The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform
J C Marty - One of the best experts on this subject based on the ideXlab platform.
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The DYFAMED series station: a reference to coastal studies in the Mediterranean sea
Oceans, 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomasses, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of a Observation Scientific Service of the marine environment from INSU /CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral imputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic imputs to the zone aera only though the atmosphere. Then, the observed system is independant from anthropogenic coastal imputs and constitute a reference area for the study of the "natural" variability ot Mediterranean sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and ryhtmicity in the coastal and open sea areas. A coastal perturbation may then produce modifications of this background evolution. The data presented here aim to characterize the hydrological and trophic seasonnal variations at the DYFAMED observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of pertubation processes, it is clear that a continuous record of selected parameters is necessary. We present here some data obtained using optical sensors (absorption/transmission at 9 wavelenght, which allow to attain some biogeochemical characteristics of waters) on the transect. These sensors will eventually be placed on Moorings in the future. A meterological buoy will be moored at the DYFAMED time series station in fall 1998 by Meteo-France, which will gave the local atmospheric forcings for monthly biogeochemical studies and possibly the support to oceanographic sensors.
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The Dyfamed time-series station: a reference to coastal studies in the Mediterranean sea
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomass, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the Sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of an Observation Scientific Service of the marine environment from INSU/CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral inputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic inputs to the zone are only through the atmosphere. Then, the observed system is independent from anthropogenic coastal inputs and constitute a reference area for the study of the "natural" variability of the Mediterranean environment. Since the northwestern Mediterranean Sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and rythmicity in the coastal and open sea areas. A coastal perturbation may then produces modifications of this background evolution. The data presented aim to characterize the seasonal variations at the and trophic observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of perturbation processes, it is clear that a continuous record of selected parameters is necessary.
I Vescovali - One of the best experts on this subject based on the ideXlab platform.
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The DYFAMED series station: a reference to coastal studies in the Mediterranean sea
Oceans, 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomasses, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of a Observation Scientific Service of the marine environment from INSU /CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral imputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic imputs to the zone aera only though the atmosphere. Then, the observed system is independant from anthropogenic coastal imputs and constitute a reference area for the study of the "natural" variability ot Mediterranean sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and ryhtmicity in the coastal and open sea areas. A coastal perturbation may then produce modifications of this background evolution. The data presented here aim to characterize the hydrological and trophic seasonnal variations at the DYFAMED observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of pertubation processes, it is clear that a continuous record of selected parameters is necessary. We present here some data obtained using optical sensors (absorption/transmission at 9 wavelenght, which allow to attain some biogeochemical characteristics of waters) on the transect. These sensors will eventually be placed on Moorings in the future. A meterological buoy will be moored at the DYFAMED time series station in fall 1998 by Meteo-France, which will gave the local atmospheric forcings for monthly biogeochemical studies and possibly the support to oceanographic sensors.
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The Dyfamed time-series station: a reference to coastal studies in the Mediterranean sea
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomass, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the Sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of an Observation Scientific Service of the marine environment from INSU/CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral inputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic inputs to the zone are only through the atmosphere. Then, the observed system is independent from anthropogenic coastal inputs and constitute a reference area for the study of the "natural" variability of the Mediterranean environment. Since the northwestern Mediterranean Sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and rythmicity in the coastal and open sea areas. A coastal perturbation may then produces modifications of this background evolution. The data presented aim to characterize the seasonal variations at the and trophic observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of perturbation processes, it is clear that a continuous record of selected parameters is necessary.
J L Colliat - One of the best experts on this subject based on the ideXlab platform.
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Design and Installation of Suction Anchor Piles at Soft Clay Site
Journal of Waterway Port Coastal and Ocean Engineering-asce, 1998Co-Authors: J L Colliat, P Boisard, P. Sparrevik, J.-c. GrametAbstract:Innovative suction anchor piles have been used for Permanent Mooring of a process and accommodation barge at an oil and gas field developed by ELF Congo in the Gulf of Guinea. Twelve Mooring lines, equipped with steel suction anchor piles, were successfully preinstalled at the site in July–August 1995, and the process barge was connected in early 1996 for the start of production. With a water depth ranging between 150 and 300 m, the Nkossa field is among the deepest ones offshore Western Africa to date, and the soils at the site consist of soft normally consolidated clays, representative of deep water sites. The anchoring system design is presented together with a description of the suction pile installation operations. The monitored performance of the suction piles during installation is evaluated, including the orientation and tilt at touchdown and the penetration rate during suction penetration. The installation behavior appeared to be easy and smooth, and the measured penetration resistances were in p...
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Design and Installation of Suction Anchor Piles at a Soft Clay Site in the Gulf of Guinea
Offshore Technology Conference, 1996Co-Authors: J L Colliat, P Boisard, J.-c. Gramet, P. SparrevikAbstract:Innovative shallow suction anchor piles have been used for Permanent Mooring of a process and accomodation barge at an oil and gas field developed by ELF Congo in the Gulf of Guinea. The 12 Mooring lines, equipped with 5m diameter and 13m high steel suction anchor piles, were successfully installed at the site in July/August 1995. The process barge is scheduled to be connected early 1996 for start of production. With a water depth of about 170m, the Nkossa field is the deepest in offshore Westem Africa to date. The soils at the site consist of soft normally consolidated clays, representative of deep water sites. The anchoring system design is presented, together with the description of the suction pile installation by underpressure. The monitored performance of the suction piles during installation is evaluated, including orientation and tilt at touch-down, and penetration rate during suction penetration. The installation behaviour appeared to be very smooth, and the measured penetration resistances were in perfect agreement with the predictions, thus demonstrating the reliability of the design installation method.
