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Measurement of scour-depth near bridge piers

Water-Resources Investigations Report 85-4106

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Abstract

River-bed scour is a major source of damage to bridge piers and bridge abutments. When scour depth exceeds design limits, the supporting material around the footings is washed away and the structure becomes unstable. Equations for predicting scour-depth show a significant lack of agreement so portable equipment for measuring scour is needed. An instrumented, unmanned boat was designed. It (a) can be launched and controlled from a bridge and (b) can be manuevered in flood flows that reach velocities of 15 ft/s. Calculations indicate the battery-powered propulsion system alone will weigh about 300 lb and that the craft must be about 15-ft long. Because a free-running craft will be undesirably heavy and large, other methods of obtaining scour data are proposed. A tethered craft fitted with a controllable rudder and some methods of measuring scout at a point are presented for future study and development. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Measurement of scour-depth near bridge piers
Series title:
Water-Resources Investigations Report
Series number:
85-4106
Edition:
-
Year Published:
1986
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 33 p. :ill., maps ;28 cm.