辽宁五龙金矿构造叠加晕研究   总被引：4，自引：0，他引：4  

俞炳 《地质与勘探》2020,56(5):898-914

五龙金矿是辽东矿集区的大型石英脉型金矿床，累计黄金储量超过80吨，平均品位为5.35g/t。随着开采量的增加，目前该矿床开采深度达近千米，保有储量不断减少，步入危机矿山行列，急需开展矿区深部找矿预测研究，实现寻找深部盲矿的有效突破。本次研究在前人研究工作的基础上，分析五龙金矿床矿石微量元素地球化学特征，运用相关分析、聚类分析、因子分析等多元统计方法，对五龙金矿构造叠加晕进行了系统研究。结果显示，五龙金矿成矿过程具有多期次和多阶段的特征，各指示元素在矿体轴向上具有前缘晕、近矿晕、与尾晕相互叠加的现象，该现象是深部盲矿预测的重要依据，反映了深部有盲矿存在的可能性。  相似文献   

井中三分量磁测在旧县铁矿普查中的应用          下载免费PDF全文

李兆令  王石 《山东国土资源》2019,35(10)

井中磁测主要是测量钻孔周围空间磁性体的磁场,从而起到找矿或解决某些地质问题的作用。在铁矿普查中,由于钻孔往往穿过或靠近矿体,且矿体与围岩磁性差异较大,因而井中磁测更容易发现孔旁或孔底盲矿。山东省东平县旧县地区铁矿属沉积变质型,围岩均不具有磁性或磁性极弱,具备了磁法找矿的物性基础。该矿床主矿体埋藏较深,矿体较薄,勘探难度较大。而矿体的发现得益于紧密结合的地质与物探资料的二次开发。其中井中三分量磁测对深部矿体的发现起了重要作用。通过对ZK408孔开展井中三分量磁测,准确预测了井底盲矿的存在,为钻孔继续钻进与否的决断提供了可靠依据,在不保证漏掉磁性体的前提下减少了钻探工作量,节约了生产成本。对勘查区内磁性体的赋存状态和空间位置做出了合理推断,为东平县旧县铁矿探明储量提供了地球物理依据,为下一步地质工作提供了参考意见。井中三分量磁测在寻找深部磁性矿体方面具有科学准确的指导作用,为旧县铁矿深部找矿和外围找矿提供了新思路。  相似文献   

倾斜摄影三维模型数字水印算法     

王刚  任娜  朱长青  景旻 《地球信息科学学报》2018,20(6):738-743

倾斜摄影三维模型作为一种地理数据,其数据安全问题不容忽视,数字水印技术可以为其版权保护提供有效的解决方案。本文基于倾斜摄影三维模型数据特征,根据其垂直方向上的稳定性,提出了一种基于距离映射机制的三维点云数据盲水印算法。首先,提取倾斜摄影三维模型中的点云并对其按照高度值排序;其次,将点云间相邻点的高度差作为信息载体,利用映射思想建立水印信息与水印嵌入位置的对应;最后,通过修改坐标值的奇偶性完成水印信息的嵌入。检测水印时通过顶点提取、排序、水平距离与水印位的映射和统计相邻点水印嵌入位置的奇偶性实现水印信息的提取。实验表明,该算法具有良好的不可感知性,并对平移、裁剪和旋转等常见攻击具有较强的鲁棒性。  相似文献   

突发性灾害事件应急服务策略   总被引：1，自引：0，他引：1  

李娜  秦鹏  卢伟萍 《气象研究与应用》2011,32(4):27-29,99

总结2011年4月17日气象应急服务过程的经验教训,分析了受灾人群的特点,从灾害预警的发布手段着手,探讨完善气象应急服务策略的方法及可行性,为更有效地做好气象应急服务提供参考。  相似文献   

基于城乡一体化发展的关中地区基础设施建设评价   总被引：1，自引：0，他引：1  

吴涛  李同昇 《地域研究与开发》2011,30(4):71-75

在深入分析城乡一体化发展对基础设施建设要求的基础上,基于城乡公共服务均等化目标,从城乡空间、经济、社会文化和生态环境一体化设施4个方面构建了基础设施建设评价指标体系,并以关中地区为例,采用熵值法对其进行评价。结果表明:(1)从整体上看,关中5个地市基础设施建设差异较大,基础设施建设差异与地市经济发展水平差异状况基本吻合,区域经济发展水平、政策和农业发展条件是影响城乡基础设施公共服务均等化的关键因素。(2)关中5个地市基础设施建设存在3种类型:宝鸡市——城市过度建设型,咸阳市——城乡均衡建设型,西安市、渭南市、铜川市——乡村过度建设型。  相似文献   

Geospatially based distributed rainfall‐runoff modelling for simulation of internal and outlet responses in a semi‐forested lower Himalayan watershed     

RAAJ Ramsankaran  U. C. Kothyari  S. K. Ghosh  A. Malcherek  K. Murugesan 《水文研究》2012,26(9):1405-1426

