Searched for: +
(1 - 20 of 40)

Pages

document
Ainslie, M.A. (author), de Jong, C.A.F. (author), Robinson, S.P. (author), Lepper, P.A. (author)
To meet the growing demand for carbon-free energy sources, the EU has ambitious plans to increase its capacity for generation of offshore wind power. The UK and Netherlands, for example, plan to increase their offshore power generating capacity, respectively, to 33 and 6 gigawatts by the year 2020. Assuming that this power is generated entirely...
conference paper 2010
document
Kastelein, R.A. (author), Steen, N. (author), de Jong, C.A.F. (author), Wensveen, P.J. (author), Verboom, W.C. (author)
Naval sonar systems produce signals which may affect the behavior of harbor porpoises, though their effect may be reduced by ambient noise. To show how natural ambient noise influences the effect of sonar sweeps on porpoises, a porpoise in a pool was exposed to 1-s duration up-sweeps, similar in frequency range (6-7 kHz) to those of existing...
article 2011
document
Kastelein, R.A. (author), Wensveen, P.J. (author), Terhune, J.M. (author), de Jong, C.A.F. (author)
Equal-loudness functions describe relationships between the frequencies of sounds and their perceived loudness. This pilot study investigated the possibility of deriving equal-loudness contours based on the assumption that sounds of equal perceived loudness elicit equal reaction times (RTs). During a psychoacoustic underwater hearing study, the...
article 2011
document
Kastelein, R.A. (author), Hoek, L. (author), de Jong, C.A.F. (author)
The distance at which active naval sonar signals can be heard by harbor porpoises depends, among other factors, on the hearing thresholds of the species for those signals. Therefore the hearing sensitivity of a harbor porpoise was determined for 1 s up-sweep and down-sweep signals, mimicking mid-frequency and low-frequency active sonar sweeps ...
article 2011
document
Ainslie, M.A. (author), de Jong, C.A.F. (author)
Early human interest in ambient noise in the sea, especially during and after the Second World War, resulted from its effect on limiting the performance of military search sonar [Urick 1983]. While that interest continues, it is now accompanied by non-military uses of underwater sound, such as navigation, fisheries, oceanography and seismic...
conference paper 2011
document
Kastelein, R. (author), Gransier, R. (author), van Mierlo, R. (author), Hoek, L. (author), de Jong, C.A.F. (author)
To set safety criteria for levels of sounds produced during pile driving for offshore wind parks, temporary hearing threshold shifts sTTSsd were studied in a harbor porpoise and two harbor seals. A psychoacoustic behavioral technique was used to quantify TTS and hearing recovery in the animals exposed to underwater sounds swhite noise in a 1/1...
article 2011
document
Kastelein, R.A. (author), Hoek, L. (author), de Jong, C.A.F. (author)
article 2011
document
Ainslie, M.A. (author), de Jong, C.A.F. (author), Robinson, S.P. (author), Lepper, P.A. (author)
To meet the growing demand for carbon-free energy sources, the European Union (EU) has ambitious plans to increase its capacity for generation of offshore wind power. The United Kingdom and The Netherlands, for example, plan to increase their offshore power-generating capacity to 33 and 6 GW, respectively, by the year 2020. Assuming that this...
bookPart 2012
document
Kastelein, R.A. (author), Steen, N. (author), Gransier, R. (author), Wensveen, P.J. (author), de Jong, C.A.F. (author)
Mid-frequency and low-frequency sonar systems produce frequency-modulated sweeps which may affect harbor porpoises. To study the effect of sweeps on behavioral responses (specifically startle responses, which we define as sudden changes in swimming speed and/or direction), a harbor porpoise in a large pool was exposed to three pairs of sweeps: a...
article 2012
document
Lepper, P.A. (author), Robinson, S.P. (author), Ainslie, M.A. (author), Theobald, P.D. (author), de Jong, C.A.F. (author)
The installation of offshore wind farms in European waters and the scale of the planned activity have led to concern over the generation of noise and its potential impact on marine life. Much of this concern is centered around the noise generated by pile driving, which is used for the installation of the turbine foundations, and its potential...
bookPart 2012
document
