"uuid","repository link","title","author","contributor","publication year","abstract","subject topic","language","publication type","publisher","isbn","issn","patent","patent status","bibliographic note","access restriction","embargo date","faculty","department","research group","programme","project","coordinates" "uuid:05dde2aa-8c21-4fcb-a531-d541a60bc751","http://resolver.tudelft.nl/uuid:05dde2aa-8c21-4fcb-a531-d541a60bc751","Dynamic Assessment of the Bolivar Roads Navigational Barge Gate Barrier","Smulders, J.","Jonkman, S.N. (mentor); Vrouwenvelder, A.C.W.M. (mentor); Van der Toorn, A. (mentor); Metrikine, A. (mentor); Willems, A. (mentor)","2014","The devastation caused by Hurricane Ike in the Galveston Bay area (Texas, United States of America) proved the necessity of an improved water defense. Multiple flood risk reduction studies were undertaken. The Texas A&M University of Galveston proposed the Ike Dike, a fortification of the coastal spine to prevent a storm surge from entering the Galveston Bay. It includes construction of a storm surge barrier at the Bolivar Roads inlet (3 km) consisting of a navigational section to close of the Houston Ship Channel and a wide shallow environmental section. For the environmental section a preliminary design was made by De Vries (2014). For the navigational section (span of 220 m) the project group (IV-infra, DUT and Royal HaskoningDHV) concluded that a barge gate with a length of 240 m, width of 40 m and height of 20 m seems a suitable solution. The barge is stored parallel to the channel and connected to the shore by a hinge. Approximately 30 hours before landfall of a hurricane, the barge is set afloat and swings 90 degrees around a hinge to two concrete abutments and is immersed. The barge will now act as a simple supported beam and a 1 m high gap is present below the barge. Once the hurricane has passed the barge is set afloat and returned to the storage area. A structural design with static loads has been developed by IV-infra. The dynamic behavior and response to wave and current excitation is not included in this structural design, which is essential information to determine the technical feasibility of this design. This dynamic behavior is investigated in this report. To do so the following phases of a complete closing cycle are distinguished which are assessed separately: Swing operation, immersion operation, landing, closed position and occurrence of a negative head (a bayside water level exceeding the seaside water level). Next to these phases it is assessed if a concrete or steel barge is preferable. First a wave study was completed to determine the governing closing wave conditions and hurricane wave conditions. Swing operation: The barge is closed in one hour with anchor lines connected to the abutment and storage area. During the swing operation the roll motion is governing. But can be reduced by introducing ballast water in the outer compartments of the barge or a different configuration of the anchor lines. Immersion operation and landing: The barge is immersed with pumps and valves in one hour. During the immersion operation the stick slip mechanism will occur but the duration will be limited and will not result in problems. For increasing drafts the heave, sway and roll response will increase slightly but stay within acceptable limits. Closed position: The overall motion of the simple supported barge will consist of a combined torsion, vertical bending and horizontal bending motion. Due to the high underflow velocity the barge is prone to self-excitation in vertical, horizontal and torsion direction. The impact is expected to be limited due to outflow of water in the longitudinal direction and the influence of turbulence but substantial research is required into this topic. The first natural frequency in vertical bending is close to the peak of the wave spectrum. The bayside water level may exceed the seaside water level, a stop block is required to ensure the barge does not slide off the abutment. A concrete barge has been compared to a steel barge. For a first estimate the dynamic response of a concrete barge is slightly better. For future research it is recommended assess the self-excitation in closed position with a scale model.","dynamic; barge; gate; stability; hydrodynamic; Bolivar; roads; ike; dike; immersion; swing; operation; hydraulic; engineering; civil","en","master thesis","","","","","","","","","Civil Engineering and Geosciences","Hydraulic Engineering","","","","29.20496356, -94.4644214"