Searched for: author%3A%22Lam%2C+F.P.A.%22
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Kvadsheim, P.H. (author), Miller, P.J.O. (author), Tyack, P.L. (author), Sivle, L.D. (author), Lam, F.P.A. (author), Fahlman, A. (author)
Naval sonar has been accused of causing whale stranding by a mechanism which increases formation of tissue N2 gas bubbles. Increased tissue and blood N2 levels, and thereby increased risk of decompression sickness (DCS), is thought to result from changes in behavior or physiological responses during diving. Previous theoretical studies have used...
article 2012
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Sivle, L.D. (author), Kvadsheim, P.H. (author), Fahlman, A. (author), Lam, F.P.A. (author), Tyack, P.L. (author), Miller, P.J.O. (author)
Anthropogenic underwater sound in the environment might potentially affect the behavior of marine mammals enough to have an impact on their reproduction and survival. Diving behavior of four killer whales (Orcinus orca), seven long-finned pilot whales (Globicephala melas), and four sperm whales (Physeter macrocephalus) was studied during...
article 2012
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Lam, F.P.A. (author)
Walvissen ‘kijken’ onder water met hun oren, maar er zijn steeds meer geluidsbronnen op zee. Hoe komen we er achter wanneer walvissen last krijgen van het onderwatergeluid dat door de mens wordt gemaakt? Een van deze geluidsbronnen is sonar van de marine voor het opsporen van onderzeeboten. TNO onderzoekt de mogelijke (gedrags)effecten op...
article 2012
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von Benda-Beckmann, A.M. (author), Lam, F.P.A. (author), Moretti, D.J. (author), Fulkerson, K. (author), Ainslie, M.A. (author), van IJsselmuide, S.P. (author), Theriault, J. (author), Beerens, S.P. (author), TNO Defensie en Veiligheid (author)
The detection performance of a towed hydrophone array for deep-diving species is quantified by comparing detections of echolocation clicks from foraging groups of Blainville’s beaked whales (Mesoplodon densirostris) from the TNO Delphinus array to detections from bottom-mounted hydrophones at the Atlantic Undersea Test and Evaluation Center ...
article 2010
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Doksæter, L. (author), Godø, O.R. (author), Handegard, N.O. (author), Kvadsheim, P.H. (author), Lam, F.P.A. (author), Donovan, C. (author), Miller, P.J.O. (author), TNO Defensie en Veiligheid (author)
Military antisubmarine sonars produce intense sounds within the hearing range of most clupeid fish. The behavioral reactions of overwintering herring (Clupea harengus) to sonar signals of two different frequency ranges (1–2 and 6–7 kHz), and to playback of killer whale feeding sounds, were tested in controlled exposure experiments in Vestfjorden...
article 2009
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te Raa, L.A. (author), Lam, F.P.A. (author), Schouten, M.W. (author), Janmaat, J. (author), TNO Defensie en Veiligheid (author)
Spatial and temporal variations in sound speed can have substantial effects on sound propagation and hence sonar performance. Operational oceanographic models can provide forecasts of oceanographic variables as temperature, salinity and sound speed up to several days ahead. These four-dimensional forecasts can be used as input for a sonar...
conference paper 2009
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TNO Defensie en Veiligheid (author), Lam, F.P.A. (author), Haley Jr., P.J. (author), Janmaat, J. (author), Lermusiaux, P.F.J. (author), Leslie, W.G. (author), Schouten, M.W. (author), te Raa, L.A. (author), Rixen, M. (author)
Systems capable of forecasting ocean properties and acoustic performance in the littoral ocean are becoming a useful capability for scientific and operational exercises. The coupling of a data-assimilative nested ocean modeling system with an acoustic propagation modeling syste was carried out at sea for the first time, within the scope of...
article 2009
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Sheldon-Robert, M.K. (author), Beerens, S.P. (author), Lam, F.P.A. (author), TNO Defensie en Veiligheid (author)
To protect marine mammals from potential negative impacts of high-power sound from tactical sonar, the use of passive acoustic monitoring prior and during sonar exercises is a possible non-intrusive solution for the monitoring requirements for naval forces. Particularly deep-diving beaked whales seem sensitive to sound from tactical mid...
conference paper 2008
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Lam, F.P.A. (author), Maas, L.R.M. (author), TNO Defensie en Veiligheid (author)
An experiment which discussed the appearance of an internal wave attractor in a uniformly stratified, free-surface fluid [Maas, L.R.M., Benielli, D., Sommeria, J., Lam, F.-P.A., 1997. Observation of an internal wave attractor in a confined, stably stratified fluid. Nature 388(6642), 557–561] is revisited. This is done in order to give a more...
