Pub Date : 2010-05-24DOI: 10.1109/OCEANSSYD.2010.5603788
Bin Shen, S. Perry, D. Fraser
We present an adaptive weighted temporal averaging filter with implicit motion-compensation for effective object enhancement in sector scan sonar image sequences. Visual blurring artifacts introduced by the temporal filtering process due to motion of the sonar platform are minimized by accurate motion estimation and compensation. An algorithm is proposed to perform object boundary extraction for better motion estimation. Motion estimation is performed directly on polar image sequences using cross-correlation followed by a Minimum Mean Square Error (MMSE) method. Each pixel of the filtered image is computed as the weighted average of the image pixel values over successive frames after motion compensation. The performance of the proposed filter is tested using real sector scan sonar image sequences and the results are compared with those obtained using the temporal averaging and motion compensated temporal averaging filters.
{"title":"Adaptive motion-compensated temporal filtering of sector scan sonar image sequences","authors":"Bin Shen, S. Perry, D. Fraser","doi":"10.1109/OCEANSSYD.2010.5603788","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603788","url":null,"abstract":"We present an adaptive weighted temporal averaging filter with implicit motion-compensation for effective object enhancement in sector scan sonar image sequences. Visual blurring artifacts introduced by the temporal filtering process due to motion of the sonar platform are minimized by accurate motion estimation and compensation. An algorithm is proposed to perform object boundary extraction for better motion estimation. Motion estimation is performed directly on polar image sequences using cross-correlation followed by a Minimum Mean Square Error (MMSE) method. Each pixel of the filtered image is computed as the weighted average of the image pixel values over successive frames after motion compensation. The performance of the proposed filter is tested using real sector scan sonar image sequences and the results are compared with those obtained using the temporal averaging and motion compensated temporal averaging filters.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"64 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":"127890397","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.2010.5603616
J. D. Rodgers, J. Wharington
Underwater gliders are a type of long range unmanned vehicle that use bouyancy control and lifting surfaces to travel in a sawtooth trajectory through the water column. These vehicles are typically employed by oceanographers for environmental monitoring and also show promise as a sensor platform in military applications. This paper presents investigations of vehicle hydrodynamics relating to the deployment of a Slocum Glider from conventional submarines, where the standard vehicle was fitted with low aspect ratio wings to enable it to fit into a sabot for deployment from a 21 inch torpedo tube.
{"title":"Hydrodynamic implications for submarine launched underwater gliders","authors":"J. D. Rodgers, J. Wharington","doi":"10.1109/OCEANSSYD.2010.5603616","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603616","url":null,"abstract":"Underwater gliders are a type of long range unmanned vehicle that use bouyancy control and lifting surfaces to travel in a sawtooth trajectory through the water column. These vehicles are typically employed by oceanographers for environmental monitoring and also show promise as a sensor platform in military applications. This paper presents investigations of vehicle hydrodynamics relating to the deployment of a Slocum Glider from conventional submarines, where the standard vehicle was fitted with low aspect ratio wings to enable it to fit into a sabot for deployment from a 21 inch torpedo tube.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"170 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":"131334316","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.2010.5603656
S. Pennec, G. Touin, S. Azou, L. Collin
The underwater positioning applications with ultra-short base line (USBL) antenna have expanded significantly over last decades. Their principles are based on the geographical positioning of transponders emitting deterministic waveform such as Costas arrays from a receiving antenna composed of several acoustic transducers. Recovering from the transponder of external information such as immersion can increase accuracy of USBL positioning system. Jointly achieving a digital positioning and communication in a shallow water channel requires a careful design of the algorithms to get acceptable performance at limited complexity. This issue is investigated in the present paper. A processing chain design combining underwater acoustic communication and positioning through BFSK modulation of the data over Costas arrays is proposed, discussed and evaluated. Results show that the developed communication method is an efficient tradeoff between simultaneous transmission of telemetry data and positioning signal at a limited complexity. An experiment at sea will be conducted by IXSEA soon to confirm these first lab results.
