lateral adj. 1.横的,侧面的,旁边的;横向的。 2.【语音】边音的,旁流的,(舌)边的。 lateral buds 生在侧面的蓓蕾,旁蕾。 a lateral branch (of a family) 旁系(亲属)。 lateral pressure 【物理学】旁压力。 a lateral root 侧根。 a lateral view 侧面图。 n. 1.侧部的东西,侧向生长的东西。 2.【电学】支线。 3.横材。 4.【矿物】走向平巷;【建筑】横向排水沟。 5.【语音】边音,旁流音。 adv. -ly
velocity n. 1.迅速;快速。 2.速度,速率。 3.周转率。 at a velocity of 100 miles per hour 用每小时一百英里的速度。 dart off with the velocity of a bird 像鸟一样迅速飞跑过去。 drag-free velocity无阻力飞速,真空飞速。 escape velocity(克服地球引力的)第二宇宙速度,逃逸速度。 final velocity (发射物的)终速。 initial [muzzle] velocity(发射物的)初速[腔口速度]。 uniform [variable] velocity匀[变]速。
The mean lateral velocity v needs much longer streamwise journey to reach its self - similar state 平均速度v发展到自相似状态的过程要缓慢得多。
The high order generalized screen propagator not only improves the calculation precision of conventional generalized screen propagator , and facilitates the suitability of generalized screen propagator to the media with strong lateral velocity variation 高阶广义屏传播算子不仅可提高常规广义屏传播算子的计算精度,而且还能改善广义屏传播算子对速度强横向变化介质的适应性。
The frontal structure of longmenshan in the west of sichuan is very complex , showing intense structure deformation in overthrust belt , high structure amplitude , steep stratigraphic dip , developed fault blocks , complex seismic wave field , frequent change of lateral velocity , and poor image of post - stack time migration processing 摘要川西龙门山前缘构造非常复杂,逆掩推覆构造带构造形变强烈,构造幅度大,地层倾角陡,断块发育,地震波场复杂,速度横向变化大,常规叠后时间偏移处理成像效果较差。
The differences between this method and other similar methods are : ( 1 ) the fast synthetic source record algorithm based on the wave theory is adopted in prestack depth migration . ( 2 ) the plane wave source is used in migration that is consistent with the velocity analysis method . ( 3 ) by using the controlled illumination , the distortion of the plane wave source wavefield due to the lateral velocity variation is avoided therefore the error of velocity analysis is reduced and ( 4 ) the practical velocity spectrum makes the interactive migration velocity analysis feasible and convenient 与其他类似偏移速度分析方法的不同点在于: ( 1 )叠前深度偏移采用基于波动理论的快速合成震源记录算法; ( 2 )偏移方法采用平面波震源,与速度分析方法一致; ( 3 )应用控制照明技术,避免了因横向变速而导致的平面波震源波场在传播过程中的畸变,从而减小了速度分析的误差; ( 4 )实用的速度谱设计,使交互偏移速度分析可行且易于操作。
Author , starts from the one - way wave equation of wavefield extrapolation , research the relationship and transform condition of wavefield extrapolation operators , and propose the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) which can adapt severe lateral velocity variations , in frequency - wavenumber domain , and the improved wavefield extrapolation scheme , also give the method to improve the computation efficiency . the achievement establishes the theoretic basis of the whole research 首先,从波场延拓的单程波方程出发,系统地研究了频率波数域的波场延拓算子之间的相互关系和转换条件并在此基础上提出了能适应剧烈横向变速的频率波数域稳定的变参考慢度rytov近似广义屏波场延拓算子( vrselrf )和部分波场延拓改进方案及提高运算效率的措施,为整个研究打下理论基础。
Owing to complicated earth ' s surface condition such as the steep stratum outcropping of front - zone of mountain or the huge thick gravel stratum ' s overlay and earth ' s surface large undulation , complicated underground geology structure developed extremely such as thrust and overthrust nappe , and violent change of the lateral velocity , etc . in front - zone of mountain there are a series of problems such as serious secondary disturbance and low signal - to - noise ratio in seismic exploration gathering 由于山前带高陡岩层出露或巨厚砾石层的覆盖、地表起伏大等复杂的地表条件、逆冲和逆掩推覆等复杂地下地质构造发育、速度横向变化剧烈等原因,造成了山前带地震勘探资料采集存在次生干扰严重和信噪比低等一系列问题。
Author , secondly , starts from the approximate expandness of square root operator , perform mathematical calculations for finite difference operator in frequency - space domain , fourier finite difference operator in mixing domain ( frequency - space and frequency - wavenumber domain ) and general screen operator in mixing domain , compare and discuss their precision of their wavefield , adaptability for lateral velocity variations , computation efficiency and stability . thirdly , author , applies the steady variational reference slowness rytov approximation general screen wavefield extrapolation operator ( vrselrf ) in frequency - wavenumber domain , to the prestack and poststack forward modeling and depth migration 第二,从平方根算子的近似展开出发对频率?空间域的有限差分算子、混合域(频率?空间域;频率?波数域)的fourier有限差分算子、混合域的广义屏算子进行了推导并对其波场描述精度、对横向变速的适应性、计算效率和稳定性进行了比较与评述。