贺兰山以北乌兰布和沙漠地下水水化学特征演化规律研究   总被引：5，自引：0，他引：5  

党慧慧  董军  岳宁  董阳  郭映  魏国孝 《冰川冻土》2015,37(3):793-802

乌兰布和沙漠对中国西北部干旱地区气候变化和水文循环过程研究具有指示意义, 以水文地球化学运移为导向, 通过分析33个地下水样, 探讨了该区地下水的补给与演化过程. 结果表明: 巴彦乌拉山浅层地下水水化学类型为Cl^--HCO₃^--SO₄^2--Na⁺; 从吉兰泰盐湖至乌兰布和沙漠, 主要水化学类型变化浅层地下水为Cl^--HCO₃^--Na⁺到Cl^--HCO₃^--SO₄^2--Na⁺, 深层地下水为HCO₃^--Cl^--Na⁺再到HCO₃^--Cl^--Na⁺或HCO₃^--Cl^--Ca²⁺. Gibbs图表明, 研究区地下水的水化学特征主要受蒸发浓缩作用影响和岩石风化作用控制, 大气降雨机制影响甚微. 主要离子相关关系图及饱和指数表明, 岩盐、芒硝、钠长石、方解石、白云石、石膏等矿物的风化溶解是该区地下水主要离子来源. 此外, 氯碱指数和Ca/Na的指示, 说明阳离子交换作用也是形成该地区地下水水化学组分的重要机制.  相似文献   

蒙古国矿产资源分布与中蒙两国合作开发前景论证   总被引：1，自引：0，他引：1  

李靖宇  雷杨 《世界地理研究》2010,19(1):138-146

习近平副主席于2008年6月访问蒙古国,并签署了《中蒙经贸合作中期发展纲要》,标志着两国经贸合作特别是矿产资源合作开发进入了新阶段。蒙古国是中国实施睦邻、富邻、安邻政策的主要对象,矿产资源合作开发又是两国经贸合作的重要领域,为此,有必要对其矿产资源分布情况、开发态势及两国合作开发利弊因素进行分析研究,有针对性地提出加大合作开发力度的对策创意。作者认定,中蒙两国合作开发矿产资源前景光明,必将为双方经贸合作的持久发展注入强劲动力。  相似文献   

数字新会地理空间框架建设与应用     

冯昌添  颜立志 《测绘与空间地理信息》2019,42(5):127-128,132,136

为整合各类数据资源,建设新会区基础地理信息数据库,构建数字新会地理信息公共服务平台,建立健全政府部门间的数据共享机制,本文采用集中式数字县区建设模式建设数字新会地理空间框架,选取5个应用示范来检验数字新会地理空间框架的建设成效。平台在国土资源管理、民政地名服务、政务信息共享等政府管理上得到广泛应用,对实现科学化、精细化、智能化管理和优质服务等起到了很好的推动作用。  相似文献   

Multi-dimensional expansion of urban space through the lens of land use: The case study of Nanjing City,China     

Qiao  Weifeng  Gao  Junbo  Guo  Yuanzhi  Ji  Qingqing  Wu  Ju  Cao  Min 《地理学报(英文版)》2019,29(5):749-761

Journal of Geographical Sciences - The study of multi-dimensional expansion of urban space (MEUS) addresses the laws of urban spatial expansion from all directions and angles. Using Nanjing as an...  相似文献   

河北省地质环境综合信息系统的设计与应用   总被引：1，自引：1，他引：0  

陈勇  胡静  梁邦秋 《国土资源信息化》2009,(3):36-39

笔者通过对河北省地质环境综合信息系统中:数据库管理子系统、三维地质环境信息子系统和河北省地质环境网站的介绍,阐述了该系统的技术特点和主要功能,展示了河北省环境地质勘查院的计算机应用水平,对计算机技术在地学领域的应用提供了一个示例。  相似文献   

测井岩性分析中用VB实现直方图的最优化绘制     

骆淼  潘和平  黄东山 《煤田地质与勘探》2005,33(2):55-57

根据测井岩性解释工作的实际需求,基于可视化程序设计思想,用VisualBasic 6.0开发了直方图的最优化绘制软件。该软件能够自动对数据进行统计分析,剔除异常数据,选择最优参数绘制直方图,且界面友好,功能齐全,易于操作。   相似文献   

