Pub Date : 2015-12-01DOI: 10.1260/1759-3131.6.4.159
S. Karimi, O. Kisi, J. Shiri, Oleg Makarynskyy
The present paper investigates performance of neuro-fuzzy (NF) and wavelet-neuro-fuzzy (WNF)conjunction models in short- and long-term forecasts of air temperature. A NF and two WNF models were developed and validated using daily air temperature data collected at two coastal stations in Iran, namely, Ahwaz and Izeh. The comparison of ANFIS and WANFIS models indicated that the conjunction models performed better than the single ANFIS model especially in forecasting weekly and monthly air temperatures. The coefficient of determination (R2), the root mean square error (RMSE) and adjusted coefficient of efficiency (E1) were used as comparison criteria. For the Ahwaz and Izeh stations, the WANFIS model increased the accuracy of single ANFIS model by 23-13% (Ahwaz) and 21-8% (Izeh) with respect to RMSE in forecasting one-week and one-month ahead maximum air temperatures, respectively.
{"title":"A Wavelet and Neuro-Fuzzy Conjunction Model to Forecast Air Temperature Variations at Coastal Sites","authors":"S. Karimi, O. Kisi, J. Shiri, Oleg Makarynskyy","doi":"10.1260/1759-3131.6.4.159","DOIUrl":"https://doi.org/10.1260/1759-3131.6.4.159","url":null,"abstract":"The present paper investigates performance of neuro-fuzzy (NF) and wavelet-neuro-fuzzy (WNF)conjunction models in short- and long-term forecasts of air temperature. A NF and two WNF models were developed and validated using daily air temperature data collected at two coastal stations in Iran, namely, Ahwaz and Izeh. The comparison of ANFIS and WANFIS models indicated that the conjunction models performed better than the single ANFIS model especially in forecasting weekly and monthly air temperatures. The coefficient of determination (R2), the root mean square error (RMSE) and adjusted coefficient of efficiency (E1) were used as comparison criteria. For the Ahwaz and Izeh stations, the WANFIS model increased the accuracy of single ANFIS model by 23-13% (Ahwaz) and 21-8% (Izeh) with respect to RMSE in forecasting one-week and one-month ahead maximum air temperatures, respectively.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130269523","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}
Pub Date : 2015-12-01DOI: 10.1260/1759-3131.6.4.173
M. Uddin, J. Alam, Z. Khan, G. Hasan, R. Alam
The Meghna Estuary is formed by the combined flows from three great rivers in the south-east Asia; the Ganges, the Brahmaputra and the Meghna. This estuary experiences dynamic hydro-morphological changes due to very high discharge of water and sediment from these three mighty rivers. Erosion and accretion occur simultaneously at very high rates; such that, the flow and sediment discharge through the estuary are the third highest and the highest, respectively, in the world. On the other hand, the tidal current itself is also strongly affected by the dynamic morphology changes. It is thus essential to understand the hydraulic behavior and interactive features of tides and morphology change in the estuary. With this end in view a two dimensional general model of Bay of Bengal was developed under cyclone shelter preparatory study (csps) undertaken by Bangladesh Government and the model was updated later during other projects. The present article focuses on development of model, its set-up, boundary conditions and few calibration results of this two dimensional hydrodynamic and morphology model. The model applications clearly show the variation of the flow structure; their speed and direction separately for monsoon and dry season around the model area which covers the northern part of Bay of Bengal more specifically the Meghna Estuary.
{"title":"Numerical Simulation: Hydro-Morphology of Meghna Estuary","authors":"M. Uddin, J. Alam, Z. Khan, G. Hasan, R. Alam","doi":"10.1260/1759-3131.6.4.173","DOIUrl":"https://doi.org/10.1260/1759-3131.6.4.173","url":null,"abstract":"The Meghna Estuary is formed by the combined flows from three great rivers in the south-east Asia; the Ganges, the Brahmaputra and the Meghna. This estuary experiences dynamic hydro-morphological changes due to very high discharge of water and sediment from these three mighty rivers. Erosion and accretion occur simultaneously at very high rates; such that, the flow and sediment discharge through the estuary are the third highest and the highest, respectively, in the world. On the other hand, the tidal current itself is also strongly affected by the dynamic morphology changes. It is thus essential to understand the hydraulic behavior and interactive features of tides and morphology change in the estuary. With this end in view a two dimensional general model of Bay of Bengal was developed under cyclone shelter preparatory study (csps) undertaken by Bangladesh Government and the model was updated later during other projects. The present article focuses on development of model, its set-up, boundary conditions and few calibration results of this two dimensional hydrodynamic and morphology model. The model applications clearly show the variation of the flow structure; their speed and direction separately for monsoon and dry season around the model area which covers the northern part of Bay of Bengal more specifically the Meghna Estuary.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133372268","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}
Pub Date : 2015-09-01DOI: 10.1260/1759-3131.6.3.113
V. Shakhin, T. V. Shakhina
The work presents new expressions related to wave energy density and flux based on Stokes and cnoidal waves theories. It shows that as progressive waves of finite amplitude propagate a compensatory reverse flow is formed within the bottom fluid layers. The existence of such flow was experimentally confirmed. Modified mathematical models for surface waves over a non-uniform bottom and of a free plane configuration are suggested. A method of calculating the wave transformation and the currents in the surf zone is proposed. Computations made over a wide range of variations in wave parameters are presented.