article 2008
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Lam, F.P.A. (author), Benders, F.P.A. (author), Robert, M.K. (author), TNO Defensie en Veiligheid (author)
Detailed information and a fundamental understanding of the marine environment will make the difference in operating effective and responsible for-naval puposes.
article 2007
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TNO Defensie en Veiligheid (author), Kvadsheim, P.H. (author), Benders, F.P.A. (author), Miller, P. (author), Doksµter, L. (author), Knudsen, F. (author), Tyack, P. (author), Kleivane, L. (author), God°, O.R. (author), Norlund, N. (author), Lam, F.P.A. (author), Samarra, F. (author)
This report summarises the outcome of an international research cruise in Norwegian waters (Vestfjorden) in November 2006. The objectives of the trial were to study impacts of military low frequency - (LFAS 1-2 kHz) and mid frequency - (MFAS 6-7 kHz) active sonars on killer whales and herring. In addition the capability of active and passive...
report 2007
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TNO Defensie en Veiligheid (author), Lam, F.P.A. (author)
This thesis addresses the observation, analysis and dynamics of waves as being trapped, generated and focused by sloping topography. Three different phenomena are described and are introduced in the introduction (chapter 1).
doctoral thesis 2007
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Lam, F.P.A. (author), Benders, F.P.A. (author), van IJsselmuide, S.P. (author), Verboom, W.C. (author), Camphuijsen, C.J. (author), TNO Defensie en Veiligheid (author)
From 28 June to 7 July 2005 the Netherlands Marine mammal Observations trial “NEMO” took place with HNLMS Mercuur. A track was sailed from Taranto (Italy) to La Coruña (Spain), passing the Straits of Messina and Gibraltar. Underwater acoustic transients were passively detected and classified with two towed arrays: the ‘operational’ CAPTAS array...
conference paper 2006
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Lam, F.P.A. (author), TNO Defensie en Veiligheid (author)
Naval operations in coastal waters are a huge challenge for modelling support in several disciplines. For example, any decision dependent on sonar performance could be depending on a proper translation of input from a reliable oceanographic model, that relies itself on reliable input from a meteorological model. Obvious to mention that many...
conference paper 2006
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Lam, F.P.A. (author), Konijnendijk, N.J. (author), Groen, J. (author), Simons, D.G. (author), TNO Defensie en Veiligheid (author)
Simulation of acoustic data is a powerful tool for developing and testing sonar signal processing. This paper describes how TNO’s simulator SIMONA is extended with realistic background reverberation, including wideband (non- Rayleigh) statistics of the signal. The statistical behavior of the received signals changes when multipath is present....
conference paper 2006
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Lam, F.P.A. (author), Beerens, S.P. (author), Ainslie, M.A. (author), TNO Defensie en Veiligheid (author)
Naval operations in coastal waters are challenging the modelling support in several disciplines. An important instrument for undersea defence in the littoral is the LFAS sonar. To adapt to the local acoustic environment, LFAS sonars can adjust their operation depth to increase the coverage of the sonar. The optimal depth can be determined by a...
conference paper 2006
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Ainslie, M.A. (author), Dybedal, J. (author), Lam, F.P.A. (author), Simons, D.G. (author), Snellen, M. (author), TNO Defensie en Veiligheid (author)
The sensitivity of sound speed to temperature makes it possible to use an echo sounder as a thermometer, provided that the salinity and water depth are known with sufficient precision. Could ‘echothermometry’ – i.e., the use of an echo sounder, or a network of echo sounders, to measure temperature in this way – provide a viable alternative to...
conference paper 2005
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Lam, F.P.A. (author), TNO Defensie en Veiligheid (author)
Naval operations in coastal waters are a huge challenge for modelling support in several disciplines. For example, any decision dependent on sonar performance could be depending on a proper translation of input from a reliable oceanographic model, that relies itself on reliable input from a meteorological model. Obvious to mention that many...
conference paper 2005
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Gerkema, T. (author), Lam, F.P.A. (author), Maas, L.R.M. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Internal tides in the Bay ofBiscay are studied using a numerical linear hydrostatic internal-tide generation model, in which along-slope uniformity is assumed. The focus is on the seasonal changes in the generation and dynamics. The results are compared with observations made near the shelf-break in early summer. They were obtained using a towed...
article 2004
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Gerkema, T. (author), Maas, L.R.M. (author), Lam, F.P.A. (author), TNO Fysisch en Elektronisch Laboratorium (author)
Theoretical and laboratory models show that internal-wave energy in continuously stratified fluids propagates in the vertical plane, at an angle set by the wave, buoyancy and Coriolis frequencies. Repeated Acoustic Doppler Current Profiler observations on three transects, crossing the shelf edge, now directly reveal this beam-wise propagation of...
article 2004
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