Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603659
Rikito Hisamatsu, S. Tabeta
In order to assess the effect of environmental restoration plans for a small scale beach called Heda-Mihama, simulation-based habitat evaluation approach is employed. A three-dimensional hydrodynamic model is developed by using the measured topography to reproduce the characteristics of currents around Heda-Mihama. A sediment transport model is also developed to predict the distribution and change of sediment size at the target site. For the assessment of the ecological value of the site, HEP (Habitat Evaluation Procedure) is employed, in which one of the typical species of bivalves is chosen as a target species. Water depth, sediment size, bottom friction velocity are chosen as the environmental factors for the target species. The suitable indices (SI) for each environmental factors are calculated by using the results of hydrodynamic and sediment transport simulations. By using the developed scheme, habitat values are evaluated for the proposed restoration plans and compared to the current values. It is predicted that the removal of the piers will significantly increase the habitat value of the target site. It is because the water current is significantly increased which make the sediment size larger as well as promote the water exchange at the site.
{"title":"Assessment of environmental restoration plans for a small-scale beach by simulation-based habitat evaluation","authors":"Rikito Hisamatsu, S. Tabeta","doi":"10.1109/OCEANSSYD.2010.5603659","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603659","url":null,"abstract":"In order to assess the effect of environmental restoration plans for a small scale beach called Heda-Mihama, simulation-based habitat evaluation approach is employed. A three-dimensional hydrodynamic model is developed by using the measured topography to reproduce the characteristics of currents around Heda-Mihama. A sediment transport model is also developed to predict the distribution and change of sediment size at the target site. For the assessment of the ecological value of the site, HEP (Habitat Evaluation Procedure) is employed, in which one of the typical species of bivalves is chosen as a target species. Water depth, sediment size, bottom friction velocity are chosen as the environmental factors for the target species. The suitable indices (SI) for each environmental factors are calculated by using the results of hydrodynamic and sediment transport simulations. By using the developed scheme, habitat values are evaluated for the proposed restoration plans and compared to the current values. It is predicted that the removal of the piers will significantly increase the habitat value of the target site. It is because the water current is significantly increased which make the sediment size larger as well as promote the water exchange at the site.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124016768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603883
N. Cruz, A. Matos
The thermocline is a vertical transition layer in the water column with a strong impact on marine biology, since it affects phytoplankton concentration and, hence, primary production. AUVs can play an important role in understanding this relationship, by sampling the relevant data, usually describing yo-yo patterns spanning the whole water column. In this paper we describe a reactive behavior implemented onboard a small sized AUV, to adapt depth in real time in order to maintain the vehicle in the vicinity of the thermocline and therefore increasing efficiency in the sampling process. Preliminary field tests show that the method is simple, robust and effective.
{"title":"Reactive AUV motion for thermocline tracking","authors":"N. Cruz, A. Matos","doi":"10.1109/OCEANSSYD.2010.5603883","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603883","url":null,"abstract":"The thermocline is a vertical transition layer in the water column with a strong impact on marine biology, since it affects phytoplankton concentration and, hence, primary production. AUVs can play an important role in understanding this relationship, by sampling the relevant data, usually describing yo-yo patterns spanning the whole water column. In this paper we describe a reactive behavior implemented onboard a small sized AUV, to adapt depth in real time in order to maintain the vehicle in the vicinity of the thermocline and therefore increasing efficiency in the sampling process. Preliminary field tests show that the method is simple, robust and effective.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122269009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603570
J. R. Exelby, H. Vu
The underwater environment is often complex and highly variable in space and time, making it difficult to model the detection performance of anti-submarine warfare (ASW) sonar systems. Furthermore, the environment can result in complex active sonar data displays that are difficult to interpret. The performance of the sonar system can be enhanced by understanding and exploiting knowledge about the underwater environment. This paper illustrates how relevant and timely environmental data from the BLUElink ocean model can be used to improve sonar performance modelling and assist the sonar operator interpret complex sonar data displays.
{"title":"Improving anti-submarine warfare sonar performance modelling using BLUElink forecast environmental data","authors":"J. R. Exelby, H. Vu","doi":"10.1109/OCEANSSYD.2010.5603570","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603570","url":null,"abstract":"The underwater environment is often complex and highly variable in space and time, making it difficult to model the detection performance of anti-submarine warfare (ASW) sonar systems. Furthermore, the environment can result in complex active sonar data displays that are difficult to interpret. The performance of the sonar system can be enhanced by understanding and exploiting knowledge about the underwater environment. This paper illustrates how relevant and timely environmental data from the BLUElink ocean model can be used to improve sonar performance modelling and assist the sonar operator interpret complex sonar data displays.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127903530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603592
Xiubin Qi, Emma Crooke, A. Ross
Hydrocarbon seeps in the marine environment are used as proxies for subsurface accumulations. Typically marine surveys to delineate these subsea features us a verity of techniques, which generally do not allow timely chemical identification of hydrocarbons. This paper outlines current research on the development of an integrated underway arrayed hydrocarbon sensing system that can be used on a variety of vessels to detect seeped hydrocarbons. The aim of the research is to increase the number of successful surveys through the deployment of this equipment. Field trials of the system have demonstrated its successful operation in the marine environment and testing of the hydrocarbon sensors have shown that the majority of the sensors used can detect dissolved hydrocarbons at ppb levels. Laboratory experiments using 23 oil-in-synthetic sea water extracts has shown that the sensor array has the potential to differentiate between oils (refined and unrefined) from different sources, based upon their seawater extracts.
