Дисертації з теми "Underwater sea ambient noise"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся з топ-26 дисертацій для дослідження на тему "Underwater sea ambient noise".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Переглядайте дисертації для різних дисциплін та оформлюйте правильно вашу бібліографію.
Codarin, Antonio. "Zonizzazione acustica subacquea del golfo di Trieste: implementazione delle conoscenze tecniche e scientifiche per la valutazione del clima acustico e dei suoi effetti sull'ecosistema marino." Doctoral thesis, Università degli studi di Trieste, 2014. http://hdl.handle.net/10077/10141.
Повний текст джерелаSotto la superficie del mare il suono svolge un ruolo fondamentale nella vita di molti organismi marini, in quanto fornisce una visuale in tre dimensioni dello spazio circostante il singolo individuo, che si estende spesso ben oltre quello fornito dagli altri sensi. L’introduzione da parte dell’uomo di diverse tipologie di rumori in questo ambiente, quindi, desta sempre maggiori preoccupazioni, poiché qualsiasi cosa alteri la capacità di individuare e analizzare il panorama acustico circostante può interferire negativamente con la comunicazione, il comportamento, la fitness e, in termini generali, con la sopravvivenza delle specie. La posizione strategica occupata dal golfo di Trieste, un bacino di acque relativamente poco profonde situato nel Nord Adriatico, unitamente alle caratteristiche geomorfologiche delle sue coste, fanno sì che qui possano svilupparsi molteplici attività che dipendono fortemente dal mare, come quella mercantile, alieutica e diportistica. Considerata la facilità di propagazione dell’onda sonora nell’acqua e tenendo conto che il rumore non conosce “barriere” giurisdizionali, le specie che vivono in esso saranno inevitabilmente sottoposte a pressioni di diversa portata, sia di tipo diffuso che puntuale. Nonostante la Comunità Europea, grazie alla Direttiva 2008/56/CE (Direttiva Quadro per l’ambiente marino, Marine Strategy Framework Directive, MSFD)cerchi di fornire gli strumenti per far fronte a questa preoccupante problematica che insiste sulle risorse marine, si sa ancora molto poco sulla distribuzione spaziale e temporale del rumore antropico subacqueo, sia nel golfo di Trieste che in Italia. Il presente lavoro di ricerca, svolto in collaborazione con l’Agenzia Regionale per la Protezione dell’Ambiente del Friuli Venezia Giulia (ARPA FVG),si è posto il fine di colmare le lacune conoscitive in tale ambito ed ha voluto dare 1) un quadro dettagliato della distribuzione annuale del rumore antropico subacqueo in tutto il golfo di Trieste, 2) individuare, grazie ad esso, in termini spazio-temporali, eventuali aree di “sofferenza acustica” per la fauna marina normalmente presente nell’area e, infine, 3) valutare, tramite l’utilizzo di un modello di propagazione del rumore, le modalità sito-specifiche di propagazione del rumore, simulando scenari a diverse frequenze e in diverse stagioni dell’anno. A tal fine il rumore ambientale subacqueo è stato registrato mensilmente da gennaio a dicembre 2012 in 12 stazioni collocate in posizioni strategiche nel golfo di Trieste, valutando contemporaneamente anche il numero di navi, imbarcazioni e natanti presenti al momento della registrazione. La perdita in trasmissione del suono e stata calcolata utilizzando la Parabolic Equation, risolta col modello di propagazione