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Seabed Stability Modules

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CALCULATOR MODULE : Ocean Wave And Current Seabed Stability   ±

Calculate subsea critical seabed velocity for seabed stability and sediment movement from the critical shields number.

The Shields parameter is used to calculate the onset of seabed instability due to sediment movement. For subsea waves and currents the critical Shields parameter is approximately 0.04. For laminar flow the critical Shields parameter is approximately 0.03.

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CALCULATOR MODULE : DNVGL RP F109 Shields Number   ±

Calculate DNVGL RP-F109 Shields number and critical velocity.

Shields number is the ratio of shear force to weight force and is used to estimate the onset of seabed movement for non cohesive soils. The critical velocity corresponds to to the onset of seabed movement.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Initial Seabed Penetration   ±

Calculate DNVGL RP-F109 initial pipeline penetration due to weight on sand and clay soils.

Penetration should be calculated for the maximum pipe weight, normally the water filled weight during pre commissioning. Pipe penetration or embedment is assumed to be zero on rocky seabeds.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Wave Seabed Velocity   ±

Calculate DNVGL RP-F109 wave seabed velocity from the JONSWAP surface spectrum.

An Airy wave transform is used to calculate the significant seabed velocity, and zero upcrossing wave period. The calculation is not valid in shallow water, or at elevations greater than half the water depth.

Reference : DNVGL-RP-F109 : On-Bottom Stability Design Of Submarine Pipelines (Download from the DNVGL website)

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CALCULATOR MODULE : DNVGL RP F109 Check Value   ±
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