海底地形反演方法比较  

COMPARATIVE ANALYSIS OF METHODS FOR BATHYMETRY PREDICTION

作　　者：胡敏章[1,2,3,4] 李建成[3] 邢乐林[1,2] 翟振和[5] 欧阳明达[5] 

机构地区：[1]中国地震局地震研究所(地震大地测量重点实验室),武汉430071 [2]中国地震局地壳应力研究所武汉科技创新基地,武汉430071 [3]武汉大学测绘学院,武汉430079 [4]武汉大学地球空间环境与大地测量教育部重点实验室,武汉430079 [5]西安测绘研究所,西安710054

出　　处：《大地测量与地球动力学》2014年第5期11-16,共6页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震研究所所长基金重点项目(IS201326125);国家测绘地理信息局测绘基础研究基金项目(13-01-01);国家自然科学基金项目(41204019;41304003)

摘　　要：研究比较了海底地形反演的空域法、频域法和最小二乘配置法,选择3个2°×2°实验区域进行海底地形实算。结果表明,空域法计算结果精度虽然较频域法和最小二乘配置法略高,但计算速度非常慢,不适用于大区域海底地形模型的计算;频域法由于可以采用FFT算法,计算速度很快,精度也较高;最小二乘配置法需要已知海底地形的详细统计信息,这与海底地形反演目的相矛盾。本文还采用频域法,联合垂直重力梯度异常和船测海深数据反演了实验区域海底地形,验证了垂直重力梯度异常数据用于海底地形计算的可行性。Three methods of bathymetry prediction：Space Domain Method, Frequency Domain Method and Least Square Collocation Method were compared by actual bathymetry calculating for three experimental areas. The results show that the accuracy of Space Domain Method is slightly better than the others, the calculation efficiency is much lower and not suitable for bathymetry predicting over a large area, however. Frequency Domain Method can be used to calculate bathymetry model quickly by FFT algorithm, and accuracy is acceptable. Detailed statistics information of the bathymetry is needed for bathymetry inversion with Least Square Collocation Method. This is contradicted with the purpose of bathymetry predicting. The bathymetry models for the experimental areas were calculated with Frequency Domain Method combined with the vertical gravity gradient anomaly and the data from ship sound ings. The result indicates that it is possible to predict bathymetry wiyh vertical gravity gradient anomalies.

关 键 词：海底地形 重力异常 空域法 频域法 最小二乘配置法 

分 类 号：P229.1[天文地球—大地测量学与测量工程]