fluvial/pond environments, features, and identification · other types of deposition, including...
TRANSCRIPT
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Fluvial/Pond Environments, Features, and Identification
Copyright © Carmen Krapf 2002
USACE sediment records workshop Aug 2010
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Time Scales of Fluvial Sedimentary Records
Years 0.1 1.0 10 100 1,000 10,000
Individual flood event
Annual floods and seasons
Decadal changes, human alterations, dams and such
Historical post-Euro American settlement, climate
Holocene climate
100,000
Pre-European settlement, Native American
Glacio-fluvial Ran
ge in
var
iabi
lity
[extending the instrumented time period…..]
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Modern geomorphic and watershed settings gives clues to where we expect to find deposition and sedimentary records………
……… “Base level” very important
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Erosion Transfer
Deposition
Upland Upland valley Floodplain valley Large River
Distance downstream/drainage area
Ma
gn
itu
de
Streamflow
Stream power
From Lane (1955), Schumm (1977), Bull (1991), Church (2002), Gregory (2006)
Longitudinal Profiles
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Texture of channel bed deposits and longitudinal profile
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 2, Mountain environments by Jeff Warburton
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Erosion, transport, and sedimentation
From Perry and Taylor, 2007 “Environmental Sedimentology”
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Channel planform changes
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 3, Fluvial environments, by Karen-Hudson Edwards
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Alluvial vs. “Parent Material”
• Alluvial – formed by flowing water and deposited during recent times
• Rivers are called “alluvial” if the modern channel is surrounded (sides and bottom) by sediment that was deposited by modern channel processes (usually assumed to be the Holocene and Anthropocene…)
• Not all rivers are alluvial
• Important to know the difference between alluvial deposits and other types of deposition, including glacio-fluvial, glacio-lacustrine, and outwash
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Alluvial deposits along a river
Modern point bar deposit along the Bad River, WI
Historical overbank vertical accretion deposits along the Bad River, WI
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Parent materials along a river
Glacio-fluvial sand and shoreline deposits along the Bad River, WI (G
Glacio-lacustrine clay along the Bad River, WI (Marquette re-advance)
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From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 2, Mountain environments by Jeff Warburton
Where do we expect sedimentation or erosion?
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Geomorphic process and related deposits
From Perry and Taylor, 2007, Environmental Sedimentology
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Dominance of sediment transfer processes
From Lane (1955), Schumm (1977), Bull (1991), Church (2002), Gregory (2006)
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Gravity flows vs. fluvial flows
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 2, Mountain environments by Jeff Warburton
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Copyright © Harriet Orr 2002
Colluvium, slide, rockfall —a loose jumbled collection of unsorted rock and soil that collects at the foot of a steep slope
Colluvial boulder berm – poorly sorted, angular, coarse fragments
Copyright © Evan Hart 2002
Old colluvial terrace exposed by stream erosion, Great Smoky Mountains, TN.
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Debris (Sediment Gravity) Flows • Moving loose mass of mud,
sand, rock, soil, water, and air
• Moves under influence of gravity
• Poorly sorted mix of particle sizes that move independently within the flow
• 50% sand sized particles and larger
• Travel at <1 ft/yr to 100 mi/hr
http://geology.com/articles/debris-flow/
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Debris (Sediment Gravity) Flows
Bridge, 2003
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Mudflows
• Less coarse and more cohesive than a debris flow
• Large boulders are transported by matrix strength
• Lahar is a type of mudflow or debris flow that originates from volcano slopes
• Mudflows grade into hyperconcentrated streamflow where boulders are no longer able to be carried on top by matrix strength
Photo by AlexeyKZ http://www.panoramio.com/photo/8882900; Mud Volcano, Sychliar, Azerbaijan
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Water flows and sediment
• Suspended vs. moved along the bed