acustica Miami Monterey Parabolic Equation(MMPE). I risultati evidenziano un’assenza di variabilità tra il clima acustico estivo e quello invernale, con un’intensità media è pari a 125 dB re 1 µPa e con picchi di massima intensità in prossimità del porto di Trieste e della zona al largo di Lignano; le intensità medie delle bande di 1/3 di ottava centrate sui 63 e 125 Hz, invece, sono sempre inferiori ai 100 dB re 1 µPa. A livello spaziale la zona caratterizzata dai va-lori di minore intensità è posizionata nella parte occidentale del golfo. La frequentazione antropica è in gran parte a carico del naviglio mercantile e dei natanti da diporto di piccole dimensioni. Esaminando l’andamento nella stagione estiva e in quella invernale, non è possibile rilevare differenze significative nelle diverse tipologie considerate, fatto che sembra giustificare l’assenza di variazione stagionale del clima acustico. A livello spaziale, nelle tre zone considerate, sia annualmente che d’inverno, si notano differenze significative solo nel numero delle imbarcazioni da pesca. In generale, le grandi navi sono quelle che danno il maggior apporto al rumore ambientale locale. I Gadidae, Clupeiformes e Sciaenidae, nelle zone orientali e centrali del golfo di Trieste, sono gli organismi sottoposti al maggior superamento, da parte del rumore di fondo, della rispettiva soglia acustica. Le differenze maggiori si riscontrano per lo più tra i 200 ed i 300 Hz circa, dove si colloca la maggior sensibilità uditiva di molte specie. Proprio in questo range di frequenze il modello MMPE indica la minima perdita in propagazione dell’onda sonora, che può raggiungere anche i 20 km di distanza dalla sorgente. Il modello ha permesso di evidenziare, quindi, che nelle vicinanze di forti sorgenti di rumore potrebbero aver luogo reazioni di tipo comportamentale e, che, per avere quadro più esaustivo, sarebbe consigliato monitorare altre frequenze oltre alle 63 e 125 Hz attualmente proposte. I risultati di questa ricerca, prima in Adriatico su scala spazio-temporale così ampia, hanno fornito una dettagliata analisi delle pressioni, dei potenziali impatti predominanti nell’area e delle condizioni di clima acustico in cui versa il golfo di Trieste. Per rispondere alle richieste della MSFD, i valori di intensità rilevati non possono escludere che siano a livelli tali da non avere effetti negativi sull’ambiente marino: possono verificarsi, infatti, effetti di tipo fisiologico-stressorio a livello del singolo organismo, e di interferenza nella comunicazione nelle specie che utilizzano il suono come strumento di trasferimento di informazione intra e interspecifico. Si ritiene che i valori di riferimento proposti in questo lavoro, in un’ottica precauzionale, siano un valido contributo iniziale per la determinazione dello stato ecologico dell’area. L’attuale prosecuzione dell’attività di monitoraggio del rumore sottomarino condotta da ARPA FVG, da affiancare in futuro a sistemi di acquisizione in continuo ed all’analisi di altre componenti del fenomeno acustico, quali il movimento delle particelle, permetterà sicuramente di ampliare, unitamente ad un confronto con le realtà transfrontaliere, le conoscenze sul rumore antropico. Ciò permetterà di regolamentare, anche da un punto di vista giuridico, l’introduzione del suono sotto la superficie del mare e di raggiungere gli obiettivi della MSFD previsti entro il 2020.
