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geo-environmental
相关语句
  地质环境
    GEO-ENVIRONMENTAL CHANGES ON THE BOHAI BAY MUDDY COAST (Ⅰ):SIGNIFICANCE,GOALS AND METHODS
    渤海湾泥质海岸带近现代地质环境变化研究(Ⅰ):意义、目标与方法
短句来源
    GEO-ENVIRONMENTAL CHANGES ON THE BOHAI BAY MUDDY COAST(Ⅱ): RESULTS AND DISCUSSIONS
    渤海湾泥质海岸带近现代地质环境变化研究(Ⅱ):成果与讨论
短句来源
    RECENT GEO-ENVIRONMENTAL CHANGES IN THE BOHAI BAY COAST
    渤海湾海岸带近现代地质环境变化
短句来源
    The geo-environmental quality in the Pearl River delta is evaluated,and some suggestions are given for disaster mitigation and prevention. This investigation provides basic data for regional planning,marine management,environmental protection and sustainable development.
    项目综合评价了珠江三角洲海洋地质环境质量,提出了减灾防灾建议,为珠江三角洲沿海地区的发展规划、海洋管理、环境保护以及可持续发展提供系统的基础地质资料和科学依据。
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  “geo-environmental”译为未确定词的双语例句
    The development scale, time span and geo-environmental information of the chenier plays a crucial role in the researches of Quaternary geology.
    它的发育规模、时间跨度和所包含的地质古环境信息在第四纪地质研究中占有重要的位置。
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  geo-environmental
It is concluded that the observed geo-environmental behaviour is noticeably a function of changes in the microstructure of illite.
      
In the Kathmandu Valley, the major geo-environmental problems arise from haphazard exploitation of geologic resources, local landslide zones, severe problems of garbage disposal, river flooding and a dramatic river pollution.
      
A geo-environmental map for the sustainable development of the Kathmandu Valley, Nepal
      
It is of interest to a geotechnical or geo-environmental engineer to develop a predictive method of determining the hydraulic conductivity of fine-grained soils, in order to assess its suitability as a liner material.
      
A field-orientated approach, based on a slope performance survey of both natural and existing cutting slopes in similar geo-environmental settings, often tends to provide a more reliable alternative for the design of cutting slopes along new roads.
      
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Geological environmental changes during the recent time in the Bohai Bay muddy coast have been very striking.The main characteristics are: decrease of wetlands and marshes, destruction of cheniers and oyster reefs, landward recession of the MHWST shoreline and seaward progradation of the MLWST shoreline (i.e. widening of the intertidal zone), vertical accumulation of mud and fine sand on the intertidal flat and in estuaries, and extension of cities and towns. These changes, usually on the scale of 10 to 10 ...

Geological environmental changes during the recent time in the Bohai Bay muddy coast have been very striking.The main characteristics are: decrease of wetlands and marshes, destruction of cheniers and oyster reefs, landward recession of the MHWST shoreline and seaward progradation of the MLWST shoreline (i.e. widening of the intertidal zone), vertical accumulation of mud and fine sand on the intertidal flat and in estuaries, and extension of cities and towns. These changes, usually on the scale of 10 to 10 2 a, are different from either the fast changes like earthquake, slide and mud flow or long life geological processes, such as development of cheniers and oyster reefs which need at least several hundred years. We, thus, called these ten to hundred year changes as the 'relatively fast changes', being easily perceived by one or two generations. These are indeed even more dangerous than those instantaneous disasters and long time processes for the muddy coastal zones where have been densely populated and most economically developed both in China and on the world. On the basis of shallow strata geological mapping (1∶50,000), including high resolution Eijkelkamp hand auger investigation for the mid and late Holocene coastal muddy sediments, systematic digital processing was carried out by using MAPGIS and PCI softwares for the maps of the period 1915~1989 with various scales from 1∶100,000, 1∶50,000 to 1∶10,000, and the TM/MSS images of remote sensing of the period 1976~1997 with the scale 1∶100,000. This systematic work was refined by a set of aerophotos of 1950's and 1970's, respectively. Consequently, two dimensional (2D) vectorial pictures were obtained. Through comparisons, these pictures show remarkable geo environmental changes along the Bohai Bay coast in the past hundred years, including 1) the area of the natural wetland and marshes/lagoons decreased by 50%; 2) as two famous components, the cheniers and oyster reefs were seriously damaged; 3) the shoreline of the mean high water spring tide (MHWST) has been retreated for several hundred meters while the shoreline of the mean low water spring tide (MLWST) has been extended farther seaward. The intertidal zone was widened from 3 to 5 km; and 4) cities and towns dramaticallly extended. As a part of the existing coastal geological mapping investigations along the Bohai Bay coast, the digital processing of various maps and topographic images is useful for the coastal sustainable development and infrastructure management