• Vertical vs. lateral accretion • Channel vs. overbank For particles in suspension: Advection: passive transport of particles by the moving fluid Diffusion: molecular agitation and small scale turbulent motions that move the particle randomly with respect to the overall motion of the fluid Settling: vertical falling of particles through fluid under the action of gravity
From Perry and Taylor, 2007, Environmental Sedimentology
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Hudson-Edwards, 2007
(Brown, 1997)
Floodplain environments and sedimentary features
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Typical “fining upwards” floodplain sequence with gravel/cobble at base
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 3, Fluvial environments by Karen-Hudson Edwards
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Copyright © Richard Kesel 2002
“traditional hydraulics”
“New age energy vortex” in Oak Creek canyon, Sedona, AZ
Channel bed deposits – imbricated boulders
Flow direction
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Repeating channel geomorphic units
Fryirs and Brierley, 2013 Geomorphic analysis of fluvial systems
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Lower stage plane beds – bedload sheets
Bridge, 2003
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Water flows, bedforms, and sedimentary structures
From Perry and Taylor, 2007, Environmental Sedimentology
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Channel Bedforms and Structures
• Features of transverse bedforms – dunes and ripples
Hudson-Edwards, 2007
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Channel Bedforms and Structures • Features of dunes and ripples
Simons et al., 1965
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Dunes – height and length a function of water depth
Bridge, 2003
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Chutes and pools, anti-dunes, and plane beds
Bridge, 2003
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Turbulent flow over ripples and dunes
Bridge, 2003
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Cross stratification example
Harms and Fahnestock, 1965
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Point bar formation – lateral accretion
• Secondary flow around bends in meandering channels
• Lateral accretion as channel migrates
• Stacked sequences of gravel, sand, and silt
• Sequences angled toward direction of lateral progression
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Sand stratification in a bar
Harms and Fahnestock, 1965
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Point bar deposits in sandy channels
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Point bar deposits in cores
photo by J. Pyatskowit
Lateral accretion point bar deposit, Wolf River, WI
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Typical flood sequences
Bridge, 2003
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Interpretation of paleo bankfull channels
Bridge, 2003
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Copyright © Pauline Couper 2002
Buried channel deposit in cohesive overbank vertical accretion
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Flood plains – zooming in
Bridge, 2003
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Floodplain building
Powder River, MT (Moody et al. 1999)
• Mainly vertical accretion
• Not always constant deposition, especially in active channel area, erosion, ice
• Spatial extent variable, especially in forested floodplains
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Kickapoo Floodplain Scour and Deposition Produced by July 1-2, 1978 Flood (near Steuben, WI) 16,500 cfs, 100-yr
2 July 1978, 1 mi south of Readstown
Flood deposits
Jim Knox photos
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Section 25 T3N R2W, Little Platte River – Impact of 1 June 2000 Flood Date of photos: 12 June 2000
Jim Knox photos
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post-1820 agricultural sedimentation
pre-agricultural surface soil
boulders transported by August 2, 1972 flood
Late Holocene channel sediment
Historical Change in Flood Power, L. Platte River Tributary, SW Wisconsin
Jim Knox photos
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Copyright © Philip Owens 2002
Fine sediment (clay and silt deposited on the floodplain of the River Teme (tributary to the River Severn). These deposits were about 1 cm thick and located about 100 m from the channel. Tube is used to measure sedimentation.
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Copyright © Philip Owens 2002
Thick sandy overbank deposits near channel bank, River Ousenear, York. Deposits were about 20 cm thick.
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Copyright © Johannes Steiger 2002
Woody debris and vegetation become part of the sediment record in overbank areas. Preservation is dependent on the oxidation state of the deposit. If above the water table and in sandy deposits, the woody material may decompose in decades.