Under the sea surface sound plays a vital role for many marine organisms, as it provides a visual three-dimensional space surrounding the individual, which is often extends beyond that provided by other senses. Introduction by humans of different types of noise in this environment, therefore, affects the ability to identify and analyze the landscape surrounding noise may cause harmful interference with communication, behavior, fitness and, in general terms, with the species’ survival. The strategic position of Trieste Gulf, a shallow water coastal zone located inthe Northern Adriatic Sea, together with the geomorphological characteristics of its coasts, can develop a variety of activities that are highly dependent on the sea, like the merchant , fishing and pleasure boating. Given the ease of propagation of the sound wave in the water and taking into account that the noise does not know jurisdictionalbarriers, the species that live in it will inevitably be subjected to pressures of different scales ,both of which diffuse on time. Despite the European Union, thanks to 2008/56/EC Marine Strategy Framework Directive (MSFD ) seeks to provide the tools to cope with this troubling issue that insists on marine resources , is not yet known very little about the spatial and temporal distribution of anthropogenic underwater noise , both in the Gulf of Trieste in Italy. This research work was performed in collaboration with the Regional Agency for Environmental Protection of Friuli Venezia Giulia (ARPA FVG), place the order to fill gaps in knowledge in this area and wanted to give 1 ) a framework detailed annual distribution of background underwater noise in the Gulf of Trieste , 2 ) to identify, thanks to it, in terms of space and time, any areas of suffering acoustic for marine life normally present in the area and, finally,3 ) to assess, through the use of a model of noise propagation, the site-specific mode of propagation of noise, simulating scenarios at different frequencies and in different seasons of the year. Underwater ambient noise was recorded monthly from January to December 2012 at 12 stations placed at strategic locations in the Gulf of Trieste; at the same time total amount of ships, boats and vessels present at the time of registration were counted. Transmission loss was calculated using the Parabolic Equation, solved with the model of acoustic propagation Monterey Miami Parabolic Equation (MMPE). Results show an absence of the noise climate variability between summer and winter, with an average intensity level equals to 125 dB re 1 Pa and a maximum in the vicinity of the port of Trieste and the area off the coast of Lignano; the average intensities of the bands in 1/3 octave band centered on 63 and 125 Hz, however, are always less than 100 dB re 1 Pa. A spatially area characterized by the values of lower intensity is located in the western part of the Gulf. The attendance is largely anthropogenic load of merchant ships and small recreational boat. Looking at the summer and winter trend, it is not possible to detect significant differences in the various types considered, which seems to justify the absence of seasonal variation of the noise climate. In terms of space, in the three areas considered, both annual and winter, significant differences are noted only in the number of fishing vessels. In general, large ships are the ones that make the greatest contribution to local environmental noise. The Gadidae, Clupeiformes and Sciaenidae, in the eastern and central parts of the Gulf of Trieste, are the organisms subjected to the most overrun by the background noise of the respective acoustic threshold. The largest differences are found mostly between about 200 and 300 Hz, where does the greater auditory sensitivity of many species. In this frequency range MMPE model indicates minimal loss in sound propagation, which can reach up to 20 km away from the source. The model has allowed to show, therefore, that in the vicinity of strong noise sources could take place, and behavioral reactions, which, in order to have more complete picture, it would be advisable to monitor other frequencies in addition to the 63 and 125 Hz currently proposed. The results of this research, first in the Adriatic Sea onspatio-temporal scale so large, they have provided a detailed analysis of the pressures, the potential impacts of the conditions prevailing in the area and of the acoustic climate prevailing in the Gulf of Trieste. To meet the requirements of the MSFD, the intensity values measured cannot rule out that they are at levels that do not have adverse effects on the marine environment can occur, in fact, the effects of physiological stressorio - level of the individual organism, and interference in communication in species that use sound as a tool for intra-and interspecies transfer of information. It is believed that the reference values proposed in this work, from a precautionary measure, are a valuable contribution to the initial determination of the ecological status of the area. The current continuation of the monitoring of the underwater noise conducted by ARPA FVG, alongside in future systems of continuous acquisition and analysis of other components of the acoustic phenomenon, such as the movement of particles, will certainly broaden , together with a comparison with the realities of cross border knowledge about man-made noise. This will allow you to regulate, even from a legal point of view, the introduction of sound in the sea surface and to achieve the objectives of the MSFD expected by 2020.
XXVI Ciclo
1978
Andronis, Nicholas. "Reliable Long-Range and High Ambient Noise Underwater Communication." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/76485.
Повний текст джерелаEpifanio, Chad Lawrence. "Acoustic daylight : passive acoustic imaging using ambient noise /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823704.
Повний текст джерелаAlMuhanna, Khalid A. "Acoustic modeshape inversion using deep water ambient noise measurements." Fairfax, VA : George Mason University, 2008. http://hdl.handle.net/1920/3214.
