2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies最新文献_第8页

A cabled monitoring module for gas seepage: the first experiment in a pockmark (Patras Gulf, Greece) 气体渗漏电缆监测模块:麻坑的第一次实验(希腊帕特雷湾)

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370810

G. Marinaro, G. Etiope, N. Lo Bue, P. Favali, G. Papatheodorou, D. Christodoulou, F. Furlan, F. Gasparoni, G. Ferentinos, M. Masson, J. Rolin

{"title":"A cabled monitoring module for gas seepage: the first experiment in a pockmark (Patras Gulf, Greece)","authors":"G. Marinaro, G. Etiope, N. Lo Bue, P. Favali, G. Papatheodorou, D. Christodoulou, F. Furlan, F. Gasparoni, G. Ferentinos, M. Masson, J. Rolin","doi":"10.1109/UT.2007.370810","DOIUrl":"https://doi.org/10.1109/UT.2007.370810","url":null,"abstract":"A new seafloor observatory, the Gas Monitoring Module (GMM), has been developed for continuous and long-term measurements of methane concentration in seawater at the benthic boundary layer, as a result of marine environmental geology and technology synergy. The module is designed to host a series of sensors controlled and managed by a data acquisition and control system able to perform first-level data quality checks. The prototype includes semiconductor methane sensors, an H2S sensor and a CTD for temperature, salinity, pressure recording, as well as interfaces for additional sensors. GMM was deployed in April 2004 within an active gas-bearing pockmark in the Gulf of Patras (Greece), at a water depth of 42 m. Through a submarine cable linked to an onshore station, it was possible to remotely check, via direct phone connection, GMM functioning and to receive data in near-real time. Recordings were carried out in two consecutive campaigns over the periods April-July 2004, and September 2004-January 2005, amounting to a combined dataset of ca. 6.5 months. This represents the first long-term monitoring ever done on gas leakage from pockmarks by means of CH4+H2S+T+P sensors. The results show frequent T and P drops associated with gas peaks, more than 60 events in 6.5 months, likely due to intermittent, pulsation-like seepage. This seepage \"pulsation\" can either be an active process driven by pressure build-up in the pockmark sediments, or a passive fluid release due to hydrostatic pressure drops induced by bottom currents cascading into the pockmark depression. Redundancy and comparison of data from different sensors were fundamental to interpret subtle proxy signals of temperature and pressure which would not be understood using only one sensor.","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970664","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}

引用次数: 2

Toward Semi-real-time GPS/A Seafloor Positioning with a Moored Buoy 基于系泊浮标的半实时GPS/A海底定位研究

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370787

H. Fujimoto, M. Kido, Y. Osada, Y. Kaneda

引用次数: 1

Comparison of Mathematical Models for the HUGIN 4500 AUV Based on Experimental Data 基于实验数据的HUGIN 4500水下航行器数学模型比较

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370776

O. Hegrenses, O. Hallingstad, B. Jalving

{"title":"Comparison of Mathematical Models for the HUGIN 4500 AUV Based on Experimental Data","authors":"O. Hegrenses, O. Hallingstad, B. Jalving","doi":"10.1109/UT.2007.370776","DOIUrl":"https://doi.org/10.1109/UT.2007.370776","url":null,"abstract":"This paper reports the development and comparison of several mathematical models for describing the response of the HUGIN 4500 AUV as a function of measured actuator inputs. As a crucial step in fitting the derived models to experimental field data, a combination of dedicated experiments and least-squares estimation is applied in order to obtain an estimate of the sea current, and properly compensate for it during the identification stage. The established models are extensively cross-validated with uncorrelated data, which is a standard step in system identification to prevent over-fitting observed data. The vehicle response predicted by the proposed models shows good agreement with real measurements. The possible use of mathematical vehicle models includes control and navigation system design, applications to fault detection and integrity, and vehicle design evaluation. The content of this paper is motivated from the perspective of developing second generation underwater navigation systems, tightly integrating model-based velocity estimates and knowledge of commanded and measured actuator signals.","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"491 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132898690","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}

引用次数: 44

Fiber Optic 4C Seabed Cable For Permanent Reservoir Monitoring 用于永久水库监测的光纤4C海底电缆

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370762

S. Maas, I. Buchan

引用次数: 12

Relative localisation for AUV swarms AUV群的相对定位

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370780

N. Kottege, U. Zimmer

引用次数: 19

Development of Seafloor Geodetic Observation System Based on AUV Technology 基于水下航行器技术的海底大地观测系统研制

