三层残差点质量模型的边界效应分析及有效性准则构建

Analysis for boundary effect of three-tier mass point model and construction of validity criterion

为了满足点质量法应用需求,研究了三层残差点质量模型恢复效果,定量给出了边界效应发生范围和大小,同时构建了残差点质量法的适用性准则.利用Sandwell教授团队提供的全球重力异常数据,对重力异常变化程度不同的三个地区进行仿真实验,在满足恢复精度的条件下,确定了点质量模型在不同区间里的有效性准则.数值实验表明,点质量分辨率越高,区域重力异常变化越剧烈,其产生的边界效应越强.边界效应大致出现在距离边界时,且在距离边界时变得显著剧烈.

To meet the requirement of the use of mass point model,Analysis and calculation of recovery effect of the three-tier mass point model. The range and magnitude of the boundary effect are given,and the applicability of mass point model is constructed. The global gravity anomaly data of which is provided by Professor Sandwell team is used to do simulation experiment in three places where the degree of change of gravity anomaly is different. Making a validity criterion of three-tier mass point model in different places in ensuring the of recovery precision. As a result,when the resolution of mass point model is higher and the change of gravity anomaly is more acute,the boundary effect produced by it is much stronger. By the experiment,we found that the boundary effect occurred mostly in the distance from the boundary line of. At the same time,the boundary effect is more acute when the recovery area is in the distance from the boundary line. However,at the same experimental zone,the accuracy does not necessarily decrease with the expanding central area range.