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caisson foundations as alternative anchors for Permanent Mooring of a process barge offshore congo
Publikasjon - Norges Geotekniske Institutt, 1995Co-Authors: J L Colliat, P Boisard, K Andersen, K SchroederAbstract:Shallow caisson foundations are considered as alternative anchors for Permanent Mooring of a process barge at an oil and gas field developed by ELF Congo in the Gulf of Guinea. The 12 Mooring lines are scheduled to be installed on site in July 1995 and the process barge will be connected in 1996 for start of production. With a water depth of about 170m, this field will be the deepest one offshore Western Africa to date. The soils at the site consist of soft normally consolidated clays. The paper presents the results of a comparative study of potential anchor solutions for this production barge, including high capacity drag anchors, driven piles, and shallow caisson foundations installed by underpressure. This comparative study, including design, construction, and installation of the Mooring system, has shown that the caisson foundations represent the best suited solution, technically as well as on an economical point of view, because of the following advantages: (1) vertical load capability, thus allowing to reduce the anchoring pattern, (2) once positioned on the seabed, the location of each anchor is fixed and known with accuracy, and (3) more simple and shorter installation procedure, since caisson anchors, as piles, do not require to be proof-loaded on site.
A. Stock - One of the best experts on this subject based on the ideXlab platform.
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The DYFAMED series station: a reference to coastal studies in the Mediterranean sea
Oceans, 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomasses, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of a Observation Scientific Service of the marine environment from INSU /CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral imputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic imputs to the zone aera only though the atmosphere. Then, the observed system is independant from anthropogenic coastal imputs and constitute a reference area for the study of the "natural" variability ot Mediterranean sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and ryhtmicity in the coastal and open sea areas. A coastal perturbation may then produce modifications of this background evolution. The data presented here aim to characterize the hydrological and trophic seasonnal variations at the DYFAMED observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of pertubation processes, it is clear that a continuous record of selected parameters is necessary. We present here some data obtained using optical sensors (absorption/transmission at 9 wavelenght, which allow to attain some biogeochemical characteristics of waters) on the transect. These sensors will eventually be placed on Moorings in the future. A meterological buoy will be moored at the DYFAMED time series station in fall 1998 by Meteo-France, which will gave the local atmospheric forcings for monthly biogeochemical studies and possibly the support to oceanographic sensors.
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The Dyfamed time-series station: a reference to coastal studies in the Mediterranean sea
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomass, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the Sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of an Observation Scientific Service of the marine environment from INSU/CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral inputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic inputs to the zone are only through the atmosphere. Then, the observed system is independent from anthropogenic coastal inputs and constitute a reference area for the study of the "natural" variability of the Mediterranean environment. Since the northwestern Mediterranean Sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and rythmicity in the coastal and open sea areas. A coastal perturbation may then produces modifications of this background evolution. The data presented aim to characterize the seasonal variations at the and trophic observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of perturbation processes, it is clear that a continuous record of selected parameters is necessary.
Jessica Chiaverini - One of the best experts on this subject based on the ideXlab platform.
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The DYFAMED series station: a reference to coastal studies in the Mediterranean sea
Oceans, 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomasses, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of a Observation Scientific Service of the marine environment from INSU /CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral imputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic imputs to the zone aera only though the atmosphere. Then, the observed system is independant from anthropogenic coastal imputs and constitute a reference area for the study of the "natural" variability ot Mediterranean sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and ryhtmicity in the coastal and open sea areas. A coastal perturbation may then produce modifications of this background evolution. The data presented here aim to characterize the hydrological and trophic seasonnal variations at the DYFAMED observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of pertubation processes, it is clear that a continuous record of selected parameters is necessary. We present here some data obtained using optical sensors (absorption/transmission at 9 wavelenght, which allow to attain some biogeochemical characteristics of waters) on the transect. These sensors will eventually be placed on Moorings in the future. A meterological buoy will be moored at the DYFAMED time series station in fall 1998 by Meteo-France, which will gave the local atmospheric forcings for monthly biogeochemical studies and possibly the support to oceanographic sensors.
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The Dyfamed time-series station: a reference to coastal studies in the Mediterranean sea
IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 1998Co-Authors: I Vescovali, K Oubelkheir, M D Pizay, Jessica Chiaverini, A. Stock, J C MartyAbstract:In the Mediterranean, seasonal variations of the trophic environment (primary production, specific biomass, particulate export) are extremely large, in response to physical constraints, specifically seawater temperature induced by seasonal exposure to the Sun. Since 1991, systematic biogeochemical studies were conducted at the DYFAMED site (28 nautical miles off Nice) with monthly cruises and continuous observation from a Permanent Mooring, in the form of an Observation Scientific Service of the marine environment from INSU/CNRS. The time-series station is located in the central zone of the Ligurian Sea, and protected from lateral inputs by the presence of the liguro-provencal front, acting as a barrier to exchanges with the coastal zone. The anthropic inputs to the zone are only through the atmosphere. Then, the observed system is independent from anthropogenic coastal inputs and constitute a reference area for the study of the "natural" variability of the Mediterranean environment. Since the northwestern Mediterranean Sea is relatively homogeneous in term of atmospheric forcings, it can be considered that these "natural" variations of marine environment occur with a comparable intensity and rythmicity in the coastal and open sea areas. A coastal perturbation may then produces modifications of this background evolution. The data presented aim to characterize the seasonal variations at the and trophic observation site. Some results of studies undertaken since 1997 on the Nice-Calvi (Corsica) transect are also presented in order to explore the synchronism between the temporal succession of species from coast to open sea. With the aim to reach the scale of perturbation processes, it is clear that a continuous record of selected parameters is necessary.