基于GIS数据库的田野考古地层剖面空间数据挖掘 --以陕西临潼姜寨遗址为例   总被引：8，自引：0，他引：8  

杨林  闾国年  毕硕本  裴安平  盛业华  陈济民  孙懿青 《地理与地理信息科学》2005,21(2):28-31

介绍一种基于地理信息系统(GIS)数据库进行田野考古地层剖面空间数据挖掘的方法。即利用虚拟钻孔扫描剖面地层获得相关信息,从中提取田野考古中所需的各文化层及遗迹的厚度、顶界和底界深度等空间数据。实验结果表明,该方法能自动获取地层信息且数据可信度较高。  相似文献   

TSP203超前地质预报系统在龙潭隧道中的应用     

孙克国  李术才  张庆松 《岩土力学》2006,27(Z1):389-392

TSP203 plus系统是瑞士Amberg工程技术公司最新研制,并已经拥有专利的隧道地震探测仪器,专门为隧道的超前地质预报而设计。介绍了TSP203 plus超前地质预报系统的技术特点和基本测量原理,结合沪－蓉西高速公路龙潭隧道的实例,对照超前地质探孔与实际开挖情况,分析了该系统的实用性和可信性以及在指导施工方面起到的重要作用。  相似文献   

Mesospheric bore events in the equatorial middle atmosphere     

J. Fechine  A.F. Medeiros  R.A. Buriti  H. Takahashi  D. Gobbi 《Journal of Atmospheric and Solar》2005,67(17-18):1774

An all-sky CCD imager designed to measure wave structure of the OH, O₂b(0,1) and OI557.7 nm airglow emission layers in the mesosphere and lower thermosphere (MLT) region has been operated near the equatorial region at São João do Cariri (Cariri), Brazil, (7.5°S, 36.5°W). A large number of gravity wave was observed from September 2000 to September 2002 and among them 64 wave events were identified as mesospheric bores. The bore front shows a horizontal extension greater than 1000 km, and observed in the airglow layers as a complementary brilliance between the three emissions. At the first time mesospheric bore events were observed and analyzed in the equatorial region. Their predominant characteristics, occurrence, local time dependency, morphology and propagation direction will be presented and discussed.  相似文献   

钻孔柱状图中缓冲线绘制技术   总被引：8，自引：0，他引：8  

迟文学  陈建强  许哲平  王东辉  武峥 《地质科技情报》2006,25(5):87-91

介绍了基于钻孔资料的柱状图自动成图技术,阐述了应用数据库方法对钻孔资料进行管理和钻孔柱状图自动成图系统的总体功能、设计思想、实现方法、关键算法及其特点.重点对钻孔柱状图成图过程中绘制缓冲线的关键算法做了详细的叙述.软件实现了对钻孔资料的管理和自动成图,同时以福建省漳州某第四系钻孔的岩性数据为例,说明该系统绘制出的具有缓冲线结构的钻孔柱状图既美观又实用.  相似文献   

Assessment of hydrodynamic competence in extreme marine events through application of Boussinesq–Green–Naghdi models     

《Applied Ocean Research》2017

Here in present work, rotational Boussinesq–Green–Naghdi models were applied to assess the hydrodynamic intensity through the study of the boulder transport in east coast of Philippines during typhoon Haiyan and damage to coastal residences in New Jersey coast due to hurricane Sandy. The hydrodynamic forces were quantitatively analyzed and correlated to both boulder transport distance and the structural damage state in the two cases. The boulder transport was found initiated at vicinity of infragravity swash bores. Inertial force generated by the acceleration in front of the bore was found increasingly large as boulder sizes increased therefore far from negligible as in some other literatures. Besides, transport distances were highly sensitive to wave-heights and boulder sizes, so that onshore positions might be a viable approach of identifying rough magnitudes of paleostorm before other information is available. Fragility functions to predict the damage state of coastal residences due to runups was derived and preliminary validated. Water velocity and the shielding parameter were identified as major predictors of damage while free board and water depth are relatively insignificant. Due to the relative lack of wind damage observed, nearshore hydrodynamics featuring instantaneous nonhydrostatic impact might be the persistent cause of massive littoral processes and low-level structural failure in coastal regions during extreme marine events. Nonhydrostatic phase-resolving models such as Boussinesq-type models would be necessary complements for the intermediate-scale assessment of marine hazards in coastal ocean.  相似文献   

钱塘江涌潮区护岸工程的设计及研究     

宣传丽  罗苑 《海洋学研究》1998,16(3):56-63

丁坝在江道整治及护岸工程中已有比较广泛的应用。丁坝的平面布置、结构型式与丁坝自身的稳定性及护岸效果密切相关。本文在对钱塘江涌潮区护岸丁坝的设计作了初步总结的基础上,指出了在丁坝结构上存在的一些问题,提出了相应的改进方案,并结合抢险修复工程,进行了现场原型试验。试验结果表明,本文提出的改进方案是切实可行的。  相似文献   

基于钻孔数据Delaunay-三角网的矿产储量计算     

张渭军  孔金玲  翁晓鹏 《测绘科学》2010,35(4):57-58

针对传统矿产储量计算的不足,在分析平面点集Delaunay-三角网的算法的基础上,提出基于钻孔点集Delaunay-三角网的算法,并以该三角网为基础,在Visual Basic环境利用组件技术,结合钻孔属性数据库,对任意区域矿产储量进行计算,该法不仅克服算术平均法误差大及其他方法难以自动实现的缺点,而且为管理部门的规划和开采设计提供重要参考信息。  相似文献   

Turbulence and suspended sediment processes in the Garonne River tidal bore in November 2016     

David Reungoat  Xinqian Leng  Hubert Chanson 《国际泥沙研究》2019,34(5):496-508

A tidal bore is a water discontinuity at the leading edge of a ood tide wave in estuaries with a large tidal range and funneling topography. New measurements were done in the Garonne River tidal bore on 14 15 November 2016, at a site previously investigated between 2010 and 2015. The data focused on long, continuous, high-frequency records of instantaneous velocity and suspended sediment con- centration (SSC) estimate for several hours during the late ebb, tidal bore passage and ood tide. The bore passage drastically modi ed the ow eld, with very intense turbulent and sediment mixing. This was evidenced with large and rapid uctuations of both velocity and Reynolds stress, as well as large SSCs during the ood tide. Granulometry data indicated larger grain sizes of suspended sediment in water samples compared to sediment bed material, with a broader distribution, shortly after the tidal bore. The tidal bore induced a sudden suspended sediment ux reversal and a large increase in suspended sedi- ment ux magnitude. The time-variations of turbulent velocity and suspended sediment properties indicated large uctuations throughout the entire data set. The ratio of integral time scales of SSC to velocity in the x-direction was on average TE,SSC/TE,x 0.16 during the late ebb tide, compared to TE,SSC/ TE,x 0.09 during the late ood tide. The results imply different time scales between turbulent velocities and suspended sediment concentrations.  相似文献