南秦岭镇旬盆地层序地层特征及盆地分析   总被引：4，自引：0，他引：4  

唐永忠 《陕西地质》1998,(1)

地处板岩镇断裂与安康断裂之间的镇（安）旬（阳）盆地,泥盆系一中三叠统地层发育齐全,沉积构造及生物化石丰富,岩相较清晰,层序界面保存较完整,是南秦岭陆内造山带开展层序地层与盆地分析研究较为理想的地区。本文对镇旬盆地地层、层序特征进行总结,识别厘定了十一个层序不整合界面,划分了十个不整合界限地层单位,建立了盆地岩石地层格架、层序地层格架,并对盆地的形成、发展、演化进行了初步分析,探讨了沉积作用与矿产的相互关系。  相似文献   

地理信息公共服务平台的总体技术设计研究   总被引：12，自引：4，他引：8  

陈军  蒋捷  周旭  翟勇  朱武  丁明柱 《地理信息世界》2009,7(3):7-11

国家地理信息公共服务平台建设与运行维护是一项超大型地理信息工程。为了切实做好统筹规划、统一设计、规范建设、分步实施,国家测绘局组织开展了总体技术设计研究,制订了技术设计指南。本文介绍了国家地理信息公共服务平台总体设计的基本思路和总体架构。  相似文献   

Small-scale marine fisheries policy in Vietnam   总被引：1，自引：0，他引：1  

Robert Pomeroy  Kim Anh Thi Nguyen  Ha Xuan Thong 《Marine Policy》2009

Vietnam's marine fisheries are considered to be small scale and are concentrated in coastal near-shore waters. This has resulted in heavy pressure on near-shore fisheries resources. Near-shore fisheries are considered by fishers and the government to be over-exploited, causing hardship for many coastal communities. This paper reviews and analyzes changes in policy towards small-scale fisheries in Vietnam over the last two decades. The primary issues facing the small-scale fisheries in Vietnam are to restructure the near-shore fisheries and to address over-capacity. Recommended actions include improved fisheries statistics, resources for provincial fisheries staff, and a coordinated and integrated approach involving a mixed strategy of resource management; resource restoration; economic and community development; and new governance arrangements.  相似文献   

Evaluating conditions for transboundary Marine Spatial Planning: Challenges and opportunities on the island of Ireland     

《Marine Policy》2015

Transboundary cooperation is viewed as an essential element of Marine Spatial Planning (MSP). While much of the MSP literature focuses on the need for, and benefits of, transboundary MSP, this paper explores the political and institutional factors that may facilitate the effective transition to such an approach. Drawing on transboundary planning theory and practice, key contextual factors that are likely to expedite the transition to transboundary MSP are reviewed. These include: policy convergence in neighbouring jurisdictions; prior experience of transboundary planning; and good working relations amongst key actors. Based on this review, an assessment of the conditions for transboundary MSP in the adjoining waters of Northern Ireland and the Republic of Ireland is undertaken. A number of recommendations are then advanced for transboundary MSP on the island of Ireland, including, the need to address the role of formal transboundary institutions and the lack of an agreed legal maritime boundary. The paper concludes with some commentary on the political realities of implementing transboundary MSP.  相似文献   

焦家断裂带南部覆盖区控矿构造带的研究及成矿前景分析     

贺春艳  郭国强  刘聪伟  曹春国  陈大磊  刘红旗 《山东国土资源》2015,31(7)

胶东西北部龙口莱州断裂带南段的朱宋朱桥段,俗称焦家断裂带,是胶东西北部三大控矿构造之一,相继勘查评价了焦家、新城、河西、河东、东季、马塘、望儿山、寺庄等一系列特大型、大型以及中小型金矿床,资源潜力巨大。由于焦家断裂带南段（寺庄以南）被第四系覆盖而去向不明,因此目前对焦家断裂带南延的位置争议较大。根据近年来在该区开展的一系列综合物探研究工作,初步建立了焦家主干断裂带南部覆盖区的断裂构造格架,认为其中F8（徐村院沟北王）断裂为焦家断裂的南延段,并对南部覆盖区的成矿前景进行了分析探讨。  相似文献   