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Levees and crevasse splays
http://www.scielo.br/img/revistas/rbcs/v37n5/01f01.jpg
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Levees and crevasse splays
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Pre-settlement (1860) surface 5.6 ft
Levee breaks
Holmen dam and millpond
Erosion/scour from dam failure
Halfway Creek crevasse splay 1938
Levees and crevasse splays
• Thick sandy deposits over fine-grained vertical accretion deposits
• Planar beds but may also have cross strata from ripples/dunes across the surface
• Adjacent to active channel
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Deltas and Alluvial Fans
Morphological classification of deltas based on the influence of river, tidal, and wave activity
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 7, Delta environments by Peter French
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Three types of deltas near Ashland, WI, Lake Superior
Bad River
Fish Creek
Wave-dominated
Fluvial-dominated
Seiche-dominated
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Delta anatomy
(Hakanson and Jansson, 2002)
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Delta anatomy
From Perry and Taylor, 2007, Environmental Sedimentology, Chapter 7, Delta environments by Peter French
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Copyright © Matthias Jakob 2002
Sediment-rich delta
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Deltaic environments of the Mississippi River
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Lacustrine sediment (Cohen, 2003, p. 187)
Hi water content
Mix of mineral and organic
particles
Varves represent
seasonality of particle
sources – repeated
sequencing
Laminae = < 1 cm
Bed = < 1 cm
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Lacustrine gyttja – eutrophic/mesotrophic lake
Lac Courte Oreilles, Hayward, WI Paul Garrison (WDNR) photos
High organic content
High water content
When exposed to exposed
to air can shrink
considerably
Term gyttja confusing –
typically used for organic-
rich silts and clays
Hakanson and Jansson,
2002 good reference
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Copyright © Martin Doyle 2002
Impoundment Deposits
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Erosion, transport, and sedimentation
(Hakanson and Jansson, 2002)
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Impounded sediment, Neopit Millpond, Menominee Reservation, WI
Organic-rich silt/clay with very high water content over pre-dam peat (photo by Barb Lensch, NRCS) ~25% organic carbon
Impounded sediment Predam surface
Impounded sediment Peat/histosol
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Balsam Row Impoundment, Wolf River, WI
Fitzpatrick, 2005
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Riparian wetland
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Core 16
Core 14
Core 13
Fort McCoy Stillwell Cr at 16th Ct cores 2008
Riparian wetland and wetland channel
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Beaver dams – low sediment supply North Shore Lake Superior, MN
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Channel inlet Muddy delta
Beaver pond deposits – fine-grained, low sedimentation rate, varying densities from wetting and drying
Grand Portage Creek, MN North Shore Lake Superior
Soil probe
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Beaver dams– high sediment supply Cranberry River, Wisconsin
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Beaver dams – high sediment supply Large dumps of sand – vertical accretion – over wetland organic soils Clumps of brushy material
Photo from Dennis Pratt Bark River, WI South Shore Lake Superior
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Copyright © Ron Dorn 2002
Alluvial fans
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Typical Valley Types in the Upper Great Lakes Region
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Tunnel valleys
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Finger Lakes area, NY, source NASA
Boardman River valley influenced by glacial-fluvial and glacio-lacustrine activity
Tunnel Valley: Large, Long, U-shaped valley originally cut under the glacial ice near the margin of continental ice sheets. Form by subglacial erosion from large volumes of meltwater
Stop 1
Stop 2
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Terrace development
Charlton, 2008
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Terrace development
Powder River examples (Leopold and Miller, 1954)
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Leopold and Miller 1954 – Terraces and valley fills of eastern Wyoming
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Clear Creek cross section
Leopold’s basis for three terraces in western rivers (Leopold and Miller, 1954)
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Criteria for correlating terraces
Leopold’s basis for three terraces in western rivers (Leopold and Miller, 1954)
• Three terraces – Kaycee, Moorcroft, Lightning
• Terrace morphology
• Continuity
• Height
• Physiographic relation to other terraces
• Stratigraphy of underlying fills
• Relation to buried soils, unconformities, fossil zones, and other markers (maybe volcanic ash in other areas)
• May be underlain by different units, but similar surface age, soil development
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Other interpretive features
• Continuity of stream process (all cutting or filling) – longitudinal extent, cause?
