Pub Date : 2001-11-05DOI: 10.1109/OCEANS.2001.968057
W. Kirkwood, D. Gashler, H. Thomas, T. O'Reilly, R. McEwen, N. Tervalon, F. Shane, D. Au, M. Sibenac, T. Konvalina, A. Bahlavouni, J. Bellingham
The authors' goal is to greatly increase access to the Arctic Ocean by creating and demonstrating a safe and economical platform capable of basin-scale surveys. Specifically, they are developing an autonomous underwater vehicle (AUV) for Arctic research with unprecedented endurance, and the capability to relay data through the Ice to satellites. They provide a means of monitoring changes taking place in the Arctic Ocean and investigate its impact on global climate changes. The vehicle will also be capable of seafloor surveys throughout the Arctic basin. Such a capability is of national and global interest and importance.
{"title":"Development of a long endurance autonomous underwater vehicle for ocean science exploration","authors":"W. Kirkwood, D. Gashler, H. Thomas, T. O'Reilly, R. McEwen, N. Tervalon, F. Shane, D. Au, M. Sibenac, T. Konvalina, A. Bahlavouni, J. Bellingham","doi":"10.1109/OCEANS.2001.968057","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968057","url":null,"abstract":"The authors' goal is to greatly increase access to the Arctic Ocean by creating and demonstrating a safe and economical platform capable of basin-scale surveys. Specifically, they are developing an autonomous underwater vehicle (AUV) for Arctic research with unprecedented endurance, and the capability to relay data through the Ice to satellites. They provide a means of monitoring changes taking place in the Arctic Ocean and investigate its impact on global climate changes. The vehicle will also be capable of seafloor surveys throughout the Arctic basin. Such a capability is of national and global interest and importance.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127911998","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968389
M. Chaffey, E. Mellinger, W. Paul
Operating instrumentation for collecting time-series experimental data from remote benthic sites in the world's oceans has long been a challenging problem for oceanographers. A moored buoy system concept is presented that provides bi-directional near real-time communication to remote benthic instrumentation at flexible sites up to 4000 m deep using an electro-optical anchor cable. Designed to be deployed from regional class vessels, the mooring system is to be one of the main platforms for the MBARI Ocean Observatory System (MOOS) currently under development. The system concept supports a broad range of instrumentation and sampling strategies including benthic instrument clusters covering up to 10 km of seafloor, upper water column instrumentation and future AUV docking operations. Described are the functional requirements of the mooring system, the design approach, the results of the design trade-off studies completed and the resulting mooring concept design.
{"title":"Communications and power to the seafloor: MBARI's Ocean Observing System mooring concept","authors":"M. Chaffey, E. Mellinger, W. Paul","doi":"10.1109/OCEANS.2001.968389","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968389","url":null,"abstract":"Operating instrumentation for collecting time-series experimental data from remote benthic sites in the world's oceans has long been a challenging problem for oceanographers. A moored buoy system concept is presented that provides bi-directional near real-time communication to remote benthic instrumentation at flexible sites up to 4000 m deep using an electro-optical anchor cable. Designed to be deployed from regional class vessels, the mooring system is to be one of the main platforms for the MBARI Ocean Observatory System (MOOS) currently under development. The system concept supports a broad range of instrumentation and sampling strategies including benthic instrument clusters covering up to 10 km of seafloor, upper water column instrumentation and future AUV docking operations. Described are the functional requirements of the mooring system, the design approach, the results of the design trade-off studies completed and the resulting mooring concept design.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132078335","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968251
A. Trucco
Although a great amount of work has been done to develop and optimize weighting windows for an array working in narrow-band, one can verify that these windows do not provide optimal results when applied under wide-band conditions. In addition, also the methods of array thinning proposed in the literature have been devised mainly under narrow-band conditions. In this paper, after a proper definition of the wide-band beam pattern, a method is proposed that is aimed at determining the values of the weight coefficients to be assigned to the minimum set of elements of a linear array that generates a beam pattern fulfilling some a priori fixed constraints. This method relies on a stochastic scheme based on the simulated annealing algorithm. Some results showing a notable improvement in array performances (in terms of main lobe width, side lobes level, and number of array elements) with respect to unitary weighting, dense array structures are hereby presented.
