The German Offshore-Metmasts Amrumbank West and Arkonabecken

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successive measuring levels is about 10 m. The wind direction is recorded using conventional wind vanes. Furthermore, the wind is measured three-dimensionally by two ultrasonic anemometers. 3 Underwater measurements Utilisation of an oceanographic sensor ADCP is highly appropriate for monitoring numerous oceanographic parameters. ADCPs work by transmitting beams of acoustic energy and listening for the backscattered energy along the beam directions from small bubbles or particles in the water. In principle, ADCPs combine the functionality for measuring waves and currents in a single package. The installation of the ADCP is a special challenge. In many cases installation at the monopile has to be abandoned because the emitted signals would be reflected by the monopile, and the current to be measured would be strongly disturbed by the monopile. Therefore it is appropriate to lower the sensor to the seabed about 50m away from the monopile. However, this leads to further difficulties such as the risk of losing the protection against scouring at the ADCP or rather at its support, but this problem can be minimised by appropriate constructional design. It must also be taken into consideration that the support is constructed in a way that the sensor cannot be moved even by a strong current. Figure 14: The research platform Arkona Becken Südost
However, a risk exists that the instrument could be damaged by trawl nets or even lost. 4 Energy supply Renewable energies are essential contributors to a solution for the energy supply problem, because they give energy supply security, reducing dependency on Diesel fired generators. Our goal is to provide nearly 99% of the energy demand by solar and wind power. Small wind generators in combination with photovoltaic (PV) devices are an economically efficient way of obtaining a secure energy supply. A PV system consists of arrays of framed solar modules under a certain tilt angle. The generated energy is stored into a rechargeable battery (accumulator cells) in order to tide over periods of darkness and low irradiation intensity. The battery is also used to provide the energy required for operating all measuring equipment, the lights and the transponder (AIS) under worst case conditions. The battery unit is a combination of a battery with battery circuit breakers. These components have to be suitable for the harsh offshore environment. The units can incorporate different types of batteries, such as nickel cadmium and lead acid accumulator batteries for solar applications. Connecting cells and batteries in parallel and series provides the desired combination of battery voltage and capacity. Selecting the correct battery type is always crucial for the system. The backup for all these systems is the Diesel generator, chosen for this purpose because Diesel generators have no ignition systems, no carburetors, and no sparking plugs. The required maintenance of these generator types is small if they are used only as backup. Lessons learned Research platforms presently permit the most precise assessments of energy yields at offshore locations. This plays a decisive role for the implementation and funding of wind plants. Research platforms furthermore provide the possibility of contributing to the understanding of the relevant parameters and their interactions for offshore wind energy utilisation. The design of the data acquisition system functions very well [2]. Lightning strikes can be a problem for offshore installations. The environmental conditions offshore can be very hard in some cases. Underwater measuring technology requires special maintenance and is expensive. Redundancy is very important. It is very important to have many measuring instruments. Only proven instrumentation is utilised [2]. Data evaluation should take place in real time in order to detect any problems at an early stage.
Page 1 and 2: THE GERMAN OFFSHORE-METMASTS AMRUM
Page 3 and 4: Figure 2: Offshore windpark areas i
Page 5 and 6: Figure 4: Research platform Amrumba
Page 7: Most of the areas are flat. The oro

The German Offshore-Metmasts Amrumbank West and Arkonabecken

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