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Ventura River: Fluvial Geomorphology E.A Keller UCSB

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Page 1: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Ventura River: Fluvial GeomorphologyE.A Keller UCSB

Page 2: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Transverse Ranges

Page 3: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 4: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

The Ventura River is an often bed-rock, braided river, that flows across many active structures

Page 5: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 6: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 7: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 8: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 9: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Ventura River Terraces are Folded Over Anticline

Page 10: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 11: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Oak ViewFaults

Page 12: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

FaultedTerraces near Oak View

Page 13: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Geologic History:Ventura River terraces show river has migrated west for thousands of years.Most of floodplain is to west

Page 14: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

100,000yrs60,000yrs

40,000yrs 30,000yrsAcross river: 20,000yrs

Page 15: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 16: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

100,000 yrs

40,000yrs

Ventura River

60,000 yrs

Page 17: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Why is the Ventura R. Migrating West?

• Active uplift ,mostly to the east on faults and folding of the rocks is responsible.

• The bluff top at Monte Vista is several 10s of thousands of years old.

• The Devil's Gulch Fault (discovered by Keller in the 1970s)is a south side up fault pushing the bluffs up when displacement occurs.

Page 18: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Bedrock pool nearMeinersOak

Page 19: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Major Floods Ventura River

• Since 1933 the 6 largest floods have occurred since1969.The largest was in 1978,followed by 1969.Average return period was about 37 and 74 years respectively.

• The floods in 1992 and 1995 were larger than 2005,but not by much

• The flood of 2005 was a moderate event with average return period of about 15 years

Page 20: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Ventura River in 1929

Page 21: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

1938 flood damage

Page 22: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

1978 following largest flood of record:note river is mostly to the west

Page 23: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

After 2005 flood :note channel against Monte Vista Bluffs(photo 2005)

Page 24: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Loss of trees following 2005 flood (2006 photo)

Page 25: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

February 1992 Delta Flood

Page 26: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Delta Floods 1992

Page 27: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 28: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Delta Flood1992

Page 29: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 30: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 31: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Second Mouth, Ventura River

Page 32: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 33: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 34: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 35: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 36: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Flood ControlNear Oak View

Page 37: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Landslides on Monte Vista Bluff 2006

Page 38: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Natural Channel form: braided,close to bedrock

Page 39: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Matilija Dam

Page 40: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Matilija Lake

Page 41: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Upstream of Dam

Page 42: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

Downstreamof dam

Page 43: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 44: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active
Page 45: Ventura River: Fluvial Geomorphology E.A Keller UCSBGeomorphology E.A Keller UCSB Transverse Ranges The Ventura River is an often bed-rock, braided river, that flows across many active

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