{"title":"Waves on the Water Surface — Mathematical Models — Part 1","authors":"V. Shakhin, T. V. Shakhina","doi":"10.1260/1759-3131.6.3.113","DOIUrl":"https://doi.org/10.1260/1759-3131.6.3.113","url":null,"abstract":"The work presents new expressions related to wave energy density and flux based on Stokes and cnoidal waves theories. It shows that as progressive waves of finite amplitude propagate a compensatory reverse flow is formed within the bottom fluid layers. The existence of such flow was experimentally confirmed. Modified mathematical models for surface waves over a non-uniform bottom and of a free plane configuration are suggested. A method of calculating the wave transformation and the currents in the surf zone is proposed. Computations made over a wide range of variations in wave parameters are presented.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128060293","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}
Pub Date : 2015-09-01DOI: 10.1260/1759-3131.6.3.137
V. Shakhin, T. V. Shakhina
This is Part 2 of the paper titled: “Waves on water surface — mathematical models”. It deals with the wave transformation above a non-uniform bed surface, treating it as a linear as well as a nonlinear problem.
{"title":"Waves on the Water Surface — Mathematical Models — Part 2","authors":"V. Shakhin, T. V. Shakhina","doi":"10.1260/1759-3131.6.3.137","DOIUrl":"https://doi.org/10.1260/1759-3131.6.3.137","url":null,"abstract":"This is Part 2 of the paper titled: “Waves on water surface — mathematical models”. It deals with the wave transformation above a non-uniform bed surface, treating it as a linear as well as a nonlinear problem.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130551848","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}
Pub Date : 2015-06-01DOI: 10.1260/1759-3131.6.2.55
R. Rao, M. Jitendra, R. Sivakumar, S. Ramakrishna
All the available historic surface marine meteorological data collected from Voluntary Observing Ships (VOS) in the tropical Indian Ocean during the period 1951–2010, archived by National Centre for Atmospheric Research, Boulder, Colorado, USA are assembled, quality controlled, processed and analyzed. Data for all the meteorological parameters stratified into 4° latitude by 1° longitude boxes, over five day durations, for all the 60 years are quality controlled, averaged and analyzed to portray the observed spatio-temporal evolution of all these parameters as Hovmoller diagrams for the Gulf of Aden to Strait of Malacca shipping lane. Two dimensional machine contouring is carried out with appropriate colour shading intensities to highlight the maxima and minima in the analyzed fields. The observed intraseasonal and interannual variability of these parameters is characterized along this shipping lane. These analyzed distributions amply highlight the observed variability of the surface meteorological parameters both on intraseasonal and interannual time scales during 1951–2010. Composites of SST and other marine meteorological parameters for strong and weak ASWP regimes, for strong and weak monsoon years, for El Nino (+1Y) and La Nina (+1Y) years and for Positive and Negative IOD (+1Y) years are presented.