{"title":"On joint acoustic communication and positioning through MFSK-modulated signals and Costas arrays","authors":"S. Pennec, G. Touin, S. Azou, L. Collin","doi":"10.1109/OCEANSSYD.2010.5603656","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603656","url":null,"abstract":"The underwater positioning applications with ultra-short base line (USBL) antenna have expanded significantly over last decades. Their principles are based on the geographical positioning of transponders emitting deterministic waveform such as Costas arrays from a receiving antenna composed of several acoustic transducers. Recovering from the transponder of external information such as immersion can increase accuracy of USBL positioning system. Jointly achieving a digital positioning and communication in a shallow water channel requires a careful design of the algorithms to get acceptable performance at limited complexity. This issue is investigated in the present paper. A processing chain design combining underwater acoustic communication and positioning through BFSK modulation of the data over Costas arrays is proposed, discussed and evaluated. Results show that the developed communication method is an efficient tradeoff between simultaneous transmission of telemetry data and positioning signal at a limited complexity. An experiment at sea will be conducted by IXSEA soon to confirm these first lab results.","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":"129203422","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.2010.5603811
François-Xavier Socheleau, C. Laot, J. Passerieux
Based on a method of inductive inference known as the principle of maximum entropy, a time-varying underwater acoustic channel model is derived. The resulting model is proved to be consistent so that it only relies on the available knowledge of the environment to model. While requiring only a few parameters (e.g. channel average power and Doppler spread), it is shown through fading statistics and bit error rates measurements that accurate channel impulse responses can be obtained for communication applications. The Matlab code of the proposed model is available at http://perso.telecom-bretagne. eu/fxsocheleau/software.
{"title":"A maximum entropy framework for statistical modeling of underwater acoustic communication channels","authors":"François-Xavier Socheleau, C. Laot, J. Passerieux","doi":"10.1109/OCEANSSYD.2010.5603811","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603811","url":null,"abstract":"Based on a method of inductive inference known as the principle of maximum entropy, a time-varying underwater acoustic channel model is derived. The resulting model is proved to be consistent so that it only relies on the available knowledge of the environment to model. While requiring only a few parameters (e.g. channel average power and Doppler spread), it is shown through fading statistics and bit error rates measurements that accurate channel impulse responses can be obtained for communication applications. The Matlab code of the proposed model is available at http://perso.telecom-bretagne. eu/fxsocheleau/software.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"6 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":"114233495","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.2010.5603794
Guolin Liu, Huadong Hao, Fanlin Yang, Man Yan, Zhixing Du, Y. Dang
Phase unwrapping is the key step in Digital Elevation Model extraction and the measurement of surface deformation of Interferometric Synthetic Aperture Radar (InSAR). When in steep terrain or larger slope, the unwrapping result is bad and causes error transmission using the existing Kalman Filter phase unwrapping algorithm. Considering this situation, this paper presents an improved Kalman Filter phase unwrapping algorithm based on topographic factors for InSAR. It can be implemented through the introduction of the input control variable associated with topographic factors to the state-space model of Kalman Filter. Owing to the fact that the interference fringes directly reflect the change of the terrain and local fringe frequency is closely related with the local terrain slope, the local fringe frequency estimation can be used as the input control variable. In the local frequency estimation, using two-dimensional Chirp-Z transform, better estimate of the results may be quickly get. In this paper, using simulated data and real InSAR data to do the experiment, it can gain more reliable result compared with the conventional Kalman filter phase unwrapping algorithm. It is verified that the proposed algorithm can effectively deal with the situation of steep terrain and larger slope.
{"title":"InSAR Kalman Filter phase unwrapping algorithm based on topographic factors","authors":"Guolin Liu, Huadong Hao, Fanlin Yang, Man Yan, Zhixing Du, Y. Dang","doi":"10.1109/OCEANSSYD.2010.5603794","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603794","url":null,"abstract":"Phase unwrapping is the key step in Digital Elevation Model extraction and the measurement of surface deformation of Interferometric Synthetic Aperture Radar (InSAR). When in steep terrain or larger slope, the unwrapping result is bad and causes error transmission using the existing Kalman Filter phase unwrapping algorithm. Considering this situation, this paper presents an improved Kalman Filter phase unwrapping algorithm based on topographic factors for InSAR. It can be implemented through the introduction of the input control variable associated with topographic factors to the state-space model of Kalman Filter. Owing to the fact that the interference fringes directly reflect the change of the terrain and local fringe frequency is closely related with the local terrain slope, the local fringe frequency estimation can be used as the input control variable. In the local frequency estimation, using two-dimensional Chirp-Z transform, better estimate of the results may be quickly get. In this paper, using simulated data and real InSAR data to do the experiment, it can gain more reliable result compared with the conventional Kalman filter phase unwrapping algorithm. It is verified that the proposed algorithm can effectively deal with the situation of steep terrain and larger slope.","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":"121245360","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.2010.5603826
J. Mare
This paper describes a simple online target point generator algorithm that allows for minimal specification of Autonomous Underwater Vehicle (AUV) missions. The mission pattern is specified through the spatial coordinates of its corners only, requiring minimal mission information storage in order to execute a mission. To follow the mission path the algorithm generates intermediate target points along the desired trajectory based on the current estimated position of the AUV. The performance of the algorithm when implemented and tested in a real AUV is reported.
