Objective
The subsurface structures of the sea floor can well be investigated with high resolution reflection seismic methods. Many geotechnical and environmental applications, however, need information on physical and chemical properties of sediments. For their assessment, penetration measurements are being developed combining bore hole logging and coring techniques.
Two types of penetration devices were tested. The geotechnical module operates on the sea floor. Engine driven penetration allows a well controlled insertion of sensors into the sediment with a speed of 2 cm/s. Four parameters are acquired to a depth of 2 m: cone resistance, sleeve friction, excess differential pore pressure and wet bulk density. Furthermore, a 2 m long core can be obtained per launching.
The geophysical in-situ probe is designed for penetrations of 10 m to 20 m into soft sediments, depending on their stiffness. The following parameters are assessed: wet bulk density, natural gamma radiation, electrical resistivity and compressional wave velocities. The sensors are mounted at the lower end of a 10-20 m long penetration tube, which is loaded by a lead weight of 1.5 t at the upper end. The system is lowered by the ships winch to the sea floor, where it penetrates gravitionally into the sediment with a speed of about 10 cm/s. The depth is controlled by a pressure sensor with an accuracy of 1 cm. The data are transferred by cable to the recording and controlling units on board ship.
Results of test measurements in the Baltic Sea show good correlation of physical parameters with siesmostratigraphic units. The geophysical in-situ probe penetration system is a fast and effective tool to assess physical parameters under in-situ conditions. The time for one measurement is only 2-3 minutes.
PROJECT DESCRIPTION:
The knowledge of the physical parameters of marine sediments is important for the identification of sediment types and for the in-situ estimation of the rigidity of the sea-floor. The application of borehole logging methods in a miniaturised form, with probes driven into the sea floor gives direct access to the seismic velocities, electrical conductivity, natural gamma radiation and the U.Th.K - content of the sediment. Other parameters such as porosity, density and permeability can be derived from the logging results. The dynamic shear modulus, which correlates with the shear strength, can be determined from the integrated compressional and shear wave experiment. The shear modulus will also be estimated from tube waves. In combination with high resolution seismic profiling methods, the new tool gives access to a 3-dimensional mapping of structures and the in-situ properties of marine sediments.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences physical sciences electromagnetism and electronics
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
You need to log in or register to use this function
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Data not available
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
24118 Kiel
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.