中国农业统计地理信息系统及其应用研究   总被引：5，自引：2，他引：5  

阎守邕  肖春生  田青  周艺  王世新 《遥感学报》1997,1(2):152-156,162

如何发展和供应足够的粮食，棉花，油料和肉类产品，是发展国民经济的主要问题，有效地提高各级政府，特别是中央和省部级政府部门的规划，管理和决策水平，是解决问题的重要途径之一，当前，中国每年产生的县级农业统计数据，是唯一能够在县级水平上反映中国农业总体状况及年际变化的权威数据。因此，充分利用这种数据，并在使用过程中不断改善它们的质量，具有特别重要的意义。为此目的，作者研制了中国农业统计地理信息系统（ＣＡ  相似文献   

塔里木沙漠公路沿线的起沙风与输沙强度   总被引：19，自引：12，他引：19  

王训明  陈广庭 《中国沙漠》1997,17(2):168-172

塔里木沙漠公路绝大部分路段穿越流沙地段，风沙活动十分强烈，因此，机械防沙带的设置显得十分关键。由于起沙风的统计分析和输沙强度的定量计算是防沙工程设计中的最主要依据之一。该文在大量统计起沙风和野外实地观测的基础上，进行输沙强度的数值计算及分析后指出：由沙漠边缘向内部深入，起沙风更加东偏，输沙强度更大和更为集中。  相似文献   

10～30d延伸期天气预报方法研究进展与展望   总被引：2，自引：0，他引：2  

Yang Qiuming 《地球科学进展》2015,30(9):970-984

10~30 d延伸期预报是国际大气科学关注的研究热点。这一时间段的预报对开展防灾、救灾工作具有极其重要的价值和意义,该工作需要结合初始气象条件、海洋、大气以及气候的影响因素,其中观测资料具有复杂性、综合性、全球性等,这些科学大数据反映和表征着复杂的自然现象与关系,具有高度数据相关性和多重数据属性,预测过程十分复杂。分析了延伸期预报的各种主流方法,其中重点介绍了动力模式、经典统计和大数据方法 3类预报方法的研究现状,并探讨了各种方法的优势和不足,在此基础上对目前延伸期预报领域存在的问题进行了讨论和总结。对延伸期预报方法的未来发展方向和应用前景给以展望。  相似文献   

Paramètres statistiques de la houle au large de la côte sud-aquitaine     

Stéphane Abadie  Rémi Butel  Hélène Dupuis  Christophe Brière 《Comptes Rendus Geoscience》2005,337(8):769-776

Statistical parameters of waves on the south Aquitaine coast have been determined by comparison of two datasets: in situ local measurements on a short duration and numerical simulation outputs from the WAVEWATCH III model over a period of 6 years and 9 months. Data and simulation results are well correlated in the case of the significant wave height, whereas in the case of the peak periods $(T_{\mathrm{p}})$ and directions $(D_{\mathrm{p}})$, this correlation is lower. This is due respectively to the intrinsic unstable nature of $T_{\mathrm{p}}$ and the narrow distribution of $D_{\mathrm{p}}$. An adjustment of simulation data on measurement is then used to give an evaluation of the wave statistics for the southern fraction of the French Atlantic coast. Eventually, the relationships between the three statistical variables $(H_{\mathrm{s}},T_{\mathrm{p}},D_{\mathrm{p}})$ are analysed in order to determine representative sea states. The classification obtained shows the predominance of swell regimes, distributed on a very narrow angular sector over wind sea regimes. To cite this article: S. Abadie et al., C. R. Geoscience 337 (2005).  相似文献   

Environmental prognostics: is the current use of biomarkers appropriate for environmental risk evaluation?     

