Models that simulate the signature of single airguns form the basis for modelingthe signals of airgun arrays. Most of the existing models assume that the air inside theproduced bubble is ideal gas, which may lead to e...Models that simulate the signature of single airguns form the basis for modelingthe signals of airgun arrays. Most of the existing models assume that the air inside theproduced bubble is ideal gas, which may lead to errors because of the high operating pressureof the airguns. In this study, we propose a model that precisely simulates the signals of singleairguns by applying the Van der Waals equation based on the Ziolkowski algorithm. We alsoconsider a thermodynamically open quasistatic system, the heat transition between waterand gas, the throttling effect of the port and the bubble rise, and the effect of the sea surface.Modeling experiments show that （1） the energy of the source increases and the signal-to-noise ratio of the signature wavelet decreases with increasing seawater temperature, （2） thereflection coefficient of the sea surface under the actual state and depth of the source affectsthe notch caused by the surface reflection, （3） the computed signature with the proposedmodel is very close to the actual data, and （4） the proposed model accurately simulates thesignature of sinale air^uns.展开更多
为了使台风路径的数值预报更加精确,本文对人造(Bogus)涡旋构建方案进行了改进,形成了一种新的Bogus方案。该方案直接采用台风外围的风圈观测信息,并成功地植入到WRF(weather research and forecasting)模式中。本文利用该方案,选取2011...为了使台风路径的数值预报更加精确,本文对人造(Bogus)涡旋构建方案进行了改进,形成了一种新的Bogus方案。该方案直接采用台风外围的风圈观测信息,并成功地植入到WRF(weather research and forecasting)模式中。本文利用该方案,选取2011年9号台风“梅花”这一典型案例展开讨论,结果表明:1)新构造的台风切向风廓线更加真实地反映了台风风场的实际情况;2)新的Bogus方案对台风中心位置的预报,更有利于对台风路径的预报;3)台风内核风场强度,对其非对称结构起到关键的作用,直接影响对台风路径的预报。展开更多
基金This research is financially supported by the National Science Foundation Project （Grant No. 41176077, 41230318） and the National 973 Program （Grant No. 2009CB219505）.
文摘Models that simulate the signature of single airguns form the basis for modelingthe signals of airgun arrays. Most of the existing models assume that the air inside theproduced bubble is ideal gas, which may lead to errors because of the high operating pressureof the airguns. In this study, we propose a model that precisely simulates the signals of singleairguns by applying the Van der Waals equation based on the Ziolkowski algorithm. We alsoconsider a thermodynamically open quasistatic system, the heat transition between waterand gas, the throttling effect of the port and the bubble rise, and the effect of the sea surface.Modeling experiments show that （1） the energy of the source increases and the signal-to-noise ratio of the signature wavelet decreases with increasing seawater temperature, （2） thereflection coefficient of the sea surface under the actual state and depth of the source affectsthe notch caused by the surface reflection, （3） the computed signature with the proposedmodel is very close to the actual data, and （4） the proposed model accurately simulates thesignature of sinale air^uns.
文摘为了使台风路径的数值预报更加精确,本文对人造(Bogus)涡旋构建方案进行了改进,形成了一种新的Bogus方案。该方案直接采用台风外围的风圈观测信息,并成功地植入到WRF(weather research and forecasting)模式中。本文利用该方案,选取2011年9号台风“梅花”这一典型案例展开讨论,结果表明:1)新构造的台风切向风廓线更加真实地反映了台风风场的实际情况;2)新的Bogus方案对台风中心位置的预报,更有利于对台风路径的预报;3)台风内核风场强度,对其非对称结构起到关键的作用,直接影响对台风路径的预报。
