地下水流动系统在河间地块岩溶渗漏评价中的应用   总被引：3，自引：0，他引：3  

王增银  韩庆之 《地质科技情报》1998,17(2):97-101

在对清江半峡水利枢纽柳山河间地块财溶发育特征分析的基础上,采用地下水流动系统模拟了间地块不同地带流线分布,进而分析了该河间地块岩溶发育规律,评价了岩溶渗漏问题。  相似文献   

甘肃敦煌太古宙英云闪长岩: 单颗粒锆石U-Pb年龄和Nd同位素     

梅华林  于海峰  陆松年  李惠民  李铨  林源贤  左义成 《华北地质》1998,21(2):206

甘肃敦煌地块是塔里木地台早前寒武纪岩石广泛出露区之一,但是否出露太古宙岩石长期存在着争议。本文对该区广泛出露的英云闪长岩单锆石U-Pb年龄和Sm-Nd同位素研究,获得了2.67 Ga的锆石U-Pb年龄和2.68 Ga的Nd模式年龄。证实了敦煌地块存在太古宙基底。同时反映新太古代是该区重要的造壳事件,英云闪长岩派生于亏损地幔。  相似文献   

环渤海的经济开发与减灾          下载免费PDF全文

陈可馨 《海洋开发与管理》1995,12(3):57-60

渤海是一个自然灾豁隐患严重的地区之一，为了使渤海建成一个经济繁荣，环境优美的海区，本文提出必须将渤海区位优势和经济环境条件与防御灾害结合，实现综合开发，提高我国北方开发潜力和综合国力，推动我国现代化进程。  相似文献   

黄河三角洲莱州湾西岸防潮工程海堤断面块体稳定性实验研究     

刘清涛  蒲高军  刘芸 《海洋科学进展》2003,21(2):219-225

以黄河三角洲莱州湾西岸防潮工程海堤断面为工程实例，结合当地的水位及波浪参数，利用物理模型试验的方法，得出了护面块体稳定的极限条件及不同堤坝型式下海堤的冲淤状况，从而验证了海堤护面块体稳定性。  相似文献   

Experimental Research of Hexagon Multihole Armour Block on Breakwater     

Gu Hanbin Sun Jingshi Engineer  Tianjin Research Institute of Water Transport Engineering  Tanggu: Professor  Tianjin Research Institute of Water Transport Engineering  Tanggu: 《中国海洋工程》1995,(4)

This paper introduces a new kind of armour block - hexagon multihole block on sloping breakwater. It has great characteristics such as good interlocking, strong resistance against waves and saving concrete. Through the hydraulic model test, the mechanism of stability of the block has been proved and the relations between stability and wave height, wave period, water depth, slope, laying method, porosity and cushion have been found. The effect of weight on steadiness have also been discovered. Finally, the method of design and some formulas are given.  相似文献   

Design Method of Armour Grate Plates for Sloping Breakwaters     

Wu Guiqiu  Ji Zaihua Sun Xuexin Zhang Jiuzi Associate Professor  First Institute of Oceanography  State Oceanic Administration  Qingdao Associate Professor 《中国海洋工程》1993,(1)

- Laboratory tests have been conducted on the basis of theoretical analysis of stability of armour Grate Plates with reference to 20 structures. Some empirical formulas of statility thickness of Grate Plates have been obtained in consideration of the effects of water depth in front of the structures and critical wave period. The test results have been compared with field data.  相似文献   

F阵广义积的运算保持性质及其应用     

刘文斌  李敏 《中国海洋大学学报(自然科学版)》2006,36(6):889-891

给出F阵广义积的概念,在较为广泛的范围内,讨论F阵与布尔阵的运算保持问题,得到F阵与布尔阵运算一致性的法则,为F阵的研究提供新的方法和视角。  相似文献   

高分辨率光学卫星遥感影像高精度无地面控制精确处理的理论与方法   总被引：3，自引：2，他引：1  

龚健雅  王密  杨博 《测绘学报》2017,46(10):1255-1261

卫星影像全球无地面控制高精度几何定位是卫星摄影测量技术发展追求的主要目标,也是实现困难地区和境外地区测图的关键支撑技术。本文围绕我国国产遥感卫星的技术发展,详细论述了高分辨率光学卫星遥感影像高精度无地面控制几何定位的理论与方法,在天星地一体化全链路误差建模分析的基础上,提出了在轨几何定标理论与方法、稳态重成像几何处理模型与方法及大规模无地面控制区域网平差理论与方法。将本文方法应用于资源三号卫星影像的数据处理,试验结果满足1∶50 000测图精度,证明了理论和方法的正确性。  相似文献   

基于可见光通信的MIMO技术研究现状     

迟楠  乔梁  赵嘉琦  卢星宇 《南京气象学院学报》2017,9(2):113-122

随着灯光与光无线通信技术的结合,基于LED的可见光通信（VLC）越来越受到人们的关注.本文首先探讨了可见光通信的基带处理过程.为了提高室内照明度,LED阵列渐渐被广泛使用,基于此,可见光通信系统中基于LED阵列的MIMO技术也进入研究者的视野,因此,随后介绍了两种VLC-MIMO机制,并介绍了空时分组编码（STBC）在VLC-MIMO系统中的研究进展.作为对比,最后对LTE系统中的物理层处理过程和多天线技术进行技术探讨,并大胆预测了可见光通信基带处理后续可能发展的方向.  相似文献   

Numerical modeling of block structure dynamics: dependence of a synthetic earthquake flow on the structure separateness and boundary movements     

V. I. Keilis-Borok  I. M. Rotwain  A. A. Soloviev 《Journal of Seismology》1997,1(2):151-160

A seismically active region is modelled as a system of absolutely rigid blocks separated by infinitely thin plane faults. The interaction of the blocks along the fault planes and with the underlying medium is viscous-elastic. The system of blocks moves as a consequence of prescribed motion of the boundary blocks and of the underlying medium. When for some part of a fault plane the ratio of the stress to the pressure exceeds a certain strength level a stress-drop (a failure) occurs (in accordance with the dry friction model), and it can cause a failure in other parts of the fault planes. In the model the failures represent earthquakes. As a result of the numerical simulation a synthetic earthquake catalog is produced. The numerical modelling was carried out for three types of structures with increasing of the structure separateness inside of each type and for two types of boundary movements. A synthetic earthquake flow is characterised by several features including the frequency-magnitude relation (the Gutenberg-Richter curve). When the structure separateness increases the slope of the curve changes monotonously in the same direction for all considered types of structures if the boundary movement is the same. The directions of changing of the slope are opposite for two considered boundary movements.  相似文献