由美国科罗拉多州博尔德国家大气研究中心(National Centre for Atmospheric Research)存档的1951-2010年热带印度洋自愿观测船(VOS)收集的所有可获得的历史表面海洋气象数据进行了组装、质量控制、处理和分析。所有气象参数的数据分层成4°纬度和1°经度的盒子，超过5天的时间跨度，所有60年的质量控制，平均和分析，以描绘观测到的所有这些参数的时空演变为亚丁湾到马六甲海峡航道的Hovmoller图。用适当的颜色阴影强度进行二维机器轮廓，以突出分析域中的最大值和最小值。观测到的这些参数的季节内和年际变化特征沿着这条航道。这些分析的分布充分突出了1951-2010年观测到的地表气象参数在季节内和年际时间尺度上的变率。给出了强、弱ASWP、强季风年和弱季风年、El Nino (+1Y)和La Nina (+1Y)年以及正、负IOD (+1Y)年的海温和其他海洋气象参数的复合。
{"title":"Observed Intraseasonal and Interannual Variability of Arabian Sea Warm Pool along the Gulf of Aden to Strait of Malacca shipping Lane during 1951–2010","authors":"R. Rao, M. Jitendra, R. Sivakumar, S. Ramakrishna","doi":"10.1260/1759-3131.6.2.55","DOIUrl":"https://doi.org/10.1260/1759-3131.6.2.55","url":null,"abstract":"All the available historic surface marine meteorological data collected from Voluntary Observing Ships (VOS) in the tropical Indian Ocean during the period 1951–2010, archived by National Centre for Atmospheric Research, Boulder, Colorado, USA are assembled, quality controlled, processed and analyzed. Data for all the meteorological parameters stratified into 4° latitude by 1° longitude boxes, over five day durations, for all the 60 years are quality controlled, averaged and analyzed to portray the observed spatio-temporal evolution of all these parameters as Hovmoller diagrams for the Gulf of Aden to Strait of Malacca shipping lane. Two dimensional machine contouring is carried out with appropriate colour shading intensities to highlight the maxima and minima in the analyzed fields. The observed intraseasonal and interannual variability of these parameters is characterized along this shipping lane. These analyzed distributions amply highlight the observed variability of the surface meteorological parameters both on intraseasonal and interannual time scales during 1951–2010. Composites of SST and other marine meteorological parameters for strong and weak ASWP regimes, for strong and weak monsoon years, for El Nino (+1Y) and La Nina (+1Y) years and for Positive and Negative IOD (+1Y) years are presented.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114993401","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}
Pub Date : 2015-06-01DOI: 10.1260/1759-3131.6.2.87
R. Rao
A subset of the newly published salinity and temperature climatologies of the global ocean is assembled to examine the observed seasonal variability of the near-surface salinity field of the tropical Indian Ocean. The role of vertical haline stratification in the near-surface layers on the manifestation of the barrier layer thickness in the new climatology is addressed. The warm pool of the tropical Indian Ocean is characterized to identify the geographic regions where the near-surface haline stratification and the warm pool core co-exist. Among the three regions within the warm pool of the tropical Indian Ocean, viz., southeastern Arabian Sea, southwestern Bay of Bengal and eastern equatorial Indian Ocean, a strong coupling between the near-surface haline stratification and the subsequent evolution of the warm pool core is most prominently seen only in the southeastern Arabian Sea. The observed year to year co-variability of the near-surface low salinity pool and the warm pool core in the southeastern Arabian Sea is examined.
{"title":"Observed Variability of Near-Surface Salinity Field on Seasonal and Interannual Time Scales and Its Impact on the Evolution of Sea Surface Temperature of the Tropical Indian Ocean","authors":"R. Rao","doi":"10.1260/1759-3131.6.2.87","DOIUrl":"https://doi.org/10.1260/1759-3131.6.2.87","url":null,"abstract":"A subset of the newly published salinity and temperature climatologies of the global ocean is assembled to examine the observed seasonal variability of the near-surface salinity field of the tropical Indian Ocean. The role of vertical haline stratification in the near-surface layers on the manifestation of the barrier layer thickness in the new climatology is addressed. The warm pool of the tropical Indian Ocean is characterized to identify the geographic regions where the near-surface haline stratification and the warm pool core co-exist. Among the three regions within the warm pool of the tropical Indian Ocean, viz., southeastern Arabian Sea, southwestern Bay of Bengal and eastern equatorial Indian Ocean, a strong coupling between the near-surface haline stratification and the subsequent evolution of the warm pool core is most prominently seen only in the southeastern Arabian Sea. The observed year to year co-variability of the near-surface low salinity pool and the warm pool core in the southeastern Arabian Sea is examined.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130396077","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}
Pub Date : 2015-03-01DOI: 10.1260/1759-3131.6.1.35
J. Satheeshkumar, R. Balaji
The complex seabed contours and geometry of basin lead to a unique tidal pattern along India's Gulf of Khambhat (GoK). Estimation of tidal levels and associated currents in this basin is challenging due to the amplification of tides and intense current magnitudes. In this study, the finite difference based numerical model, Delft3D-FLOW has been set up. Spatially varying bottom roughness parameters have been used to estimate the tidal levels and currents for the entire basin and the results are compared with an earlier work of Sathish Kumar and Balaji (2014 and 2015) based on an alternative finite element based numerical model, Telemac2D. An inter-comparison of model results shows good agreement with each other and with the field measurements. The tidal levels are observed to vary from 2m to more than 10m in the narrowing portion of the gulf while the maximum current velocity is seen as 3m/s.
