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基于南极半岛周边海域表层沉积物调查以及收集的资料,并通过分析表层沉积物粒度数据研究沉积物类型和分布特征,探讨沉积物的变化规律。南极半岛周边海域的沉积物类型比较丰富,主要分为四大类:砾质、砂质、粉砂质以及泥质沉积物;根据不同的水深和地貌单元可分为陆架(或岛架)碎屑沉积物、陆坡(或岛坡)沉积物和深海沉积物。研究区沉积物属于冰海沉积物,并可划分为残副冰碛物和混合副冰碛物。沉积物的搬运介质以冰川、冰筏为主,海流对沉积物的影响较为明显,沉积物类型随地形变化而呈有规律的分布。 相似文献
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福建深沪湾海滩SSZ1孔粒度分析 总被引：2，自引：0，他引：2
本文对福建深沪湾海滩SSZ1孔 1 2个沉积物样品进行粒度分析处理。分析时采用了频率直方图、频率累积曲线和正态概率积曲线等。结果表明 ,该孔沉积物的成因类型有三种 :即从上往下分别为滨海相沉积、河流沉积和基岩风化沉积 相似文献
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现代沉积物的粒度特征研究表明,不同沉积环境下形成的不同类型沉积物具有不同的粒度特征。叶尔羌河流域沉积物粒度特征表明第Ⅰ类型类似于中间型沉积物,中间型沉积物具有介于流水沉积物和泥石流沉积物之间的特征。第Ⅱ类型类似于流水沉积,具有分选差,粘土和粉沙的含量小于10%等特征。粒度分析能较好地区分不同沉积物类型,反映不同的沉积环境。 相似文献
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福建深沪湾海滩SSX1孔粒度分析 总被引：2，自引：0，他引：2
本文对福建深沪湾海滩ＳＳＺ１孔１２个沉积物样品进行粒度分析处理。分析时采用频率直方图、频率累积曲线和正态概率积曲线等。结果表明,该孔沉积物的成因类型有三种：即从上往下分别为滨海相沉积、河流沉积和基岩风化沉积。 相似文献
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山东月湖的沉积物分布特征及搬运趋势 总被引：12，自引：0，他引：12
1998年 11～ 12月和 1999年 8～ 9月各一个月对月湖进行的野外工作 ,共取得表层沉积物样品 131个 ,应用激光粒度仪并结合传统的筛分法对这些样品进行粒度分析 ,进行矩法计算获得粒度参数。采用Gao命名方法 ,将沉积物划分出 5种主要类型。利用Gao -Collins粒径趋势分析模型 ,计算该区沉积物粒径趋势所显示的沉积物净搬运方向 ,结果表明 ,沉积物从四周向湖中心搬运 ,同时显示湾顶的西部和北部、涨潮三角洲以及湖心等地貌单元是沉积的优势区域。 相似文献
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香港是受台风暴潮影响最严重的地区之一。本项研究是根据近岸及浅海地区沉积物的特征性来分析和获取全新世的时期的台风暴潮信息。根据沉积结构和构造特征,发现有５种类型的沉积层：粉砂质粉土、砂质粒序层、水平或波状层理层、贝屑富集层和含贝屑粉砂层,其中后４种类型与台风暴潮有关。根据沉积物的磁化率分析,上部深度的高磁化率层可能与台风暴潮对现代受污染沉积物的改造致使新老沉积物的混合所致。有孔虫分析显示,风暴沉积层 相似文献
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乌兰布和沙漠不同土地覆被类型粒度特征及空间分异 总被引：1，自引：0，他引：1
对中国沙尘暴源区之一的乌兰布和沙漠进行系统采样,分析不同土地覆被类型的地表沉积物粒度特征及其空间分异规律。结果表明：乌兰布和沙漠地表沉积物以中沙和细沙为主,平均粒径为2.84 φ。沙漠地表沉积物的粒度特征在不同土地覆被类型和不同空间存在明显的分异规律,表明该沙漠的地表沉积物粒度分布是由物源、地形和搬运营力共同作用的结果。乌兰布和沙漠内部最可能成为沙尘暴尘源的有沙漠中部的盐碱地、东北部的耕地和广泛存在于沙漠中的沙丘。根据不同区域的土地覆被类型因地制宜地选取先锋植物种群改善区域地表覆盖状况和地表沉积物粒度组分,是该区域尘源治理的主要手段。 相似文献
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新疆叶城地区第四纪粗砂砾层沉积及其与昆仑山隆起的关系* 总被引：2，自引：0，他引：2
采用粒度分析、岩石岩性分析、砾石统计等方法,本文认为新疆叶城地区第四纪粗砂砾层为冲积-洪积类型。沉积物的组分结构及其空间分布呈带状变化规律。沉积物分布受昆仑山强烈隆起的控制,反映了昆仑山隆起的时代和阶段性。 相似文献
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《The Professional geographer》1988,40(4):471-499
Books reviewed in this article: USA, Eine Geographische Landeskunde , Vol. I, Der Grossraum in Strukturellem, Wandel, 3rd Ed. Helmut Blume . Introduction to Remote Sensing . James B. Campbell . The Sounds of People and Places: Readings in the Geography of American Folk and Popular Music . George O. Carney , ED. Development and Underdevelopment . John Cole . Mobility and Employment in Urban Southeast Asia: Example from Indonesia and the Philippines . Michael A. Costello , Thomas R. Leinbach , AND Richard Ulack . Soviet Asia: Economic Development and National Policy Choices . Leslie Dienes . The Third World City . David Drakakis -Smith . Scholars' Guide to Washington, DC for Cartography and Remote Sensing Imagery (maps, charts, aerial photographs, satellite images, cartographic literature and geographic information systems). Ralph E. Ehrenberg . Population and Development in the Third World . Allan AND Anne Findlay . The Early Mapping of Hawaii . Gary L. Fitzpatrick . Energetics of Physical Environment: Energetic Approaches to Physical Geography . K. J. Gregory , ED. Wildland Recreation: Ecology and Management . William E. Hammitt and David N. Cole . Agricultural Commercialization and Government Policy in Africa . J. Hinderink AND J. J. Sterkenburg . The Dynamics of American Housing . James W. Hughes AND George Sternlieb . Thailand: Buddhist Kingdom as Modern Nation State . Charles F. Keyes . Resolving Locational Conflict . Robert W. Lake , ED. Lands at Risk in the Third World: Local-level Perspectives . Peter D. Little and Michael M. Horowitz , EDS. Nathaniel Southgate Shaler and the Culture of American Science . David N. Livingstone . Regions: The Economics and Politics of Territory . Ann R. Markusen . Wetlands . William J. Mitsch and James G. Gosselink . Historical Geography: Progress and Prospect . Michael Pacione , ED. Loess and Periglacial Phenomena . Marton P$eacsi and Hugh M. French , EDS. Regional Management of Metropolitan Floodplains, Experience in the United States and Abroad . Rutherford H. Platt , ED. Human Cartography: Mapping the World of Man . Janos Szegö . Atlas of Great Lakes Indian History . Helen H. Tanner , ED. The Botany of Mangroves . P. B. Tomlinson . Urban Spatial Traffic Patterns . Rodney Vaughan . The Night After … Climatic and Biological Consequences of a Nuclear War . Yevgeni Velikhov , ED. Industrial Geography . H. D. Watts . Dictionary of Quotations in Geography . James O. Wheeler and Francis M. Sibley . Vermont Townscape . Norman Wiliams , Jr. , Edmund K. Kellogg and Peter M. Lavigne . 相似文献
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《The Professional geographer》2013,65(4):488-489
Book Reviewed in this article: Main Street: Northeastern Oregon: The Founding and Development of Small Towns. Barbara Ruth Bailey. Food Politics: The Regional Conflict. David N. Balaam and Michael J. Carey, eds. The International Economy and Industrial Development: Trade and Investment in the Third World. R. Ballance, J. Ansari and H. Singer. Neighborhoods in Urban America. Ronald H. Bayor, ed. The English Heartland. By Robert Beckinsale and Monica Beckinsale. Regional Dimensions of Industrial Policy. Michael E. Bell and Paul S. Lande, eds. Tension Areas of the World. D. Gordon Bennett, ed. Latin America: an Introductory Survey. B. W. Blouet and O. M. Blouet, eds. Integration and Division: Geographical Perspectives on the Northern Ireland Problem. Frederick W. Boal and J. Neville H. Douglas, eds. Energy and Land Use. Robert W. Burchell and David Listokin, eds. Slopes and Weathering. Michael Clarke and John Small. Alaska's Rural Development. Peter G. Cornwall and Gerald McBeath, eds. The Politics of Park Design: A History of Urban Parks in America. Galen Cranz. World Congress on Land Policy, 1980, Proceedings. Matthew Cullen and Sharon Woolery, eds. Oregon Divided: A Regional Geography. Samuel N. Dicken and Emily F. Dicken. Urban Food Marketing and Third World Rural Development. T. Scarlett Epstein. South Africa: Spatial Frameworks for Development. T. J. D. Fair. Institutions and Geographical Patterns. Robin Flowerdew, ed. Industrialization of U.S. Agriculture, An Interpretive Atlas. Howard F. Gregor. Planning Theory: Prospects for the 1980s. Patsy Healy, Glen McDougall and Michael J. Thomas, eds. Neighborhood Mobilization: Redevelopment and Response. Jeffrey R. Henig. The American Urban System: A Geographical Perspective. R. J. Johnston. Climate, History and the Modern World. Hubert H. Lamb. Climate and History: Studies in Past Climates and Their Impact on Man. T. M. L. Wigley, M. J. Ingram and G. Farmer. China: Railways and Agricultural Development, 1875–1935. Ernest P. Liang. A Desirable Energy