Allen JI  Moore MN 《Marine environmental research》2004,58(2-5):227-232

Environmental Prognostics is proposed as an integrated explanatory framework for adverse changes in whole systems, from cells to animals to ecosystems. The aim is to develop such frameworks for the evaluation of "health of the environment" and prediction of consequences resulting from future environmental events based on integrating the reactions of biomarkers for cellular and physiological processes, through conceptual, statistical and computational modelling. These are urgently needed to synthesise complex information on environmental chemistry and injurious effects of pollutants into predicted harmful impact on health of sentinel animals.  相似文献   

Identification of explanatory variables pertaining to attack intensity on U.S. embassies in countries of the Middle East and North Africa     

《Applied geography (Sevenoaks, England)》2017

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Comparing probabilistic predictions with outcomes in petroleum exploration prospect appraisal     

M. H. Nederlof 《Natural Resources Research》1994,3(3):183-189

In the oil industry, uncertainty about hydrocarbon volumes in undrilled prospects generally is expressed as an expectation curve. The curve indicates the probability of exceeding a given amount.After drilling a number of prospects conclusively, that is, we know the amount of reserves in the targets, if any, the question arises about the validity of the prediction. Since the prediction was in the form of a probability distribution, the comparison with a single actual outcome of the process is not straightforward.I propose a specific combination of mainly well-known tests that can be applied in this hindsight analysis to address the following: (1) the measure of location or expectation, (2) the probability of success (3) the shape of the distribution of the nonzero outcomes or success cases, and (4) a measure of rank correlation between predictions and outcomes. Even small numbers of drilled structures may suffice for obtaining conclusive results. Such statistical analysis provides useful feedback for those concerned with the maintenance and control of the prediction system.  相似文献   

近十年国外生态旅游研究状况分析     

李华 《世界地理研究》2009,18(2):111-120

生态旅游产生于全球人类面临生存的环境危机与人们环境意识的觉醒背景之下．生态旅游的热潮已经来临。为了了解国外生态旅游研究的状况并借鉴其经验．以Science Direct外文数据库作为数据来源,选取1997。2008年137篇论文作为统计研究的数据样本．分别从生态旅游研究的时序特征、研究者背景、成果发表、研究内容和区域等方面分析了国外近十年生态旅游研究发展的基本状况。研究表明：近十年来此领域的研究处于一个发展较快的时期．并存在明显的多学科性和综合性．所涉及案例大都是严格的生态旅游或深度生态旅游．发达国家和发展中国家在生态旅游发展的模式和动力存在较大差异,论文以综述评论和调查型居多。与国外对比显示：我国的研究在跨学科性、研究内容、实证研究、对社区的关注等方面均存在较大差异。  相似文献   

2001-2008年我国湿地公园研究的文献学分析   总被引：3，自引：2，他引：1  

吴后建  但新球  王隆富  舒勇 《湿地科学与管理》2009,5(4):40-43

通过对2001-2008年我国国内出版发行的有关湿地公园的著作、学位论文和期刊论文的统计分析,揭示我国湿地公园研究的主题和内容、研究者的分布地区、部门分布状况,确定我国湿地公园研究的合作度、合著率、核心作者和活跃作者群,并确定我国湿地公园研究的热点区域,希望为我国湿地公园研究者和建设者了解和把握中国湿地公园研究现状和发展趋势提供依据。  相似文献   

Earthquake-induced ground failures in Italy   总被引：8，自引：0，他引：8  

Alberto Prestininzi  Roberto Romeo   《Engineering Geology》2000,58(3-4):387-397

The National Catalog of Ground Failures Induced by Strong Earthquakes in Italy (CEDIT), is described. The catalog holds data on ground failures triggered by the earthquakes that occurred in Italy in the last millennium and which had a nominal epicentral intensity equal to or greater than VIII in the Mercalli–Cancani–Sieberg (MCS) intensity scale. The ground effects reported in the catalog are the following: landslides, fractures, liquefaction, surface faulting, and topographic changes of the ground level (subsidence, settlements, tilting, and so on). Each effect is described in terms of seismological parameters of the triggering earthquake, site coordinates and administrative code, lithology and kinematic type of the ground failure. The catalog represents a tool to assess the susceptibility of geologic materials to ground shaking, and to validate predictive models of seismically induced ground displacements (scenarios of earthquake-induced geologic risks). In the context of this study, a simple statistical analysis of the database yielded useful relations between the parameters of the triggering earthquakes and the related effects.  相似文献