{"title":"Development of an arrayed hydrocarbon sensing system for the detection of seeped hydrocarbons","authors":"Xiubin Qi, Emma Crooke, A. Ross","doi":"10.1109/OCEANSSYD.2010.5603592","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603592","url":null,"abstract":"Hydrocarbon seeps in the marine environment are used as proxies for subsurface accumulations. Typically marine surveys to delineate these subsea features us a verity of techniques, which generally do not allow timely chemical identification of hydrocarbons. This paper outlines current research on the development of an integrated underway arrayed hydrocarbon sensing system that can be used on a variety of vessels to detect seeped hydrocarbons. The aim of the research is to increase the number of successful surveys through the deployment of this equipment. Field trials of the system have demonstrated its successful operation in the marine environment and testing of the hydrocarbon sensors have shown that the majority of the sensors used can detect dissolved hydrocarbons at ppb levels. Laboratory experiments using 23 oil-in-synthetic sea water extracts has shown that the sensor array has the potential to differentiate between oils (refined and unrefined) from different sources, based upon their seawater extracts.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129890208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603872
M. Heron, P. Marrone
A direct measure from the spectra of HF radar sea echoes is the ratio of energy in the dominant Bragg peaks. If a single lobe is assumed for the directionality then two radar stations can be used to provide a closed solution for the direction of the lobe. In this work we examine the potential of using just one radar station to derive directional information about wind fields. It is shown that HF radar Bragg ratios are effective in providing timing and location information for features appearing on Mean Sea Level synoptic charts.
{"title":"Wind direction manifestation on HF ocean radar echoes","authors":"M. Heron, P. Marrone","doi":"10.1109/OCEANSSYD.2010.5603872","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603872","url":null,"abstract":"A direct measure from the spectra of HF radar sea echoes is the ratio of energy in the dominant Bragg peaks. If a single lobe is assumed for the directionality then two radar stations can be used to provide a closed solution for the direction of the lobe. In this work we examine the potential of using just one radar station to derive directional information about wind fields. It is shown that HF radar Bragg ratios are effective in providing timing and location information for features appearing on Mean Sea Level synoptic charts.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130950270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603674
Jian Cui, N. Kouguchi, A. Ikawa, S. Okuda, Y. Arai
It is well known that an observation of the long period gravity wave is very difficult to observe for its long period and small amplitude. In our recent research, an integrated wave remote sensing system utilizing multi-path GPS signals reflected from sea surface is proposed to measure accurate wavelength for long period gravity wave. The system is equipped with an arrayed GPS antenna that has a narrow fan beam directional pattern. It has a better performance to measure accurate wavelength than wide beam antenna in numerical simulation and it can acquire multi-path GPS signal reflected from specified sea surface in seaside experiments. In digital GPS signal processing, software GPS receiver is applied to estimate the relative time delays between multi-path GPS signals. In this paper, simulation results and seaside experiment results obtained by the wave remote sensing system are also presented.
{"title":"Wave remote sensing system by GPS","authors":"Jian Cui, N. Kouguchi, A. Ikawa, S. Okuda, Y. Arai","doi":"10.1109/OCEANSSYD.2010.5603674","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603674","url":null,"abstract":"It is well known that an observation of the long period gravity wave is very difficult to observe for its long period and small amplitude. In our recent research, an integrated wave remote sensing system utilizing multi-path GPS signals reflected from sea surface is proposed to measure accurate wavelength for long period gravity wave. The system is equipped with an arrayed GPS antenna that has a narrow fan beam directional pattern. It has a better performance to measure accurate wavelength than wide beam antenna in numerical simulation and it can acquire multi-path GPS signal reflected from specified sea surface in seaside experiments. In digital GPS signal processing, software GPS receiver is applied to estimate the relative time delays between multi-path GPS signals. In this paper, simulation results and seaside experiment results obtained by the wave remote sensing system are also presented.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130990059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603585
J. Young, S. Keenan, D. Clark, P. Sullivan, S. Billings
We are developing a magnetic tensor gradiometer for underwater unexploded ordnance (UXO) detection using high-Tc SQUID planar gradiometers. The system will use signals from six planar gradiometers, located on the faces of a hexagonal pyramid, to calculate the full gradient tensor. It will be towed underwater and will need to deal with noise caused by ocean waves, sensor motion and the measurement capsule itself. This paper presents our progress to date on this project including test results of gradiometer performance in laboratory conditions.