{"title":"Inter-Comparison of Hydrodynamic Models of Gulf of Khambhat","authors":"J. Satheeshkumar, R. Balaji","doi":"10.1260/1759-3131.6.1.35","DOIUrl":"https://doi.org/10.1260/1759-3131.6.1.35","url":null,"abstract":"The complex seabed contours and geometry of basin lead to a unique tidal pattern along India's Gulf of Khambhat (GoK). Estimation of tidal levels and associated currents in this basin is challenging due to the amplification of tides and intense current magnitudes. In this study, the finite difference based numerical model, Delft3D-FLOW has been set up. Spatially varying bottom roughness parameters have been used to estimate the tidal levels and currents for the entire basin and the results are compared with an earlier work of Sathish Kumar and Balaji (2014 and 2015) based on an alternative finite element based numerical model, Telemac2D. An inter-comparison of model results shows good agreement with each other and with the field measurements. The tidal levels are observed to vary from 2m to more than 10m in the narrowing portion of the gulf while the maximum current velocity is seen as 3m/s.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131759373","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}
The statistical characteristics of short-term wave records collected from a wave buoy deployed off the coast of Savannah, Georgia, USA are analyzed. The statistical distribution of observed surface elevation is derived and compared with theoretical estimations. The minimum length of time series for stationary conditions is specified using a synthetic approach. A new technique that considers the variability of different dimensionless parameters has been introduced to improve the theoretical distributions of wave crests, troughs and heights. The observed distributions of wave crests and troughs are computed and compared with the Rayleigh distribution as well as the Tayfun distribution. The characteristic wave heights of measured data are compared with those estimated from the Boccotti distribution over different time intervals. The empirical estimation of expected maximum wave heights as a function of the number of waves is examined using a statistical approach, and compared with results from both Boccotti and Tayfun models using the newly introduced technique. Conclusions concerning the efficacy and applicability of theoretical distributions to real ocean wave conditions are summarized.
{"title":"Statistical Analysis of Non-Stationary Waves off the Savannah Coast, Georgia, USA","authors":"Xiufeng Yang","doi":"10.1260/1759-3131.6.1.1","DOIUrl":"https://doi.org/10.1260/1759-3131.6.1.1","url":null,"abstract":"The statistical characteristics of short-term wave records collected from a wave buoy deployed off the coast of Savannah, Georgia, USA are analyzed. The statistical distribution of observed surface elevation is derived and compared with theoretical estimations. The minimum length of time series for stationary conditions is specified using a synthetic approach. A new technique that considers the variability of different dimensionless parameters has been introduced to improve the theoretical distributions of wave crests, troughs and heights. The observed distributions of wave crests and troughs are computed and compared with the Rayleigh distribution as well as the Tayfun distribution. The characteristic wave heights of measured data are compared with those estimated from the Boccotti distribution over different time intervals. The empirical estimation of expected maximum wave heights as a function of the number of waves is examined using a statistical approach, and compared with results from both Boccotti and Tayfun models using the newly introduced technique. Conclusions concerning the efficacy and applicability of theoretical distributions to real ocean wave conditions are summarized.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"210 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114316527","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}
Pub Date : 2015-03-01DOI: 10.1260/1759-3131.6.1.19
M. Sharada, C. Devasena, P. Swathi, M.V. SundaraDeepthi, M.K. ShelvaSrinivasan, K. Yajnik
We have investigated the climatological and interannual variability of biogeochemical cycles in the north Indian Ocean with simulations of TOPAZ (Tracers Of Phytoplankton with Allometric Zooplankton) during 1949–2009. Model simulations have been carried out with climatological and interannual fluxes forcings and the results have been evaluated by using the available data from different sources in the Arabian Sea and the Bay of Bengal. The model captures significant spatial and seasonal features in surface chlorophyll and primary productivity observed in satellite data. Seasonal and interannual variations, and profiles of a few of the state variables obtained from the coupled model simulations compare well with the cruise and satellite data at a few stations for many seasons in the Arabian Sea and the Bay of Bengal. We have also studied the spatial, seasonal and interannual variations of sea surface temperature (SST) and surface chlorophyll anomalies in the north Indian Ocean using model simulation results and satellite data. It is seen that a negative surface chlorophyll anomaly correlates well with a positive SST anomaly.
