Sediment Concentration to Water Discharge Ratio Along the Mississippi (and Missouri) River
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Transcript of Sediment Concentration to Water Discharge Ratio Along the Mississippi (and Missouri) River
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Sediment Concentration to Water Discharge Ratio Along the
Mississippi (and Missouri) RiverCE 397
Statistics of Water Resources
Yao You
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Key Points
•Sediment concentration to water discharge ratio decreases downstream;
•Sediment concentration does not reach the limit of river capacity most of the time.
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Sediment Concentration Against Discharge
Anoka, MN
Flow velocity increases
correlation coefficient: 0.6804
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The Ratio Compared to Discharge
Anoka, MN
Flow velocity increases
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The Ratio Compared to Discharge
St. Louis, MO
Flow velocity increases
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Data Source
• Very few sites have both consistent (suspended) sediment concentration and water discharge data;
• Qualified sites have uneven data points (3-20);
• Data comes from different time periods.
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Treatment of Data
• Few sites: nothing we can do right now...
• Small number of data points: rank sum+t test
• Time period issue: test for trend.
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Results
downstream
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Majority Trend: Upstream ≥ Downstream
downstream
≥ ≥
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Exception: Upstream < Downstream
downstream
<St.
Louis, MO
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Sudden Increase of Sediment Concentration Near St. Louis, MO
St. Louis
Missouri River, major sediment supplier for MS
Mississippi River
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Missouri River
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Missouri River: Results
St. Louis
•Upstream has much larger concentration to discharge ratio;
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Missouri River: Results
St. Louis
•Upstream has much larger concentration to discharge ratio;
•The ratio increases near Sioux, IA and Omaha, NE.
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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.
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Future Work
•Understand the physics of the observed trends;
•Study more rivers to verify those findings.