Model sea floor and soil contact for slender system lines The seafloor/soil models can be split into three groups Seafloor contact : Structures laying on the sea floor Soil contact : Structures penetration the soil Alternative methods covers both group a and b. See Contact Formulation 1. Sea floor contact (a) The seafloor contact formulation includes contact normal to the seafloor modelled by springs in-plane contact modelled by a combination of springs and frictional forces. Sea floor contact specification Specify the relation between the sea floor contact and the line ID and line segments See Sea floor contact specification 2. Riser soil (a) The contact model includes in addition to the sea floor contact nonlinear stiffness as the pipe is pressed into the seafloor and a separate unloading curve as the pipe is lifted suction forces are activated as the pipe is lifted off the seafloor See Riser soil model. 3. Geotechnical spring specification (b) Used to specify geotechnical springs in the global X-Y plane suitable for modelling cyclic geotechnical data with degradation See Geotechnical spring 4. Geotechnical soil model (b) The input to the geotechnical soil model consists of Materials. The options are Clay, see Goetechnical model - Clay Material Sand, see Goetechnical model - Sand Material The Geotechnical specification Defines the soil types as a function of the depth See Geotechnical model The Geotechnical line Specification Links the geotechnical input to a line ID 5. PISA Soil Model (b) Soils for use with the soil layer profile definition, intended for modelling of embedded piles The input to the PISA Soil Model consists of Soil components. The options are Pisa Clay Pisa Sand Dunkirk sand Pisa Soil layer profile The soil layer profile is a vertical slice of soil layers with specified thickness The soil characteristics are specified in Soils 6. Alternative methods to model sea floor and soil contact (c) Option I: See Global springs Option II: See User defined elements External Wrapping Seafloor Contact