浅析旅游地图的网络化发展     

许建中  徐剑  任小龙 《现代测绘》2008,31(2):45-46

旅游地图是人们旅行和导购导游的常用工具,对各地旅游业的发展具有十分重要的推动作用。本文论述了网络化旅游地图发行方式上所具有的优势,分析了当前旅游地图网络化的发展现状及存在问题,探讨了加快旅游地图网络化发展的策略与措施。  相似文献   

化探背景与异常划分中的C型转换法     

陈明  范继璋  矫希国 《吉林大学学报(地球科学版)》1996,(2)

化学背景与异常在统计学上的差异同时表现在浓度和变差两个方面。在划分背景与异常时,把这两方面信息提取出来并作显化处理,使背景与异常的差别更大,以利划分,这就是Ｃ型转换的基本思想。介绍了Ｃ型转换法的基本原理及其在条件模拟和实际金矿区中的应用。  相似文献   

人工神经网络在白云岩类型识别中的应用     

蔡煜东  姚林声 《岩石矿物学杂志》1994,13(1):51-54

利用地球化学数据,运用人工神经网络方法对美国密苏里州东南Ｂｏｎｎｅｔｅｒｒｅ组（寒武纪）滨海相的白云岩进行了分类、识别,判别率达１００％,结果表明,该方法性能良好,可望成为岩石分类、判别的有效手段。  相似文献   

深部矿产资源立体地球化学勘查方法技术体系     

史长义  王惠艳 《地质学报》2022,96(11):3705-3721

深部矿产资源的勘查是战略性矿产资源勘查的一个重要方面。找矿实践证明，化探方法技术在矿产勘查乃至深部找矿中发挥了重要的、不可或缺的作用。找矿工作的不断深入和找矿难度的不断加大，促使化探方法技术不断的发展和完善，在传统方法技术的基础上，研发出了许多新的方法技术。本文从方法论和系统论的角度出发，对现有的找寻深部隐伏矿盲矿的有效化探方法技术进行了系统的归纳和总结，提出了立体地球化学勘查方法技术体系的概念，将立体地球化学勘查方法技术划分为地面地球化学测量方法技术和地下地球化学测量方法技术，建立了深部矿产资源立体地球化学勘查方法技术体系。不同的方法技术有不同的优势和不同的适用条件，实际工作中应当根据不同的勘查阶段，不同的勘查目的和不同的地质地球化学条件选择不同的立体方法技术组合才能发挥出最大效益，取得最大效果。  相似文献   

快速城镇化进程中珠江三角洲高铵地下水赋存环境及驱动因素          下载免费PDF全文

吕晓立  刘景涛  韩占涛  朱亮  杨明楠  李海军 《中国地质》2021,48(6):1770-1780

地下水中高浓度的铵态氮对生活饮用水安全及生态环境存在潜在威胁。相比较硝态氮，高浓度的铵态氮不仅有各种人为来源，天然沉积环境更是造成高铵地下水的主要成因。本文以城镇化快速发展的珠江三角洲为研究区，运用数理统计、主成分分析等方法深入探讨了研究区高铵地下水的赋存环境特征及驱动因素。结果表明，研究区地下水中NH₄⁺质量浓度介于未检出~180 mg/L。研究区1539组地下水样品中，NH₄⁺质量浓度大于10 mg/L的高铵地下水69组，其中含NH₄⁺质量浓度大于30 mg/L的高铵"肥水"23组。对比2005-2008年历史水化学数据，2009-2018年新增建设用地孔隙含水层高铵地下水样品比例增加25%。高铵地下水呈斑块状分布于三角洲平原区第四系底部低洼的基底、洼地等退积层序发育的淤泥质含水层中。淤泥层等富含有机质和总有机碳的沉积层是珠江三角洲地区的"生铵层"，有机氮的矿化是三角洲平原区城市化孔隙含水层中高铵地下水的主要驱动力。城镇化扩张引起生活污水及富铵工业废水的泄漏入渗是城乡结合部高铵地下水铵氮的重要来源。三角洲平原区中性至弱碱性富含有机质的还原环境是高铵地下水的主要成因。风化溶滤、阳离子交换吸附、海陆交互作用是珠江三角洲高铵地下水质演变的主要水文地球化学过程。  相似文献   

