Asce Ewrg Presentation

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MarjorieWolfe

Tualatin river tributary stream erosion study in partnership with Andrew Simon of USDA.

Tecnologia

By Marjorie Wolfe, PE, CFM Senior Engineer Clean Water Services Tualatin River Tributaries Cohesive Stream Channel Erodibility Study

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Clean Water Services Facts ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],A direct Connection

[object Object],[object Object],[object Object],[object Object],Watershed based permit

The Clean Water Course Swale Water Quality Treatment Stream Restoration Projects Watersheds 2000 Healthy Streams Plan Watershed Based Permit Stream Erodibility Study Vegetated Corridor Standards

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Preparing for the Next Bend…

Why this study? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],The Goal of this Work is…

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Outline

[object Object],[object Object],[object Object],Stream Response

What does flow have to do with it? (USEPA - after Wolman and Miller 1960)

[object Object],[object Object],[object Object],[object Object],[object Object],Study Objectives

[object Object],[object Object],[object Object],Field Data Gathering

[object Object],[object Object],[object Object],[object Object],Determining Erodibility

Obtained from jet-test device  = k (  o -  c )  = erosion rate (m/s) k = erodibility coefficient (m 3 /N-s)  o = boundary shear stress (Pa)  c = critical shear stress (Pa) (  o -  c ) = excess shear stress Critical shear stress is the stress required to initiate erosion. The Equation

Jest Test Device Jet Nozzle Jet Nozzle As scour hole depth increases, shear stress decreases

From Relation between Shear Stress and Erosion We Can Calculate  c and  Shear Stress, Pa Erosion Rate, cm 3 /sec  c

[object Object],[object Object],[object Object],Data Analysis

Bank-Toe Erosion After First Flow Event Bank Stability and Toe Erosion Model (BSTEM)

[object Object],[object Object],[object Object],[object Object],Geomorphic Assessment Map

Cohesive Strength Meter (CSM ) The CSM consists of a water-filled chamber 30 mm in diameter that is pushed into the sediment. The jet of water comes from a downward directed nozzle in the chamber. The velocity of the jet is increased systematically through each experiment. Bed erosion is inferred from the drop in the transmission of infrared light across the chamber caused by the suspension of sediment. Lighter, Faster, not as robust, indirect measurement

Mapping Critical Shear Stress: Yalobusha River Basin, MS

[object Object],[object Object],[object Object],[object Object],Vegetated Corridor Effects

Cohesion due to roots is a function of the tensile strength of the roots and their distribution (root-area ratio)

[object Object],[object Object],[object Object],[object Object],Preliminary Findings

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Questions?

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Asce Ewrg Presentation

1. By Marjorie Wolfe, PE, CFM Senior Engineer Clean Water Services Tualatin River Tributaries Cohesive Stream Channel Erodibility Study

3. Tualatin River Watershed

7. The Clean Water Course Swale Water Quality Treatment Stream Restoration Projects Watersheds 2000 Healthy Streams Plan Watershed Based Permit Stream Erodibility Study Vegetated Corridor Standards

10.

11.

12. Cedar Mill Creek Watershed, 1984

13. Cedar Mill Creek Watershed, 1990

14. Cedar Mill Creek Watershed, 1994

15. Cedar Mill Creek Watershed, 1997

16. Cedar Mill Creek Watershed, 2002

17.

18.

19.

20. What is different about cohesives?

21. What does flow have to do with it? (USEPA - after Wolman and Miller 1960)

22.

23.

24.

25.

26. Obtained from jet-test device  = k (  o -  c )  = erosion rate (m/s) k = erodibility coefficient (m 3 /N-s)  o = boundary shear stress (Pa)  c = critical shear stress (Pa) (  o -  c ) = excess shear stress Critical shear stress is the stress required to initiate erosion. The Equation

27. Jest Test Device Jet Nozzle Jet Nozzle As scour hole depth increases, shear stress decreases

28. From Relation between Shear Stress and Erosion We Can Calculate  c and  Shear Stress, Pa Erosion Rate, cm 3 /sec  c

29. Determining shear strength

30.

31. Bank-Toe Erosion After First Flow Event Bank Stability and Toe Erosion Model (BSTEM)

32. Check for stability FS>1

33. Simulate Next Flow and Check Stability

34.

35.

36. Cohesive Strength Meter (CSM ) The CSM consists of a water-filled chamber 30 mm in diameter that is pushed into the sediment. The jet of water comes from a downward directed nozzle in the chamber. The velocity of the jet is increased systematically through each experiment. Bed erosion is inferred from the drop in the transmission of infrared light across the chamber caused by the suspension of sediment. Lighter, Faster, not as robust, indirect measurement

37. Mapping Critical Shear Stress: Yalobusha River Basin, MS

38.

39. Cohesion due to roots is a function of the tensile strength of the roots and their distribution (root-area ratio)

40.

41. Same creek different corridor

42.

43.

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