Future—A National Perspective. Robert S. Livingston, T. D. Anderson, T. M. Besmann, M. Olszewski, A. M. Perry, and C. D. West. Topothesia: Essays Presented to T. S. Ó Máille. B. S. Mac Aodha, ed. Transportation for the Poor: Research in Rural Mobility. Hal S. Maggied. Land Uses in American Cities. Harold M. Mayer and Charles R. Haves. Industrial Organisation and Location. Philip McDermott and Michael Taylor. Human Adaptability: an Introduction to Ecological Anthropology. Emilio F. Moran. Regional Analysis and the New International Division of Labor. Frank Moulaert and Patricia W. Salinas, eds. The Nuclear War Atlas. Victoriaville, Quebec, Canada: Urbanization and Environmental Quality. Isao Orishimo. The Garden of Eden: The Botanic Garden and the Re-Creation of Paradise. John Prest. Earthfire, The Eruption of Mount St. Helens. Charles Rosenfeld and Robert Cooke. Contest for the South China Sea. Marwyn S. Samuels. The Future of the Wetlands: Assessing Visual-Cultural Values. Richard C. Smardon, ed. Tucson: the Life and Times of An American City. C. L. Sonnichsen. The Geography of Multinationals. Michael Taylor and Nigel Thrift, eds. Impact of Marine Pollution on Society. Virginia Tippie and Dana Kester. Reviving the Industrial City: the Politics of Urban Renewal in Lyon and Birmingham. Jerry A. Webman. Andean Reflections: Letters from Carl O. Sauer While on a South American Trip under a Grant from the Rockefeller Foundation, 1942. Robert C. West, ed. Cartographic Drawing with Computers. P. Yoeli. 相似文献
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《The Professional geographer》1983,35(4):488-524
Book Reviewed in this article: Main Street: Northeastern Oregon: The Founding and Development of Small Towns . Barbara Ruth Bailey . Food Politics: The Regional Conflict . David N. Balaam and Michael J. Carey , eds. The International Economy and Industrial Development: Trade and Investment in the Third World . R. Ballance , J. Ansari and H. Singer . Neighborhoods in Urban America . Ronald H. Bayor , ed. The English Heartland . By Robert Beckinsale and Monica Beckinsale . Regional Dimensions of Industrial Policy . Michael E. Bell and Paul S. Lande , eds. Tension Areas of the World . D. Gordon Bennett , ed. Latin America: an Introductory Survey . B. W. Blouet and O. M. Blouet , eds. Integration and Division: Geographical Perspectives on the Northern Ireland Problem . Frederick W. Boal and J. Neville H. Douglas , eds. Energy and Land Use . Robert W. Burchell and David Listokin , eds. Slopes and Weathering . Michael Clarke and John Small . Alaska's Rural Development . Peter G. Cornwall and Gerald Mc Beath , eds. The Politics of Park Design: A History of Urban Parks in America . Galen Cranz . World Congress on Land Policy, 1980, Proceedings . Matthew Cullen and Sharon Woolery , eds. Oregon Divided: A Regional Geography . Samuel N. Dicken and Emily F. Dicken . Urban Food Marketing and Third World Rural Development . T. Scarlett Epstein . South Africa: Spatial Frameworks for Development . T. J. D. Fair . Institutions and Geographical Patterns . Robin Flowerdew , ed. Industrialization of U.S. Agriculture, An Interpretive Atlas . Howard F. Gregor . Planning Theory: Prospects for the 1980s . Patsy Healy , Glen Mc Dougall and Michael J. Thomas , eds. Neighborhood Mobilization: Redevelopment and Response . Jeffrey R. Henig . The American Urban System: A Geographical Perspective . R. J. Johnston . Climate, History and the Modern World . Hubert H. Lamb . Climate and History: Studies in Past Climates and Their Impact on Man . T. M. L. Wigley , M. J. Ingram and G. Farmer . China: Railways and Agricultural Development, 1875–1935 . Ernest P. Liang . A Desirable Energy Future—A National Perspective . Robert S. Livingston , T. D. Anderson , T. M. Besmann , M. Olszewski , A. M. Perry , and C. D. West . Topothesia: Essays Presented to T. S. Ó Máille . B. S. Mac Aodha , ed. Transportation for the Poor: Research in Rural Mobility . Hal S. Maggied . Land Uses in American Cities . Harold M. Mayer and Charles R. Haves . Industrial Organisation and Location . Philip Mc Dermott and Michael Taylor . Human Adaptability: an Introduction to Ecological Anthropology . Emilio F. Moran . Regional Analysis and the New International Division of Labor . Frank Moulaert and Patricia W. Salinas , eds. The Nuclear War Atlas. Victoriaville, Quebec, Canada : Urbanization and Environmental Quality . Isao Orishimo . The Garden of Eden: The Botanic Garden and the Re-Creation of Paradise . John Prest . Earthfire, The Eruption of Mount St. Helens . Charles Rosenfeld and Robert Cooke . Contest for the South China Sea . Marwyn S. Samuels . The Future of the Wetlands: Assessing Visual-Cultural Values . Richard C. Smardon , ed. Tucson: the Life and Times of An American City. C. L. Sonnichsen . The Geography of Multinationals . Michael Taylor and Nigel Thrift , eds. Impact of Marine Pollution on Society . Virginia Tippie and Dana Kester . Reviving the Industrial City: the Politics of Urban Renewal in Lyon and Birmingham . Jerry A. Webman . Andean Reflections: Letters from Carl O. Sauer While on a South American Trip under a Grant from the Rockefeller Foundation, 1942 . Robert C. West , ed. Cartographic Drawing with Computers . P. Yoeli . 相似文献
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《寒旱区科学》2014,(4):I0001-I0001
Permafrost engineering has been developing rapidly in recent years. Many projects have been undertaken with the latest technologies and show their importance in supporting regional social and economical development. For example, the Qinghai-Tibet Railway has been a milestone project in permafrost engineering. However, when designing and building infrastructures in cold regions, 相似文献
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HAYASHI Hiroaki 《资源与生态学报(英文版)》2014,5(4):395-397
<正>1 Characteristics of Kunisaki GIAS and aims of this research Kunisaki GIAHS in the Kunisaki peninsula and Usa area,Oita,Japan,is a system where forestry,agricultural production,and fisheries are sustained by the strong connection between Sawtooth Oak forest,multiple interlinked irriga tion ponds,and Seto Inland Sea(Vafadari 2013a;2013b;Hayashi 2013).This area receive around 1,500 mm of annual precipitation with a 相似文献
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P. Guilizzoni A. Marchetto A. Lami N. G. Cameron P. G. Appleby N. L. Rose Ø. A. Schnell C. A. Belis A. Giorgis L. Guzzi 《Journal of Paleolimnology》1996,15(3):245-264
