Proceedings OCEANS最新文献

{"title":"Three-Dimensional Effluent Tracing Techniques For Pollutant Dispersion Monitoring","authors":"D. Hodgins","doi":"10.1109/OCEANS.1989.586735","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.586735","url":null,"abstract":"INSTRUMENTATION Coup l ing a V a r i o s e n s i n s i t u f l u o r o m e t e r and G u i l d l i n e CTD w i t h a compute r i zed d a t a a c q u i s i t i o n and p o s i i t i o n i n g s y s t e m h a s p r o v i d e d a new i n s t r u m e n t f o r m a p p i n g e f f l u e n t p l u m e s i n 3 d i m e n s i o n s u s i n g d y e t r a c i n g methods. The pr irnary s a m p l i n g s t r a t e g y i n v o l v e s t r a n s e c t i n g t h e p l u m e a t s p e e d s o f 3 t o 5 k n o t s w h i l e c y c l i n g t h e i n s t r u m e n t v e r t i c a l l y t h r o u g h t h e d y e c l o u d , t h u s d e l i n e a t i n g b o t h v e r t i c a l a n d h o r i z o n t a l boundar i e s . Grouping a l l t r a n s e c t d a t a i n t o s p e c i f i c t i m e p e r i o d s a n d c o n t o u r i n g d y e c o n c e n t r a t i o n a t s e l e c t e d t h r e s h o l d s y i e l d s t h e d e s i r e d 3-D r e p r e s e n t a t i on . The sys t em (named TRACER) h a s been s u c c e s s f u l l y used t o mon i to r s eabed c o n t a c t a r e a s , t h e n e t d i r e c t i o n a n d r a t e o f d i s p e r s i o n , a n d e f f e c t i v e d i l u t i o n of d i f f u s e r p lumes €or sewage and p u l p m i l l e f f l u e n t d i s p o s a l i n m a r i n e a r e a s . INTRODUCTION One o f t h e main p rob lems i n a s s e s s i n g e f f l u e n t impac t s i n v o l v e s o b t a i n i n g a n a c c u r a t e 3 -d imens iona l mapping oE t h e s u b s t a n c e a s i t d i s p e r s e s i n t h e r e c e i v i n g waters . A mapping o f t h i s n a t u r e p r o v i d e s q u a n t i t a t i v e informat i o n on s e a b e d / s h o r e l i n e c o n t a c t a r e a s , t h e n e t d i r e c t i o n and r a t e o f a d v e c t i o n , t h e s h a p e a n d p o s i t i o n o f t h e e f f l u e n t plume f o l l o w i n g d i s c h a r g e , and e s t i m a t e s o f t h e e f f e c t i v e d i l u t i o n . These a r e i m p o r t a n t pa ra m e t e r s f o r p l a n n i n g and c a r r y i n g o u t w a t e r q u a l i t y and b e n t h i c s a m p l i n g p r o g r a m s , a n d f o r a s s e s s i n g t h e pe r fo rmance of submar ine o u t f a l l s . E f f l u e n t d i s p e r s i o n s t u d i e s u s i n g f l u o r e s c e n t d y e s , s u c h a s Rhodamine WT, a r e o f t e n u s e d i n a n a t t e m p t t o m e a s u r e t h e s e p a r a m e t e r s . However , p r o f i l e m e a s u r e m e n t s made w i t h pumped s a m p l i n g s y s t e m s a r e s l o w a n d l a b o r i o u s to c a r r y o u t , g e n e r a l l y y i e l d too few d a t a t o d e l i n e a t e t h e p l u m e a s i t d i s p e r s e s , a n d a r e c o n s t r a i n e d to s h a l l o w sampl ing . To overcome t h e s e l i m i t a t i o n s , a r a p i d s a m p l i n g i n s i t u f l u o r o m e t e r a n d a G u i l d l i n e CTD i n a V-wing t o w f i s h was c o u p l e d w i t h a r e a l time d a t a a c q u i s i t i o n and p o s i t","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114353699","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}