This study presents a Geographic Information System (GIS)‐based distributed rainfall‐runoff model for simulating surface flows in small to large watersheds during isolated storm events. The model takes into account the amount of interception storage to be filled using a modified Merriam ( 1960 ) approach before estimating infiltration by the Smith and Parlange ( 1978 ) method. The mechanics of overland and channel flow are modelled by the kinematic wave approximation of the Saint Venant equations which are then numerically solved by the weighted four‐point implicit finite difference method. In this modelling the watershed was discretized into overland planes and channels using the algorithms proposed by Garbrecht and Martz ( 1999 ). The model code was first validated by comparing the model output with an analytical solution for a hypothetical plane. Then the model was tested in a medium‐sized semi‐forested watershed of Pathri Rao located in the Shivalik ranges of the Garhwal Himalayas, India. Initially, a local sensitivity analysis was performed to identify the parameters to which the model outputs like runoff volume, peak flow and time to peak flow are sensitive. Before going for model validation, calibration was performed using the Ordered‐Physics‐based Parameter Adjustment (OPPA) method. The proposed Physically Based Distributed (PBD) model was then evaluated both at the watershed outlet as well as at the internal gauging station, making this study a first of its kind in Indian watersheds. The results of performance evaluation indicate that the model has simulated the runoff hydrographs reasonably well within the watershed as well as at the watershed outlet with the same set of calibrated parameters. The model also simulates, realistically, the temporal variation of the spatial distribution of runoff over the watershed and the same has been illustrated graphically. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

结合帧选及配准的多帧超分辨率盲复原     

姜超  耿则勋  魏小峰  沈忱 《测绘与空间地理信息》2014,(11)

传统的图像复原技术不仅无法恢复截止频率之外的信息,而且没有考虑不良帧及帧间运动对复原图像质量的影响。通过对传统多帧图像盲复原模型加入运动和降采样因子进行超分辨率扩展得到一个超分辨率盲复原模型,在此基础上,首先以平均梯度和信息熵作为帧选标准,其次结合金字塔光流法对帧选后的图像进行配准,最后利用该模型进行超分辨率盲复原。实验证明,结合帧选和配准的复原方法可以抑制噪声放大及由目标空间位置偏移造成的边缘模糊。该模型是一个有效的超分辨率盲复原模型,复原图像质量优于样条插值和传统多帧盲解卷积算法。  相似文献   

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֣��  ����  ������  ����Ϫ 《大地测量与地球动力学》2014,34(6):157-161

??????????λ???????????μ????????????????????????÷?????????????0.5 m????????????0.2 m??????????????????????????????????????????????????÷???????????????????????2 h????????λ??  相似文献   

可浮动自锁式深海气密采水器的研制   总被引：1，自引：0，他引：1  

李风波  杨灿军  黄豪彩  牛文达 《台湾海峡》2010,29(3):422-427

深海海水中气体的含量可以在一定程度上标识深海资源蕴藏量,因而实现对深海海水的气密采样意义重大.为此设计了一种可浮动的自锁装置,并采用压力自适应平衡原理,实现了对深海海水的气密采样.实验室和海上试验结果均表明深海气密采水器在装上可浮动自锁装置后耐压能力和气密性都得到了有效的提高,对初始压强为1.208 MPa的N2气保压2 h,压力损失不到1.2%,并成功地实现了对960 m深的海水样品的气密采样.此样品中CH4浓度为5.44 nmol/dm^3,CO2浓度为140.6nmol/dm^3.该可浮动自锁式深海气密采水器的研制为深海资源勘探分析提供了必要的技术支持.  相似文献   

Estimation of non-point source pollution loads under uncertain information   总被引：1，自引：0，他引：1  

Ruzhong Li 《中国地理科学(英文版)》2008,18(4):348-355

Many kinds of uncertainties are involved, such as random, fuzzy, grey, unascertained property and so on, in soil erosion process. To exactly predict the non-point source pollution loads, some uncertainties should be taken into consideration. Aiming at the deficiency of present blind number theory being helpless for fuzziness, a novel blind number, i.e. extended-blind number, was introduced by substituting a set of triangular fuzzy numbers （TFNs）, expressed as a-cuts, for interval values in present blind number, and the expected value of extended-blind number was also brought forward by referring to the current blind number theory. On the basis of denoting the parameters of Uni- versal Soil Loss Equation （USLE） as extended-blind parameters, a novel USLE model was established for quantitatively evaluating soil erosion loss and non-point source pollution loads. As a case, the uncertain USLE was employed for predicting the soil erosion loss and non-point source pollution loads of absorbed nitrogen and phosphorus in a dis- trict in the Hangbu-Fengle River basin, in the upstream of Chaohu Lake watershed. The results show that it is feasible in theory to extend blind number into fuzzy environment and reliable on conclusion to apply extended-blind number theory for predicting non-point source pollution loads.  相似文献