Bremenports GmbH and Co. KG

Bremerhaven, Germany

Bremenports GmbH and Co. KG

Bremerhaven, Germany
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Kemayou Tchamako E.,Bremen University of Applied Sciences | Koppev B.,Bremen University of Applied Sciences | von Bargen U.,Bremenports GmbH and Co. KG
River Sedimentation - Proceedings of the 13th International Symposium on River Sedimentation, ISRS 2016 | Year: 2017

For the calibration and validation of the Luneplate tidal polder numerical model, two field investigations were carried out on the 14th July and 21st August 2015. Data on the flow velocity, water salinity and turbidity were obtained during one complete tidal cycle, both on the Luneplate tidal Polder and on the adjacent LowerWeser River. The results confirm the ebb-dominated tidal currents of theWeser Estuary, as high velocities, up to 135 cm/s were recorded during the Ebb period. In contrast to the Lower Weser, the Luneplate tidal polder is flood-dominated. The velocity peak was recorded here around high water level and maximal velocity values of 52 cm/s and 78 cm/s were respectively measured at the entrance of the secondary main tidal channel and near the tidal polder flood barrier. The variation of the freshwater discharge as well as the tidal range during the two surveys had affected the salt distribution and allowed to clearly draw the dependency of the tidal polder salinity to the flood salinity of the adjacent LowerWeser River. The averaged salinity values of the whole study area amount to 5-8 ppt during the flood and to 11-13 ppt for the ebb tide. The increase of the flow velocity during the flood tide led to a sediment redistribution within the water column. Average suspended sediment concentrations from 82 mg/l to 1, 012 mg/l were characteristic of the flood tide, while values from 60 mg/l to 1, 113 mg/l were obtained from the ebb measurements. The results also revealed that a more important amount of sediment flow into the tidal polder than out. Those sediments are mostly made up of silt, with up to 16 % organic matter content. © 2017 Taylor & Francis Group, London.

Qiu G.,University of Management and Technology | Hamann T.,University of Management and Technology | Grabe J.,University of Management and Technology | Hein C.,Bremenports GmbH and Co. KG | Howe R.,Bremenports GmbH and Co. KG
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2013

Jackup ships are built to transport wind turbines foundation between offshore logistics center and the installation site. It require sufficiently stable seabed next to quay walls. Otherwise jackup processes may reduce the stability of the quay wall and remained footprints of the legs could induce unsafe jackup procedures in the future. Foundations have been planned to improve the strength of seabed in front of the quay wall. The numerical analyses of the penetration/extraction processes of the legs into/out of the foundations were presented in OMAE2011-49928 to study the bearing capacity of two foundation designs (open-ended cylinder and bucket foundation). In consequence of the numerical studies, the bucket foundation was selected and was improved by reduction the height of the foundations and adjust the inclination of the inner wall to reduce the construction costs. Four bucket foundations have been built in Bremerhaven, Germany. This paper provided of a resume of design, construction and set-up process. The penetration and extraction processes of the jackup legs were tested the results were compared with the numerical predictions. Copyright © 2013 by ASME.

Scholz A.,Bremenports GmbH and Co. KG | Pabst C.,Bremenports GmbH and Co. KG | Spekker H.,Projektleiter Inros Lackner AG
Wasser und Abfall | Year: 2012

In Bremen and Lower Saxony, the state protective dikes, quays and harbor facilities are being raised and reinforced for future flooding occurrences. Because the dike systems are not only for the utilization of flood control, but also a variety of other requirements, there are always new technical issues, which will be explained based on construction projects.

Herbort J.,Grbv Ingenieure im Bauwesen GmbH and Co. KG | Verch S.,Grbv Ingenieure im Bauwesen GmbH and Co. KG | Pabst C.,Bremenports GmbH and Co. KG
Bautechnik | Year: 2013

The grounds of the Naval Operations School between the bends in the River Geeste in Bremerhaven extend right up to the riverbanks on the northern, southern and western sides. After 80 years the sheet piling on the southern and western banks has become so badly corroded that repairing the wall would be uneconomic. Permission for the construction of a replacement wall was granted in February 2011. This article describes the boundary conditions for the design and construction work, especially the influence of the soft soils and groundwater situation so typical of this locality. The only answer to the abrupt change in level between the school grounds and the river is a heavyweight, combined sheet pile structure with piles up to 33 m long. Despite this, at most only the top 7.60 m of the wall is visible. The article also looks at the restrictions on site noise emissions laid down by the authorities. © 2013 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin.

Tesch A.,Planungsburo Tesch WBNL | Marchand M.,KuFOG GmbH | Ebert C.,Bremenports GmbH and Co. KG | Wellm H.,Bremenports GmbH and Co. KG
Naturschutz und Landschaftsplanung | Year: 2010

The restoration of tide-influenced foreshores in estuaries can require compensation measures in the inland in order to balance the loss of grasslands by shifting biotope functions to another location. The study summarises experiences how to establish temporarily flooded grasslands in the marsh, particularly in view of bird protection. It bases on efficiency reviews of comprehensive compensation schemes along the lower Weser River over at least ten years. The results are compared to the changes on the restored foreshores. Finally the study draws general conclusions for nature conservation measures along lower courses of rivers. © 2010 Verlag Eugen Ulmer.

Qiu G.,University of Management and Technology | Grabe J.,University of Management and Technology | Kukolka N.,Bremenports GmbH and Co. KG | Vollstedt H.-W.,Bremenports GmbH and Co. KG
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2011

New Jack-up ships are built to transport offshore wind turbines from harbor and assemble them with the help of cranes on the ship at the site of installation. Every ship has four stilts, which can be lowered to seabed and jack the ship up. However, penetration and extraction the stilts at the harbor area could jeopardize the existing quay wall construction. In this paper two conceptual designs of foundations, which are used to improve the strength of the seabed in front of the quay wall, are investigated using numerical methods. Through soil exchange in openended cylinder or bucket foundation the strength of the seabed should be improved so that jack-up ships can dock directly at the quay wall and lower the stilts into the foundations. Three dimensional finite element analysis using a coupled Eulerian- Lagrangian method (CEL) are carried out to simulate penetration and extraction process. A hypoplastic constitutive model and the Mohr-Coulomb constitutive model are used to describe the filling. The studies of influences of geometry of foundations as well as the soil parameters on the bearing capacity of stilts and failure mechanism in foundations are carried out as the design basis of the foundations. Copyright © 2011 by ASME.

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