基于计算机模拟模型LESS的落叶松林木质元素影响分析     

许月  谢东辉  漆建波  阎广建  穆西晗  张吴明 《遥感学报》2021,25(5):1138-1151

目前大部分植被辐射传输模型在模拟太阳辐射与植被之间的相互作用过程时,将植物结构进行了简化,只保留了叶片的结构和空间分布特征,而忽略了木质元素(枝干等)对冠层反射特性的影响。计算机模拟模型LESS能够充分考虑植被的多种组分光谱和结构特征,精确模拟植被冠层内部的光散射和辐射过程。本文以地面实测数据为基础,发展了以单木为基本单元的复杂森林三维场景重建基本流程;并在重建森林场景基础上,利用计算机模拟模型LESS模拟森林三维场景反射率,对比分析了森林木质元素对冠层反射率的影响。结果表明,忽略木质元素会引起植被冠层反射率模拟的偏差,特别是在近红外波段,在不同叶面积指数(LAI)下,其相对偏差都在40%以上。高空间分辨率是一个会突出木质元素影响的重要因素,随着空间分辨率提高,偏差也随之增大。不同等级枝干结构均对冠层反射率产生影响,即使忽略最小分枝也会引起17.7%(近红外)的估计误差。因此,在进行定量遥感研究中,必须考虑到忽略木质元素引起的偏差,即使是高LAI森林也无法忽视木质元素的影响。特别是在高分辨率遥感图像中,传统的以统计特征代替三维结构分布的辐射传输模型已经无法满足精度的要求。  相似文献   

Ethical aspects in the economic modeling of water policy options     

《Global Environmental Change》2015

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Food with a visible face: Traceability and the public promotion of private governance in the Japanese food system   总被引：1，自引：0，他引：1  

Derek Hall 《Geoforum》2010,41(5):826-835

The years since 2000 have seen a constant stream of high-profile scandals relating to food safety and food labeling in Japan. One response of Japan’s Ministry of Agriculture, Forestry and Fisheries (MAFF) has been to promote food traceability as a mechanism to improve food safety and to provide reliable information to consumers about their food. MAFF’s main approach to traceability promotion, however, has not involved making traceability mandatory (as has been done in the EU) but encouraging private companies to adopt it. These actions constitute, I argue, an example of the public promotion of private governance. When viewed against the literature on the private governance of food safety and quality, MAFF’s traceability activities are surprising for three reasons: their forms and extent, the relative lack of interest the Ministry has shown in third-party certification, and the way MAFF has responded to concerns about the safety of imported food by focusing almost entirely on domestic traceability. I also argue, however, that looking at the literature from a Japanese perspective suggests that public encouragement is more central to the rise of private governance in the global agri-food system than is usually appreciated.  相似文献   

全球变化下北方农牧交错地带区域适应能力评价模型研究     

陈凤臻  姜琦刚  于显双  崔瀚文 《西安地质学院学报》2010,(3):292-296,323

以可持续发展理论为指导,依据2006年全球变化人类行为计划（IHDP）第六届开放会议精神,参考前人有关生态环境评价框架和指标组合研究,建立了适合北方农牧交错地带特点的区域适应能力评价模型（PSR-RAD）,并对模型的构建思想、参数意义和评价指标的具体计算进行了探讨,以期为全球变化区域响应研究提供参考。针对北方农牧交错地带的实际情况,PSRRAD模型将第四纪地质地貌与现代生态环境研究整合,提出第四纪地质脆弱指数概念,在生态环境胁迫分析中,提出衡量农牧交错地带农牧业环境胁迫程度的地农牧业生产量指数的概念,使生态环境先天与后天胁迫因子、自然与人文因子得以客观体现,对生态环境脆弱性研究的时间和空间尺度均有所拓展。  相似文献   

惠民凹陷唐庄地区沙河街组层序地层和沉积相     

王明健  国景星  袭著纲 《物探与化探》2010,34(1):49-53

针对研究区的区域地质概况,并借鉴了前人的研究成果,利用地震和测井资料识别出了三级层序边界,并对各层序进行了体系域划分,建立了研究区的等时地层格架。在此基础上,通过对岩芯和测井相的综合分析,以体系域为单位进行了沉积相的划分,建立了研究区的精细沉积相模型,并对沉积相的展布特征进行了分析。  相似文献