{"title":"Path following algorithm for minimally specified lawn-mower type AUV missions","authors":"J. Mare","doi":"10.1109/OCEANSSYD.2010.5603826","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603826","url":null,"abstract":"This paper describes a simple online target point generator algorithm that allows for minimal specification of Autonomous Underwater Vehicle (AUV) missions. The mission pattern is specified through the spatial coordinates of its corners only, requiring minimal mission information storage in order to execute a mission. To follow the mission path the algorithm generates intermediate target points along the desired trajectory based on the current estimated position of the AUV. The performance of the algorithm when implemented and tested in a real AUV is reported.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"460 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":"116729278","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.2010.5603900
D. Rolland, P. Clark
Research vessels are unique among ship types because of the extremely varied nature of their operating profiles and requirements. While most commercial ships and many naval vessels tend to operate in a transit condition at fairly constant speeds, research vessels encounter very different operating conditions depending on the nature of the scientific research being conducted. These varied profiles can put significantly different demands on a propulsion system and make it difficult to design a system that adequately satisfies all the requirements and is cost effective to operate.
{"title":"Propulsion system considerations for research vessels","authors":"D. Rolland, P. Clark","doi":"10.1109/OCEANSSYD.2010.5603900","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603900","url":null,"abstract":"Research vessels are unique among ship types because of the extremely varied nature of their operating profiles and requirements. While most commercial ships and many naval vessels tend to operate in a transit condition at fairly constant speeds, research vessels encounter very different operating conditions depending on the nature of the scientific research being conducted. These varied profiles can put significantly different demands on a propulsion system and make it difficult to design a system that adequately satisfies all the requirements and is cost effective to operate.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"38 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":"124909881","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.2010.5603950
H. Sugimatsu, T. Ura, J. Kojima, Hiroshi Shimura, K. Maejima, Koichi Kato, Yuki Tahara, Ayako Takahashi, S. Hiryu, Emyo Fujioka, Yoshiaki Watanabe
Long-term real-time monitoring of free-ranging Bottlenose dolphins (Tursiops truncatus) in the pool of the aquarium “Izu Mito Sea paradise”, i.e. in the enclosed observatory has been started from 22nd June 2008, and continuously conducted ever since then. The monitoring system consists of 1) a modified 5-hydrophone array system deployed in the pool, 2) a web camera placed overland for visual monitoring of the dolphins, and 3) the land base system to process and transmit the acoustic data from the hydrophones of the array and the video images from the web camera to the servers in real-time via internet. The echo-location characteristics of the Bottlenose dolphins in the pool and their behavioral changes in a long-term span have been initially observed and analyzed. Three echolocation phases (search, approach, terminal) have been observed. It is estimated that the dolphins are echo-locating the surrounding environment and targeting something else such as the array as a target. Solo burst-pulses emitted by one of two dolphins swimming side by side in the pool were also observed. For understanding the Bottlenose dolphins' behavioral changes during the long-term monitoring, the trend of the number of clicks recorded around the pool is applied for the analysis as an index of the dolphin's activities. The results show the trend and difference of the changes of the click number in each section of the pool depending on the time of day. Not only depending on the time, but also depending on natural phenomena, the dolphins' behavioral changes were observed. A definite trend of click number reduction is observed during the occurrence of an earthquake, even when they stayed underwater. Significant behavioral changes of the dolphins are also observed just after the earthquake. This indicates that the Bottlenose dolphins in the pool of the “Izu Mito Sea Paradise” did not actually “predict” the earthquake.
