Oceans '97. MTS/IEEE Conference Proceedings最新文献_第4页

Design of an elastic mooring for remote turbidity monitoring buoys 远程浊度监测浮标弹性系泊设计

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634350

H.O. Berteaux, B.G. Petolas

{"title":"Design of an elastic mooring for remote turbidity monitoring buoys","authors":"H.O. Berteaux, B.G. Petolas","doi":"10.1109/OCEANS.1997.634350","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634350","url":null,"abstract":"In December 1996, the Greater Vancouver Water District (GVWD) contracted to METOCEAN the design and development of special, instrumented buoy systems to remotely monitor changes in fresh water turbidity of city reservoirs in the vicinity of Vancouver, British Columbia, Canada. Typically, these buoy systems consist of a central buoy supporting an RF telemetry link and a data line with two turbidity sensors located one near the surface and one near the reservoir bottom. This buoy is held on station with an elastic bi-moor. Three smaller buoys to service the data line and set/recover the bi-moor legs complete the system. This paper first reviews the environmental requirements and specified design criteria. The large range of water level variations, the necessity for providing clear spacing under the telemetry buoy for the sensors and the data line, and the presence of occasional strong currents at the time of gate openings, led to the selection of a bi-moor as the most desirable mooring configuration. Rationales for the selection of a compound mooring partly made of elastic cord and partly made of chain to fabricate the bi-moor legs. Methods of analysis for their design, and description of the main components of these moorings are nest presented. The paper then addresses the telemetry components of the system. Data are collected from the turbidity sensors and telemetered via RF link to a receiving station at the reservoir dam. These data are then transferred to the GVWD SCADA system for evaluation and action as required. The implementation of the bi-moor and associated service buoys required careful planning and execution which are summarized nest. Finally, the paper concludes with a short description of other potential applications for similar buoy systems.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131331736","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: 0

Moored acoustic Doppler current profiler data reduction and database applications 系泊声学多普勒电流剖面仪数据还原和数据库应用

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634376

B.A. Leybourne, K. Cranford, A. Morales

引用次数: 0

Detecting small seabed targets using a high frequency multibeam sonar: geometric models and test results 利用高频多波束声纳探测海底小目标:几何模型和试验结果

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624099

M. Brissette, J. Hughes-Clarke, J. Bradford, B. MacGowan

{"title":"Detecting small seabed targets using a high frequency multibeam sonar: geometric models and test results","authors":"M. Brissette, J. Hughes-Clarke, J. Bradford, B. MacGowan","doi":"10.1109/OCEANS.1997.624099","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.624099","url":null,"abstract":"The detection of small seabed targets has predominantly been achieved through the use of deep-towed side scan sonar technology. The target cannot be relied on to have distinctive backscatter strength but usually lies proud of the seabed, thus casting a shadow. Such technology fails at higher grazing angles where shadows are no longer cast. Thus repetitive, overlapping survey geometries are required to fill the \"nadir gap\". An alternate technology that can detect topographic anomalies without relying on shadows is high frequency multibeam sonars (HFMS). If such systems can be combined with side scan methods, target search times can be considerably reduced. Traditionally HFMS sonars have been hull mounted and thus are not able to resolve small (<1.5 m) targets in continental shelf water depths (30-200 m). If such sonars were deployed on tow bodies however, small target detection at high grazing angles may be feasible. To this end, we have investigated the capability of one of these sonars using altitudes between 10 and 30 m (as might be achieved by mounting such a sonar on terrain-following tow fish). Our preliminary modelling suggests that the beam footprints (using 1.5 degree beam) and the beam sounding density are potentially sufficient to achieve the required objective. We identified two limiting conditions. We compared the results of our modelling with actual data taken from a small survey launch in water depths between 10 and 30 m using targets ranging in size from a few decimetres to 1.5 metres.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"9 44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114709279","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: 9

Investigation of estuarine turbulent flow and suspended sediment structures using high resolution coherent Doppler current profilers and a Sontek ADV ocean probe 利用高分辨率相干多普勒洋流剖面仪和Sontek ADV海洋探测器研究河口湍流和悬浮沉积物结构

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634421

P. Hardcastle

引用次数: 2

Noise suppression and component extraction of underwater acoustic signals 水声信号的噪声抑制与成分提取

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624192

G. Thomas, A. E. Brito

引用次数: 7

Deconvolution for transient classification using fourth order statistics 基于四阶统计量的瞬态分类反卷积

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634404

M. Broadhead, L. A. Pflug

引用次数: 2

A wave powered profiler for long term monitoring 用于长期监测的波浪动力剖面仪

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634366

G. Fowler, J. M. Hamilton, B. Beanlands, D. Belliveau, A. Furlong

{"title":"A wave powered profiler for long term monitoring","authors":"G. Fowler, J. M. Hamilton, B. Beanlands, D. Belliveau, A. Furlong","doi":"10.1109/OCEANS.1997.634366","DOIUrl":"https://doi.org/10.1109/OCEANS.1997.634366","url":null,"abstract":"The collection of periodic profiles of oceanographic data at specific sites is a critical component of oceanographic monitoring programs. Typically, this type of work is completed by lowering instrumentation from ships but the cost of these operations has often meant that the temporal and spatial coverage of these surveys is less than ideal. As an alternative, moored profilers have been developed but the energy required to move a substantial package up and down a mooring wire can represent a major limitation. A simple, economical and autonomous device to accomplish the task of completing a large number of profiles in a moored or drifting configuration has been developed at the Bedford Institute of Oceanography. This system overcomes the limitation of previous self-contained profiling devices by deriving the power needed to move vertically in the water column from the energy of surface waves. A one way clamp provides the mechanism by which wave action acting on a surface float sends a buoyant instrument package down a mooring line. Once at the bottom and when a profile is desired, the clamp is released allowing the instrument to float to the surface. Some data from field trials as well a description of the principle of operation of the device are presented.","PeriodicalId":259593,"journal":{"name":"Oceans '97. MTS/IEEE Conference Proceedings","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124043784","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: 18

Synthesis of aperiodic planar arrays by a stochastic approach 用随机方法合成非周期平面阵列

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624100

A. Trucco

引用次数: 13

Error correction coding for communication in adverse underwater channels 不利水下信道通信的纠错编码

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.624106

M. Green, J. Rice

引用次数: 9

Near realtime use of RADARSAT SAR imagery combined with AVHRR images for ship navigation in Antarctica 近实时使用RADARSAT SAR图像结合AVHRR图像在南极洲的船舶导航

Oceans '97. MTS/IEEE Conference Proceedings Pub Date : 1997-10-06 DOI: 10.1109/OCEANS.1997.634326

P. Danduran, R. Garello, M. Mouchot, D. Fleury, I. Thepauts

引用次数: 6