{"title":"Synthesizing wide-band sparse arrays by simulated annealing","authors":"A. Trucco","doi":"10.1109/OCEANS.2001.968251","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968251","url":null,"abstract":"Although a great amount of work has been done to develop and optimize weighting windows for an array working in narrow-band, one can verify that these windows do not provide optimal results when applied under wide-band conditions. In addition, also the methods of array thinning proposed in the literature have been devised mainly under narrow-band conditions. In this paper, after a proper definition of the wide-band beam pattern, a method is proposed that is aimed at determining the values of the weight coefficients to be assigned to the minimum set of elements of a linear array that generates a beam pattern fulfilling some a priori fixed constraints. This method relies on a stochastic scheme based on the simulated annealing algorithm. Some results showing a notable improvement in array performances (in terms of main lobe width, side lobes level, and number of array elements) with respect to unitary weighting, dense array structures are hereby presented.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132227010","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968158
V. Kobylyansky, M. Domanov, L. S. Vilentchik, I. G. Akhmetsafin
Hydrophysical and hydrochemical investigations of the World Ocean allowed to detect both horizontal and vertical heterogeneities of the main salt composition of sea water (Fabricand et al, 1966; Soifer, Bichkov, Ilyichev, 1982; Kobilyansky et al, 1985; Domanov, 1992; Domanov and Vodaynaya, 1987). The interrelation between the processes of differential-diffusive convection in the thin thermolialine structure and observed variability of the main salt composition was shown in Kobilyansky et al. (1985) and Domanov (1992) for the case of generation of heterogeneities of the main salt composition of sea water in interlayers of thin thermohaline structure. For a detailed study of this phenomenon the natural and laboratory investigations of variability of the main salt composition during the processes of differential-diffusive convection were carried out. Heterogeneities of salt composition in a pack of thin thermohaline structure interlayers were studied in the Atlantic Ocean at a station with following coordinates 4/spl deg/17'N. 44/spl deg/03'W. The greatest deviation in ratio Mg/Na was 9.4% and in ratio Ca/Na-9.1%. Laboratory studies in conditions of differential-diffusion convection confirm the change of element ratios. Variations of salt composition obtained experimentally are similar to that observed in natural conditions.
{"title":"Transformation of salt composition of sea water in process of differential-diffusive convection (natural and laboratory researches)","authors":"V. Kobylyansky, M. Domanov, L. S. Vilentchik, I. G. Akhmetsafin","doi":"10.1109/OCEANS.2001.968158","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968158","url":null,"abstract":"Hydrophysical and hydrochemical investigations of the World Ocean allowed to detect both horizontal and vertical heterogeneities of the main salt composition of sea water (Fabricand et al, 1966; Soifer, Bichkov, Ilyichev, 1982; Kobilyansky et al, 1985; Domanov, 1992; Domanov and Vodaynaya, 1987). The interrelation between the processes of differential-diffusive convection in the thin thermolialine structure and observed variability of the main salt composition was shown in Kobilyansky et al. (1985) and Domanov (1992) for the case of generation of heterogeneities of the main salt composition of sea water in interlayers of thin thermohaline structure. For a detailed study of this phenomenon the natural and laboratory investigations of variability of the main salt composition during the processes of differential-diffusive convection were carried out. Heterogeneities of salt composition in a pack of thin thermohaline structure interlayers were studied in the Atlantic Ocean at a station with following coordinates 4/spl deg/17'N. 44/spl deg/03'W. The greatest deviation in ratio Mg/Na was 9.4% and in ratio Ca/Na-9.1%. Laboratory studies in conditions of differential-diffusion convection confirm the change of element ratios. Variations of salt composition obtained experimentally are similar to that observed in natural conditions.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130125341","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968717