利用TOPAZ (phytotracers of plankton with alloometric Zooplankton)模拟研究了1949-2009年间北印度洋生物地球化学循环的气候和年际变化。对气候和年际通量强迫进行了模式模拟，并利用阿拉伯海和孟加拉湾不同来源的现有数据对模拟结果进行了评价。该模式捕获了卫星数据观测到的地表叶绿素和初级生产力的显著空间和季节特征。从耦合模式模拟中获得的季节和年际变化以及一些状态变量的剖面图与阿拉伯海和孟加拉湾几个站点的许多季节的巡航和卫星数据比较好。我们还利用模式模拟结果和卫星资料研究了北印度洋海温(SST)和海面叶绿素异常的空间、季节和年际变化。表层叶绿素负异常与海温正异常具有良好的相关性。
{"title":"Seasonal and Interannual Variability of Marine Ecosystem in the North Indian Ocean: A Model Evaluation Study","authors":"M. Sharada, C. Devasena, P. Swathi, M.V. SundaraDeepthi, M.K. ShelvaSrinivasan, K. Yajnik","doi":"10.1260/1759-3131.6.1.19","DOIUrl":"https://doi.org/10.1260/1759-3131.6.1.19","url":null,"abstract":"We have investigated the climatological and interannual variability of biogeochemical cycles in the north Indian Ocean with simulations of TOPAZ (Tracers Of Phytoplankton with Allometric Zooplankton) during 1949–2009. Model simulations have been carried out with climatological and interannual fluxes forcings and the results have been evaluated by using the available data from different sources in the Arabian Sea and the Bay of Bengal. The model captures significant spatial and seasonal features in surface chlorophyll and primary productivity observed in satellite data. Seasonal and interannual variations, and profiles of a few of the state variables obtained from the coupled model simulations compare well with the cruise and satellite data at a few stations for many seasons in the Arabian Sea and the Bay of Bengal. We have also studied the spatial, seasonal and interannual variations of sea surface temperature (SST) and surface chlorophyll anomalies in the north Indian Ocean using model simulation results and satellite data. It is seen that a negative surface chlorophyll anomaly correlates well with a positive SST anomaly.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115581381","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}
Pub Date : 2015-03-01DOI: 10.1260/1759-3131.6.1.47
R. Goyal, Kriti Singh, A. Hegde, G. Thakur
Quarter Circular Breakwater (QBW) is emerging as a new topic of research for port engineers worldwide, with a special emphasis on its hydrodynamic performance characteristics. QBW is a new type of breakwater based on the principles of Semicircular breakwater (SBW). The present paper discusses the development of prediction models for the coefficient of transmission of QBW using MATLAB based stepwise regression approach. Data used for the modeling was obtained from experiments conducted on scaled downed physical models of QBW in the regular wave flume available at the Marine Structures laboratory of the Department of Applied Mechanics and Hydraulics, National Institute of Technology Karnataka (NITK), Surathkal in India. Using the stepwise method to perform a multi-linear regression of the transmission coefficient (Kt), a relation was established in terms of independent parameters such as wave height (H), wave period (T) and depth of water (d).
{"title":"Prediction of Hydrodynamic Characteristics of Quarter Circular Breakwater Using Stepwise Regression","authors":"R. Goyal, Kriti Singh, A. Hegde, G. Thakur","doi":"10.1260/1759-3131.6.1.47","DOIUrl":"https://doi.org/10.1260/1759-3131.6.1.47","url":null,"abstract":"Quarter Circular Breakwater (QBW) is emerging as a new topic of research for port engineers worldwide, with a special emphasis on its hydrodynamic performance characteristics. QBW is a new type of breakwater based on the principles of Semicircular breakwater (SBW). The present paper discusses the development of prediction models for the coefficient of transmission of QBW using MATLAB based stepwise regression approach. Data used for the modeling was obtained from experiments conducted on scaled downed physical models of QBW in the regular wave flume available at the Marine Structures laboratory of the Department of Applied Mechanics and Hydraulics, National Institute of Technology Karnataka (NITK), Surathkal in India. Using the stepwise method to perform a multi-linear regression of the transmission coefficient (Kt), a relation was established in terms of independent parameters such as wave height (H), wave period (T) and depth of water (d).","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129622948","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：