Multifrequency acoustic target strength of Northern krill
Although this thesis is a dissertation based on articles, an exhaustive overview on the main issues involved is also presented *. This is due to the necessity to summarize the numerous aspects of the problem, as well as the recent works on specific topics and the innovative elements presented in thi...
Main Author: | |
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
The University of Bergen
2009
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Subjects: | |
Online Access: | https://hdl.handle.net/1956/3885 |
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ftunivbergen:oai:bora.uib.no:1956/3885 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Underwater acoustics Abundance estimation VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 VDP::Teknologi: 500::Marin teknologi: 580::Annen marin teknologi: 589 |
spellingShingle |
Underwater acoustics Abundance estimation VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 VDP::Teknologi: 500::Marin teknologi: 580::Annen marin teknologi: 589 Calise, Lucio Multifrequency acoustic target strength of Northern krill |
topic_facet |
Underwater acoustics Abundance estimation VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 VDP::Teknologi: 500::Marin teknologi: 580::Annen marin teknologi: 589 |
description |
Although this thesis is a dissertation based on articles, an exhaustive overview on the main issues involved is also presented *. This is due to the necessity to summarize the numerous aspects of the problem, as well as the recent works on specific topics and the innovative elements presented in this work of thesis. In some of its parts, it may appear repetitive due to the treatment of the specific topic. The contents of the papers included in the thesis are referred when the related issue is treated. With the intent to provide a useful guide to the reader, a large effort has also been undertaken to select and indicate specific bibliographic references. The first chapter describes the background on the acoustic estimation method by using scientific echosounders for zooplankton in general. Then, the specific techniques adopted for identification of krill by using both theoretical and empirical approaches are introduced. The chapter starts with the description of the order Euphausiacea, focusing on its main biological characteristics related to the analysis of the acoustic data. An introduction on the Antarctic krill fishery in Southern Pole areas is also given In Chapter 2, the theoretical approach on target strength of krill and the key parameters for the modelling are resumed. The krill orientation problem is discussed with reference to the main studies in estimating mean angle and standard deviation of a normal distribution of euphausiids orientation. Paragraph 2.3 explores the methods for the evaluation of the key model parameters being the background for the Papers I. The last Section 2.4 describes in details the distorted wave Born approximation model in its various forms. This is recognized as the state-of-the-art in the physics-based models predicting target strength of fluid-like crustacean zooplankton, and deserved a detailed desciption, being also an object of Paper V. Chapter 3 represents a central point of the entire thesis. Ex situ direct acoustic measurements on Northern krill Meganyctiphanes ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Calise, Lucio |
author_facet |
Calise, Lucio |
author_sort |
Calise, Lucio |
title |
Multifrequency acoustic target strength of Northern krill |
title_short |
Multifrequency acoustic target strength of Northern krill |
title_full |
Multifrequency acoustic target strength of Northern krill |
title_fullStr |
Multifrequency acoustic target strength of Northern krill |
title_full_unstemmed |
Multifrequency acoustic target strength of Northern krill |
title_sort |
multifrequency acoustic target strength of northern krill |
publisher |
The University of Bergen |
publishDate |
2009 |
url |
https://hdl.handle.net/1956/3885 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Northern krill |
genre_facet |
Antarc* Antarctic Antarctic Krill Northern krill |
op_relation |
Paper I: Lucio Calise, Tohru Mukai and Tor Knutsen, (2009), Density and speed of sound in winter specimens of Northern krill (Meganyctiphanes norvegica) from a west Norwegian fjord. Draft. To be submitted to ICES Journal of Marine Science. Paper II: Lucio Calise, Tor Knutsen and Webjørn Melle, (2005), Multifrequency Acoustic Measurements of free swimming northern krill (Meganyctiphanes norvegica) in a mesocosm venue: methodological challenges. Draft. Proceedings of the International Conference “Underwater Acoustic measurements: Technologies & Results”, Vol. II, pages 865-871, Heraklion, Crete, Greece, 28th June – 1st July 2005. Paper III: Lucio Calise, (2009), Short range performances of a scientific echosounder with emphasis on accurate calibration. Draft. To be submitted to Journal of the Acoustical Society of America. Paper IV: Lucio Calise, Tor Knutsen and Webjørn Melle, (2009), Multifrequency target strength of horizontally free-swimming Northern krill (Meganyctiphanes norvegica) in a mesocosm venue. Draft. To be submitted to ICES Journal of Marine Science. Paper V: Lucio Calise and Tor Knutsen, (2009) Multifrequency target strength of Northern krill (Meganyctiphanes norvegica): measurements on tethered specimens and SDWBA theoretical predictions. Draft. To be submitted to ICES Journal of Marine Science Paper VI: Lucio Calise, Tor Knutsen and Rolf Korneliussen, (2007), The impact of echo sounder settings for the discrimination of acoustic scatterers in a multi-frequency survey context. Draft. Proceedings of the 2nd International Conference “Underwater Acoustic Measurements: Technologies & Results”, Vol. III, pages 1201-1208, Heraklion, Crete, Greece, 25th -29th June 2007. urn:isbn:978-82-308-0768-2 (print version) https://hdl.handle.net/1956/3885 |
