基于GIS的三维水文地质建模及应用——以咸阳市为例     

万晓明  凌丹丹  马国玺  马宇梅  万小红 《华南地质与矿产》2020,36(1):72-79

为了提升城市地质调查工作的总体服务水平,通过搭建城市地质综合GIS平台,采用人机交互式单元分割-拼接建模方法,以水文地质剖面为基础数据,加入水文地质钻孔、水文地质图、地表高程等多源数据作为约束,首次在咸阳地区构建了建模深度300 m、建模面积3714 km2的水文地质三维结构模型。本次建模的工作顺利完成为研究咸阳地区地下水文地质结构、地下水资源赋存特征提供了三维可视化的数据支撑,也为其他城市开展类似建模工作提供借鉴。  相似文献   

Character of the O–C Variation of Four W UMa Type Stars: AW UMa, AP Leo, AG Vir and AH Vir     

M.A. Hobart  J.H. Peña  C. de la Cruz 《Astrophysics and Space Science》1998,260(3):375-388

An analysis was carried out of the secular period variation of four WU Ma type stars (AW UMa, AP Leo, AG Vir and AH Vir) using some newly determined times of minima as well as others reported in the literature. It was found that two stars show period increases, one a period decrease and the remaining shows no variation in period. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Gravimetric studies of Taal Volcano,philippines     

I. Yokoyama  A. Alcaraz  O. Peña 《Bulletin of Volcanology》1975,39(3):479-489

Taal Volcano is peculiar in its violent explosivity in spite of its low altitude. The surrounding topographies suggest that the origin of Taal Volcano is either a caldera or a graben structure. To confirm the caldera origin one must search for a vast quantity of caldera ejecta balancing with the depression. As a first step, a gravity survey was carried out on and around Taal Volcano, and high gravity anomalies were lound on Volcano Island. The distribution of the gravities may suggest a graben structure overlying a denser layer of igneous material.  相似文献   

Strontium isotope ratios in volcanic rocks from the south-eastern part of the Hellenic arc     

G.G. Pe  A. Gledhill 《Lithos》1975,8(3):209-214

Isotopic ratios of strontium in 9 volcanic rocks from the south-eastern part of the Hellenic arc range from 0.7037 to 0.7075. Within individual series of differentiation, there seems to be a correlation between Sr⁸⁷/Sr⁸⁶ and K₂O/SiO₂.All strontium isotope data for the Hellenic arc are reviewed. Comparable (but slightly smaller) ranges of Sr isotope ratios are found in other island arcs with continental basement. To explain the high values of Sr⁸⁷/Sr⁸⁶ ratio for the Hellenic arc, a selective addition of Sr⁸⁷ from the wall rock, and a process of assimilation involving water, perhaps from subducted sediments, are suggested. Since closely-spaced individual volcanic centres of similar ages have very different Sr isotope ratios, and since the range of Sr isotopic composition in individual centres is quite large, the variation is unlikely to be due to primary variation in mantle composition.  相似文献   

Textural recognition of mudflow deposits     

Georgia G. Pe  David J.W. Piper 《Sedimentary Geology》1975,13(4):303-306

A plot of median grain size against quartile deviation (after Buller and McManus) can be used to distinguish mudflow deposits. A characteristic envelope for poorly sorted streamflow deposits is also defined. Unlike most other sediment transport mechanisms, mudflows appear to deposit sediments with sorting independent of median grain size.  相似文献   

浅析地勘单位提高市场竞争力的策略          下载免费PDF全文

凌玉军 《山东国土资源》2004,20(2):64-66

为提高市场竞争力，地勘单位必须加快企业化进程，建立现代企业制度；必须推进管理创新和技术创新；必须加强品牌建设、人才队伍建设和企业文化建设；必须重视政府和行业协会的保护与支持作用，并积极利用金融市场拓宽融资渠道.  相似文献   

工业相机在历史航片数字化中的应用     

张君华  凌春丽  杨勇  王友昆 《测绘通报》2021,(3):105-108

航空摄影胶片作为历史档案的一种,详细地记录了城市规模、设施等地貌信息变迁。因胶片材质保质期有限,有必要将其进行数字化永久保存。传统的扫描手段效率过低,随着一亿及以上像素的工业级别相机的诞生,使得拍照代替扫描成为可能。本文采用自行制作高精度大幅面胶片翻拍仪,通过精确校检获取准确改正参数,并结合计算机后处理,完成了昆明市2期约8500张历史航空摄影胶片的数字化试验,成果各项指标均符合要求,达到了项目预期目的。  相似文献   

优化非等时距加权灰色-时序组合模型在地铁监测中的应用     

黄浩  苏小文  凌青 《测绘与空间地理信息》2021,44(9):201-204

对某地铁工程沉降数据进行建模预测,可以掌握其变形规律并预测变形趋势.本文将传统非等时距灰色模型引入时距权比系数,按照不同的生成及还原方式构建3种预测模型,并确定最优拟合序列.在此基础上,组合时序模型对残差部分进行处理,建立优化非等时距加权灰色-时序组合模型,结合工程实例进行验证.结果表明,优化非等时距加权灰色-时序组合模型在地铁监测中具有实用性.  相似文献   

我国新一代VLBI数字基带转换器研制进展   总被引：2，自引：0，他引：2  

朱人杰  张秀忠  韦文仁  项英  李斌  吴亚军  王锦清  赵融冰  舒逢春  薛祝和  凌权宝  罗近涛  陈岚 《天文学进展》2011,29(2):207-217

数字化是目前设备研制发展的趋势,介绍了中国科学院上海天文台利用超大规模集成电路结合软件无线电技术,自主研发的我国新一代VLBI数字基带转换器(Chinese Data Acquisition System,简称CDAS).文中描述了设备的工作原理及其组成,并以VLBI观测实验数据证明其可行性.与原有的模拟设备(Anal...  相似文献   

鸟粪石结晶法预处理垃圾渗滤液中高浓度氨氮的研究   总被引：2，自引：0，他引：2  

王健  王长秋  鲁安怀  凌辉  范晨子 《矿物学报》2010,30(1)

利用鸟粪石结晶法预处理垃圾渗滤液中的高浓度氨氮,通过单因素实验和正交实验探讨了pH值、添加剂种类、添加剂比例、反应时间4个因素对氨氮去除率的影响,结合反应过程中的经济成本得出鸟粪石结晶法最佳工艺条件为:pH=9,添加剂为MgC12·6H2O和Na2HPO4·12H2O,n(Mg2+):n(NH4+):n(PO43-)=1:1:1,反应时间15min,氨氮去除率达到90.13%,剩余氨氮在300mg/L以下。通过XRD和ESEM分析,沉淀产物为鸟粪石。实验表明鸟粪石结晶法可以有效去除垃圾渗滤液中的高浓度氨氮,为后续使用生物法处理提供条件,也可以弥补矿物吸附法去除氨氮的不足。可将其与生物法、矿物吸附法等方法组合使用,综合处理垃圾渗滤液。  相似文献