淤泥质海岸带地区 1 0~ 1 0 2 a级别的相对快速的“缓变型地质环境变化” ,主要包括水体、湿地和盐沼 -湖退化或消失、贝壳堤和牡蛎礁被破坏、村镇和城市面积剧增、海岸线 (平均大潮高潮线 )被侵蚀后退、潮间带和近海河道被淤积、潮间带变宽变缓等。这些变化 ,已对我国东部沿海地区的经济和社会发展造成不利影响 ,并将对该类地区的可持续发展构成潜在威胁。在该类地区正在进行的 1∶5 0 0 0 0区域地质调查 ,充分发挥其高精度和规范化的优势 ,并辅以对近百年来不同时期的地形图、航空照片和遥感影像的数字化处理和对比研究 ,试图对这些变化做出形象、直观和定量的二维 (2D)表达。本文介绍的是正在渤海湾海岸带进行的工作 ,充分显示出地质调查服务社会的公益性、基础性和战略性特点。对这一研究方向所显示的巨大潜力的进一步开发 ,将可能形成供政府决策部门和各方面用户广泛利用的、可二次开发的平台 ,从而使该类地区的可持续发展建立在对近现代地质环境变化详细了解的扎实基础之上。

As a branch of the National Land Resource Investigations, the coastal geological work has been carrying out on both coastal plain and intertidal zone along the Bohai Bay, China. This work, focused mainly on the late Pleistocene and Holocene shallow strata and the modern surficial morphological changes, helps to find out the facts of the recent and present day coastal geo environmental changes, tendencies of the changes and potential influence on the coastal sustainable development. Coastal mapping is composed...

As a branch of the National Land Resource Investigations, the coastal geological work has been carrying out on both coastal plain and intertidal zone along the Bohai Bay, China. This work, focused mainly on the late Pleistocene and Holocene shallow strata and the modern surficial morphological changes, helps to find out the facts of the recent and present day coastal geo environmental changes, tendencies of the changes and potential influence on the coastal sustainable development. Coastal mapping is composed of four fold objectives including the bedrock study (pre Quaternary), early to middle Pleistocene study, late Pleistocene to Holocene multidisciplinary study and, finally, as most important, late Holocene and present day multidisciplinary study with high resolution. Coastal comprehensive studies are mainly dealing with shoreline migration, morphological changes, accumulation rate in the past century. The common procedures as normal routing include detailed field logging, portable GPS loc, leveling measurement by Geodimeter for each core and Eijkelkamp coring with distribution density of 1core/1.6~3.3km 2, specific mechanical drilling boreholes of 30~100 m in depth. Detailed laboratory work consists of palaeobiostratigraphy (foraminifera, ostrocoda and pollen grain analyses), OSL/ 14 C/ 210 Pb/ 137 Cs/U series dating, palaeomagnetic study and sedimentary analysis, etc. Pseudo 3D representation has been given for the coastal mapping areas, especially for the middle to late Holocene period with time resolution of less than 1 000 years.

渤海湾泥质海岸带的近现代地质环境变化研究 ,是通过两种形式 (大比例尺区域地质调查和综合研究 )在两个方面即垂向的浅表沉积物和平面上的地表形态变化同时展开的。( 1 )海岸带深覆盖区区域地质调查 ( 1∶5 0 0 0 0 )分为 4个层次 :基底 (前第四纪 )研究、早中更新世研究、晚更新世 -全新世多学科综合研究、中晚全新世 -现代多学科高分辨率综合研究。( 2 )海岸带综合研究采用多期图形对比、短半衰期同位素示踪与测年等方法 ,围绕近百年来地表形态、沉积速率变化及海岸线变迁展开。 ( 3)正在形成的系统工作方法 :包括Eijkelkamp槽型取样器获取浅表地层的无扰动岩心、岩心编录、手持GPS定位 ;少量辅助性机械钻孔岩心( 30~ 1 0 0m ,全取心 )研究 ;地质点水准 (与国家高程联网的 )测量 ;有孔虫、介形虫、孢粉、OSL、1 4 C测年 (加速器质谱法与液体闪烁计数器法 )、磁学研究和 2 1 0 Pb/1 37Cs测年 ,以及多期图形 (历史地图、地形图、航片与卫星遥感影像 )的计算机处理与对比、假三维表达的综合研究等。

This article is a general and brief view of our results achieved in the muddy coastal geological investigation, a part of the National Land Resource Investigations, on the Bohai Bay coast during the recent years. (1) For the coastal Holocene regime, four types of stratigraphic patterns are found (A) Traditional ‘triple' subdivision of the Holocene strata often exist on the distal belt apart from the shore; (B) Interfingering between marine and terrestrial deposits;(C) A big gas, lasted 10 to 20 ka , existed...

