Klaus Betke

Klaus Betke
itap GmbH

About

21
Publications
16,649
Reads
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485
Citations
Citations since 2016
1 Research Item
240 Citations
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
2016201720182019202020212022010203040
Introduction
Skills and Expertise

Publications

Publications (21)
Article
An analysis is presented of sound measurements performed near two detonations of unexploded ordnance (UXO) in the North Sea, at distances ranging from 1.5 to 12 km. The charge masses of the detonations were 325 and 140 kg TNT equivalent. The objective of the measurements was to improve the accuracy of model predictions of the area where UXO detonat...
Article
Between April and August 2009, an extensive monitoring programme was carried out at alpha ventus to determine and quantify the underwater noise produced by the installation of the wind turbine foundations (jackets and tripods). The sound measurements took place between April and August 2009. Most recordings were made with autonomous systems. Measur...
Conference Paper
Full-text available
Underwater noise emissions from pile-driving during the construction of offshore wind farms can physically harm harbour porpoises in the vicinity of the construction site. In order to avoid injury to these animals, German legislation demands that pile-driving noise must not exceed 160dB re 1µ Pa (SEL) at 750 m distance from the sound source. Before...
Article
Full-text available
Although seal scarers are widely used both to reduce economic losses at fish farms caused by seal predation and to reduce risks posed to marine mammals by offshore pile driving activities, the spatial extent of their deterrent effect on harbour porpoises is still largely unclear. However, this information is crucial to understanding the effects the...
Article
Full-text available
Offshore pile driving, e. g. during wind farm construction, produces substantial noise emissions into the water column, which may harm marine mammals. Therefore, it is common practice to attempt to deter the mammals out of potential danger zones beforehand. Seal scarers are commonly used as a deterrent for harbour porpoises in spite of a lack of cl...
Article
Full-text available
The world’s growing demand for sustainable and environmentally friendly energy has led a growing number of countries to explore the options for the installation of offshore wind farms. In particular, noise emissions during the construction phase, when, in many cases, steel foundations are driven into the seafloor, are expected to cause temporal avo...
Technical Report
Full-text available
1. Offshore-Rammarbeiten zur Errichtung von Fundamenten für Offshore-Windenergieanlagen führen zu hohen Schallemissionen, die kurzzeitig eine großräumige Störung von marinen Säugetieren bewirken. 2. Die großen Wassertiefen der geplanten Offshore-Windparks bedingen insgesamt hohe konstruktive Anforderungen an Fundamente für große Windenergieanlagen,...
Article
The construction of several wind parks in the North and Baltic Sea and the associated pile driving could negatively affect the only resident cetacean species, the harbor porpoise. We studied the efficiency of a Lofitech sealscarer that emits pulses at a main frequency of 14 kHz to temporarily deter harbor porpoises during construction periods in or...
Article
Full-text available
Pile driving during offshore windfarm construction goes along with considerable noise emissions that potentially harm marine mammals in the vicinity and may cause large scale disturbances. Information on the scale of such disturbances is limited. Therefore, assessment and evaluation of the effects of offshore construction on marine mammals is diffi...
Chapter
Offshore wind energy is a new technology created by the merging of classical wind energy technology and classical offshore technology. Wind speeds are considerably higher over the sea as compared to onshore sites, but also the cost per installed kW will increase when moving offshore. The rapid development of wind energy use in Germany is accompanie...
Article
With the utilisation of offshore wind energy a new source of underwater noise is brought into the marine environment. Operating wind energy converters (WEC) will give rise for a change in the acoustic back- ground regime on quite a low but long lasting level. Furthermore during the installation phase the hydro sound might even exceed the threshold...
Article
Hearing thresholds for pure tones were measured under free-field listening conditions in the frequency range of 40 Hz-15 kHz. Results are consistent with the standard threshold specified in ISO 226 for frequencies up to 250 Hz, but a few dB below the ISO curve at higher frequencies. Thresholds are distributed normally on a logarithmic level scale w...

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