JR
J.T.J. Rigter
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1
Going-on-Location (GoL) is a critical phase in jack-up vessel operations, during which the unit transitions from a free-floating condition to seabed support. During touchdown, the spudcans may experience short-duration, high-magnitude impact forces due to the coupled effects of wave-induced vessel motions, nonlinear soil-spudcan contact, and leg deformation. Current GoL workability assessments rely on detailed time-domain simulations to determine impact forces, structural unity checks, and allowable sea states. Although these methods provide a physics-based basis for operational decision-making, they are computationally demanding and mainly describe simulation outcomes rather than the underlying relation between vessel motion and touchdown severity.
This thesis investigates whether the global mechanical energy response of a jack-up vessel can be used as a physically interpretable indicator for touchdown severity and GoL workability assessment. An energy formulation is developed within an existing time-domain GoL simulation framework and verified using energy and power balance relations. The method is applied to transient impact simulations with seabed contact enabled and to free-floating steady-state
simulations in which seabed contact is disabled.
The results show that global mechanical energy provides useful physical interpretation, but does not directly predict impact severity. Critical wave realisations do not exhibit a consistent pre-impact energy level, energy build-up, or common energy peak. Instead, elevated periods in the free-floating global mechanical energy response are most relevant when they occur within the
same time window as the touchdown interval identified in the corresponding impact simulation. Three-hour free-floating simulations can characterise the timing, magnitude, and persistence of these elevated energy periods, but do not provide a consistent threshold between allowable and non-allowable GoL cases.
It is concluded that global mechanical energy should not be used as a standalone workability criterion. Its main value lies in identifying potentially critical response periods and interpreting touchdown behaviour relative to seabed contact. Future work should focus on near-touchdown and initial-contact simulations to relate energy transfer more directly to impact magnitude, while RAO-based reconstruction of the free-floating energy response could be investigated as an efficient screening method. ...
This thesis investigates whether the global mechanical energy response of a jack-up vessel can be used as a physically interpretable indicator for touchdown severity and GoL workability assessment. An energy formulation is developed within an existing time-domain GoL simulation framework and verified using energy and power balance relations. The method is applied to transient impact simulations with seabed contact enabled and to free-floating steady-state
simulations in which seabed contact is disabled.
The results show that global mechanical energy provides useful physical interpretation, but does not directly predict impact severity. Critical wave realisations do not exhibit a consistent pre-impact energy level, energy build-up, or common energy peak. Instead, elevated periods in the free-floating global mechanical energy response are most relevant when they occur within the
same time window as the touchdown interval identified in the corresponding impact simulation. Three-hour free-floating simulations can characterise the timing, magnitude, and persistence of these elevated energy periods, but do not provide a consistent threshold between allowable and non-allowable GoL cases.
It is concluded that global mechanical energy should not be used as a standalone workability criterion. Its main value lies in identifying potentially critical response periods and interpreting touchdown behaviour relative to seabed contact. Future work should focus on near-touchdown and initial-contact simulations to relate energy transfer more directly to impact magnitude, while RAO-based reconstruction of the free-floating energy response could be investigated as an efficient screening method. ...
Going-on-Location (GoL) is a critical phase in jack-up vessel operations, during which the unit transitions from a free-floating condition to seabed support. During touchdown, the spudcans may experience short-duration, high-magnitude impact forces due to the coupled effects of wave-induced vessel motions, nonlinear soil-spudcan contact, and leg deformation. Current GoL workability assessments rely on detailed time-domain simulations to determine impact forces, structural unity checks, and allowable sea states. Although these methods provide a physics-based basis for operational decision-making, they are computationally demanding and mainly describe simulation outcomes rather than the underlying relation between vessel motion and touchdown severity.
This thesis investigates whether the global mechanical energy response of a jack-up vessel can be used as a physically interpretable indicator for touchdown severity and GoL workability assessment. An energy formulation is developed within an existing time-domain GoL simulation framework and verified using energy and power balance relations. The method is applied to transient impact simulations with seabed contact enabled and to free-floating steady-state
simulations in which seabed contact is disabled.
The results show that global mechanical energy provides useful physical interpretation, but does not directly predict impact severity. Critical wave realisations do not exhibit a consistent pre-impact energy level, energy build-up, or common energy peak. Instead, elevated periods in the free-floating global mechanical energy response are most relevant when they occur within the
same time window as the touchdown interval identified in the corresponding impact simulation. Three-hour free-floating simulations can characterise the timing, magnitude, and persistence of these elevated energy periods, but do not provide a consistent threshold between allowable and non-allowable GoL cases.
It is concluded that global mechanical energy should not be used as a standalone workability criterion. Its main value lies in identifying potentially critical response periods and interpreting touchdown behaviour relative to seabed contact. Future work should focus on near-touchdown and initial-contact simulations to relate energy transfer more directly to impact magnitude, while RAO-based reconstruction of the free-floating energy response could be investigated as an efficient screening method.
This thesis investigates whether the global mechanical energy response of a jack-up vessel can be used as a physically interpretable indicator for touchdown severity and GoL workability assessment. An energy formulation is developed within an existing time-domain GoL simulation framework and verified using energy and power balance relations. The method is applied to transient impact simulations with seabed contact enabled and to free-floating steady-state
simulations in which seabed contact is disabled.
The results show that global mechanical energy provides useful physical interpretation, but does not directly predict impact severity. Critical wave realisations do not exhibit a consistent pre-impact energy level, energy build-up, or common energy peak. Instead, elevated periods in the free-floating global mechanical energy response are most relevant when they occur within the
same time window as the touchdown interval identified in the corresponding impact simulation. Three-hour free-floating simulations can characterise the timing, magnitude, and persistence of these elevated energy periods, but do not provide a consistent threshold between allowable and non-allowable GoL cases.