{"title":"Development of a high temperature superconducting magnetic tensor gradiometer for underwater UXO detection","authors":"J. Young, S. Keenan, D. Clark, P. Sullivan, S. Billings","doi":"10.1109/OCEANSSYD.2010.5603585","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603585","url":null,"abstract":"We are developing a magnetic tensor gradiometer for underwater unexploded ordnance (UXO) detection using high-Tc SQUID planar gradiometers. The system will use signals from six planar gradiometers, located on the faces of a hexagonal pyramid, to calculate the full gradient tensor. It will be towed underwater and will need to deal with noise caused by ocean waves, sensor motion and the measurement capsule itself. This paper presents our progress to date on this project including test results of gradiometer performance in laboratory conditions.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129613253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603850
M. Sangekar, B. Thornton, T. Nakatani, T. Ura
The autonomous underwater vehicle has proven to be a useful tool for ocean research. However detailed seafloor observations such as microscopic analysis of sand grain structure or study of microbial colonies require a platform with stable footing on the seafloor, which cannot be provided by a cruising type AUV. In this research the authors propose a new class of AUV, capable of landing to provide a stable, but mobile, platform with which to perform these observations. This paper proposes a sensing system and a software algorithm to enable the AUVs to perform landing. A light sectioning based method is used to scan the seafloor with high resolution. Since the seafloor can change abruptly and at short intervals, the reliability and functioning of such technology requires real-time seafloor classification and detection of suitable landing sites. A landing algorithm has been developed which uses three dimensional bathymetry data and calculates a landing vector coordinate in real-time. A microscope sensor payload developed to obtain magnified images of the seafloor after landing has also been tested. Data from sea experiments are presented, where the algorithm demonstrated real-time generation of landing vector coordinates for an ROV.
{"title":"Development of a landing algorithm for autonomous underwater vehicles using laser profiling","authors":"M. Sangekar, B. Thornton, T. Nakatani, T. Ura","doi":"10.1109/OCEANSSYD.2010.5603850","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603850","url":null,"abstract":"The autonomous underwater vehicle has proven to be a useful tool for ocean research. However detailed seafloor observations such as microscopic analysis of sand grain structure or study of microbial colonies require a platform with stable footing on the seafloor, which cannot be provided by a cruising type AUV. In this research the authors propose a new class of AUV, capable of landing to provide a stable, but mobile, platform with which to perform these observations. This paper proposes a sensing system and a software algorithm to enable the AUVs to perform landing. A light sectioning based method is used to scan the seafloor with high resolution. Since the seafloor can change abruptly and at short intervals, the reliability and functioning of such technology requires real-time seafloor classification and detection of suitable landing sites. A landing algorithm has been developed which uses three dimensional bathymetry data and calculates a landing vector coordinate in real-time. A microscope sensor payload developed to obtain magnified images of the seafloor after landing has also been tested. Data from sea experiments are presented, where the algorithm demonstrated real-time generation of landing vector coordinates for an ROV.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129853558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603538
Martin Luck, M. Buscher, H. Lehr, C. Thiede, G. Korner, Jochen Martin, Marion Schlichting, S. Kruger, Hartmut Huth
The present paper deals with new approaches concerning pressure tolerant submerged technology. Different designs of pressure tolerant systems, which are characterized by the absence of pressure hulls, are discussed. Advantages and disadvantages of this novel technology are demonstrated. The overall pressure tolerant test platform DNS Pegel is introduced along with the main vehicle components and subsystems that highlight the pressure tolerant design. The vehicle includes an adjustable payload section. The current work discusses the sophistication of pressure tolerant systems. The goal is autonomous test dive cruises with the vehicle in the Atlantic Ocean.
{"title":"Pressure tolerant systems for deep sea applications","authors":"Martin Luck, M. Buscher, H. Lehr, C. Thiede, G. Korner, Jochen Martin, Marion Schlichting, S. Kruger, Hartmut Huth","doi":"10.1109/OCEANSSYD.2010.5603538","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603538","url":null,"abstract":"The present paper deals with new approaches concerning pressure tolerant submerged technology. Different designs of pressure tolerant systems, which are characterized by the absence of pressure hulls, are discussed. Advantages and disadvantages of this novel technology are demonstrated. The overall pressure tolerant test platform DNS Pegel is introduced along with the main vehicle components and subsystems that highlight the pressure tolerant design. The vehicle includes an adjustable payload section. The current work discusses the sophistication of pressure tolerant systems. The goal is autonomous test dive cruises with the vehicle in the Atlantic Ocean.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127503743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603524
R. Ilin, R. Deming
We discuss a versatile framework for multiple target detection and tracking based on maximum likelihood estimation with expectation maximization and a cognitive theory called dynamic logic. In this contribution extend the framework to detection of moving objects in video sequences. The paper presents the theory and an example of detection and tracking using a real world video sequence.
{"title":"Simultaneous detection and tracking of multiple objects in noisy and cluttered environment using maximum likelihood estimation framework","authors":"R. Ilin, R. Deming","doi":"10.1109/OCEANSSYD.2010.5603524","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603524","url":null,"abstract":"We discuss a versatile framework for multiple target detection and tracking based on maximum likelihood estimation with expectation maximization and a cognitive theory called dynamic logic. In this contribution extend the framework to detection of moving objects in video sequences. The paper presents the theory and an example of detection and tracking using a real world video sequence.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127317711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：