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370789

M. Mochizuki, A. Asada, T. Ura, T. Tanaka, Hong Zheng, T. Ensign, K. Kawai, O. Colombo, K. Nagahashi

引用次数: 1

Power and Communication Architectures for Cabled Subsea Observatories 海底电缆观测站的电力和通信架构

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370956

S. Barlow, J. Flynn, S. Terada, W. Mudge

引用次数: 5

Precise real-time observatory and simulating phenomena of earthquakes and tsunamis around the Nankai Trough - Towards the understanding of mega thrust earthquakes - 南开海槽周边地震、海啸的精确实时观测与模拟——对特大逆冲地震的认识

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370806

Y. Kaneda, K. Kawaguchi, E. Araki, H. Matsumoto, T. Nakamura, S. Kamiya, T. Hori, T. Baba

{"title":"Precise real-time observatory and simulating phenomena of earthquakes and tsunamis around the Nankai Trough - Towards the understanding of mega thrust earthquakes -","authors":"Y. Kaneda, K. Kawaguchi, E. Araki, H. Matsumoto, T. Nakamura, S. Kamiya, T. Hori, T. Baba","doi":"10.1109/UT.2007.370806","DOIUrl":"https://doi.org/10.1109/UT.2007.370806","url":null,"abstract":"In many researches focusing on the mega-thrust earthquakes around the Nankai trough, the structural researches using refractions and reflections seismic has succeeded to image the key structures to understand recurrences of mega-thrust earthquakes around the Nankai Trough. Moreover, results of earthquake recurrence cycle simulation show that the first ruptures seems to occurred around the Tonankai earthquake rupture zone in each recurrence cycle, and the clear segment boundary between the Tonankai and Nankai earthquake rupture zones off the Kii peninsula was analyzed using tsunami data. In 1854, 1944/46, the initial rupture were starting from the Tonankai seismogenic zone ahead of the Nankai seismogenic zone with intervals of 32 hours and 2years in each event. The simulation results of recurrence cycle is consisted with recent historical events in 1854,1944/46. Therefore, based on these researches, we will deploy the advanced ocean floor network around the Tonankai seismogenic zone to monitor the crustal activity, improve the recurrence cycle model and provide the high quality early warning information for the next mega-thrust earthquake.","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127760397","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}

引用次数: 7

Pure Yaw Experiments on a Series of Hull Forms for an Underwater Vehicle: Hydrodynamic Observations and Analysis 一系列水下航行器船体形式的纯偏航实验:水动力观察与分析

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370769

F. Azarsina, C. Williams, M. Issac

引用次数: 3

Compensation behaviors in echolocating bats measured by a telemetry microphone during flight 用遥测麦克风测量蝙蝠在飞行过程中的补偿行为

2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies Pub Date : 2007-04-17 DOI: 10.1109/UT.2007.370757

S. Hiryu, T. Hagino, Y. Shiori, H. Riquimaroux, Y. Watanabe

{"title":"Compensation behaviors in echolocating bats measured by a telemetry microphone during flight","authors":"S. Hiryu, T. Hagino, Y. Shiori, H. Riquimaroux, Y. Watanabe","doi":"10.1109/UT.2007.370757","DOIUrl":"https://doi.org/10.1109/UT.2007.370757","url":null,"abstract":"Some echolocating bat species are well known to compensate for the Doppler shifts in the echoes by changing their pulse frequencies so that the echo frequencies remain constant at which the bats can hear best. This behavior is termed \"Doppler-shift compensation\" and is an important behavioral adaptation for echolocating bats. In this study, we present the evidence for another compensation mechanism of echolocating bats, in which pulse intensity is adjusted in relation to the distance to a target resulting in maintenance of a constant intensity of the echo. Our custom-made telemetry microphone (Telemike) mounted on the back of the bat allowed us to observe not only the emitted pulses, but also the returning echoes which the flying bat actually listened to. The signal characteristics of pulse-echo pairs were analyzed combining with a high-speed video camera system as a bat flying toward the wall on which a landing mesh was attached in the flight chamber. We found that pulse intensity in bats intending to land exhibited a marked decrease by approximately 30 dB within 2 m of distance from the target wall, and the mean reduction rate was 6.5 dB per halving of distance. In contrast, the intensity of echoes returning from the target wall at the head of the flying bat indicated a nearly constant intensity while approaching the target wall. These findings provide direct evidence that bats are supposed to adjust pulse intensity to compensate for changes in echo intensity to maintain a constant intensity within the range necessary for optimal signal processing (echo-intensity compensation).","PeriodicalId":345403,"journal":{"name":"2007 Symposium on Underwater Technology and Workshop on Scientific Use of Submarine Cables and Related Technologies","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128470492","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}

引用次数: 1