It is concluded that global mechanical energy should not be used as a standalone workability criterion. Its main value lies in identifying potentially critical response periods and interpreting touchdown behaviour relative to seabed contact. Future work should focus on near-touchdown and initial-contact simulations to relate energy transfer more directly to impact magnitude, while RAO-based reconstruction of the free-floating energy response could be investigated as an efficient screening method.
Student report
(2025)
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Sophie ten Hoor, Olivier Stades, Julia van Beurden, Jelle Rigter, Anahí Witzenburg, Floor Dijkstra, S.C. Santema, J.S. Hoving, José A. Á. Antolínez, A.T. Gebremariam, J. Dankelman, M. Walraven
The Port of Santa Fe was once a major hub for both domestic and international trade, but changing river dynamics have reduced its accessibility and economic importance. As a result, the port now faces the challenge of redefining its role and exploring new functions that reconnect the port with the public. The Dyke 2 waterfront in the Port of Santa Fe, is currently in a deteriorated and underdeveloped state, lacking essential public facilities, accessible green spaces, and safe access to the river. Most importantly, the site faces severe riverbank instability, confirmed by a calculated Safety Factor (SF) of 0.67.
This report presents an integrated vision and technical design for the sustainable redevelopment of the project site area, commissioned as an advisory document for the Ente Administrador del Puerto de Santa Fe (EAPSF). The project employed a strategic track, guided by four pillars, and a slope protection track, using a Multi-Criteria Decision Analysis (MCDA) to select a solution, resulting in a design containing both technical stability and a public urban concept.
The resulting urban concept, The Santa Fe Riverside Park, serves as a project embodying the strategic vision. The design integrates adaptive infrastructure, including stepped terraces and docking places, engineered to accommodate significant seasonal river fluctuations. This concept is supported by the delivery of a 15-year long-term roadmap. The unstable slope is protected using an ecosystem-friendly Articulated Concrete Block mattress system, improving the calculated sliding SF from 0.67 to 1.9, and achieving an erosion SF of 2.10.
Finally, the report provides the Port Authority with a strategic foundation of recommendations to realise the project.
...
This report presents an integrated vision and technical design for the sustainable redevelopment of the project site area, commissioned as an advisory document for the Ente Administrador del Puerto de Santa Fe (EAPSF). The project employed a strategic track, guided by four pillars, and a slope protection track, using a Multi-Criteria Decision Analysis (MCDA) to select a solution, resulting in a design containing both technical stability and a public urban concept.
The resulting urban concept, The Santa Fe Riverside Park, serves as a project embodying the strategic vision. The design integrates adaptive infrastructure, including stepped terraces and docking places, engineered to accommodate significant seasonal river fluctuations. This concept is supported by the delivery of a 15-year long-term roadmap. The unstable slope is protected using an ecosystem-friendly Articulated Concrete Block mattress system, improving the calculated sliding SF from 0.67 to 1.9, and achieving an erosion SF of 2.10.
Finally, the report provides the Port Authority with a strategic foundation of recommendations to realise the project.
...
The Port of Santa Fe was once a major hub for both domestic and international trade, but changing river dynamics have reduced its accessibility and economic importance. As a result, the port now faces the challenge of redefining its role and exploring new functions that reconnect the port with the public. The Dyke 2 waterfront in the Port of Santa Fe, is currently in a deteriorated and underdeveloped state, lacking essential public facilities, accessible green spaces, and safe access to the river. Most importantly, the site faces severe riverbank instability, confirmed by a calculated Safety Factor (SF) of 0.67.
This report presents an integrated vision and technical design for the sustainable redevelopment of the project site area, commissioned as an advisory document for the Ente Administrador del Puerto de Santa Fe (EAPSF). The project employed a strategic track, guided by four pillars, and a slope protection track, using a Multi-Criteria Decision Analysis (MCDA) to select a solution, resulting in a design containing both technical stability and a public urban concept.
The resulting urban concept, The Santa Fe Riverside Park, serves as a project embodying the strategic vision. The design integrates adaptive infrastructure, including stepped terraces and docking places, engineered to accommodate significant seasonal river fluctuations. This concept is supported by the delivery of a 15-year long-term roadmap. The unstable slope is protected using an ecosystem-friendly Articulated Concrete Block mattress system, improving the calculated sliding SF from 0.67 to 1.9, and achieving an erosion SF of 2.10.
Finally, the report provides the Port Authority with a strategic foundation of recommendations to realise the project.
This report presents an integrated vision and technical design for the sustainable redevelopment of the project site area, commissioned as an advisory document for the Ente Administrador del Puerto de Santa Fe (EAPSF). The project employed a strategic track, guided by four pillars, and a slope protection track, using a Multi-Criteria Decision Analysis (MCDA) to select a solution, resulting in a design containing both technical stability and a public urban concept.
The resulting urban concept, The Santa Fe Riverside Park, serves as a project embodying the strategic vision. The design integrates adaptive infrastructure, including stepped terraces and docking places, engineered to accommodate significant seasonal river fluctuations. This concept is supported by the delivery of a 15-year long-term roadmap. The unstable slope is protected using an ecosystem-friendly Articulated Concrete Block mattress system, improving the calculated sliding SF from 0.67 to 1.9, and achieving an erosion SF of 2.10.
Finally, the report provides the Port Authority with a strategic foundation of recommendations to realise the project.