江苏浅层低温位地热资源开发利用前景     

赵剑畏  庄颖 《江苏地质》2005,29(3):190-192

江苏能源供应的严峻形势促使了地热资源的勘查和开发力度的加大；地热工作的实践和科学技术的进步，逐步扩大了其工作领域；浅层地温作为江苏地热资源开发利用的新领域被提上日程，依据现有资料，认为其前景广阔。  相似文献   

油水层快速识别改进的CP网络方法初探   总被引：1，自引：0，他引：1  

陆万雨  管志宁  宋子齐 《物探与化探》2002,26(1):53-56

CP网络具有分类快速、准确等优点。文中详细介绍了CP网络的算法,并对其进行了部分改进,增加了误差检验和网络测试功能;使用VisualBasic6.0开发了相应仿真软件,并将其用于某油田的油、水层快速识别。实际应用表明:改进的CP网络训练周期短、识别准确率高,完全可以用于油、水层等的快速识别,具有广阔的应用前景。  相似文献   

The “peeling” method to process apparent resistivity data for earthquake precursory monitoring     

Mao Xian-jin  Qian Jia-dong 《地震学报(英文版)》2001,14(6):685-691

Considering the fact that there is only one pair of fixed potential poles in one direction used to monitor the resistivity changes under the observatory station which may indicate process of earthquake preparation, based on the precondition that the resistivity structure is 1-dimensional under the observatory station, and by way of equivalent model put forward by the authors, this paper suggests a kind of method trying to separate the resistivity changes in deep layers from that of the shallow layer. Analysis shows that, to obtain the same measured data with the same array, any a multi-layered geo-electrical structure can be equivalently taken as a two-layered one, we call it equivalent model. In this paper, the resistivity and thickness of the upper layer of the equivalent model are equal to that of the first layer of the original one, the resistivity of the lower layer of the equivalent model is obtained with calculation according to the requirement of equivalence, its value is relevant with the resistivities and thicknesses of all layer of the original model except for the first one, so the resistivity change of the equivalent layer can indicate the synthetic effect of variation of all layers of the original model except for the first one. The primary research results show that this method can work well. Foundation item: Chinese Joint Seismological Science Foundation (100146).  相似文献   

Seismic Risk Maps of Taiwan Areasin the Period from 2001 to 2010     

Cheng Kuei-Hsiang 《中国地震研究》2001,15(3):311-320

INTRODUCTIONSeveMmethdsdPOtential analyslsfor medium－and short－termpredlctlon dl’l;lln shocks weredevelopedbaseduponthe pnnclpledInaccufatemeasurementoffOCfOCustheoryaMthepattemdmainshocks．These analytic methods can be used to predict strong earthop拙es In shallow layers on thesubducting plate boundeq In squeezed zones．More than a half of strong earthquakes In the world。located inthe shallow depth tthe suMuctingplate boundw In s仰eezed zones．This paPerfirst Statesthe philoso…  相似文献   

湖南洞庭坳陷大地电磁测深研究   总被引：1，自引：0，他引：1  

魏文博  张先觉 《现代地质》1996,10(4):532-542

介绍了大地电磁测深在湖南洞庭坳陷的主要研究成果。详细分析、推断了洞庭地区的区域构造格局，深部电性结构及壳、幔高导层的分布特点  相似文献   

非线性土层地震反应分析的一种方法   总被引：12，自引：0，他引：12  

李小军 《华南地震》1992,12(4):1-8

本文利用作者给出的土的剪切动力本构关系的动态骨架曲线模型,结合显式差分数值逐步积分方法,给出了一种分析非线性土层地震反应的方法。反应计算中,地震效应视为基底剪切波垂直入射,且考虑了上部土层中能量向弹性基底辐射的效应。文章最后给出了本方法应用的一个算例,并给出了相应的等效线性化方法的计算结果。  相似文献   

