The International Journal of Ocean and Climate Systems最新文献_第5页

Real Time Wave Forecasting Using Wind Time History and Genetic Programming 利用风时历史和遗传规划进行实时波浪预测

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.249

A. Kambekar, M. C. Deo

{"title":"Real Time Wave Forecasting Using Wind Time History and Genetic Programming","authors":"A. Kambekar, M. C. Deo","doi":"10.1260/1759-3131.5.4.249","DOIUrl":"https://doi.org/10.1260/1759-3131.5.4.249","url":null,"abstract":"The significant wave height and average wave period form an essential input for operational activities in ocean and coastal areas. Such information is important in issuing appropriate warnings to people planning any construction or instillation works in the oceanic environment. Many countries over the world routinely collect wave and wind data through a network of wave rider buoys. The data collecting agencies transmit the resulting information online to their registered users through an internet or a web-based system. Operational wave forecasts in addition to the measured data are also made and supplied online to the users. This paper discusses operational wave forecasting in real time mode at locations where wind rather than wave data are continuously recorded. It is based on the time series modeling and incorporates an artificial intelligence technique of genetic programming. The significant wave height and average wave period values are forecasted over a period of 96 hr in future from the observations of wind speed and directions extending to a similar time scale in the past. Wind measurements made by floating buoys at eight different locations around India over a period varying from 1.5 yr to 9.0 yr were considered. The platform of Matlab and C++ was used to develop a graphical user interface that will extend an internet based user-friendly access of the forecasts to any registered user of the data dissemination authority.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123691202","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: 5

Management of Coastal Erosion Using Remote Sensing and GIS Techniques (SE India) 利用遥感和GIS技术管理海岸侵蚀(印度东南部)

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.211

S. Saravanan, N. Chandrasekar, M. Rajamanickam, C. Hentry, V. Joevivek

{"title":"Management of Coastal Erosion Using Remote Sensing and GIS Techniques (SE India)","authors":"S. Saravanan, N. Chandrasekar, M. Rajamanickam, C. Hentry, V. Joevivek","doi":"10.1260/1759-3131.5.4.211","DOIUrl":"https://doi.org/10.1260/1759-3131.5.4.211","url":null,"abstract":"World wide, coastal erosion is recognized as a great threat for beach environment. Total control of coastal erosion is not feasible but it should not be ignored and needs timely management. Erosional activities have been significantly noticed along the coastal tract of Vembar and Kallar (Kallurani), South India. An attempt has been made here to delineate different zones based on their sand budget and erosion rate. Linear Imaging Self Scanning Sensor (LISS) III 2001 and Linear Imaging Self Scanning Sensor III and PAN merged data of the year 2001 have been utilized to identify the coastal geomorphological features, shoreline changes and river course changes. A Geographic Information System (GIS) software namely ArcGIS (9.1) has been used as a tool to delineate the coastal erosion hazard for proper planning and management of coastal developments. Beach profile studies have shown significant variation in the beach morphology. The study area has been categorized into five different zones in the GIS analysis based on the degree of coastal erosion and sediment dynamics namely (i) very high - Kalaignanapuram, (ii) high - Sippikulam (iii) medium - Periyasamypuram (iv) low - Vembar and Kallar (Kallurani) (v) very low - Pachayapuram.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130681748","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: 14

Forecasting Sea Water Levels at Mukho Station, South Korea Using Soft Computing Techniques 利用软计算技术预测韩国Mukho站的海平面

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.175

O. Kisi, S. Karimi, J. Shiri, Oleg Makarynskyy, Heesung Yoon

引用次数: 15

Experimental Studies on a Scaled Model of a Tension Based Tension Leg Platform under Combined Mooring and Tether Conditions 系泊与系绳结合条件下张力腿平台比例模型试验研究

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.199

D. S. B. Rao, R. Selvam, N. Srinivasan

引用次数: 0

Wave Forecasting Using Neuro Wavelet Technique 基于神经小波技术的波浪预测

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.237

P. Dixit, S. Londhe, Y. Dandawate

{"title":"Wave Forecasting Using Neuro Wavelet Technique","authors":"P. Dixit, S. Londhe, Y. Dandawate","doi":"10.1260/1759-3131.5.4.237","DOIUrl":"https://doi.org/10.1260/1759-3131.5.4.237","url":null,"abstract":"In the present work a hybrid Neuro-Wavelet Technique is used for forecasting waves up to 6 hr, 12 hr, 18 hr and 24 hr in advance using hourly measured significant wave heights at an NDBC station 41004 near the east coast of USA. The NW Technique is employed by combining two methods, Discrete Wavelet Transform and Artificial Neural Networks. The hourly data of previously measured significant wave heights spanning over 2 years from 2010 and 2011 is used to calibrate and test the models. The discrete wavelet transform of NWT analyzes frequency of signal with respect to time at different scales. It decomposes time series into low (approximate) and high (detail) frequency components. The decomposition of approximate can be carried out up to desired multiple levels in order to provide more detail and approximate components which provides relatively smooth varying amplitude series. The neural network is trained with decorrelated approximate and detail wavelet coefficients. The outputs of networks during testing are reconstructed back using inverse DWT. The results were judged by drawing the wave plots, scatter plots and other error measures. The developed models show reasonable accuracy in prediction of significant wave heights from 6 to 24 hours. To compare the results traditional ANN models were also developed at the same location using the same data and for same time interval.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126237071","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: 5