{"title":"Long-term real-time monitoring of free-ranging Bottlenose dolphins (Tursiops truncatus) in an aquarium using 5-hydrophone array system","authors":"H. Sugimatsu, T. Ura, J. Kojima, Hiroshi Shimura, K. Maejima, Koichi Kato, Yuki Tahara, Ayako Takahashi, S. Hiryu, Emyo Fujioka, Yoshiaki Watanabe","doi":"10.1109/OCEANSSYD.2010.5603950","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603950","url":null,"abstract":"Long-term real-time monitoring of free-ranging Bottlenose dolphins (Tursiops truncatus) in the pool of the aquarium “Izu Mito Sea paradise”, i.e. in the enclosed observatory has been started from 22nd June 2008, and continuously conducted ever since then. The monitoring system consists of 1) a modified 5-hydrophone array system deployed in the pool, 2) a web camera placed overland for visual monitoring of the dolphins, and 3) the land base system to process and transmit the acoustic data from the hydrophones of the array and the video images from the web camera to the servers in real-time via internet. The echo-location characteristics of the Bottlenose dolphins in the pool and their behavioral changes in a long-term span have been initially observed and analyzed. Three echolocation phases (search, approach, terminal) have been observed. It is estimated that the dolphins are echo-locating the surrounding environment and targeting something else such as the array as a target. Solo burst-pulses emitted by one of two dolphins swimming side by side in the pool were also observed. For understanding the Bottlenose dolphins' behavioral changes during the long-term monitoring, the trend of the number of clicks recorded around the pool is applied for the analysis as an index of the dolphin's activities. The results show the trend and difference of the changes of the click number in each section of the pool depending on the time of day. Not only depending on the time, but also depending on natural phenomena, the dolphins' behavioral changes were observed. A definite trend of click number reduction is observed during the occurrence of an earthquake, even when they stayed underwater. Significant behavioral changes of the dolphins are also observed just after the earthquake. This indicates that the Bottlenose dolphins in the pool of the “Izu Mito Sea Paradise” did not actually “predict” the earthquake.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"37 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114034495","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.2010.5603797
E. Zimmerman
Harsh offshore environments in the Gulf of Mexico and offshore Australia have lead to a compelling need for high efficiency anchors that present minimal risk to natural and industry assets when utilized for mooring. Efficiency is measured in both capacity versus mass and in the relative cost of installation for a given application. Risk to assets is measured by performance when mooring systems are overloaded by cyclonic storms in excess of the design condition. This paper covers the key development steps of the OMNI-Max anchor; high efficiency gravity installed marine foundation for mooring. Included are the key design challenges, the fundamental behavioral properties of the anchor, experience from offshore testing, full scale installation histories, and documented tropical cyclone performance.
{"title":"Proven high efficiency anchor for harsh cyclonic environments","authors":"E. Zimmerman","doi":"10.1109/OCEANSSYD.2010.5603797","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603797","url":null,"abstract":"Harsh offshore environments in the Gulf of Mexico and offshore Australia have lead to a compelling need for high efficiency anchors that present minimal risk to natural and industry assets when utilized for mooring. Efficiency is measured in both capacity versus mass and in the relative cost of installation for a given application. Risk to assets is measured by performance when mooring systems are overloaded by cyclonic storms in excess of the design condition. This paper covers the key development steps of the OMNI-Max anchor; high efficiency gravity installed marine foundation for mooring. Included are the key design challenges, the fundamental behavioral properties of the anchor, experience from offshore testing, full scale installation histories, and documented tropical cyclone performance.","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":"114054657","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.2010.5603601
N. Margvelashvili, J. Parslow, M. Herzfeld, K. Wild-Allen, J. Andrewartha, F. Rizwi, E. Jones
