A REAL TIME SCOUR MEASUREMENT INSTRUMENT

Award Information
Agency:
National Science Foundation
Amount:
$250,000.00
Program:
SBIR
Contract:
N/A
Solitcitation Year:
N/A
Solicitation Number:
N/A
Branch:
N/A
Award Year:
1993
Phase:
Phase II
Agency Tracking Number:
14369
Solicitation Topic Code:
N/A
Small Business Information
North American Geotechnical Co
3658 Lake St, Houston, TX, 77098
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 Dr. E.b. Davies
 Principal Investigator
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
PROPOSED IS A NEW INSTRUMENT BASED ON THE REFRACTION MODE OFSEISMIC SURVEYING TO MEASURE THE DEVELOPMENT OF SCOUR ADJACENT TO A BRIDGE PIER OR ABUTMENT. THE INSTRUMENT USES A REPEATABLE ACOUSTIC SOURCE PLACED NEXTTO THE CONCRETE STRUCTURE AND AN ARRAY OF HYDROPHONES IN A PVC PIPE THAT IS BURIED VERTICALLY IN THE RIVER BED NEXT TO THE PIER. THE ACOUSTIC SOURCE EMITS REPEATED SIGNALS THAT ARE REFRACTED DOWN THE PIER INTO THE SOIL. THE REFRACTED WAVES PROPAGATE TO THE RECEIVER ARRAY ACCORDING TO SHELL'S LAW. SIGNAL ENHANCEMENT THROUGH SUMMING REPEATED EXPERIMENTS IS POSSIBLE BECAUSE THE RATE OF SCOUR IS SLOW COMPARED TO THE TOTAL TRAVEL TIME OF THE REFRACTED ENERGY. SCOUR IS MEASURED AS THE DELAY CAUSED IN THE TRAVEL TIME TO SUCCESSIVELY DEEPER HYDROPHONES AS THE SCOUR ZONE DEEPENS.

* information listed above is at the time of submission.

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