{"title":"Pattern Recognition Methods For Extracting Information From Geophysical Data Suites","authors":"E. Nyland, L. Le, X. Wu","doi":"10.1109/OCEANS.1989.587483","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.587483","url":null,"abstract":"The results of geophysical experiments such as reflection seismic surveys, multiple sensor well logging, and monitoring of seismic activity can be organised as pseudo images whose lines consist of the values recorded by particular sensors. Such images consist of a complex but usually nonrandom background and a signal whose nature and cause may be poorly understood. In spite of these difficulties such signals can be extracted by a combination of string to string matching techniques and careful organisation of heuristic knowledge available for the system. In the case of seismic reflection data the seismic traces are represented as a sequence of peaks which are compared from one trace to the next. Detected matches can be collected into seismic events and these events can be associated by clustering techniques with strata. The primitives for well logs are linear segments of the logs. They are converted to a geologic description by a form of codification of contact recognition rules and automated comparison with a type response. Similar approaches may work for the analysis of nonlinear systems such as earthquake generating zones.","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114802413","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}

{"title":"A Microwave Technique For Measuring Surface Tension","authors":"P. Wallenberger","doi":"10.1109/OCEANS.1989.587163","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.587163","url":null,"abstract":"Problem addressed: Films on the ocean surface affect gas transport at the air-sea interface, damp capillary waves thus influencing radar returns and light scattering, and are indicators of biological activity and pollution. The presence of a film causes changes in surface tension of films on water. However, 'classical' methods for measuring surface tension involve breaking the surface (and often the film) by inserting a plate or ring, or by taking a sample and forming drops. Therefore non-contact methods for measuring surface tension are desirable.","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117314230","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}

{"title":"A Systolic Computer Architecture For Spectrum Analysis","authors":"F. el-Hawary, T. Richards","doi":"10.1109/OCEANS.1989.587480","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.587480","url":null,"abstract":"","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"334 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123395781","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}

{"title":"Some Aspects on the Knowledge-Based Underwater Systems","authors":"M. Nayak","doi":"10.1109/OCEANS.1989.586681","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.586681","url":null,"abstract":"","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123461216","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}

{"title":"Design Of An Acoustic Doppler Current Profiler Test Unit","authors":"D. Belliveau, J. Whitman","doi":"10.1109/OCEANS.1989.587072","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.587072","url":null,"abstract":"","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"433 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123605593","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}

{"title":"In search of the Denny regrade: Fate of a Large Spoil bank in Elliott bay, Puget sound","authors":"R. Loeffler, M. Holmes, R. Sylwester","doi":"10.1109/OCEANS.1989.592822","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.592822","url":null,"abstract":"A large shoal located approximately 800 ft ( 2 5 0 m) off Seattle’s waterfront along the northeast shore of Elliott Bay in Puget Sound is attributed to offshore dunping of material from the Denny Hill Regrade, which occurred in two phases between 1898 and 1 9 3 1 . A compilation of hydrographic surveys dating from 1875 to 1 9 7 0 , together with recent marine geophysical data, 3 show the developnent of a bank and as ociated flank deposits whose v o l m ( 8 . 9 million yd / 6 . 8 million m ) canpares closely with that of estimates of the amount of materia3 removed durinfi the regrading operation ( 1 0 million yd / 7 . 6 million m ). Seismic records and available bottom samples suggest that the spoil bank is covered in places by a thin mantle of modern sediment, and that slunping of the steep flanks of the bank is contributing material to the central submarine valley in Elliott Bay. This spoil bank is being studied to determine its role and relationship to sediment distribution patterns and transport mechanisms in Elliott Bay. 5,","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"403 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122120869","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}