op_rights |
The Author Copyright the author. All rights reserved |
_version_ |
1766199733061156864 |
spelling |
ftunivbergen:oai:bora.uib.no:1956/3885 2023-05-15T13:44:17+02:00 Multifrequency acoustic target strength of Northern krill Calise, Lucio 2009-03-30 application/pdf https://hdl.handle.net/1956/3885 eng eng The University of Bergen Paper I: Lucio Calise, Tohru Mukai and Tor Knutsen, (2009), Density and speed of sound in winter specimens of Northern krill (Meganyctiphanes norvegica) from a west Norwegian fjord. Draft. To be submitted to ICES Journal of Marine Science. Paper II: Lucio Calise, Tor Knutsen and Webjørn Melle, (2005), Multifrequency Acoustic Measurements of free swimming northern krill (Meganyctiphanes norvegica) in a mesocosm venue: methodological challenges. Draft. Proceedings of the International Conference “Underwater Acoustic measurements: Technologies & Results”, Vol. II, pages 865-871, Heraklion, Crete, Greece, 28th June – 1st July 2005. Paper III: Lucio Calise, (2009), Short range performances of a scientific echosounder with emphasis on accurate calibration. Draft. To be submitted to Journal of the Acoustical Society of America. Paper IV: Lucio Calise, Tor Knutsen and Webjørn Melle, (2009), Multifrequency target strength of horizontally free-swimming Northern krill (Meganyctiphanes norvegica) in a mesocosm venue. Draft. To be submitted to ICES Journal of Marine Science. Paper V: Lucio Calise and Tor Knutsen, (2009) Multifrequency target strength of Northern krill (Meganyctiphanes norvegica): measurements on tethered specimens and SDWBA theoretical predictions. Draft. To be submitted to ICES Journal of Marine Science Paper VI: Lucio Calise, Tor Knutsen and Rolf Korneliussen, (2007), The impact of echo sounder settings for the discrimination of acoustic scatterers in a multi-frequency survey context. Draft. Proceedings of the 2nd International Conference “Underwater Acoustic Measurements: Technologies & Results”, Vol. III, pages 1201-1208, Heraklion, Crete, Greece, 25th -29th June 2007. urn:isbn:978-82-308-0768-2 (print version) https://hdl.handle.net/1956/3885 The Author Copyright the author. All rights reserved Underwater acoustics Abundance estimation VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430 VDP::Teknologi: 500::Marin teknologi: 580::Annen marin teknologi: 589 Doctoral thesis 2009 ftunivbergen 2023-03-14T17:44:45Z Although this thesis is a dissertation based on articles, an exhaustive overview on the main issues involved is also presented *. This is due to the necessity to summarize the numerous aspects of the problem, as well as the recent works on specific topics and the innovative elements presented in this work of thesis. In some of its parts, it may appear repetitive due to the treatment of the specific topic. The contents of the papers included in the thesis are referred when the related issue is treated. With the intent to provide a useful guide to the reader, a large effort has also been undertaken to select and indicate specific bibliographic references. The first chapter describes the background on the acoustic estimation method by using scientific echosounders for zooplankton in general. Then, the specific techniques adopted for identification of krill by using both theoretical and empirical approaches are introduced. The chapter starts with the description of the order Euphausiacea, focusing on its main biological characteristics related to the analysis of the acoustic data. An introduction on the Antarctic krill fishery in Southern Pole areas is also given In Chapter 2, the theoretical approach on target strength of krill and the key parameters for the modelling are resumed. The krill orientation problem is discussed with reference to the main studies in estimating mean angle and standard deviation of a normal distribution of euphausiids orientation. Paragraph 2.3 explores the methods for the evaluation of the key model parameters being the background for the Papers I. The last Section 2.4 describes in details the distorted wave Born approximation model in its various forms. This is recognized as the state-of-the-art in the physics-based models predicting target strength of fluid-like crustacean zooplankton, and deserved a detailed desciption, being also an object of Paper V. Chapter 3 represents a central point of the entire thesis. Ex situ direct acoustic measurements on Northern krill Meganyctiphanes ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctic Krill Northern krill University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic The Antarctic |