神府煤田大柳塔矿区高分辨率地震勘探     

刘昌铨  刘保金  孙振国 《东北地震研究》1994,(4)

利用高分辨率地震反射法，在地表沙丘、沙垅无规则分布的神府煤田大柳塔矿区为采掘巷道作业，勘探垂直断距２ｍ以上至５ｍ的断层分布。试验观测结果取得了良好的效果。  相似文献   

Fabry-Perot spectroscopy in space science     

J. N. Desai 《Journal of Earth System Science》1984,93(3):189-200

The paper describes use of Fabry-Perot (fp) systems in spectroscopic studies of astronomy and earth’s upper atmosphere. Factors influencing the resolution, luminosity and instrumental line shape offp spectrometer are discussed and the need for their optimization is emphasised, if desired luminosity gain is to be realised in practice. Use offp as imaging spectrometer, scanning spectrometer and as a narrow band filter are illustrated. Tandemfp systems are briefly dealt with.  相似文献   

灰色系统关联度的新模型及其在预测矿体埋深中的应用   总被引：2，自引：1，他引：2       下载免费PDF全文

彭放  徐中祥 《地球科学》1995,20(1):63-67

首先提出了灰色系统关联度的一个新模型，分析了该模型的性质，其次讨论了应用该模型和关联滤波法预测矿体埋深的问题，然后进行了理论模型试算，证实了本方法的理论效果，最后，指出了新模型的主要优点。  相似文献   

瞬时地壳运动与地震短临预报   总被引：12，自引：2，他引：12  

强祖基  赁常恭 《地学前缘》1995,2(2):213-225

本文在利用卫星红外扫描仪观测资料的基础上，探讨地震前低空大气的增温是地壳瞬时运动的表现，也是地球－大气耦合现象。通过分析，给出瞬时地壳运动引起增温的三种可能机制：岩石的辐射能量增加；岩层中ＣＨ＿４、ＣＯ＿２等气体溢出和太阳辐射导致增温；ＣＨ＿４、ＣＯ＿２含量增高和低空电场异常激发。并通过某些震例的增温展布形态及规律，恢复震前应力场和热增温演化特征：我国大陆东部ＮＮＥ方向为主压应力方向，大陆东南沿海主压应力方向ＳＮ向，而我国大陆西部地区主压应力方向为ＳＮ向，在青藏高原的东北部派生主压应力为ＮＥ向。最后，介绍了这几年试验性预报效果检验：４年多总共预报３２次，其中虚报２次，７次较准，１７次较好，６次较差，漏报强震８次。最后涉及到地震孕育、发生过程中的机理的初步研究结果。  相似文献   

再论水平和垂直分辨率之间的协调   总被引：5，自引：1，他引：5  

廖洞贤  朱艳秋 《气象学报》1995,53(2):129-137

在计算域面积为常数的约束下，给出了几种不同精度的平流方程和ω方程的“最优垂直网格距”，以及在极限情况下的“协调垂直网格距”的表达式。还讨论了在水平和垂直分辨率不协调时数值解对能量传播和计算稳定性的影响。  相似文献   

A second derivative method of resistivity sounding     

Murali Sabnavis  K. K. Sharma 《Journal of Earth System Science》1982,91(3):253-262

The second vertical derivatives of gravity and magnetic potential are widely used in geophysical prospecting because of their better resolution. On the same basis an attempt has been made to obtain the expressions for the second vertical derivative of the electrical potential and to compute its nature for comparison. Derivative responses over a two-layered earth and also over an anticlinal structure have been computed and it is shown that the second vertical derivative sounding could be employed for greater accuracy in finding out the thickness of such beds or the inclination of the sides of the anticline and its depth when compared with normal resistivity sounding  相似文献   

Reduced complexity strategies for modelling urban floodplain inundation   总被引：2，自引：1，他引：2  