A palaeoecological study of an oligotrophic alpine lake, Paione Superiore (Italy), provided a record of historical changes in water quality. Historical trends in lake acidification were reconstructed by means of calibration and regression equations from diatoms, chrysophycean scales and pigment ratios. The historical pH was inferred by using two different diatom calibration data sets, one specific to the alpine region. These pH trends, together with the record of sedimentary carbonaceous particles and chironomid remains, indicate a recent acidification of this low alkalinity lake.Concentration of total organic matter, organic carbon, nitrogen, biogenic silica (BSiO2), chlorophyll derivatives (CD), fucoxanthin, diatom cell concentration and number of chironomid head capsules increased during the last 2–3 decades. When expressed as accumulation rates, most of these parameters tended to decrease from the past century to c. 1950, then all except P increased to the present day. A marked increase in sedimentary nitrogen may be related to atmospheric pollution and to the general increases in output of N in Europe. High C/N ratios indicate a prevailing allochthonous source of organic matter.Finally, the increase in measured air temperature from the mid-1800's appeared to be related to lake water pH before industrialization: cold periods generally led to lower pH and vice-versa. The more recent phenomenon of anthropogenic acidification has apparently decoupled this climatic-water chemistry relationship. 相似文献
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K. F. Walker I. G. Dunn D. Edwards T. Petr H. Z. Yang 《International Journal of Salt Lake Research》1995,4(3):169-222
Quinghai Hu is a large, high-altitude, saline lake in north-western China, and supports a fishery based on an endemic species of naked carp (snow trout). The fish take seven years to attain maturity and a marketable weight of 300 g, and have a lifespan of 14–21 years under the present fishery regime. They seasonally migrate from the lake to spawn over the gravel beds of inflowing rivers, but these areas have been reduced by weirs and irrigation diversions and recruitment may have declined. The population may have been affected also by a 1.85-m fall in the lake level over the past 30 years, and by associated changes in salinity. The fishery was opened to large-scale exploitation in 1958. Yields declined sharply (max. 28,523 tonnes, 1960) as the larger, older fish were removed, and then more slowly (min. 2523 tonnes, 1983). Since 1987 the fish factory has been limited to an annual quota of 1200 tonnes, taken by a fleet of four pair trawlers. Another 800 tonnes are taken by licensed fishermen, mainly using gill nets, and perhaps 1000 tonnes are taken illegally. The estimated total catch in 1992 was 3000 tonnes. New trawlers introduced in 1989–90 substantially increased the factory's catch per unit effort, and in 1990 the quota was virtually filled in one month in a zone within 20 km of the factory. Although this could suggest that the stocks will be conserved if the quota is retained, at least half of the catch in 1989–92 consisted of immature individuals. Trawling operations recently were suspended following a further decline in the catch after 1992. While the new trawlers are capable of a major increase in effort, neither the changing environment, the fish stocks or the present markets favour intensified pressure. Gillnets may provide better control over the minimum size limit and may cause less damage than trawling. Other options to improve the viability and profitability of the fishery include improvements in handling, processing and marketing. Failure to develop the fishery may encourage attempts to introduce exotic fish, at some risk to survival of the local species. 相似文献