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21.
Determination of the degree 120 time-variable gravity field in the Sichuan-Yunnan region using Slepian functions and terrestrial measurements
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The terrestrial time-variable gravity measurements are characterized by a high signal-to-noise ratio and sensitivity to the sources of mass change in the Earth's crust. These gravity data have many applications, such as surface deformation, groundwater storage changes, and mass migration before and after earthquakes. Based on repeated terrestrial gravity measurements at 198 gravity stations in the Sichuan-Yunnan region (SYR) from 2015 to 2017, we determine a time series of degree 120 gravity fields using the localized spherical harmonic (Slepian) basis functions. Our results show that adopting the first 6 Slepian basis functions is sufficient for effective localized Slepian modeling in the SYR. The differences between two gravity campaigns at the same time of year show an obvious correlation with tectonic features. The degree 120 timevariable gravity models presented in this paper will benefit the study of the regional mass migration inside the crust of the SYR and supplement the existing geophysical models for the China Seismic Experimental Site. 相似文献
22.
张武梅 《成都信息工程学院学报》2009,24(3)
在拓扑线性空间中存在非连续线性泛函的基础上,给出了拓扑线性空间中存在非连续线性算子的充要条件,即拓扑线性空间中存在不闭的线性真子空间. 相似文献
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海洋区域地质调查中,单道地震勘探以其高分辨率、方便快捷等优点成为揭示浅地层地质构造的重要手段之一.结合前人研究成果并出于保护信号的完整性,对低频部分的噪声采用带通滤波进行滤除,而对高频信号中的随机噪声采用小波阈值去噪方法进行压制处理.在小波阈值去噪过程中,通过比较选用最佳小波基函数sym5对地震剖面进行三层小波分解.结果表明:两种阈值去噪方法在带通滤波的基础上进一步提升了剖面的质量,使得反射层面变得连续可追踪.软阈值去噪滤掉了剖面上的较多信息,去噪效果较为彻底,硬阈值去噪则保留了较多的细节信息. 相似文献
25.
Wave–current laboratory experiments have shown that the logarithmic current profile observed in pure current flows is modified due to the presence of waves. When waves propagate opposite the current, an increase in the current intensity is achieved near the mean water level, while a reduction is obtained for following waves and currents. With the aim of analyzing these nonlinear effects along the whole water column, an Eulerian wave–current model is presented. In contrast to previously presented wave–current models, the present is able to include the variation of the free surface elevation due to the wave motion and the effect of a non hydrostatic pressure field. Therefore it does not restrict its application to waves in shallow waters. Moreover, the model is able to simulate all the possible angles between waves and currents. 相似文献
26.
Abstract The vertical profiles of streamwise velocities are computed on flood plains vegetated with trees. The calculations were made based on a newly developed one-dimensional model, taking into account the relevant forces acting on the volumetric element surrounding the considered vegetation elements. A modified mixing length concept was used in the model. An important by-product of the model is the method for evaluating the friction velocities, and consequently bed shear stresses, in a vegetated channel. The model results were compared with the relevant experimental results obtained in a laboratory flume in which flood plains were covered by simulated vegetation. 相似文献
27.
Closed form analytic expressions for displacement and stresses at any point of either of the two homogeneous, isotropic, perfectly
elastic half-spaces in welded contact due to very long strike-slip dislocations are obtained. Both cases of vertical and horizontal
strike-slip dislocations are discussed in detail. Variation of the displacement with horizontal distance from the fault and
with vertical distance from the interface for a vertical strike-slip fault is studied numerically. 相似文献
28.
油藏地球化学的基础与展望 总被引:6,自引:0,他引:6
在系统综述国内外油藏地球化学研究现状和研究方法的基础上,着重介绍了其4个研究领域及地质意义,即:油藏地球化学描述、油藏原油混合作用原理、油藏中的有机隔层-沥青垫、油藏内有机-无机相互作用及储层润湿的改变。 相似文献
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美国长期天气预报业务的新发展──发布气候展望 总被引:1,自引:0,他引:1
从1995年元月份起,美国天气局正式发布预见期为一年的业务性气候展望,该文简要地介绍了美国天气局作出这些重大变更的科学依据、预报方法、预报制作与预报准确等方面的情况。 相似文献