D. Sternlicht, D.W. Lernonds, R. Dikeman, M. Ericksen, S. Schock
Cost- and time-effective mine countermeasures have become high priority in today's U.S. Navy. Current systems lack adequate target classification/localization capabilities; and thus development of new and innovative technologies is essential for mine search operations in littoral environments. A unique system design is described that fuses sub-bottom seafloor imagery and signal classification algorithms. Seafloor and subbottom maps are produced by a compact 6 transmitter, 32 element receive array sonar system employing a FM upsweep transmit signal containing energy from 5 to 23 kHz. This system provides 4 to 8 cm spatial resolution, up to 2 m bottom penetration, and is ideally suited for detecting proud and buried mine-like targets. Image processing algorithms automatically detect and localize targets of interest. Targets are extracted and passed to biomimetic signal classification algorithms that map time-frequency patterns into object class declarations. The system and processing stages are presented and an experiment is described in which buried objects consisting of a concrete block, coral head, sand-filled aluminum spheres, sand-filled scuba tanks, 155 mm ordnance, and a mine-shape are successfully differentiated. These results are encouraging, and suggest that a hybrid system employing a conjunct seafloor image and biomimetic signal classification can rapidly and accurately detect and classify buried mine-like objects in the littorals.
{"title":"Detection and classification of buried objects with an adaptive acoustic mine-hunting system","authors":"D. Sternlicht, D.W. Lernonds, R. Dikeman, M. Ericksen, S. Schock","doi":"10.1109/OCEANS.2001.968717","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968717","url":null,"abstract":"Cost- and time-effective mine countermeasures have become high priority in today's U.S. Navy. Current systems lack adequate target classification/localization capabilities; and thus development of new and innovative technologies is essential for mine search operations in littoral environments. A unique system design is described that fuses sub-bottom seafloor imagery and signal classification algorithms. Seafloor and subbottom maps are produced by a compact 6 transmitter, 32 element receive array sonar system employing a FM upsweep transmit signal containing energy from 5 to 23 kHz. This system provides 4 to 8 cm spatial resolution, up to 2 m bottom penetration, and is ideally suited for detecting proud and buried mine-like targets. Image processing algorithms automatically detect and localize targets of interest. Targets are extracted and passed to biomimetic signal classification algorithms that map time-frequency patterns into object class declarations. The system and processing stages are presented and an experiment is described in which buried objects consisting of a concrete block, coral head, sand-filled aluminum spheres, sand-filled scuba tanks, 155 mm ordnance, and a mine-shape are successfully differentiated. These results are encouraging, and suggest that a hybrid system employing a conjunct seafloor image and biomimetic signal classification can rapidly and accurately detect and classify buried mine-like objects in the littorals.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130167719","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968758
S. Zhao, J. Yuh, H. Choi
This paper describes a new navigation control system for AUVs. Unlike controllers for ROVs, AUVs require smart controllers adapting to changes in the system and environment since the controller cannot be tuned while AUV are in water. The presented controller consists of a nonregressor based adaptive controller and a disturbance observer (DOB). The DOB converts the original nonlinear vehicle dynamics with modelling errors and disturbance into a simple linear nominal model and the adaptive controller compensates for the residual disturbance errors due to any time delay in the DOB filter. The presented control system does not require any parametric information about the vehicle dynamics and provides robustness with respect to disturbance, such as current, modeling errors and hydrodynamic uncertainties. Results of simulation on a UH AUV, ODIN model show effectiveness of the presented control system.
