矿山坑道內无线电波透視矿体的試驗          下载免费PDF全文

舒世光  许妙立  马孝昶  陈桃 《地球物理学报》1964,13(3):234-242

一、引言无线电波在地球物理探测中的应用,最早的一次试验是由A.A.彼特罗夫斯基于1928年在苏联外高加索某一硫化矿床上进行的,而且得到了由硫化矿体所引起的无线电波“阴影”。  相似文献   

利用卫星测高数据推求中国近海及邻域大地水准面起伏和重力异常研究水   总被引：11，自引：2，他引：9  

许厚泽  王海瑛  陆洋  王广运 《地球物理学报》1999,42(4):465-471

首先对中国近海及邻域（0°-40°N,105°─135°E）内4年的T／P卫星测高数据（1992－10-03-1996－10－09）和1年多的ERS－1卫星测高数据（1992－10－23-1994－01－20）进行了预处理以剔除数据中的粗差影响．然后,对卫星的重复轨迹采用"共线"处理方法得到该海域的平均海平面．在扣除海面地形的影响后得到该海域30'×X30'大地水准面起伏。再分别采用Stokes公式逆运算加FFT技术和最小二乘配置法恢复出该海域30'×30'海洋重力异常．所得到的海洋大地水准面起伏精度为8．5cm,恢复出的重力异常的精度为35×10－5m／s2．  相似文献   

Notes on the Triassic Formations and Faunas of the Yuan-an District,Western Hupeh     

TE-YOU HSU 《地质学报》1937,(Z1)

INTRODUCTION More than a decade has elapsed since the illuminating study of J.S.Lee and Y.T.Chao~1 on the geology of the Yangtze Gorges.The puplica-tion of C.Y.Hsieh and Y.T.Chao's Memoir~2 dated only two years later.So the necessity of restudying this critical region in the light of the  相似文献   

A Third Note on the Statigraphical Unconformities in Kuangsi     

Y.C.HSU 《地质学报》1943,(Z1):64-66

正 As stratigraphical data regarding breaks between the Triassic formations have accumulated as a consequence of recent research in the southern and western parts of Kuangsi, the appearance of a third note on the stratigraphical unconformities in this province to supplement previous papers on the sub  相似文献   

On the Occurrence of Triassic Fauna in the Pemo-Trlassic Succession of Leiyanghsien,South Hunan     

T.K.HUANG  T.Y.HSU 《地质学报》1938,(Z1)

The valley of the Leiho in South Hunan has long been famous for itsnumerous coal-fields.It was Ferdinand von Richthofen~1 who first studiedthe geology of the region and discovered the well-known Gigantopterisflora in the coal measures,which was named by him the Lui-Pa-Kou  相似文献   

Mesozoic Orogenic Movements in the Finghsiang Coalfield, Kiangsi     

K.C.HSU 《地质学报》1937,(Z1)

The Pinghsiang coalfield of Kiangsi province has been repeatedlyvisited by Chinese as well as by foreign geologists most of whom howeverspent much of their time in determining the economic value of the coalfieldand consequently very little attention was paid to the stratigraphic and  相似文献   

Numerical Model of Internal Solitary Wave Evolution on Impermeable Variable Seabed in A Stratified Two-Layer Fluid System     

Chen-Yuan CHEN John Rong-Chung HSU Cheng-Wu CHEN Ming-Hung CHENG 《中国海洋工程》2006,20(2):303-313

1.IntroductionIn mathematics and physics,a soliton is a self-reinforcing solitary wave caused by nonlinear ef-fectsinthe medium.Solitons are found in many physical phenomena(Chou and Shih,1996;Chouand Quyang,1999;Chouet al.,2003;Chenet al.,2004;Wang,2004;…  相似文献   

An application of Miles' theory to Bragg scattering of water waves by doubly composite artificial bars     

Swun-Kwang Wang  Tai-Wen Hsu  Li-Hung Tsai  Sheng-Hung Chen 《Ocean Engineering》2006,33(3-4):331-349

In the present paper, Miles' (1981) theory is implemented to derive formulae for describing the Bragg scattering of water waves for doubly composite artificial bars with different shapes, spacings, relative bar heights, relative bar footprint and the number of bars. The theory has clear advantage in estimating Bragg reflection coefficient for practical applications concerning coastal problems. Experiments of Bragg reflections over doubly composite rectangular artificial bars have also been performed in a wave flume. Key parameters that may lead to the optimal selection of a doubly composite artificial bar are studied. Theoretical solutions are seen to compare fairly well with the numerical computations and the laboratory experiments. Our simulated results reveal that the Bragg resonance for doubly composite artificial bars effectively increases the bandwidth of the reflection coefficient.  相似文献   

On the Range of Validity and Accuracy of Boussinesq-Type Models     

许泰文杨炳达  曾以帆 《中国海洋工程》2004,18(1):93-106

In this paper the range of validity and comparison of accuracy of three Boussinesq-type models (Madsen and Sφrensen, 1992; Nwogu, 1993; Wei et al., 1995; referred to as MS, NW and WKGS, respectively) are analyzed and discussed. The governing equations are extended to the second-order approximations to keep higher-order nonlinear terms. Two key parameters ε and μ representing wave nonlinear and frequency dispersive properties are used to demarcate the limit of applicability for these three models. The accuracy of predictions by each model is compared by the relative errors with and without hlgher-order nonlinear terms in Boussinesq equations. A numerical model is developed based on one-dimensional Boussinesq equations and applied to the case of waves propagating over a submerged bar. The performance and feasibility of each model are tested against laboratory data.  相似文献   

A parabolic equation extended to account for rapidly varying topography   总被引：1，自引：0，他引：1  

Tai-Wen Hsu  Chih-Chung Wen 《Ocean Engineering》2001,28(11)

In this paper, following the procedure outlined by Li (1994. An evolution equation for water waves. Coastal Engineering, 23, 227-242) and Hsu and Wen (2000. A study of using parabolic model to describe wave breaking and wide-angle wave incidence. Journal of the Chinese Institute of Engineers, 23(4), 515–527) and Hsu and Wen (2000) the extended refraction–diffraction equation is recasted into a time-dependent parabolic equation. This model, which includes higher-order bottom effect terms, is extended to account for a rapidly varying topography and wave energy dissipation in the surf zone. The importance of the higher-order bottom effect terms is examined in terms of the relative water depth. The present model was tested for wave reflection in a number of different environments, namely from a plane slope with different inclinations, from a patch of periodic ripples. The model was also tested for wave height distribution around a circular shoal and wave breaking on a barred beach. The comparison of predictions with other numerical models and experimental data show that the validity of the present model for describing wave propagation over a rapidly varying seabed is satisfactory.  相似文献