A theoretical investigation of bed-form shapes     

Richard?StylesEmail author  Scott M.?Glenn 《Ocean Dynamics》2003,53(3):278-287

The deformation of movable boundaries under the action of an applied turbulent shear stress is well known. The resulting bed forms often are highly organized and nearly two-dimensional, which makes them an intriguing focus of study considering that they are generated in both steady and oscillatory turbulent flows. Many past studies share a common approach in which an infinitesimal perturbation is prescribed and the resulting growth or decay patterns are examined. In this approach, the bed forms are usually sinusoidal and the perturbation analysis does not provide a theoretical prediction of equilibrium bed-form geometry. An alternative approach is suggested here in which the forcing terms (pressure and stress) are prescribed parametrically and the governing equations are solved for the flow velocity and the associated boundary deformation. Using a multilayered approach, in which the bottom boundary layer is divided into a discrete, yet, arbitrary number of finite layers, analytical solutions for the horizontal current and bed profile are derived. The derivations identify two nondimensional parameters, p₀/u₀² and ₀/kh₀u₀², which modulate the amplitude of the velocity fluctuations and boundary deformation. For the case of combined pressure and stress divergence anomalies, the magnitude of the front face and lee slopes exhibit an asymmetry that is consistent with observed bed forms in steady two-dimensional flows.Responsible Editor: Jens Kappenberg  相似文献   

An analysis of Pc3 and Pc4 pulsations at Terra Nova Bay (Antarctica)     

U. Villante  M. Vellante  G. De Sanctis 《Annales Geophysicae》2000,18(11):1412-1421

We conducted a statistical analysis of the physical characteristics of the micropulsation activity (Pc3 and Pc4 range) detected, during the austral summer 1994/95, at Terra Nova Bay (Antarctica, corrected latitude 80.0°S), a station which is few degrees poleward of those where most of the Antarctic measurements in these frequency ranges have been performed. The emerging overview suggests that the correspondence between the pulsation power and the external parameters (solar wind speed, interplanetary magnetic field magnitude and orientation) is significantly stronger than at somewhat lower latitudes. The day-to-day power variability was found to be strictly related to the general level of the geomagnetic activity, and the power level sharply maximizes at local magnetic noon. In the Pc4 range peaks of correlation with the SW speed are found in the dawn and dusk sides of the Earths magnetosphere and the daily variation of the polarization pattern is closely consistent with that found at auroral latitudes and at lower frequencies. In the Pc3 range the correlation coefficient between the pulsation power and the SW speed has maximum values in the local morning, and the frequency of selected events reveals a strong IMF control during closed magnetospheric conditions. The local time dependence of the correlation coefficient between the pulsation power and the cone angle reveals an additional control by the IMF orientation, which becomes more explicit around local noon.  相似文献   

拟建深基坑降水试验岩土工程分析     

吴权  费廷玉 《上海国土资源》2006,(1):37-40

通过对上海轨道交通9号线宜山路车站深基坑降水试验结果分析,得到不同土层受降水影响的岩土工程特征,并对个别土层的实测沉降与由室内试验参数进行估算的沉降进行比较,以获得真实的沉降影响状况,指导深基坑的设计和施工。  相似文献   

CUTLASS Finland radar observations of the ionospheric signatures of flux transfer events and the resulting plasma flows   总被引：1，自引：0，他引：1  

G. Provan  T. K. Yeoman  S. E. Milan 《Annales Geophysicae》1998,16(11):1411-1422

The CUTLASS Finland radar has been run in a two-beam special scan mode, which offered excellent temporal and spatial information on the flows in the high-latitude ionosphere. A detailed study of one day of this data revealed a convection reversal boundary (CRB) in the CUTLASS field of view (f.o.v) on the dayside, the direction of plasma flow either side of the boundary being typical of a dawn-cell convection pattern. Poleward of the CRB a number of pulsed transients are observed, seemingly moving away from the radar. These transients are identified here as the ionospheric signature of flux transfer events (FTEs). Equatorward of the CRB continuous backscatter was observed, believed to be due to the return flow on closed field lines. The two-beam scan offered a new and innovative opportunity to determine the size and velocity of the ionospheric signatures associated with flux transfer events and the related plasma flow pattern. The transient signature was found to have an azimuthal extent of 1900 ± 900 km and an poleward extent of 250 km. The motion of the transient features was in a predominantly westward azimuthal direction, at a velocity of 7.5 ± 3 km.  相似文献