基于sar的高程重力数据的海岸测深反演:以南桑威奇岛为例

IF 2.8 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Yihao Wu , Junjie Wang , Xiufeng He , Yunlong Wu , Dongzhen Jia , Yueqian Shen
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引用次数: 2

摘要

由于极地地区恶劣的气候环境和复杂的地形,全球测深模式在极地地区的海岸线上精度较低。卫星测高重力数据可以作为补充,并在这些地区的水深模拟中发挥关键作用。在CryoSat-2和Sentinel-3A/3B等任务中使用的合成孔径雷达(SAR)高度计可以消除传统高度计存在的波形污染,并提供更高精度和空间分辨率的数据。在本研究中,我们探讨了SAR高度重力数据在增强海岸测深方面的潜在应用,并对SAR高度数据引入的局部测深模型的影响进行了量化和评估。此外,我们还研究了使用不同的比例因子计算方法对水深建模的影响,其中实现了分区方案。在南极洲附近的南桑威奇群岛上进行的数值试验表明,与没有SAR高度数据计算的模式相比,使用基于SAR的高度重力数据在近海10公里范围内提高了3.55 m的震级。此外,采用分块方案进行尺度因子计算,得到的海岸测深模型质量比传统方法提高了7.34 m。这些结果表明了利用SAR测高数据进行海岸测深反演的优越性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coastal bathymetry inversion using SAR-based altimetric gravity data: A case study over the South Sandwich Island

The global bathymetry models are usually of low accuracy over the coastline of polar areas due to the harsh climatic environment and the complex topography. Satellite altimetric gravity data can be a supplement and plays a key role in bathymetry modeling over these regions. The Synthetic Aperture Radar (SAR) altimeters in the missions like CryoSat-2 and Sentinel-3A/3B can relieve waveform contamination that existed in conventional altimeters and provide data with improved accuracy and spatial resolution. In this study, we investigate the potential application of SAR altimetric gravity data in enhancing coastal bathymetry, where the effects on local bathymetry modeling introduced from SAR altimetry data are quantified and evaluated. Furthermore, we study the effects on bathymetry modeling by using different scale factor calculation approaches, where a partition-wise scheme is implemented. The numerical experiment over the South Sandwich Islands near Antarctica suggests that using SAR-based altimetric gravity data improves local coastal bathymetry modeling, compared with the model calculated without SAR altimetry data by a magnitude of 3.55 m within 10 km of offshore areas. Moreover, by using the partition-wise scheme for scale factor calculation, the quality of the coastal bathymetry model is improved by 7.34 m compared with the result derived from the traditional method. These results indicate the superiority of using SAR altimetry data in coastal bathymetry inversion.

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来源期刊
Geodesy and Geodynamics
Geodesy and Geodynamics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
4.40
自引率
4.20%
发文量
566
审稿时长
69 days
期刊介绍: Geodesy and Geodynamics launched in October, 2010, and is a bimonthly publication. It is sponsored jointly by Institute of Seismology, China Earthquake Administration, Science Press, and another six agencies. It is an international journal with a Chinese heart. Geodesy and Geodynamics is committed to the publication of quality scientific papers in English in the fields of geodesy and geodynamics from authors around the world. Its aim is to promote a combination between Geodesy and Geodynamics, deepen the application of Geodesy in the field of Geoscience and quicken worldwide fellows'' understanding on scientific research activity in China. It mainly publishes newest research achievements in the field of Geodesy, Geodynamics, Science of Disaster and so on. Aims and Scope: new theories and methods of geodesy; new results of monitoring and studying crustal movement and deformation by using geodetic theories and methods; new ways and achievements in earthquake-prediction investigation by using geodetic theories and methods; new results of crustal movement and deformation studies by using other geologic, hydrological, and geophysical theories and methods; new results of satellite gravity measurements; new development and results of space-to-ground observation technology.
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