OCEANS'11 MTS/IEEE KONA最新文献_第7页

A low-cost calibration facility for high-frequency acoustic backscatter instruments 一种低成本的高频声波后向散射仪器校准设备

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107268

D. Lemon, M. Clarke, P. Johnston, J. Buermans, M. Taillefer

{"title":"A low-cost calibration facility for high-frequency acoustic backscatter instruments","authors":"D. Lemon, M. Clarke, P. Johnston, J. Buermans, M. Taillefer","doi":"10.23919/OCEANS.2011.6107268","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107268","url":null,"abstract":"Full-system calibration of acoustic instruments used to measure high-frequency backscatter from zooplankton and small fish in the ocean is required if the data are to be used to estimate biomass and populations from signals at different frequencies. Here we describe a test tank facility for calibrating high-frequency, narrow-band sonars operating at one or more frequencies from 125 kHz to 775 kHz and with beam-widths between 1.8 and 11 degrees. The all steel tank is cylindrical with a diameter of 2.43 metres and a length of 6.10 metres and holds 28.5 cubic metres of water. The absorbing material on the end wall is a coarse artificial turf which is easily available at minimal cost and reduces high-frequency reverberations in the tank to negligible levels after 6 reflections. Pulsed operation at pinging rates up to 10 Hz is therefore possible without interference from reverberations. Echoes from the target are recorded over a series of pings; the difference between the target strength computed from the mean of those echoes and the known target strength is a measure of the accuracy of the nominal instrument response calculated from the manufacturer's transducer characteristics and bench measurements of the system electronics, and therefore allows a calibration correction to be made. An acoustic propagation model of the tank has also been developed to characterize the response of instruments placed in it and to identify optimum target placements.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"12 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81438354","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

A framework for sea level rise vulnerability assessment for southwest U.S. military installations 美国西南军事设施海平面上升脆弱性评估框架

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107212

B. Chadwick, R. Flick, J. Helly, T. Nishikawa, P. Wang, W. O'Reilly, R. Guza, P. Bromirski, A. Young, W. Crampton, B. Wild, Issac Canner

{"title":"A framework for sea level rise vulnerability assessment for southwest U.S. military installations","authors":"B. Chadwick, R. Flick, J. Helly, T. Nishikawa, P. Wang, W. O'Reilly, R. Guza, P. Bromirski, A. Young, W. Crampton, B. Wild, Issac Canner","doi":"10.23919/OCEANS.2011.6107212","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107212","url":null,"abstract":"We describe an analysis framework to determine military installation vulnerabilities under increases in local mean sea level as projected over the next century. The effort is in response to an increasing recognition of potential climate change ramifications for national security and recommendations that DoD conduct assessments of the impact on U.S. military installations of climate change. Results of the effort described here focus on development of a conceptual framework for sea level rise vulnerability assessment at coastal military installations in the southwest U.S. We introduce the vulnerability assessment in the context of a risk assessment paradigm that incorporates sources in the form of future sea level conditions, pathways of impact including inundation, flooding, erosion and intrusion, and a range of military installation specific receptors such as critical infrastructure and training areas. A unique aspect of the methodology is the capability to develop wave climate projections from GCM outputs and transform these to future wave conditions at specific coastal sites. Future sea level scenarios are considered in the context of installation sensitivity curves which reveal response thresholds specific to each installation, pathway and receptor. In the end, our goal is to provide a military-relevant framework for assessment of accelerated SLR vulnerability, and develop the best scientifically-based scenarios of waves, tides and storms and their implications for DoD installations in the southwestern U.S.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"31 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90894174","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: 3

Frequency and polarization peculiarities of water surface radar cross section and brightness temperature angular dependences and their changes due to clouds and rain 水面雷达横截面和亮温角依赖的频率和偏振特性及其在云和雨下的变化

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6106901

A. Arakelyan, A. Hambaryan, A. Arakelyan, M. Grigoryan, V. Karyan, G. Hovhannisyan

引用次数: 2

Modeling and nonlinear heading control for sailing yachts 帆船建模与非线性航向控制

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107004

Lin Xiao, J. Jouffroy

引用次数: 40

Heat exchanger development for Ocean Thermal Energy Conversion 海洋热能转换换热器的研制

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107175

Michael Eldred, J. Van Ryzin, S. Rizea, In Chieh Chen, R. Loudon, N. Nagurny, S. Maurer, E. Jansen, A. Plumb, Michael R. Eller, Victor R. R. Brown

