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1、Sediment Concentration to Water Discharge Ratio Along the Mississippi(and Missouri)River,CE 397Statistics of Water ResourcesYao You,Key Points,Sediment concentration to water discharge ratio decreases downstream;Sediment concentration does not reach the limit of river capacity most of the time.,Sedi
2、ment Concentration Against Discharge,Anoka,MN,Flow velocity increases,correlation coefficient:0.6804,The Ratio Compared to Discharge,Anoka,MN,Flow velocity increases,The Ratio Compared to Discharge,St.Louis,MO,Flow velocity increases,Data Source,Very few sites have both consistent(suspended)sediment
3、 concentration and water discharge data;Qualified sites have uneven data points(3-20);Data comes from different time periods.,Treatment of Data,Few sites:nothing we can do right now.Small number of data points:rank sum+t testTime period issue:test for trend.,Results,downstream,Majority Trend:Upstrea
4、m Downstream,downstream,Exception:Upstream Downstream,downstream,St.Louis,MO,Sudden Increase of Sediment Concentration Near St.Louis,MO,St.Louis,Missouri River,major sediment supplier for MS,Mississippi River,Missouri River,Missouri River:Results,St.Louis,Upstream has much larger concentration to di
5、scharge ratio;,Missouri River:Results,St.Louis,Upstream has much larger concentration to discharge ratio;The ratio increases near Sioux,IA and Omaha,NE.,Conclusions,Sediment concentration to discharge ratio decreases downstream;Missouri River contributes a significant amount of sediment into the Mississippi River upstream of St.Louis,MO;Rivers are not at their full transport capacity most of the time.,Future Work,Understand the physics of the observed trends;Study more rivers to verify those findings.,
