This thesis mainly studies the method of how to realize the scientific information visualization in the field of geophysics and its application , and develops a software system which displays related data information by 3 _ d pictures , combining the research project on 3 _ d surface velocity model tomography inversion 本论文针对物探应用的实际需要,结合三维表层速度模型层析反演的研究课题,对地震数据可视化显示方法进行研究,开发了三维表层速度模型可视化显示软件,对三维反演的有关数据进行可视化显示。
The authors established an initial velocity model based on the first break time of the actual data , then realized the forward calculation with the improved shortest path ray tracing algorithm , and applied the improved constrained damped simultaneous iterative reconstruction technique ( cdsirt ) to solve large - scale and sparse equations for inversing the near - surface velocity field 根据实际地震数据的初至波时间建立初始速度模型;采用改进的最短路径射线追踪算法进行正演;利用改进的约束带阻尼联合迭代重建技术( cdsirt )求解大型、稀疏的方程组来反演近地表的速度场。
We can analyze and observe directly the reasonability of processed data , that is helpful to improve the quality of tomography inversion and the reliability of velocity model tomography inversion , then provide reasonable surface velocity model for tomography static correction by some means , such as rotating , scale graphics , meanwhile combining with relating sectional drawing and clipping drawing 通过对三维立体进行全方位旋转、缩放显示,并结合与三维体一致的剖面和平截面的综合考察,便于直观地分析、监控地震数据处理结果的合理性,有助于提高模型层析反演的质量和表层速度模型层析反演的可靠性,并可为层析静校正提供合理的表层速度模型。
On the other hand , it is indicated that the velocity field consists of a depth - independent inertial oscillation and a time - mean shear flow , which can be obtained by subtracting the inertial oscillations time mean in one inertial period . the hodograph of the velocity vector of time - mean flow at the different depths consists of a ekman spiral , and the surface velocity is 30 . 3 ? to the right of the wind 一维模式的流场结果表明,混合层中的流场是由惯性波动与时间平均流两部分叠加而成,且通过时间平均消去惯性波动后得到平均流,其不同深度的流速矢量构成一ekman螺旋,表层流速矢量相对风向右偏了30 . 3 ’ 。