Повний текст джерелаVita: p. 69. Thesis director: Kathleen E. Wage. Submitted in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering. Title from PDF t.p. (viewed Aug. 27, 2008). Includes bibliographical references (p. 67-68). Also issued in print.
Leroy, Charlotte. "Using ocean ambient noise cross-correlations for passive acoustic tomography." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39636.
Повний текст джерелаLi, Zizheng. "Vertical Noise Structure and Target Detection Performance in Deep Ocean Environments." PDXScholar, 2010. https://pdxscholar.library.pdx.edu/open_access_etds/138.
Повний текст джерелаHipsey, Stephen J. "Ambient noise due to the shearing of the boundary layer under sea ice." Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/22869.
Повний текст джерелаMuzi, Lanfranco. "Advances in Autonomous-Underwater-Vehicle Based Passive Bottom-Loss Estimation by Processing of Marine Ambient Noise." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2612.
Повний текст джерелаSabey, Lindsay Erin. "Body and surface wave ambient noise seismic interferometry across the Salton Sea Geothermal Field, California." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/51185.
Повний текст джерелаMaster of Science
Soars, Natalie Anne. "Habitat soundscapes and sound production by tropical and temperate sea urchins and the swimming behaviour of their larvae." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13923.
Повний текст джерелаChen, Feng. "Effect of mesoscale variability of water masses on acoustic wave propagation in a shallow sea." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3219.
Повний текст джерелаSnyder, Mark Alan. "Long-Term Ambient Noise Statistics in the Gulf of Mexico." ScholarWorks@UNO, 2007. http://scholarworks.uno.edu/td/595.
Повний текст джерелаRovinelli, Giulia <1998>. "Analyses of the fishing effort and of the underwater noise for a sustainable exploitation of the northern Adriatic Sea." Master's Degree Thesis, Università Ca' Foscari Venezia, 2022. http://hdl.handle.net/10579/21879.
Повний текст джерелаO'Neal, Daniel Matthew. "Comparison of the underwater ambient noise measured in three large exhibits at the Monterey Bay Aquarium and in the inner Monterey Bay." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA350428.
Повний текст джерелаTsai, Hung-Ju, and 蔡鴻儒. "Estimation and Analysis of the Underwater Noise during Construction and Measurement of Underwater Ambient Noise in the West Coast of Taiwan." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68355317513481143741.
Повний текст джерела國立臺灣大學
工程科學及海洋工程學研究所
101
Today, wind-generated electricity is one of the success green energy in the world. The potential for developing wind energy in the ocean is huge. Absolutely, Taiwan has good condition in developing wind energy. The west ocean of Taiwan is the sites of offshore wind farm. At the same time, this plant also contains lots marine mammals. Therefore, we are easy to neglect the problem between the environment and construction and operation of the offshore wind farm. This research have two parts. The first part is direct to the underwater noise during the construction of the wind farm. And use the construction report of Alpha Ventus in Germany and the historical data of hydrological and terrain to imitate the spreading range and impact range of underwater noise arising from the construction of offshore wind farm. Second part is measurement of the underwater ambient noise. Laying the hydrophone on the sea-bed and measuring the long term ambient noise. To analysis the seasonal variability and the characteristics of the local underwater ambient noise.
Liu, Chih-Sheng, and 劉志昇. "An Analysis of Low Frequency Ambient Noise in South China Sea." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/85430328628405628375.