• Paired heights on either side of valley – less lateral migration, quick downcutting
• Progressive downcutting – no pairing, irregular heights more common
• Slope wash profiles give indication of minimum stream elevation
Leopold and Miller, 1954
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Sand Gravel Soil development
EXPLANATION
Water level
Upland
Terrace
North Fish Creek Upper main stem Valley cross section
Terrace
Well-developed soil
Poorly-developed soil
Terrace Terrace
Terrace Modern
channel
Pre-1946
channel
DISTANCE ACROSS VALLEY (METERS)
Location
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Fluvial terrace look a-likes
Grand Portage Creek, MN
Slumps
Glacial lake shorelines
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Terrace deposits
Glacio-lacustrine diamicton Grand Portage Creek, MN
Glacial Lake Algoma beach deposits over Glacial Lake Nippissing lacustrine deposits Pigeon River, MN
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Accelerated floodplain deposition • Reconstruct long-term sediment loadings based on overbank
sedimentation rates
• Combines channel position changes, radiometric dating, identification of buried soils
photo by Bob Hansis
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Mill Creek, 10 mi^2, Platte River Watershed
Sand Creek, Kickapoo River Watershed (Happ, 1940)
Kickapoo River (Happ, 1940)
Halfway Creek, 2005
Little Platte River, 150 mi^2
x c. 3100 yr BP
c. A.D. 1830
Jim Knox photos
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Knox, 2001
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Tracking paleochannels – Driftless Area, SW WI
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Humans as geomorphic agents
Copyright © Robert Pavlowsky 2002
Mine tailings, 1890-1930, Blue River, Wisconsin
Fur Trade Village and fields – Grand Portage National Monument, MN 1700s to 1920s
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Copyright © Allan James 2002
Hydraulic mining sediment
• High quartz content • Spheroidal shaped pebbles • Sand lenses • No cementation • Some imbrication • Some cross bedding • Thick deposition
Copyright © Allan James 2002
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t o p b a n k d i r e c t i o n o f f l o w
aggraded material
h
h
Stage I. Sinuous, Premodified h<h c
h h
direction of bank or bed movement
critical bank height h c = =
h
slumped material
slumped material
aggraded material
oversteepened reach
precursor knickpoint
plunge pool
secondary knickpoint
primary knickpoint
aggraded material
terrace h bankfull
bank
floodplain terrace
terrace
Stage V. Aggradation and Widening h>h c
Stage III. Degradation h<h c
Stage VI Stage V
Stage IV Stage III
Stages I, II
Stage II. Constructed h<h c
Stage IV. Degradation and Widening h>h c
Stage VI. Quasi Equilibrium h<h c
aggradation zone
Channelization, Channel Evolution, and Floodplain Deposition
t o p b a n k d i r e c t i o n o f f l o w
aggraded material
h
h
Stage I. Sinuous, Premodified h<h c
h h
direction of bank or bed movement
critical bank height h c = =
h
slumped material
slumped material
aggraded material
oversteepened reach
precursor knickpoint
plunge pool
secondary knickpoint
primary knickpoint
aggraded material
terrace h bankfull
bank
floodplain terrace
terrace
Stage V. Aggradation and Widening h>h c
Stage III. Degradation h<h c
Stage VI Stage V
Stage IV Stage III
Stages I, II
Stage II. Constructed h<h c
Stage IV. Degradation and Widening h>h c
Stage VI. Quasi Equilibrium h<h c
aggradation zone
t o p b a n k d i r e c t i o n o f f l o w
aggraded material
h
h
Stage I. Sinuous, Premodified h<h c
h h
direction of bank or bed movement
critical bank height h c = =
h
slumped material
slumped material
aggraded material
oversteepened reach
precursor knickpoint
plunge pool
secondary knickpoint
primary knickpoint
aggraded material
terrace h bankfull
bank
floodplain terrace
terrace
Stage V. Aggradation and Widening h>h c
Stage III. Degradation h<h c
Stage VI Stage V
Stage IV Stage III
Stages I, II
Stage II. Constructed h<h c
Stage IV. Degradation and Widening h>h c
Stage VI. Quasi Equilibrium h<h c
aggradation zone
Slide: Andrew Simon
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Log Drives
http://books.google.com/books?id=rBnFc03CX6MC&pg=PA89&lpg=PA89&dq=boardman+river+historical+log+drives&source=bl&ots=Xih7bRmbPi&sig=6bNj5xIJzHmn0QTKpAkQv0D2ASM&hl=en&ei=yM1cTMVqgoHyBtObnNQC&sa=X&oi=book_result&ct=result&resnum=6&ved=0CCgQ6AEwBQ#v=onepage&q&f=false
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http://web.engr.oregonstate.edu/~arrast/Gradprojects_09/MIller%20splash%20dam%20ponding%20area%20Luckiamute%20River.pdf
Splash dams – a common occurrence on streams used
for log drives
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Boardman River, Keystone Impoundment, Stop 1
Questions?