Hilary K. McMillan  James Brasington   《Geomorphology》2007,90(3-4):226

Significant advances in flood inundation modelling have been made in the last decade through the use of a new generation of 2D hydraulic numerical models. These offer the potential to predict the local pattern and timing of flood depth and velocity, enabling informed flood risk zoning and improved emergency planning. With the availability of high resolution DEMs derived from airborne lidar, these models can theoretically now be routinely parameterized to represent considerable topographic complexity, even in urban areas where the potential exists to represent flows at the scale of individual buildings. Currently, however, computational constraints on conventional finite element and volume codes typically require model discretization at scales well below those achievable with lidar and are thus unable to make optimal use of this emerging data stream.In this paper we review two strategies that attempt to address this mismatch between model and data resolution in an effort to improve urban flood forecasts. The first of these strives for a solution by simplifying the mathematical formulation of the numerical model by using a computationally efficient 2D raster storage cell approach coupled to a 1D channel model. This parsimonious model structure enables simulations over large model domains offering the opportunity to employ a topographic discretization strategy which explicitly represents the built environment. The second approach seeks to further reduce the computational overhead of this raster method by employing a subgrid parameterization to represent the effect of buildings and micro-relief on flow pathways and floodplain storage. This multi-scale methodology enables highly efficient model applications at coarse spatial resolutions while retaining information about the complex geometry of the built environment.These two strategies are evaluated through numerical experiments designed to reconstruct a flood in the small town of Linton in southern England, which occurred in response to a 1 in 250 year rainfall event in October 2001. Results from both approaches are encouraging, with the spatial pattern of inundation and flood wave propagation matching observations well. Both show significant advantages over a coarse resolution model without subgrid parameterisation, particularly in terms of their ability to reproduce both hydrograph and inundation depth measurements simultaneously, without need for recalibration. The subgrid parameterization is shown to achieve this without contributing significant computational complexity and reduces model run-times by an order of magnitude.  相似文献   

川西白马庙气田上侏罗统蓬莱镇组高分辨率层序地层对比   总被引：5，自引：1，他引：5  

淡卫东  张昌民  尹太举  程绪彬  李连民 《沉积学报》2007,25(5):708-715

井震结合对川西白马庙气田蓬莱镇组进行了多级次高分辨率层序地层对比。首先对不同级次层序界面进行识别，然后依据相序、岩石的物理性质、地层的接触关系等特征并结合地震层序界面追踪，进行单井不同级次基准面旋回层序识别划分，划分出短期、中期和长期三个级次的基准面旋回。选取密集井网的联井剖面，依据等时地层对比法则并利用地震资料约束进行不同级次基准面旋回层序的联井对比，建立高精度的等时地层对比格架，在等时地层格架内进行了单砂体的对比。最后在等时地层格架内分析了储层的时空展布。  相似文献   

准格尔丘陵沟壑区五分地沟流域土地覆盖分析(英文)     

仝川  龚建周  贾钧  李慧 《福建地理》2007,(1)

以准格尔丘陵沟壑区五分地沟流域为研究区,应用彩红外航片和IKONOS卫星影像,绘制了1987、2002年土地覆盖/植被类型图,并数字化基于地面土地利用调查绘制的1979年土地利用图.利用景观格局指数,评价了研究区土地覆盖/植被空间格局现状及土地覆盖类型动态变化;并以ETM 数据为信息源,绘制了2002年土地覆盖/植被类型图.研究表明:2002年研究区土地覆盖/植被呈现出一个耕地、草地、人工乔木林和人工灌木林以及种植稀疏灌木的草地高度镶嵌的景观格局特征;20年内土地覆盖类型发生了显著的变化,景观异质性增强.基于研究区景观的高度破碎化,绘制小流域精细尺度土地覆盖图,高空间分辨率遥感数据十分必要.  相似文献   

准格尔丘陵沟壑区五分地沟流域土地覆盖分析   总被引：1，自引：0，他引：1  

仝川  龚建周  贾钧  李慧 《亚热带资源与环境学报》2007,2(1):6-20

以准格尔丘陵沟壑区五分地沟流域为研究区,应用彩红外航片和IKONOS卫星影像,绘制了1987、2002年土地覆盖/植被类型图,并数字化基于地面土地利用调查绘制的1979年土地利用图.利用景观格局指数,评价了研究区土地覆盖/植被空间格局现状及土地覆盖类型动态变化;并以ETM 数据为信息源,绘制了2002年土地覆盖/植被类型图.研究表明:2002年研究区土地覆盖/植被呈现出一个耕地、草地、人工乔木林和人工灌木林以及种植稀疏灌木的草地高度镶嵌的景观格局特征;20年内土地覆盖类型发生了显著的变化,景观异质性增强.基于研究区景观的高度破碎化,绘制小流域精细尺度土地覆盖图,高空间分辨率遥感数据十分必要.  相似文献