Acoustic Silt Density Measurement

by J. A. Hellema, Rijkswaterstaat, Dordrecht, Neth, Rijkswaterstaat, Dordrecht, Neth,

Document Type: Proceeding Paper

Part of: Dredging and Dredged Material Disposal


Significant savings can be achieved on the costs of operations for the deepening and maintenance of navigation channels and harbor basins in muddy areas provided that computations are based on 'nautical seabed' levels rather than on seabed levels measured through echosounding. The nautical bed consists of the silt layer with specific mass of 1200 kg/per cubic meter. Echosounder measurements indicate a higher level, i. e. , the top of the silt. Extensive model and in situ tests have shown that area where the silt's specific mass is less than 1200 kg/per cubic meter can be qualified as navigable. The results of in-depth research and the development of new measuring techniques allow acoustic measurement of silt layer specific mass.

Subject Headings: Silt | Acoustics | Wave measurement | Benefit cost ratios | Maintenance and operation | Ports and harbors | Sea floor | Layered soils

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