With the rapid advances in on-line observing system applications, the paradigm in environmental modelling is shifting from one-off models for specific purposes, to operational models, sequentially assimilating data streams from in situ and remote sensors. Such models can provide products and services to support a wide range of applications, from short-term forecasting to long-term scenarios, and are expected to deliver superior performance much more cost-effectively. In the marine field, this is most advanced for circulation models at large ocean scales. The potential benefit from these advances is even greater in the coastal zone, where human uses, impacts and ecosystem services are concentrated. However, there are substantial challenges to be overcome. Coastal applications typically require biogeochemical, ecological, and ultimately socioeconomic models. These additional models are more complex, with higher uncertainty, and require different approaches to data assimilation and uncertainty analysis. The uncertainties arise from a number of sources including poorly known parameters, structural errors and stochastic forcing. When model realisations are sufficiently fast, Monte Carlo techniques can be used to improve the model performance and assess its quality, otherwise alternative estimation techniques are required. This paper describes the development of an operational, data-assimilating coastal model for SE Tasmania, integrating across hydrodynamics, sediment dynamics and biogeochemistry. Inputs and outputs from the model are expected to be integrated into the regional information system (INFORMD), and to be used directly in multiple management applications, and as input into ecosystem models. A hydrodynamic model, nested inside an operational global model, will be assimilating data from the coastal sensor network and other sources, including remote sensing. The model is based on an operational modelling platform developed by CSIRO through the BlueLink project (ROAM), and will be used to implement and test data-assimilation techniques for coastal models under development in BlueLink. Operational sediment dynamic and biogeochemical models, will be coupled to the hydrodynamic model, either directly or through intermediate transport models. Data-assimilating techniques for these models currently are under development in Computational and Simulation Sciences theme, CSIRO. This paper outlines preliminary results from these developments. A number of candidate techniques including Kalman Filter, Particle Filter and MCMC are discussed. The utility of fast and cheap statistical surrogates of complex models (emulators) for sequential data assimilation is illustrated through the trial application of emulators to one-dimensional sediment/pollutant and 3-d sediment transport models.
{"title":"Development of operational data-assimilating water quality modelling system for South-East Tasmania","authors":"N. Margvelashvili, J. Parslow, M. Herzfeld, K. Wild-Allen, J. Andrewartha, F. Rizwi, E. Jones","doi":"10.1109/OCEANSSYD.2010.5603601","DOIUrl":"https://doi.org/10.1109/OCEANSSYD.2010.5603601","url":null,"abstract":"With the rapid advances in on-line observing system applications, the paradigm in environmental modelling is shifting from one-off models for specific purposes, to operational models, sequentially assimilating data streams from in situ and remote sensors. Such models can provide products and services to support a wide range of applications, from short-term forecasting to long-term scenarios, and are expected to deliver superior performance much more cost-effectively. In the marine field, this is most advanced for circulation models at large ocean scales. The potential benefit from these advances is even greater in the coastal zone, where human uses, impacts and ecosystem services are concentrated. However, there are substantial challenges to be overcome. Coastal applications typically require biogeochemical, ecological, and ultimately socioeconomic models. These additional models are more complex, with higher uncertainty, and require different approaches to data assimilation and uncertainty analysis. The uncertainties arise from a number of sources including poorly known parameters, structural errors and stochastic forcing. When model realisations are sufficiently fast, Monte Carlo techniques can be used to improve the model performance and assess its quality, otherwise alternative estimation techniques are required. This paper describes the development of an operational, data-assimilating coastal model for SE Tasmania, integrating across hydrodynamics, sediment dynamics and biogeochemistry. Inputs and outputs from the model are expected to be integrated into the regional information system (INFORMD), and to be used directly in multiple management applications, and as input into ecosystem models. A hydrodynamic model, nested inside an operational global model, will be assimilating data from the coastal sensor network and other sources, including remote sensing. The model is based on an operational modelling platform developed by CSIRO through the BlueLink project (ROAM), and will be used to implement and test data-assimilation techniques for coastal models under development in BlueLink. Operational sediment dynamic and biogeochemical models, will be coupled to the hydrodynamic model, either directly or through intermediate transport models. Data-assimilating techniques for these models currently are under development in Computational and Simulation Sciences theme, CSIRO. This paper outlines preliminary results from these developments. A number of candidate techniques including Kalman Filter, Particle Filter and MCMC are discussed. The utility of fast and cheap statistical surrogates of complex models (emulators) for sequential data assimilation is illustrated through the trial application of emulators to one-dimensional sediment/pollutant and 3-d sediment transport models.","PeriodicalId":129808,"journal":{"name":"OCEANS'10 IEEE SYDNEY","volume":"29 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":"115177011","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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