Vortexes induced by tsunamis,“tsunami vortexes”,pose a potential danger for ship evacuation,and their prediction is important to determine their role in navigation and safe vessel evacuation.This study simulated tsu...Vortexes induced by tsunamis,“tsunami vortexes”,pose a potential danger for ship evacuation,and their prediction is important to determine their role in navigation and safe vessel evacuation.This study simulated tsunami-induced vortexes in Osaka Bay and investigated their spatial and temporal scales using a port-resolved,high-resolution tsunami model based on a scenario for the largest tsunamigenic earthquake expected to occur along the Nankai Trough in the near future.Vortexes induced by tidal currents were also evaluated using a realistic tidal simulation for comparison with the magnitudes of the tsunami vortexes.The tsunami simulation identified the dominant areas of the tsunami vortexes characterized by the magnitude of the vorticity.Unified maps of tsunami speeds and vortexes showed the difficult areas for ship evacuation and indicated that these areas can persist after the approach of the leading wave around the entrances to port areas.The areas of tsunami vortex formation were largely deduced by analyzing the vorticity fields in the tidal simulations,because the magnitude of tsunami-induced vorticities was closely correlated with that of the tide-induced vorticities.The combination of tide and tsunami simulations can identify areas of tsunami vortex formation and provide valuable information to guide measures for safer vessel evacuation.展开更多
(1)This article,published on 20 June 2013,had the following title:A VASUALIZATION FOR THE DYNAMIC BEHAVIORS OF THE MIXTURE OF WATER MASS FOR NORTHWESTERN PACIFIC NEAR JAPAN Here“VASUALIZATION”should be“VISUALIZATIO...(1)This article,published on 20 June 2013,had the following title:A VASUALIZATION FOR THE DYNAMIC BEHAVIORS OF THE MIXTURE OF WATER MASS FOR NORTHWESTERN PACIFIC NEAR JAPAN Here“VASUALIZATION”should be“VISUALIZATION”.展开更多
Recent studies are focusing on the distribution of water mass because the mixture region of water mass is highly related to the rich fishing grounds[Yasuda I.,Watanabe Y.,Fish.Oceanogr.3(3):172–181,1994].Due to the l...Recent studies are focusing on the distribution of water mass because the mixture region of water mass is highly related to the rich fishing grounds[Yasuda I.,Watanabe Y.,Fish.Oceanogr.3(3):172–181,1994].Due to the large data size and time-varying property,efficient exploration and visualization of the ocean data is always extremely challenging.To extract the dynamic behaviors of the water mass and its mixture from a large-scale simulated ocean dataset,we developed an efficient visualization system by applying our volume compression method and our volume rendering method.This system allows us to investigate the time-varying distributions of ocean physical properties,additionally from the user’s perspective and requirements.In the experiments,we show the generality and expressiveness by applying our system for single-and multi-property visualizations to find some significant ocean water mass.Consequently,we could obtain a clear visualization result to show the dynamic behaviors of the mixture of water mass for simulation data regarding a location in the northwestern Pacific near Japan.展开更多
文摘Vortexes induced by tsunamis,“tsunami vortexes”,pose a potential danger for ship evacuation,and their prediction is important to determine their role in navigation and safe vessel evacuation.This study simulated tsunami-induced vortexes in Osaka Bay and investigated their spatial and temporal scales using a port-resolved,high-resolution tsunami model based on a scenario for the largest tsunamigenic earthquake expected to occur along the Nankai Trough in the near future.Vortexes induced by tidal currents were also evaluated using a realistic tidal simulation for comparison with the magnitudes of the tsunami vortexes.The tsunami simulation identified the dominant areas of the tsunami vortexes characterized by the magnitude of the vorticity.Unified maps of tsunami speeds and vortexes showed the difficult areas for ship evacuation and indicated that these areas can persist after the approach of the leading wave around the entrances to port areas.The areas of tsunami vortex formation were largely deduced by analyzing the vorticity fields in the tidal simulations,because the magnitude of tsunami-induced vorticities was closely correlated with that of the tide-induced vorticities.The combination of tide and tsunami simulations can identify areas of tsunami vortex formation and provide valuable information to guide measures for safer vessel evacuation.
文摘(1)This article,published on 20 June 2013,had the following title:A VASUALIZATION FOR THE DYNAMIC BEHAVIORS OF THE MIXTURE OF WATER MASS FOR NORTHWESTERN PACIFIC NEAR JAPAN Here“VASUALIZATION”should be“VISUALIZATION”.
基金supported by“Hakodate Marine Bio Cluster Project”in the knowledge Cluster Program from 2009a Grant-in-Aid for University and Society Collaboration from the Ministry of Education,Culture,Sports,Science and Technology(MEXT)+1 种基金a Grant-in-Aid for the Research Program on Climate Change Adaptation(RECCA)a Japan and France JST-ANR joint Grand-in-Aid for the PetaFlow project.
文摘Recent studies are focusing on the distribution of water mass because the mixture region of water mass is highly related to the rich fishing grounds[Yasuda I.,Watanabe Y.,Fish.Oceanogr.3(3):172–181,1994].Due to the large data size and time-varying property,efficient exploration and visualization of the ocean data is always extremely challenging.To extract the dynamic behaviors of the water mass and its mixture from a large-scale simulated ocean dataset,we developed an efficient visualization system by applying our volume compression method and our volume rendering method.This system allows us to investigate the time-varying distributions of ocean physical properties,additionally from the user’s perspective and requirements.In the experiments,we show the generality and expressiveness by applying our system for single-and multi-property visualizations to find some significant ocean water mass.Consequently,we could obtain a clear visualization result to show the dynamic behaviors of the mixture of water mass for simulation data regarding a location in the northwestern Pacific near Japan.