{"title":"Submergence Depth Control of a Free-Fall Submersible Escape Capsule for an Offshore Oil Rig","authors":"M. Hinchey, R. Goteti","doi":"10.1109/OCEANS.1989.586670","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.586670","url":null,"abstract":"This paper describes some exploratory work on a new evacuation system for an offshore oil rig. The proposed system would free-fall to the ocean surface and then sink down to a level where water motions are insignificant. So, in severe storms, it would avoid the violent air and water motions that exist near the surface. The paper concentrates on the control features needed to make the escape capsule hover at a certain depth below the surface. The describing function concept of classical automatic control theory is used to study the performance of a number of control strategies. Comparisons with data from a simple experiment show reasonable qualitative agreement. For the experiment, a spherical capsule was constructed and a digital computer was used to sense depth error and take corrective action by adjusting an air flow into or out of a central buoyancy chamber.","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"252 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120878347","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}

{"title":"An Engineering Method to Predict Propeller Loads on Maneuvering Underwater Vehicles","authors":"K. Watson","doi":"10.1109/OCEANS.1989.586679","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.586679","url":null,"abstract":"An engineering method is presented for calculating propeller shaft loads on a maneuvering underwater vehicle. The method predicts time-averaged loads on apropeller in nonuniform, inclined flow. The computational affordability of the method makes it ideal for use in preliminary vehicle design. Comparisons of measured and predicted data for propeller alone and propeller-hull configurations show that the method accounts for the effect of nonuniform and inclined flow on shaft loads. INTRODUCTION A propeller influences the hydrodynamic performance of an underwater vehicle through direct and indirect loads. Direct loads, consisting of thrust, torque, lift, and side forces are transmitted to the hull through the shaft. Indirect loads are caused by the propeller-induced flow on the stem and tail fins. Because the propeller operates in the nonuniform flow field of the vehicle, propeller loads typically contain time-averaged and harmonic components. This paper considers direct, time-averaged loads only. Methods to predict direct propeller loads range from empirical to advanced numerical methods. The Hydrodynamic Analysis Techniques (HYDAT) program is a reliminary design tool for towed and free-swimming submersibles? HYDAT predicts propeller loads using an empirical method based on open water performance data for a particular propeller series. Further development of this and other empirical methods has been hampered by the lack of data. Potential flow-ba~edmethods~~~ are capable ofpredictingpropellerloads, given the geometry and inflow conditions. These methods have been successfully used to design propellers, but they are large and difficult to run on a production basis. Semi-empirical methods are available to predict propeller loads, given the open water performance characteristics of the propeller. McCarthy4 developed a method to predict the thrust and torque of an arbitrary propeller operating in a nonuniform but noninclined flow. McCarthy's method accounts for the substantial effect of the axisymmetric hull boundary layer on propeller thrust and torque. G~tsche~developed amethodto predictthe thrust, torque, andinplane normal force of a propeller in a uniform, inclined flow. A method developed by Perkins and Mendenhal16 combines the McCarthy and Gutsche methods, providing a means to compute direct loads in a nonuniform, inclined flow. This method is capable of predicting the three forces and three moments acting on a propeller attached to a maneuvering vehicle. For use in preliminary vehicle design, semi-empirical methods offer the most flexible and affordable approach for propeller load prediction. This paper presents a semi-empirical method based on the work of Perkins and MendenhalL6 The following sections describe the procedure for calculating the propeller inflow and load components. Predictions are compared with measured shaft loads on propeller alone and propeller-hull configurations. TECHNICAL APPROACH The propeller model, designated PROPLD, com","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124764531","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}

{"title":"Experiences With The KVH Compass In RD Instruments Acoustic Doppler Current Profilers","authors":"R. E. Schramm","doi":"10.1109/OCEANS.1989.587073","DOIUrl":"https://doi.org/10.1109/OCEANS.1989.587073","url":null,"abstract":"","PeriodicalId":331017,"journal":{"name":"Proceedings OCEANS","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129896992","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}