Overview of fluvial and geotechnical processes for TMDL assessment

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1 Overview of fluvial and geotechnical processes for TMDL assessment Christian F Lenhart, Assistant Prof, MSU Research Assoc., U of M Biosystems Engineering

2 Fluvial processes in a glaciated landscape Martin County, MN Rocky Mountains (Rosgen)

3 Hillslope processes Surface erosion Land-use history & changes to load Rates have decreased, but RUSLE and other models- well studied

4 Sediment delivery Sed. delivery poorly understood Small % of eroded sediment is carried all the way to river mouth S dr = 63 S m 0.40 Rosgen (WARSSS pg. 2 3)

5 Sed delivery by slope Sediment delivery by slope Slope % 10.0% 20.0% 30.0% 40.0% 50.0% 60.0% 70.0% 80.0% 90.0% -0.5 Sediment delivery ratio

6 Case studies Driftless area: Coon Creek, WI 5% of sediment eroded since European settlement carried out to Mississippi River (Trimble, Science article). Rush Creek, MN 4-8 feet on floodplain Elm Creek, MN Sediment measured at gage 8-13% of estimated annual soil erosion (Lenhart 2008)

7 Legacy sediment Where is the excess sediment from the past 150 years stored? Stream valleys Wetlands and lakes Stream reaches with low velocity and slope; Overwidened reaches (ditches) low unit stream power ( ω )

8 Depositional areas Ditches have become depositional areas Increased width reduces shear force, inducing deposition (Landwher, 200x)

9 Lakes and Wetlands

10 Hillslope processes: Mass soil movement Gravity-driven movements: Falls, slides, flows, soil creep Bluffs are a major source of sediment by mass-wasting in Minnesota River Basin

11 Geomorphic categories Valley wall = Bluff Streambank = Active channel boundary Ravines = steep tributaries flowing over the valley wall to larger rivers

12 Ravines

13 Ravines in Minnesota Basin

14 Hillslope Erosion: Gullies Sheet erosion Rill erosion Gullies

15 Gullies within ravines gully inset within larger ravine CS2 Riffle Elevation (ft) Ravine Gully Width from River Left to Right (ft)

16 Channel Processes Patterns of erosion and deposition

17 Equilibrium Theory and Streams Idealized stream in equilibrium: Sediment supply in balance with transport Deposition on point bars in balance with erosion on outer bend Are Minnesota streams in equilibrium?

18 Physical forces in streams Force balance described by equation of motion For channel with flowing water: d(mv)/dt = F gravity + F pressure F shear expanded out: d(mv)/dt =(ρ*g* A* x* SIN α S0) + (Fp1- Fp2) (τb * wp* x) [where, ρ = density of water, g= gravitational constant, A= area, x = change in distance over control volume, S0= channel bottom slope, Fp1 = force at point x, Fp2 = force at point x + x.]

19 Force balance: streams exist in a dynamic equilibrium Lane s = predicts channel adjustment Channel dimensions shaped by frequently occurring floods bankfull flows

20 Sediment Transport in channels Bedload Suspended load Wash load

21 Entrainment equations Shield s Equation

22 Suspended Sediment Often estimated by TSS (total suspended solids) - organic matter and sediment Turbidity is regulated pollutant

23 Particle size of SS At most flows levels >70% is silt / clay At high flows fines are <30% frequency Particle size of suspended sediment on the Minnesota River at Jordan, MN betweeen 1981 and to 20 % silt and clay % of particles finer than sand (0.063mm)

24 Bedload sediment Moves by bouncing, rolling In MN River basin, comprised mostly of sand Smaller component of total load

25 40 Threshold sediment size vs. Median Particle Size in Elm Creek bed sediment easily mobilized at high flows Threshold sediment size (mm) Mobilization Deposition Threshold = D Median Bed Particle size - D 50 (mm)

26 Channel-forming flows Dave Rosgen

27 Hydrologic-watershed processes More generally, Lane s sediment balance q s D 50 qs q s = sediment discharge D 50 = average diameter of bed particle size q = stream flow S = slope

28 Changes to equilibrium Changes to watershed hydrology and streamflow cause channel adjustment in Minnesota Recent drainage increases Private tile drainage expansion < 30 years Precipitation high in 1990s Result: increased low and mean flows (Zhang and Schilling, 2007)

29 Simon and Schumm Channel Evolution Model Most southern Minnesota streams are in stages 3-5, especially 4 and 5

30 Sources of sediment in rivers Streambanks Bluffs Ravines/gullies Legacy sediment

31 Channel erosion: streambank Photo of Elm Creek by C. Lenhart

32 Sediment sources: streambanks Soil Traits of MRB streambanks Allluvium Minnesota River streambanks (high sand%) Gullies within ravines Young glacial till Des Moines Lobe Till (fine silts and clays) Old glacial till Superior lobe- highly compressed, stable

33 Role of vegetation Hydraulic erosion Hydrologic role less mass wasting by lowering soil moisture Grazing effects on roots Bank Erosion Hazard Index quantifies root influence

34 Headwaters prairie Grass vs. trees Riparian forests on larger rivers

35 Sediment sources: Bluffs (valley wall erosion) Dramatic examples of mass-wasting High delivery ratio Stability of denser tills?

36 Sediment sources: Ravines/gullies Hard to capture events from gullies Active gully only a small % of ravines Sediment delivery is lower than streambanks and bluffs dump out onto MN River floodplain

37 Sediment sources: Legacy sediment Mean depth of fine sediment in Elm Creek 1.1 feet (n = 360) Little studied recently Historically by SCS after Dust Bowl years

38 Current Research Ravine, Bluff, Streambank Erosion study in Minnesota River Basin Bioproducts & Biosystems Engineering, U of M Minnesota Pollution Control Agency Purpose: to quantify sediment loads from R, B and S sources; contribution to turbidity problem

39 Methods Ravines: runoff, TSS monitoring at gully outlets; geomorphic assessment Stream classification, CEM assessment Physical property measurement: critical shear stress, particle size

40 Study sites

41 Bank stability and toe erosion model (BSTM) Critical shear stress Cohesive strength

42 Data Field-measured rates of bank erosion Modeled erosion and transport using CONCEPTS Sediment loading from gullies/ravines Historic rates of channel migration estimated from photos

43 Preliminary findings Bluffs major sources of sediment; some hard tills are stable (Gupta, Thoma, Mulla) Ravines (Mulla GIS work)? Gullies Streambanks:

44 Conclusions Examine processes from watershed headwaters to river mouth using WARSSS framework + extra tools Some key processes are different in flat glaciated landscapes versus mountains Total sediment erosion from watershed far exceeds amount carried out

45 Management Issues Ag erosion has decreased since mid 1900s Channel erosion is increasingly a large % of suspended sediment in rivers Legacy sediment largely ignored Need channel management as well as watershed management

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