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A new view on the Elbe – Dynamic and interactive 3D views for public information purposes in news media
In collaboration with the German newspaper WELT , a team of researchers from Hafen-City University Hamburg developed new views of the River Elbe, showing the riverbed in a couple of 3D interactive views and videos. These have been integrated into a multimedia special which follows the goal to give people better insights into the complex topic of the fairway adjustment of the Elbe. This contribution describes input data as well as its processing and visualisation.
DTM visualisation | dynamic views | interactive 3D views | public participation
- Ausgabe: HN 105 Seite: 56–58
- DOI: 10.23784/HN105-12
- Autor/en: Tanja Dufek, Johannes Kröger, Brendon Duncan, Jochen Schiewe
Burial depth determination of cables using acoustics – Requirements, issues and strategies
Depth-of-burial (DOB) surveys are well-known in the oil and gas business to obtain the exact position and burial depth of pipelines or cables after dredging and for regular maintenance. With expanding offshore wind farming in the wake of the »Energiewende« site explorations, route and cable DOB surveys become increasingly important in this industry, too. Various geophysical methods like magnetic, electro-magnetic and acoustic sensors are used to detect and track buried cables. For best detection probability of buried cables to date mostly lines crossing the expected cable route are surveyed. Although this is suited to detect the cable and get its position with high accuracy, survey companies require more efficient technologies, accounting for both, operational and processing costs. Thus they are looking for easy to operate equipment that follows the cable along its actual route, works at different water depths, weather and seabed conditions and gives immediate and reliable results to produce deliverables with high accuracy of XYZ cable positions.
detection of buried objects | acoustic cable tracking | depth of burial – DOB | sub-bottom profiler – SBP
- Ausgabe: HN 105 Seite: 50–54
- DOI: 10.23784/HN105-11
- Autor/en: Jens Wunderlich, Jan Arvid Ingulfsen, Sabine Müller
The challenge of choosing the right method for surveying power cables
The rising number of wind parks, and thus the demand for new survey tasks, results in continuous development for companies working in the renewable energy sector. Building a wind park requires laying inter-array and export cables. Those cables are buried or covered to protect them, bringing environmental changes to a minimum. A common depth of burial ranges from 1.5 m to 3 m. The challenge of surveying those buried power cables is choosing the right method.
cable tracking | depth of burial | HVAC/HVDC | survey power cables
- Ausgabe: HN 105 Seite: 47–49
- DOI: 10.23784/HN105-10
- Autor/en: Oliver Anders
The search for Malaysian Airlines flight MH370
Even today, hydrographic surveys can reach the boundaries of what is technically possible, and project sizes as presented in this case study will push our ingenuity. The size-challenge can be defined by the extent of the project area, the water depth, the number of vessels/equipment involved, the data volume or all of the above. On 8 March 2014 the Malaysian airplane MH370 scheduled on a flight from Kuala Lumpur to Bejing with 239 people on-board went missing. This tragedy started a marine search and rescue mission, which turned later into the largest aircraft accident investigation in history. This case study presents a summary of the underwater search of this investigation. The mainly uncharted search area in the southern Indian Ocean of 120,000 square kilometres reaches water depths of up to 6,000 metres. The operation was planned in three phases: a deepwater multibeam survey to map the seafloor and enable a detailed search, the detailed survey to find the aircraft, and at last a recovery survey.
aircraft search | ultra-deep survey | deep-tow system | Indian Ocean
- Ausgabe: HN 105 Seite: 44–46
- DOI: 10.23784/HN105-09
- Autor/en: Melanie Barth
Offshore unexploded ordnance recovery and disposal
Millions of tons of unexploded ordnance (UXO) and discarded explosive remnants from war can be found in European waters and beyond. Many of them are next to the shoreline, dispensing toxics to the environment. Dumping of ammunition, military practice and warfare are the main source for this large amount posing a risk for the offshore industry besides the undeniable impact this also causes to the environment. With increasing utilisation of offshore areas, the activities in offshore UXO clearance have increased. Due to the governmental commitment and planning of increased usage of offshore wind energy in Germany, research has been conducted to solve the technical question of unexploded ordnance recovery and disposal. Within the last five years, the market for offshore UXO detection and removal has multiplied as well as experience increased, research has also lead to better analytical results during the UXO survey campaign which has helped achieve fewer false alarms. Better techniques and the development of specialist equipment for the removal results in smaller time frames in which the clearance can be done as well as lower risk for equipment and personnel. Research is also being conducted on how to handle ammunition safely which is classified as not save to transport without the normal demolition procedure.
UXO | unexploded ordnance | investigation | metal detector | recovery | disposal | underwater positioning
- Ausgabe: HN 105 Seite: 40–42
- DOI: 10.23784/HN105-08
- Autor/en: Jan Kölbel, David Rose