ASSESSMENT OF ENVIRONMENTAL QUALITY FOR EARTHQUAKE RISK IN BEIJINGAREA──THE APPLICATION OF GEOGRAPHIC INFORMATION SYSTEM（GIS）          下载免费PDF全文

Han Zhujun  Jiang Pu  Wang Liangmou  Yu Keta  Liu Peixun 《地震地质》1994,16(3):211

ＡＳＳＥＳＳＭＥＮＴＯＦＥＮＶＩＲＯＮＭＥＮＴＡＬＱＵＡＬＩＴＹＦＯＲＥＡＲＴＨＱＵＡＫＥＲＩＳＫＩＮＢＥＩＪＩＮＧＡＲＥＡ──ＴＨＥＡＰＰＬＩＣＡＴＩＯＮＯＦＧＥＯＧＲＡＰＨＩＣＩＮＦＯＲＭＡＴＩＯＮＳＹＳＴＥＭ（ＧＩＳ）ＨａｎＺｈｕｊｕｎ；Ｊｉａ  相似文献   

试论戈壁面及指相意义     

王贵勇  董光荣 《中国沙漠》1995,15(2):124-130

戈壁是荒漠景观的基本类型之一。从沉积相和沉积环境的角度出发，将戈壁定义为干旱大气与砾石堆积体和裸露基岩表面相互作用的界面，由这个面覆盖的区域称作戈壁。在干旱大气环境下，砾石堆积体或基岩表面经历了机械风化作用、盐分风化和盐分微地貌作用、风力作用及荒漠漆发育等外力作用，使其与其它地区的砾石堆积体或基岩表面出现本质的不同。戈壁面特有的地质、地貌特征指示了干旱气候的存在，其中记录的有效信息可为研究干旱区气候、环境变化及新构造运动提供新的途径。  相似文献   

影响牙鲆幼鱼摄食的环境因素实验研究   总被引：10，自引：0，他引：10  

刘慧  朱建新 《海洋科学》1994,18(6):64-67

在不同环境条件下，观察体长３￣６ｃｍ，体重０．２３￣２．７５ｇ牙鲆幼鱼的摄食情况，摄食率最高时环境条件为最适。  相似文献   

Historical patterns of fish stocks     

J. F. Caddy  J. A. Gulland 《Marine Policy》1983,7(4):267-278

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A legal regime for the Arctic?: Interplay with the Law of the Sea Convention     

Olav Schram Stokke 《Marine Policy》2007

The Law of the Sea Convention constrains regional environmental regimes, especially with respect to navigation beyond the territorial sea. Existing soft-law institutions, notably the Arctic Council, have already strengthened environmental governance in the region by (1) improving the knowledge base; (2) preparing practical guidance on risk reduction; (3) highlighting in broader regulatory fora the Arctic dimension of problems like long-range transported hazardous compounds; and (4) supporting the capacity of Arctic states to implement existing commitments. None of those functions would be much enhanced by a legally binding Arctic environmental regime. The political impediments to reaching circumpolar agreement on a single comprehensive legal regime would suggest a flexible approach to norm building that seeks productive interplay with existing institutions.  相似文献   

Understanding the relationship between environmental change and migration: The development of an effects framework based on the case of northern Ethiopia     

James William Morrissey 《Global Environmental Change》2013,23(6):1501-1510

Empirical work on the relationship between environmental stress and human migration has blossomed over the last 10 years. While such work has provided important insights into this relationship, there has been, to date, limited effort expended on generating a generalisable framework for apprehending such interactions. This paper seeks to address this deficit. Based on semi-structured interviews in two sending and four receiving areas in northern Ethiopia, it explores dominant mobility narratives among populations whose livelihoods are exposed to a range of environmental stresses. Analysis of these narratives corroborates findings from other empirical studies on the subject, highlighting how the impact of environmental stress on human mobility can only be understood within the context in which it occurs. To this end the paper attempts to generate a typology of interactions between environmental and non-environmental factors shaping mobility. The typology is based on four effects: additive, enabling, vulnerability and barrier effects. It is thought to provide a generalisable conceptual language which is capable of describing the role of environmental stress in mobility decisions and thereby offering a systematic means for thinking through the processes by which environmental stress impacts upon mobility. While the framework is hypothesised to be suitably generalisable to account for other contexts and other environmental stresses, this still needs to be tested. In addition it is acknowledged that the framework suffers from some major limitations. Most notable is reliance on a conceptually false distinction between environmental and non-environmental factors, and the inability to account for the non-environmental features which shape perceptions of migration.  相似文献   

