitive to factors such as the mean depth, the mixing due to bottom friction (turbulence), and river flow. The observed increase in SSC and decrease in D O over the past 25 years is linked to the progressive deepening o f the tidal Em s from 4-5 m to 7 m between 19851994, which m oved the turbid zone upstream and decreased mixing. A review o f scientific literature and data from the Em s suggests that hum an intervention (dyking,channel modification) combines with more gradual natural changes (sea level rise, climate variation) to continually modify sedim ent transport." @default.
- W371191821 created "2016-06-24" @default.
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- W371191821 date "2011-01-01" @default.
- W371191821 modified "2023-09-27" @default.
- W371191821 title "Circulation, Sediment Concentration and Oxygen Depletion in the Tidal Ems River" @default.
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