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1. A fast automatic interpretation of 3D potential-field data | |||
ZhangXu,YuPeng,ChenXiao,Tang Rui,XiangYang | |||
Earth Science 07 November 2013 | |||
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Abstract:Gravity and magnetic data have been extensively used in the interpretation of geologic features, such as location, depth and geological structures. We have presented two improved technique for inversing the source parameters. First we introduce a new filter called sine angle, which is useful to improve the resolution of the weak response of deep-source. We also develop a simple approach to determine both the depth and source geometry. We have generalized the approach for gravity field, especially for contact of the gravity and multiple sources with different geometries. The feasibility and stability of our method are demonstrated on synthetic data. | |||
TO cite this article:ZhangXu,YuPeng,ChenXiao, et al. A fast automatic interpretation of 3D potential-field data[OL].[ 7 November 2013] http://en.paper.edu.cn/en_releasepaper/content/4568602 |
2. Numericle simulation of the formation of linear dunes | |||
Zhang Ruyan,Luo Chunmei | |||
Earth Science 17 October 2010 | |||
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Abstract:Three-dimensional flow above the sand dunes have been studied numerically by using Large-Eddy Simulation (LES) method. In the flow direction and span direction cyclic boundary conditions are imposed for velocity and pressure. The movement of the sand which is known as the elemental types of desert have been investigated. The numerical method employed in this study can be divided into three parts: (i) calculation of the air flow above the sand dunes using standard MAC method with a generalized coordinate system; (ii) estimation of the sand transfer caused by the flow through the friction; (iii) determination of the shape of the ground. Since the computational area has been changed due to step (iii), steps (i)-(iii) are repeated until prescribed times. The simulated dunes, which is formed by two directional winds, extends at the converging direction which is known as linear dunes. | |||
TO cite this article:Zhang Ruyan,Luo Chunmei. Numericle simulation of the formation of linear dunes[OL].[17 October 2010] http://en.paper.edu.cn/en_releasepaper/content/4387969 |
3. A fully polarimetric borehole radar based numerical modelling: fully polarimetric radar responses to synthesized fractures | |||
Zhao Jianguo | |||
Earth Science 09 July 2010 | |||
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Abstract:A fully polarimetric borehole radar system with four combinations of dipole and cylindrical slot antennas was developed to acquire fully polarimetric data sets in drilled boreholes. To better under the fully polarimetric response to subsurface fractures with different roughness, in this study, synthetic fractures with different roughness are generated on a computer via fractal theory based simulation techniques. Quantitative assessment for the roughness of synthetic fractures is possible by use of three main parameters: the fractal dimension, the rms roughness at a reference length, and a length scale describing the degree of mismatch between the two fracture surfaces, allowing future detailed study of mechanical and transport properties of fractures and fully polarimetric radar response on them. Next, a 3D sub-grid FDTD numerical simulation is used to synthesize fully polarimetric data sets with synthetic fractures as primary reflectors. Based on the synthetic data sets, it is possible to evaluate the applicability of different radar polarimetry analysis approaches to physical characterization of subsurface fractures in future. | |||
TO cite this article:Zhao Jianguo. A fully polarimetric borehole radar based numerical modelling: fully polarimetric radar responses to synthesized fractures[OL].[ 9 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4378517 |
4. polarimetric calibration approaches of fully polarimetric borehole radar | |||
Zhao Jianguo | |||
Earth Science 29 January 2008 | |||
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Abstract:A fully polarimetric borehole radar system with four combinations of dipole and cylindrical slot antennas was developed to acquire fully polarimetric data sets in drilled boreholes. This system in conjunction with several radar polarimetry techniques has proved to be a good alternative to physical subsurface fracture characterization. Furthermore, we presented that such polarimetry techniques, namely Pauli decomposition, eigenvector-based decomposition, Durden-Freeman decomposition and polarimetric anisotropy parameter methods, could provide comparable performances in terms of fracture characterization and classification. Polarimetric calibration to determine a scattering matrix (Sinclare matrix) is the foremost procedure in the radar polarimetry processing chain. In this paper, we experimentally implement and evaluate two polarimetric calibration approaches, namely 1) cross-hole polarimetric calibration and 2) single-hole polarimetric calibration, utilizing a fully polarimetric data sets acquired at a specific borehole test site. Both polarimetric calibration approaches can guarantee the further implementation of radar polarimetry techniques, and especially, the single-hole polarimetric calibration will be very meaningful to practical applications | |||
TO cite this article:Zhao Jianguo. polarimetric calibration approaches of fully polarimetric borehole radar[OL].[29 January 2008] http://en.paper.edu.cn/en_releasepaper/content/18471 |
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