A Field Study of Atmospheric Icing Analysis in a Complex Terrain of the High North 高北复杂地形大气结冰分析的野外研究

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.189

Taimur Rashid, U. Mughal, Mohamed Y. Mustafa, M. S. Virk

{"title":"A Field Study of Atmospheric Icing Analysis in a Complex Terrain of the High North","authors":"Taimur Rashid, U. Mughal, Mohamed Y. Mustafa, M. S. Virk","doi":"10.1260/1759-3131.5.4.189","DOIUrl":"https://doi.org/10.1260/1759-3131.5.4.189","url":null,"abstract":"Analyses of atmospheric icing events hold the key for computing the significant parameters leading to icing load calculations. In the cold regions of the high north, atmospheric icing loads on structures become important when it comes to design and safety of infrastructures. Furthermore, icing load calculations over a certain period of time provide a vital input for designers to improve the safety of structures. Patterns of icing events can be evaluated in correlation with other meteorological parameters such as atmospheric temperature, relative humidity and wind speed to better estimate icing loads. A field study has been performed in the complex terrain of northern Norway, by the atmospheric icing research team of Narvik University College, where customized meteorological atmospheric ice monitoring stations were installed to study atmospheric icing events in relation with the associated weather parameters. The meteorological parameters of three different sites in the vicinity of Narvik (68°25′14′ N17°33′36′ E) were collected, sorted, averaged to standardized timeline and further validated with recordings of weathers parameters obtained from the national weather forecasts, where a good agreement was found. Analyses were mainly performed between accreted ice loads and associated meteorological parameters. The results presented can be used as base for the development of more detailed mathematical models for the better prediction of atmospheric icing events in complex terrains.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129246243","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

Estimation of Significant Wave Heights Using Numerical and Neural Techniques and Comparison with Buoy and Satellite Observations 利用数值和神经技术估算有效浪高，并与浮标和卫星观测比较

The International Journal of Ocean and Climate Systems Pub Date : 2014-12-01 DOI: 10.1260/1759-3131.5.4.223

J. Vimala, G. Latha, R. Venkatesan

引用次数: 5

Experimental Investigations of Acceleration on Slender Cylindrical Member under Breaking Waves 破碎波作用下细长圆柱构件加速度的实验研究

The International Journal of Ocean and Climate Systems Pub Date : 2014-09-01 DOI: 10.1260/1759-3131.5.3.117

R. Manjula, S. Sannasiraj, K. Palanichamy

{"title":"Experimental Investigations of Acceleration on Slender Cylindrical Member under Breaking Waves","authors":"R. Manjula, S. Sannasiraj, K. Palanichamy","doi":"10.1260/1759-3131.5.3.117","DOIUrl":"https://doi.org/10.1260/1759-3131.5.3.117","url":null,"abstract":"Many of the coastal and offshore structures consist of slender cylindrical member as the fundamental component. Since the structural damages and failures are catastrophic under wave impact, it is essential to understand the influence of breaking wave impact on the structural members. Past literature dictates that the magnitude of impact pressures is of the order of ten times more than the non breaking wave induced pressure. The standard codal provisions for the structural design of those members under breaking wave impact are scarce. In the present study, an experimental investigation has been carried out to measure the response of the slender vertical cylinder under breaking waves. Acceleration measurements were made under the incidence of breaking waves of different intensities varying from Plunging to Spilling. Deflections are found out from the measured acceleration. The maximum acceleration observed under severe plunging event is 0.5 times that of moderate plunging event, the deflection induced by the moderate plunging is two order higher than that of severe plunging. Acceleration is maximum not only above still water level (SWL) but also lies in the impact zone. Hence moderate plunging events with higher impulse and larger pressure rise time is crucial in the design of offshore and coastal structural member under breaking wave impact load.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"2677 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116333972","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: 5

Numerical Modeling Technique for Tracking of Disposed Dredged Material in Offshore Area 近海疏浚废弃物处置跟踪的数值模拟技术

The International Journal of Ocean and Climate Systems Pub Date : 2014-09-01 DOI: 10.1260/1759-3131.5.3.127

V. Shukla, T. Nagendra, N. Sharma

引用次数: 2

Assessment of Kinetic Tidal Energy Resources Using SELFE 基于self的动态潮汐能资源评价

The International Journal of Ocean and Climate Systems Pub Date : 2014-09-01 DOI: 10.1260/1759-3131.5.3.141

M. Behera, P. Tkalich

引用次数: 3