Enhancement of radon signals in geophysical studies with the track technique     

A. Tidjani  M. Monnin  J -L. Seidel 《Pure and Applied Geophysics》1990,132(3):495-504

The existence of a suspected geological fault has been confirmed using Solid State Nuclear Track Detectors (SSNTDs) by measuring radon concentration variations in the upper soil above its inferred position. The results obtained prompted us to increase the natural radon signal in the soil, using an additional radon source; this enhancement technique, has been experimentally checked with SSNTD detectors.On leave from Faculté des Sciences, Laboratoire des D.S.T.N. Université de Dakar, Dakar-Fann, Sénégal  相似文献   

Ecological risk assessment for heavy metal contamination of a new consideration Agricultural soils     

《中国地球化学学报》2006,25(B08):123-123

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Attenuation of aqueous metal transport at two natural acid rock drainage occurrences in the Yukon Territory, Canada     

Y.T. John Kwong 《中国地球化学学报》2006,25(B08):229-230

Naturally acidic drainage associated with pyritic black shale has been observed in many locations in the Yukon Territory. While not necessarily linked to known mineral deposits, most of these natural acid rock drainage occurrences show elevated dissolved concentrations of trace elements, especially zinc, nickel, copper, cadmium and arsenic. Based on field observations, microbial investigation, chemical analyses and geochemical modeling, the fate and transport of potentially deleterious elements at two natural acid drainage occurrences with slightly different settings are examined. The Macintosh Creek is a small, acidic stream （pH 2.98-3.40）, 2 km long, located in the Macmillan Pass area of east-central Yukon amidst known sedimentary exhalative massive sulfide mineralization but remains undisturbed by exploration activities. Its trace metal content is apparently derived from groundwater discharges, which gave as much as 5.0, 2.5, 0.7, 0.13 and 0.03 mg/L ofZn, Ni, Cu and As, respectively. Interaction and sorption reactions with algal mats, biofilms and iron oxyhydroxides appear to be the dominant mechanisms attenuating aqueous contaminant transport along the stream. Cryogenic precipitation further consolidates the ferricrete formation and reduces the mobility of the sorbed metals. The tributaries of the Engineering Creek along the Dempster Highway in northern Yukon drain through a series of dolomite, phyllite, argillite, limestone, black shale, sandstone and conglomerate with no known concentration of mineralization. In this area, the water chemistry fully reflects the local geology with acidic streams invariably associated with black shale occurrences. Groundwater seeps in the headwaters area of the km-180 Creek completely enclosed in black shale gave pH 3.0 and as much as 148, 39, 2.9 and 9.1 mg/L of Zn, Ni, Cu and As, respectively. Sorption with iron oxyhydroxide and organic matter appear to dominate the attenuation of contaminant transport along the stream. However, once entered into carbonate-dominated terrains, secondary carbonate minerals exercise additional geochemical control on the local water chemistry as a result of neutralization.  相似文献   

A GIS-based automated procedure for landslide susceptibility mapping by the Conditional Analysis method: the Baganza valley case study (Italian Northern Apennines)   总被引：14，自引：0，他引：14  

Aldo Clerici  Susanna Perego  Claudio Tellini  Paolo Vescovi 《Environmental Geology》2006,50(7):941-961

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A study on the geochemical characteristics of Upper Permian continental marginal arc volcanic rocks in the northern segment of South Lancangjiang Belt     

沈上越冯庆来  魏启荣张志斌 张虎 《中国地球化学学报》2006,25(3):216-222

1IntroductionThe northern segment of the South LancangjiangBelt refers to the terrain about200km east of theYunxian-Lingcang granite in the South LancangjiangBelt(Fig.1).During the seventh Five-Year Plan peri-od,Mo Xuanxue et al.(1993)undertook the resear…  相似文献