Повний текст джерела國立中山大學
海下技術研究所
91
The study is based upon the Vertical Line Array (VLA) of the Asian Seas International Acoustic Experiment (ASIAEX), dated from May 3, 2001 to May 16, 2001, in which the ambient noise was measured and the six frequencies (including 50, 100, 200, 400, 800, 1,200 Hz) were analyzed. The depth dependence of ambient noise levels in shallow water is not significant, and the fluctuations of ambient noise levels can be measured by Fourier analysis. With the similar analysis on static water pressure and temperature variation, the acoustic data has shown obvious in K1 and M2 tidal periods. The frequency dependence of ambient noise was also investigated, the lower frequency components, 50, 100, and 200 Hz, were mainly contributed from distant shipping noise, and the local wind was the dominating factor in higher frequencies such as 400, 800, and 1,200 Hz. This result was further verified by the increased levels at higher frequency due to the typhoon Cimaron during the experiment. Finally, the probability distribution function of ambient noise levels was calculated at each frequency, and was found the lower frequency ambient noise levels were not significantly affected by the typhoon as higher frequency. The threshold frequency of the ambient noise levels affected by the wind wave is about 400 Hz.
Tsai, Chung-Ting, and 蔡忠廷. "Ambient Noise Analysis in Shallow Water at Southwestern Sea of Taiwan." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/3t5e34.
Повний текст джерела國立中山大學
海下技術研究所
96
Sound wave has much better transmission in ocean environment than electromagnetic waves, therefore sonar systems are widely applied in underwater investigations. However, not only the target signal is received by the sonar but also the noise from different directions. The noise will affect the performance of the sonar, so the understanding of ocean ambient is an important issue both in academic study and military applications. The ambient noise data of this research was collected by a passive acoustic recording system deployed in the southwest sea of Taiwan, along with the information of wind velocity in the experimented area. The influence on noise level fluctuations by the variation of the wind velocity was first discussed in light of correlation analysis. The fluctuations were expressed in terms of statistic distribution, mean value, standard deviation in different time series. As results, 500 Hz and 1.5k Hz were saturated by high levels signal from unknown sources in spring and summer, so the average sound levels were higher than in fall and winter, about 10 dB and 5 dB higher for 500 Hz and 1.5k Hz respectively. In seasonal analysis, 2.4k and 3.6k Hz have quite stable the mean levels and their standard deviations were around 3 dB. Especially, the noise level of 3.6 Hz has the least fluctuation throughout the year than any other frequencies analyzed. It was also observed that the noise level was decreased with the increase of frequency. Calculated by linear regression, this research worked out the estimation equation for the ambient noise level at high wind speed. However, the estimated values are higher than the measured data, it is due to the distribution of wind velocity. The wind data in this study was skewed towards the lower velocity, consequently the predicted values were overestimated.
Dall'Osto, David R. "A study of the spectral and directional properties of ambient noise in Pugent Sound /." Thesis, 2009. http://nsgl.gso.uri.edu/washu/washuy09004.pdf.
Повний текст джерелаDall'Osto, David R. "A study of the spectral and directional properties of ambient noise in Puget Sound." 2009. http://nsgl.gso.uri.edu/washu/washuy09004.pdf.
Повний текст джерелаPeng, TsengHong, and 彭增洪. "Asian Seas International Acoustic Experiment--Ambient Noise Study in South China Sea." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/10331134591811689271.
Повний текст джерелаRocha, Adriana Andrade Sousa. "Underwater noise propagation models and its application in renewable energy parks: WaveRoller Case Study." Master's thesis, 2016. http://hdl.handle.net/10362/20039.
Повний текст джерелаChang, Wei-Hang, and 張偉涵. "Correlation Study of Rainfall Intensity and Ocean Ambient Noise of Northeastern Taiwan Sea." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/93230416034485184349.
