ventura river: fluvial geomorphology e.a keller ucsbgeomorphology e.a keller ucsb transverse ranges...
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Ventura River: Fluvial GeomorphologyE.A Keller UCSB
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Transverse Ranges
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The Ventura River is an often bed-rock, braided river, that flows across many active structures
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Ventura River Terraces are Folded Over Anticline
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Oak ViewFaults
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FaultedTerraces near Oak View
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Geologic History:Ventura River terraces show river has migrated west for thousands of years.Most of floodplain is to west
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100,000yrs60,000yrs
40,000yrs 30,000yrsAcross river: 20,000yrs
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100,000 yrs
40,000yrs
Ventura River
60,000 yrs
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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.
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Bedrock pool nearMeinersOak
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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
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Ventura River in 1929
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1938 flood damage
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1978 following largest flood of record:note river is mostly to the west
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After 2005 flood :note channel against Monte Vista Bluffs(photo 2005)
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Loss of trees following 2005 flood (2006 photo)
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February 1992 Delta Flood
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Delta Floods 1992
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Delta Flood1992
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Second Mouth, Ventura River
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Flood ControlNear Oak View
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Landslides on Monte Vista Bluff 2006
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Natural Channel form: braided,close to bedrock
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Matilija Dam
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Matilija Lake
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Upstream of Dam
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Downstreamof dam
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The Objective:Sustainable Rivers