{"title":"Adaptive DOB control of underwater robotic vehicles","authors":"S. Zhao, J. Yuh, H. Choi","doi":"10.1109/OCEANS.2001.968758","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968758","url":null,"abstract":"This paper describes a new navigation control system for AUVs. Unlike controllers for ROVs, AUVs require smart controllers adapting to changes in the system and environment since the controller cannot be tuned while AUV are in water. The presented controller consists of a nonregressor based adaptive controller and a disturbance observer (DOB). The DOB converts the original nonlinear vehicle dynamics with modelling errors and disturbance into a simple linear nominal model and the adaptive controller compensates for the residual disturbance errors due to any time delay in the DOB filter. The presented control system does not require any parametric information about the vehicle dynamics and provides robustness with respect to disturbance, such as current, modeling errors and hydrodynamic uncertainties. Results of simulation on a UH AUV, ODIN model show effectiveness of the presented control system.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134437808","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968286
T. A. Gates, R. Herman
Discusses ship acoustics and how it evolved in the USNS PATHFINDER (T-AGS 60) class ship acquisition program. During the initial ship delivery process for this program it was determined that the acoustic posture of these ships was inadequate to support the mission requirement of deep-water bottom mapping. A comprehensive investigation was conducted and problem areas were identified. This paper summarizes the findings of that investigation and subsequent ones to fully document the acoustic issues that were present on this new class of ships. Additionally, the modifications and improvements that were made to these hulls are addressed to share with the community the importance of vessel acoustic posture and how it relates to mission performance with respect to acoustics. The types of modifications addressed are: sonar fairing design, paint and hull conditions, propeller cavitation performance, hull appendages, bubble sweepdown and general acoustic requirements. Acoustic measurements and levels are provided as well as specific measures of system performance.
{"title":"Acoustic improvements for USNS PATHFINDER (T-AGS 60) class oceanographic ships","authors":"T. A. Gates, R. Herman","doi":"10.1109/OCEANS.2001.968286","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968286","url":null,"abstract":"Discusses ship acoustics and how it evolved in the USNS PATHFINDER (T-AGS 60) class ship acquisition program. During the initial ship delivery process for this program it was determined that the acoustic posture of these ships was inadequate to support the mission requirement of deep-water bottom mapping. A comprehensive investigation was conducted and problem areas were identified. This paper summarizes the findings of that investigation and subsequent ones to fully document the acoustic issues that were present on this new class of ships. Additionally, the modifications and improvements that were made to these hulls are addressed to share with the community the importance of vessel acoustic posture and how it relates to mission performance with respect to acoustics. The types of modifications addressed are: sonar fairing design, paint and hull conditions, propeller cavitation performance, hull appendages, bubble sweepdown and general acoustic requirements. Acoustic measurements and levels are provided as well as specific measures of system performance.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131557172","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968784
F. Fell, M. Tanenbaum
In fiscal year 2001, the National Imagery and Mapping Agency (NIMA) initiated a project (i) to examine selected national vertical datums in order to evaluate their consistency with orthometric heights derived from Global Positioning System (WGS84) ellipsoid heights and EGM96 geoid heights and (ii) to address the potential for converting bathymetric depths from coastal hydrographic charts to WGS84 depths. This paper discusses preliminary findings obtained during the initial phases of the project. Systematic differences between the EGM96 geoid and various national vertical datums were determined and modeled. These models enable heights to be transformed between local vertical datums and WGS84. A concept for addressing hydrographic chart depth conversion based on GPS positioning of the chart datum (e.g., Mean Low Low Water) is also discussed.