Повний текст джерела國立中山大學
海下科技暨應用海洋物理研究所
101
The ocean ambient noise is one of the important parameters in sonar equation. The ocean ambient noise includes diverse and complex sources like waves, rain, marine life, ships, and etc. Using different ways to analyze are needed to understand the complicated properties of ambient noise. According to the data of Central Weather Bureau, northeastern Taiwan is the area with most rainfall in Taiwan. Among all kinds of ambient noise, rain-generated noise is wide in frequency range, if we know more about the rain-generated noise at sea, we can predict the effect of rainfall on underwater communication and survey. In this article, the ambient noise data were collected from MACHO(Marine Cable Hosted Observatory)system at northeastern sea of Taiwan in 2011 and 2012. Applying corresponding rainfall intensity data to observed noise level time series, observed ambient noise characteristic of each frquencies. Correlation analysis between rainfall intensity and underwater noise was performed, so the rain-generated noise level can be predicted by linear regression. The ocean ambient noise still has variations due to time and variance of sound sources, so it is important to be investigated. This study compares the statistical properties and distribution of ambient noise level at different frequencies and rainfall intensities, and also seasonal variation were discussed. Speculated the reasons for these differences, this can be the information of ambient noise analysis.
Lin, Po-Chang, and 林柏滄. "Vertical Directionality Analysis of Low Frequency Ambient Noise in South China Sea Experiment of ASIAEX." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/68004112398579752157.
Повний текст джерела國立中山大學
海下技術研究所
92
This study is based upon the vertical line array (VLA) in South China Sea experiment of the Asian Seas International Acoustic Experiment (ASIAEX), dated from May 3, 2001 to May 16, 2001, in which the ambient noise in shallow water was measured. In this paper, we use the beamforming method to calculate the vertical directionality of ambient noise in shallow water, for discussing the noise source distribution, and environmental effects on vertical directionality. The results show that distant shipping noise was observed near the horizontal angles, and surface noise occurred at high grazing angles. It is also discussed that the wind speed effect on the vertical directionality in this paper. Because of the typhoon Cimaron passed the experimental area during the experiment, which make wind speed changed obviously, so it can be found out the wind effect of ambient noise. By analyze the noise fluctuation, it is concluded that the threshold frequency of wind wave affected ambient noise levels were about 400 Hz. And after analyzing the vertical directionality, it is verified that the threshold was lower to 200 Hz. On the other hand, we also note the phenomena of “noise notch” appeared at some duration when calculating the vertical directionality. The environmental effects (sound speed profile) on the notch, and the presentation of noise notch at different frequencies were discussed. In the end part of this paper, we determined the time when the notch occurred by using the power difference of vertical directionality, and we expect that the results would be important for similar researches in the future.
Lindseth, Adelaide Virginia. "Determining temporal recording schemes for underwater acoustic monitoring studies." Thesis, 2019. https://hdl.handle.net/2144/34796.
Повний текст джерелаBiggs, Kristian Pedersen. "Spatial variability of the ambient noise field associated with the Marginal Ice Zone and its relationship to environmental parameters." Thesis, 1988. http://hdl.handle.net/10945/23402.
Повний текст джерелаDuring the month of July 1987 an acoustical experiment was conducted by the United States Naval Research Laboratory (NRL) in the East Greenland Sea Marginal Ice Zone (MIZ) . Ambient noise "hot spots" or concentrated areas of relatively high noise levels were found along the ice edge using a towed array. Ambient noise levels were obtained on 27 and 28 July using AN/SSQ-57A and AN/SSQ-57XN5 calibrated sonobuoys . The temperature structure of the area was determined using XBT (ship) and AXBT (P3C aircraft) buoys placed inside and outside the ice edge. The ice edge was determined from coincident satellite photos, 90 GHz microwave imagery and P3 radar ice edge maps. Weather data (sea state and wind speed and direction) were recorded on the ship. The data seem to indicate a correlation between the high ambient noise levels of the hot spots and the presence of a large topographically controlled mesoscale eddy located at the southeastern extent of the MIZ.
http://archive.org/details/spatialvariabili00bigg
Lieutenant, United States Navy
Krishna, Kumar G. V. "Characterization of Flow Induced Noise Received by an Array Placed at Stagnation Point of an Underwater Axisymmetric Body." Thesis, 2017. http://etd.iisc.ernet.in/2005/3799.
Повний текст джерела