Jansen, H.W. (author), de Jong, C.A.F. (author), Jung, B. (author)
Because of the concern about potential effects on marine pile driving, the industry is developing silent marine pile driving concepts. One of the new concepts, which has been engineered by IHC Hydrohammer in the Netherlands, is the application of a steel Noise Mitigation Screen (NMS) around the pile with the option of an additional confined air...
conference paper 2012
document
Kastelein, R.A. (author), Gransier, R. (author), Hoek, L. (author), de Jong, C.A.F. (author)
The distance at which harbor porpoises can hear underwater detonation sounds is unknown, but depends, among other factors, on the hearing threshold of the species for impulsive sounds. Therefore, the underwater hearing threshold of a young harbor porpoise for an impulsive sound, designed to mimic a detonation pulse, was quantified by using a...
article 2012
document
de Jong, C.A.F. (author), Quesson, B.A.J. (author), Ainslie, M.A. (author), Vermeulen, R.C.N. (author)
The NATO standard ‘AMP-15’ [1] provides procedures for the measurement and reporting of the acoustic signature of ships and for the establishment of acoustic signature goals to counter the naval mine threat. Measurements are carried out at dedicated shallow water acoustic ranges. Measurements according to this procedure of the same ship at the...
conference paper 2012
document
Carlson, T.J. (author), de Jong, C.A.F. (author), Dekeling, R.P.A. (author)
The workshop looked at the assessment of risk to aquatic animals exposed to anthropogenic sound. The discussion focused on marine mammals given the worldwide attention being paid to them at the present time, particularly in relationship to oil and gas exploration, ocean power, and increases in ship traffic
bookPart 2012
document
Kastelein, R.A. (author), Hoek, L. (author), Gransier, R. (author), de Jong, C.A.F. (author)
Pile driving is presently the most common method used to attach wind turbines to the sea bed. To assess the impact of pile driving sounds on harbor porpoises, it is important to know at what distance these sounds can be detected. Using a psychophysical technique, a male porpoise’s hearing thresholds were obtained for series of five pile driving...
article 2013
document
de Jong, C.A.F. (author), Ainslie, M.A. (author), Heinis, F. (author), Janmaat, J. (author)
The Port of Rotterdam is expanding to meet the growing demand to accommodate large cargo vessels. One of the licensing conditions was the monitoring of the underwater sound produced during its construction, with an emphasis on the establishment of acoustic source levels of the Trailing Suction Hopper Dredgers during their various activities:...
conference paper 2013
document
Kastelein, R.A. (author), Steen, N. (author), Gransier, R. (author), de Jong, C.A.F. (author)
article 2013
document
Thomsen, F. (author), Borsani, F. (author), Clarke, D. (author), de Jong, C.A.F. (author), de Witt, P. (author), Holtkamp, M. (author), Goethals, F. (author), San Martin, E. (author), Spadaro, P. (author), van Raalte, G. (author), Jensen, A. (author)
The World Organisation of Dredging Associations (WODA) has identified underwater sound as an environmental issue that needs further consideration. A WODA Expert Group on Underwater Sound (WEGUS) was established to provide a guidance paper on dredging sound, impact on aquatic biota and advice on underwater sound monitoring procedures. The paper...
conference paper 2013
document
Ainslie, M.A. (author), de Jong, C.A.F. (author)
After centuries of speculation, punctuated by occasional theoretical or experimental advances, the first intensive research into underwater sound took place 100 years ago, applied initially to provide advance warning of icebergs after the loss of RMS Titanic in 1912, and later to counter the U-boat threat during World War I. The need to...
conference paper 2013
document
Zampolli, M. (author), Nijhof, M.J.J. (author), de Jong, C.A.F. (author), Ainslie, M.A. (author), Jansen, E.H.W. (author), Quesson, B.A.J. (author)
The acoustic radiation from a pile being driven into the sediment by a sequence of hammer strikes is studied with a linear, axisymmetric, structural acoustic frequency domain finite element model. Each hammer strike results in an impulsive sound that is emitted from the pile and then propagated in the shallow water waveguide. Measurements from...
article 2013
Searched for: +
(1 - 20 of 40)

Pages