{"title":"Preliminary comparisons of the WGS84(EGM 96) geoid with national vertical datums","authors":"F. Fell, M. Tanenbaum","doi":"10.1109/OCEANS.2001.968784","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968784","url":null,"abstract":"In fiscal year 2001, the National Imagery and Mapping Agency (NIMA) initiated a project (i) to examine selected national vertical datums in order to evaluate their consistency with orthometric heights derived from Global Positioning System (WGS84) ellipsoid heights and EGM96 geoid heights and (ii) to address the potential for converting bathymetric depths from coastal hydrographic charts to WGS84 depths. This paper discusses preliminary findings obtained during the initial phases of the project. Systematic differences between the EGM96 geoid and various national vertical datums were determined and modeled. These models enable heights to be transformed between local vertical datums and WGS84. A concept for addressing hydrographic chart depth conversion based on GPS positioning of the chart datum (e.g., Mean Low Low Water) is also discussed.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"548 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131826132","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968264
G. Bruzzone, R. Bono, M. Caccia, G. Veruggio
Logistics problems and high costs necessary to carry out experiments with robots in hazardous environments such as the open sea led to the development of simulation environments (SE) where the physical robot and the operating environment can be substituted by real-time simulators in a way that is completely transparent to the robot's control and sensing modules. SEs are extremely useful tools which allow to rapidly designing, developing, testing and evaluating in lab the working of an underwater vehicle and to minimise the risks to lose expensive equipment during in field testing. In this paper the SE developed by the National Research Council, Institute for Ship Automation of Genoa (CNR-IAN) will be presented.
{"title":"A simulation environment for unmanned underwater vehicles development","authors":"G. Bruzzone, R. Bono, M. Caccia, G. Veruggio","doi":"10.1109/OCEANS.2001.968264","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968264","url":null,"abstract":"Logistics problems and high costs necessary to carry out experiments with robots in hazardous environments such as the open sea led to the development of simulation environments (SE) where the physical robot and the operating environment can be substituted by real-time simulators in a way that is completely transparent to the robot's control and sensing modules. SEs are extremely useful tools which allow to rapidly designing, developing, testing and evaluating in lab the working of an underwater vehicle and to minimise the risks to lose expensive equipment during in field testing. In this paper the SE developed by the National Research Council, Institute for Ship Automation of Genoa (CNR-IAN) will be presented.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123161641","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 : 2001-11-05DOI: 10.1109/OCEANS.2001.968313
Yong Wei, K. Cheung, G. Curtis, C. McCreety
A methodology to forecast tsunami height based on real-time water-level data near the source is presented in this paper. The inverse method, which uses water level data to infer seismic source parameters, is extended to predict the tsunami waveforms away from the source. This study focuses on the Aleutian-Alaska source region and its potential threat to Hawaii. In the algorithm, the source region is divided into 41 sub-faults based on Johnson's (1999) analyses of major tsunamigenic earthquakes from 1938 to 1986. A linear longwave model is used to generate a database of synthetic mareograms at 14 water-level stations near the source and at six locations away from the source. Given tsunami signals at the water-level stations, a least-squares routine provides the expected waveforms near the Hawaiian Islands and a jackknife re-sampling scheme provides the confidence interval bounds of the predictions. The algorithm and the database are verified using actual water-level data of past tsunami events.
{"title":"Tsunami height forecast from water-level data","authors":"Yong Wei, K. Cheung, G. Curtis, C. McCreety","doi":"10.1109/OCEANS.2001.968313","DOIUrl":"https://doi.org/10.1109/OCEANS.2001.968313","url":null,"abstract":"A methodology to forecast tsunami height based on real-time water-level data near the source is presented in this paper. The inverse method, which uses water level data to infer seismic source parameters, is extended to predict the tsunami waveforms away from the source. This study focuses on the Aleutian-Alaska source region and its potential threat to Hawaii. In the algorithm, the source region is divided into 41 sub-faults based on Johnson's (1999) analyses of major tsunamigenic earthquakes from 1938 to 1986. A linear longwave model is used to generate a database of synthetic mareograms at 14 water-level stations near the source and at six locations away from the source. Given tsunami signals at the water-level stations, a least-squares routine provides the expected waveforms near the Hawaiian Islands and a jackknife re-sampling scheme provides the confidence interval bounds of the predictions. The algorithm and the database are verified using actual water-level data of past tsunami events.","PeriodicalId":326183,"journal":{"name":"MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295)","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131880975","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}
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