排序方式: 共有18条查询结果,搜索用时 15 毫秒
1.
时间谱电阻率法中的剩余电磁效应研究 总被引:2,自引:0,他引:2
根据频谱激电(SIP)法或复电阻率(CR)法中研究剩余电磁(REM)效应的思想,通过分析时间谱电阻率(TSR)法中场的基本特征,在TSR法中建立了与SIP(或CR)法中参数Φmax/Φ0max相类似的参数-Emax/E0,用来描述了TSR法中的REM效应。通过对一维可极化大地模型的REM效应的理论计算,验证了用Emax/E0表示的REM异常可用来形象地反映地电断面电阻率的高低。 相似文献
2.
The Regional Eta-coordinate Model(REM) has performed well in forecasting heavy rainfalls in China in recent years.A four-dimensional variational assimilation system(4DVar) is developed to improve the forecast skill of the REM.The tangent linear model and adjoint model codes are written according to thecode to coderule,and the establishment of the REM adjoint modeling system is introduced in detail in this paper.The tangent linear and adjoint models of the REM are validated against the observational data,... 相似文献
3.
激电法直接探测油气藏的有效性及提高其应用效果的途径 总被引:4,自引:0,他引:4
本文介绍了激电法直接探测油气藏的基本原理,对激电法直接探测油气藏的有效性进行了分析和评价,探讨和提出了提高其应用效果的途径。激电法直接探测油气藏是有效的,但也存在着某些局限性。为了提高其应用效果,笔者提出了如下建议:(1)要重视剩余电磁效应的测量;(2)要采用较大的装置;(3)应紧密结合地质资料对激电异常进行解释;(4)激电测量和资料解释应与找构造的物探方法和其它直接找油气的物化探方法相结合来进行。 相似文献
4.
5.
6.
2003年汛期3种中尺度数值预报模式降水预报检验 总被引:7,自引:0,他引:7
利用2003年汛期降水实况及河南省气象台引进的3种中尺度数值预报模式(REM、MM5、MAPS)的降水预报资料,对模式预报性能作了检验对比分析。结果发现:REM模式对于大雨以上降水的预报效果较好;MAPS模式的12h预报有明显优势;MM5模式对小雨和中雨的预报效果较好,并且预报结果具有稳定性。 相似文献
7.
We derive a governing second-order acoustic wave equation in the time domain with a perfectly matched layer absorbing boundary condition for general inhomogeneous media. Besides, a new scheme to solve the perfectly matched layer equation for absorbing reflections from the model boundaries based on the rapid expansion method is proposed. The suggested scheme can be easily applied to a wide class of wave equations and numerical methods for seismic modelling. The absorbing boundary condition method is formulated based on the split perfectly matched layer method and we employ the rapid expansion method to solve the derived new perfectly matched layer equation. The use of the rapid expansion method allows us to extrapolate wavefields with a time step larger than the ones commonly used by traditional finite-difference schemes in a stable way and free of dispersion noise. Furthermore, in order to demonstrate the efficiency and applicability of the proposed perfectly matched layer scheme, numerical modelling examples are also presented. The numerical results obtained with the put forward perfectly matched layer scheme are compared with results from traditional attenuation absorbing boundary conditions and enlarged models as well. The analysis of the numerical results indicates that the proposed perfectly matched layer scheme is significantly effective and more efficient in absorbing spurious reflections from the model boundaries. 相似文献
8.
9.
卫星导风资料对REM中尺度数值模拟的改进研究 总被引:4,自引:5,他引:4
应用GMS-5静止气象卫星云图导出的风场产品-云迹风资料对REM中尺度η坐标有限区域数值模式的初始风场进行改进处理.模拟了2001年7月27~28日及8月16、18~19日共5天的降水过程,通过初始场的改进进行控制试验(CTE)和敏感性试验(STF)。研究结果表明,利用卫星云图导出的云迹风场资料,对中尺度数值模式的初始风场进行改进可以提高模拟精度.从而改善因测站稀疏造成的中小尺度系统漏报的不足,提高降水的预报精度。 相似文献
10.
介绍了讨论了复电阻率法探测油气藏的基本原理,提出了用复电阻率法探测油气藏时,尤其是在良导电覆盖层地区,分离激电和电磁响应,获取剩余电磁资料的一种有效技术。指出复电阻率测量剖面附近的套管会引起明显的视电阻率,激电和剩余电磁资料异常。为了去除或减弱这种干扰异常,提出了一种校正方案,最后,对复电阻率法在研究地区的应用进行了介绍和讨论。 相似文献