引用次数: 4

Making United States Integrated Ocean Observing System (U.S. IOOS) inclusive of marine biological resources 使美国综合海洋观测系统(U.S. IOOS)包括海洋生物资源

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6106922

H. Moustahfid, J. Potemra, P. Goldstein, R. Mendelssohn, A. DesRochers

{"title":"Making United States Integrated Ocean Observing System (U.S. IOOS) inclusive of marine biological resources","authors":"H. Moustahfid, J. Potemra, P. Goldstein, R. Mendelssohn, A. DesRochers","doi":"10.23919/OCEANS.2011.6106922","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6106922","url":null,"abstract":"An important Data Management and Communication (DMAC) goal is to enable a multi-disciplinary view of the ocean environment by facilitating discovery and integration of data from various sources, projects and scientific domains. United States Integrated Ocean Observing System (U.S. IOOS) DMAC functional requirements are based upon guidelines for standardized data access services, data formats, metadata, controlled vocabularies, and other conventions. So far, the data integration effort has focused on geophysical U.S. IOOS core variables such as temperature, salinity, ocean currents, etc. The IOOS Biological Observations Project is addressing the DMAC requirements that pertain to biological observations standards and interoperability applicable to U.S. IOOS and to various observing systems. Biological observations are highly heterogeneous and the variety of formats, logical structures, and sampling methods create significant challenges. Here we describe an informatics framework for biological observing data (e.g. species presence/absence and abundance data) that will expand information content and reconcile standards for the representation and integration of these biological observations for users to maximize the value of these observing data. We further propose that the approach described can be applied to other datasets generated in scientific observing surveys and will provide a vehicle for wider dissemination of biological observing data. We propose to employ data definition conventions that are well understood in U.S. IOOS and to combine these with ratified terminologies, policies and guidelines.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"12 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87940222","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

Low altitude AUV terrain navigation using an interferometric sidescan sonar 使用干涉式侧扫描声纳的低空水下航行器地形导航

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107003

Ove Kent Hagen, Kjetil Bergh Ånonsen, T. O. Saebo

引用次数: 14

Phosphate: Chatham Rise, New Zealand 磷酸盐:新西兰查塔姆高地

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6106986

R. Falconer, Chris Castle, Campbell McKenzie

引用次数: 0

Assessment of HYCOM as a tool for estimating Florida's OTEC potential 评估HYCOM作为估计佛罗里达州OTEC潜力的工具

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107134

James H. VanZwieten, L. Rauchenstein, H. Hanson, M. Dhanak

引用次数: 2

The importance of mooring line model fidelity in floating wind turbine simulations 系泊线模型保真度在浮式风力机仿真中的重要性

OCEANS'11 MTS/IEEE KONA Pub Date : 2011-12-19 DOI: 10.23919/OCEANS.2011.6107138

M. Hall, B. Buckham, C. Crawford, R. Nicoll

{"title":"The importance of mooring line model fidelity in floating wind turbine simulations","authors":"M. Hall, B. Buckham, C. Crawford, R. Nicoll","doi":"10.23919/OCEANS.2011.6107138","DOIUrl":"https://doi.org/10.23919/OCEANS.2011.6107138","url":null,"abstract":"Accurate computer modelling is critical in achieving cost effective floating offshore wind turbine designs. In floating wind turbine simulation codes, mooring line models often employ a quasi-static approximation that neglects mooring line inertia and hydrodynamics. The loss of accuracy from using this approach has not been thoroughly quantified. To test whether this widely-used simplified mooring line modelling approach is adequate, the open-source floating wind turbine simulator FAST was modified to allow the use of an alternative, fully dynamic, mooring model based on the hydrodynamics simulator ProteusDS. The OC3-Hywind floating wind turbine design was implemented in this newly-coupled simulator arrangement and tested using a variety of regular wave conditions. The static equivalence between the built-in quasi-static mooring model and the newly-coupled dynamic mooring model is very good. Tests using both models were performed looking at scenarios of the response of the system in still water and the response to regular waves and steady winds. The dynamic mooring model significantly increased the overall platform damping in translational DOFs during motion decay tests in still water. There was very little difference between the models in coupled tests where regular wave excitation was the primary driver of platform motions, except for the addition of small levels of power in the higher frequencies of the platform motion spectrum. The nature of the different tests suggests that it is only in situations where the platform motions and wave velocities are not synchronized that the damping from the dynamic mooring model makes a large difference. This points to irregular wave conditions as providing a better test of the differences between mooring models.","PeriodicalId":19442,"journal":{"name":"OCEANS'11 MTS/IEEE KONA","volume":"49 2 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2011-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75860213","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: 10