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Sediment Concentration to Water Discharge Ratio Along the Mississippi (and Missouri) River CE 397 Statistics of Water Resources Yao You.

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Presentation on theme: "Sediment Concentration to Water Discharge Ratio Along the Mississippi (and Missouri) River CE 397 Statistics of Water Resources Yao You."— Presentation transcript:

1 Sediment Concentration to Water Discharge Ratio Along the Mississippi (and Missouri) River CE 397 Statistics of Water Resources Yao You

2 Key Points Sediment concentration to water discharge ratio decreases downstream; Sediment concentration does not reach the limit of river capacity most of the time.

3 Sediment Concentration Against Discharge Anoka, MN Flow velocity increases correlation coefficient:

4 The Ratio Compared to Discharge Anoka, MN Flow velocity increases

5 The Ratio Compared to Discharge St. Louis, MO Flow velocity increases

6 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.

7 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.

8 Results downstream

9 Majority Trend: Upstream ≥ Downstream downstream ≥≥

10 Exception: Upstream < Downstream downstream < St. Louis, MO

11 Sudden Increase of Sediment Concentration Near St. Louis, MO St. Louis Missouri River, major sediment supplier for MS Mississippi River

12 Missouri River

13 Missouri River: Results St. Louis Upstream has much larger concentration to discharge ratio;

14 Missouri River: Results St. Louis Upstream has much larger concentration to discharge ratio; The ratio increases near Sioux, IA and Omaha, NE.

15 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.

16 Future Work Understand the physics of the observed trends; Study more rivers to verify those findings.


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