徐州邱山山体修整、景观改造及环境美化方案探讨   总被引：2，自引：0，他引：2       下载免费PDF全文

万友  唐连权  耿慧丽 《江苏地质》2009,33(4):438-442

对邱山山体进行修整、景观改造及环境美化综合治理,使其成为徐州市高铁站区的一处山体公园,这也是我国矿山地质环境综合治理的一个主要的、可持续发展的方向。  相似文献   

塔里木盆地南缘新生代沉积:对青藏高原北缘隆升和塔克拉玛干沙漠演化的指示   总被引：3，自引：0，他引：3       下载免费PDF全文

郑洪波  贾军涛  王可 《地学前缘》2009,16(6):154

塔里木盆地南缘新生代沉积地层厚达万米以上。研究的叶城和阿尔塔什两个剖面分别厚4500m和7000m,基本代表了塔里木南部的新生代沉积。叶城剖面的底界年龄根据磁性地层测定约为8Ma。阿尔塔什剖面的底界年龄根据海相碳酸盐岩87Sr/86Sr的比值与全球Sr同位素曲线对比,约为30～35Ma。从岩性地层分析,剖面的下部为中新统乌恰群,主要由泥岩和粉砂岩组成,沉积相为低能环境的辫状河和曲流河。剖面的中部是上新统阿图什组,由红色泥岩、砂岩夹薄层砾岩以及埋藏风成黄土构成,沉积环境为冲-洪积扇的中远端。剖面的上部是上新统—下更新统西域组,由中粗砾岩夹块状粉砂岩透镜体(埋藏风成黄土)组成,主要是近源洪积扇沉积和风成沉积,以上地层层序可以进行很好的区域对比。塔里木盆地南缘新生代沉积由新近纪红层向上变化为逆粒序砾岩和碎屑流沉积,记录了青藏高原北缘隆升造成的沉积环境的变化,尤其是干旱化气候的阶段性演化。在约8Ma时,叶城和阿尔塔什两个剖面都发育了风成沙丘沉积。而在阿尔塔什剖面,沙丘沉积之下还发育了一套厚层的膏盐沉积,指示了塔里木盆地南缘在此前后已经相当干旱,只是仅凭这些证据还难以判断沙漠发育的规模。而上新世—更新世阿图什组和西域组中发育的埋藏风成黄土沉积,则指示了塔克拉玛干沙漠在此时已经发育到了相当规模,极度干旱的气候条件(可能类似于现在)已经形成。  相似文献   

末次盛冰期以来南海南部天然气水合物储库变化及其对环境的影响          下载免费PDF全文

王淑红  颜文  宋海斌  樊栓狮 《地球物理学报》2005,48(5):1117-1124

末次盛冰期以来南海南部海平面及海洋底水温度均发生了很大的变化. 为了研究南海南部天然气水合物稳定带厚度在这个过程中的变化情况及其对环境的影响,我们利用相关的计算公式,并编制了计算稳定带厚度的程序,在南海南部的南沙海槽、曾母盆地、巴拉望盆地和苏禄海等四个重点海域选取了35个点进行末次盛冰期及目前稳定带厚度的计算. 计算结果表明,南海南部末次盛冰期和目前的天然气水合物稳定带厚度分别为262m和233m;甲烷资源量分别为269×1013m3和239×1013m3;水合物资源量分别为164×1011m3和146×1011m3. 这说明自末次盛冰期以来,南海南部稳定带厚度平均减薄了29m,平均减薄百分比为12%,同时释放了大约30×1012m3的甲烷,这些甲烷对环境产生了较大影响,对末次冰期的结束起了较大作用.  相似文献   

纳米材料在环保与检测领域的应用研究进展          下载免费PDF全文

郑大中  郑若锋  王惠萍 《盐湖研究》2008,16(4)

论述了纳米粒子的物理化学特性。综述了纳米材料在吸附、光催化分解污染物、杀菌、消毒等环境保护领域的应用;纳米材料在分离富集、无机及有机物料的分析检测方面的应用。对今后工作提出了建议。  相似文献