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测绘学报  2015 

采用重力异常的导纳理论推估海底地形

DOI: 10.11947/j.AGCS.2015.20140427, PP. 1092-1099

Keywords: 重力地形导纳,海底地形,重力异常,均衡理论

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Abstract:

系统探讨了采用重力异常的导纳理论推估海底地形的方法.在频率域内对海底地形和重力异常的相关性进行了分析,确定在20~300km波段内两者相关系数最高,适合通过重力异常反演.以皇帝海山链为例,分别采用未补偿导纳模型和顾及挠曲补偿的导纳模型开展研究,其中涉及的地壳厚度和有效弹性厚度等参数通过均衡响应函数法得到.引入余弦低通滤波器,有效地解决了向下延拓过程中产生的高频震荡问题.算例结果表明,采用重力异常的导纳理论能够有效地反演海底地形,结果真实可靠,反演模型的相对精度在6%左右,与ETOPO1模型相当,且能够刻画出ETOPO1模型中未显现的地形细节.由于地形变化剧烈,反演模型在海山链沿线附近精度不甚理想.

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