气象知识多媒体演示系统的设计与实现     

崔劲松  王建华  赵柳杨  李琳  祖歌 《成都信息工程学院学报》2000,15(4):338-343

介绍了气象知识多媒体演示系统的总体设体、实施方案及在具体实现过程中的主要技术方法  相似文献   

CrustalP-wave velocity and velocity-ratio study in northeast India by a microearthquake survey     

Reena De  J. R. Kayal 《Pure and Applied Geophysics》1990,134(1):93-108

The upper crustal (20 km)P-wave velocity beneath the Shillong Plateau and Nowgong area has been studied by the time-distance plot method. TheP-arrival data of the shallow (20 km) microearthquakes from three temporary networks are used, and the average velocity is found to be 5.55 km/s. The velocity ratio (V _p /V _s ) for the upper crust (0–20 km) as well as for the lower crust (21–40 km) are determined by the Wadati-plot method and station-by-station method. The average value obtained by the two methods is compatible; theV _p /V _s ranges between 1.74 to 1.76. A generalized seismic velocity model of the area is suggested by this study, which has been very useful for microearthquake location.  相似文献   

A new version of the USLE‐MM for predicting bare plot soil loss at the Sparacia (South Italy) experimental site          下载免费PDF全文

Vincenzo Bagarello  Vito Ferro  Vincenzo Pampalone 《水文研究》2015,29(19):4210-4219

Improving empirical prediction of plot soil erosion at the event temporal scale has both scientific and practical importance. In this investigation, 492 runoff and soil loss data from plots of different lengths, λ (11 ≤ λ ≤ 44 m), and steepness, s (14.9 ≤ s ≤ 26.0%), established at the Sparacia experimental station, in Sicily, South Italy, were used to derive a new version of Universal Soil Loss Equation (USLE)‐MM model, by only assuming a value of one for the topographic length, L, and steepness, S, factors for λ = 22 m and s = 9%, respectively. An erosivity index equal to (Q_REI₃₀)^b1, Q_R and EI₃₀ being the runoff coefficient and the event rainfall erosivity index, respectively, with b₁ > 1 was found to be an appropriate choice for the Sparacia area. The specifically developed functions for L and S did not differ appreciably from other, more widely accepted relationships (maximum differences by a factor of 1.22 for L and 1.09 for S). The new version of the USLE‐MM performed particularly well for highly erosive events, because predicted soil loss differed by not more than a factor of 1.19 from the measured soil loss for measured values of more than 100 Mg ha^?1. The choice of the relationships to predict topographic effects on plot soil loss should not represent a point of particular concern in the application of the USLE‐MM in other environments. However, tests of the empirical approach should be carried out in other experimental areas in an attempt to develop analytical tools, usable at the event temporal scale, reasonably simple and of wide validity. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Variation in curve numbers derived from plot runoff data for New South Wales (Australia)     

Hongxia Cao  R. Willem Vervoort  Seth M. Dabney 《水文研究》2011,25(24):3774-3789

The curve number method is a simple one parameter (the curve number) rainfall runoff model. While its theoretical underpinning has been questioned it remains a powerful hydrological tool in the absence of detailed data and is therefore used extensively in hydrological models. This study aims to characterize the variation in maximum retention values (S), which underlie curve numbers, for a range of agricultural treatments across a large spatial area in New South Wales (NSW), Australia. The data used for the analysis spans several decades of rainfall runoff observations. A range of different derivation methods result in variation in mean and variance of S. In particular, methods that emphasize the larger storms result in greater S and thus lower runoff. For larger spatial scales, emphasis on larger storms gives more reliable estimates of S. Systematic variation in S arises from variations in treatment, pre‐runoff soil moisture, rainfall depth, and variations in cover. On the basis of the analysis, a table of curve number values for different land uses found in NSW is presented. The resulting distributions of S and curve numbers provide guidance for rainfall runoff modelling studies in the agricultural important areas of NSW. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献