Michael Christy October 13, 2010
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Transcript of Michael Christy October 13, 2010
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Michael Christy
October 13, 2010
2010 HSRP Public MeetingColumbia River Mapping Efforts
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Broughton’s Survey of the Columbia River in 1792
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Historic NOAA Surveys
Over 150 years of mapping the Columbia River.
1854
1888
1998
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Survey Dates on the Columbia River
Last surveyed in over 100 years in places.
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Designated as a Critical Survey Area
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USACE Role – Channel Maintenance
• USACE surveys the channel regularly for maintenance and occasional crossline surveys not intended to detect obstructions
• USACE provides channel surveys in a table format which NOAA posts on nautical charts
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NOAA’s Survey of the Columbia
RM 30.4
RM 110
RM 17
6 Sheets100 nautical milesFull bottom coverage to 4m (13ft)Set line spacing to 2m (6.5ft)
Columbia River
Willamette River
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Unique Charting Datum
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Columbia River Datum
• Defined by R.E. Hickson from the Portland District U.S. Army Corps of Engineers in 1912.
• Later refined and related to NGVD29.
• USACE Portland District published Columbia River Datum Elevations CL-03-116 which defined CRD and Ordinary High Water relative to River Mile in 1978.
• Current effort to define relative to NAVD88.
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Columbia River Datum – Discrete Tidal Zoning
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Columbia River Datum – Real-Time GPS Water Levels
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Columbia River Datum – Real-Time GPS Water Levels
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Columbia River Datum – Zoning vs. GPS Water Levels
1.3ft
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Columbia River Datum – Zoning vs. GPS Water Levels
Zoned tides GPS water levels
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Columbia River Datum – Zoning vs. GPS Water Levels
Reduction of uncertainty achieved through theuse of GPS water levels.
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Survey of the Lower Columbia and Willamette
RM 30.4
RM 110
RM 17What did we find?
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Survey of the Lower Columbia and Willamette
65 Uncharted Dangers to Navigation
1400+ Significant Features400+ Disproved Features
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Survey of the Lower Columbia and Willamette
0.5 miles
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Survey of the Lower Columbia and Willamette
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Charting Survey for NOAA on the Lower Columbia
Insert sample DtoNs and hazards – see Kathleen
Ross Island Bridge
Sunken Barge
Submerged Pipes
Submerged Sail Boat
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Charting Survey for NOAA on the Lower Columbia
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Columbia River Mapping – Interagency Use
“Map Once…Use Many Times”
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Columbia River Treaty – Lower Columbia River
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Columbia River Treaty – Lower Columbia River
2010 – LCREP singlebeam2009 – USACE singlebeam2009 – NOAA multibeam1988-2007 – Various USACE1851-2003 – Historic NOAA (1935 earliest use)
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CRD/MLLW to NAVD88
MLLW CRD
Harrington Point
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Columbia River Treaty – Lower Columbia River
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Columbia River Treaty – Lower Columbia River
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Columbia River Treaty – Lower Columbia River
2003 USACE 2009
USACE
2003 USACE
2009 LCREP
2003 USACE
2009 USACE
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Columbia River Treaty – Lower Columbia River
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Columbia River Treaty - Upper Columbia River Basin
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Columbia River Treaty - Upper Columbia River Basin
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Columbia River Mapping – Multiple Use
Possible Strikes
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Columbia River Mapping – Multiple Use
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Columbia River Mapping – Multiple Use
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Columbia River Mapping
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Columbia River Mapping – Multiple Use