This article is a general and brief view of our results achieved in the muddy coastal geological investigation, a part of the National Land Resource Investigations, on the Bohai Bay coast during the recent years. (1) For the coastal Holocene regime, four types of stratigraphic patterns are found (A) Traditional ‘triple' subdivision of the Holocene strata often exist on the distal belt apart from the shore; (B) Interfingering between marine and terrestrial deposits;(C) A big gas, lasted 10 to 20 ka , existed in between the LGM and early Holocene. Holocene deposition started directly from brackish deposits; and (D) For depressions such as estuary, channel and neotectonic subsiding trench in the proximity of shore, marine transgression may start as early as 15 ka in the working area. No sharp boundary between Pleistocene and Holocene can be found because successive brackish deposition existed after LGM to the early Holocene. (2) ‘Binary structure', characterized by change from open tidal flat with seawater influence to the lagoonal and salt marshy environment with marine and terrestrial influences during the mid to late Holocene. For easier use in field, this ‘informal units' are called as the ‘Gray Unit' and ‘Yellow Unit', respectively. (3) A working hypothesis of correlating between the oyster reefs and cheniers suggests that the building up of the oyster reef body was simultaneously with the thriving of molluscan shells on the muddy intertidal zone during the calm period; while the reworked oyster shells/shelly fragment beds, intercalated in the reef body were in phase with the chenier construction (i.e. to pile up of the shells) during the unstable period. (4) Coastal mapping enables pseudo 3D representation of recent and present geo environmental changes of the late Holocene with resolution of less 1 ka. A paradigm is exemplified that a buried depression, being earlier than the Chenier Ⅱ, existed at the landward side of the chenier. A buried linear ridge, NNW direction, margining the depression, recognized to be controlled by the same directional neotectonic movement. (5) Primordial reason of the Circum Bohai Bay coastal plain development is proposed as a working hypothesis that is the multi genetic processes from the linear bar (barrier island) lagoon/salt marsh system to the beach ridge (the middle to upper part of chenier body) lagoon/salt marsh system. As a necessary compensation for the positive relief (i.e. piling up of the chenier bodies), the negative relief (lagoonal depression) occurred at the front of chenier body as a result of the winnowing up of shells from the muddy intertidal flat.

渤海湾泥质海岸带国土资源大调查以其特有的方法、手段和要求 ,获得了一批带有地质调查特点的、关于全新世地层与近现代地质环境变化的阶段性成果 ,主要包括 :1 )该地区海岸带全新世地层具有 4种沉积类型 :(A)远离海岸的传统的“三分”型 ;(B)海相层与陆 (海陆过渡 )相层的多次交替 ;(C)末次冰期后期未接受沉积 ,全新统半咸水的海陆过渡相直接覆于历时约 1 0~ 2 0ka的沉积间断面上 ,向上 ,进一步发育为海相层 ;(D)沿海低洼地区在末次盛冰期后的晚更新世晚期即已进入海侵阶段 ,晚更新世晚期与全新世早期的海陆过渡相沉积是连续的 ,向上继续发育海相层。 2 )从以海水影响为主的开放潮坪 (及浅海区 )环境转变为 (陆源影响逐渐加强的 )湖 -盐沼环境 ,是研究区中晚全新世地质环境转变的重要特征 ,建立了表征这两种不同环境的非正式地层单位 (“灰色单元”与“黄色单元”)。 3)牡蛎礁与贝壳堤的对比方案 ,以牡蛎礁对应潮坪的贝类繁盛期 ,牡蛎礁中的水平再搬运夹层和 /或上覆泥质盖层(往往形成“岭地”)对应贝壳堤成堤。 4)大比例尺区调地质点 (浅孔 )揭示了中晚全新世 (近现代 )地质环境变化 ,编绘出...

渤海湾泥质海岸带国土资源大调查以其特有的方法、手段和要求 ,获得了一批带有地质调查特点的、关于全新世地层与近现代地质环境变化的阶段性成果 ,主要包括 :1 )该地区海岸带全新世地层具有 4种沉积类型 :(A)远离海岸的传统的“三分”型 ;(B)海相层与陆 (海陆过渡 )相层的多次交替 ;(C)末次冰期后期未接受沉积 ,全新统半咸水的海陆过渡相直接覆于历时约 1 0~ 2 0ka的沉积间断面上 ,向上 ,进一步发育为海相层 ;(D)沿海低洼地区在末次盛冰期后的晚更新世晚期即已进入海侵阶段 ,晚更新世晚期与全新世早期的海陆过渡相沉积是连续的 ,向上继续发育海相层。 2 )从以海水影响为主的开放潮坪 (及浅海区 )环境转变为 (陆源影响逐渐加强的 )湖 -盐沼环境 ,是研究区中晚全新世地质环境转变的重要特征 ,建立了表征这两种不同环境的非正式地层单位 (“灰色单元”与“黄色单元”)。 3)牡蛎礁与贝壳堤的对比方案 ,以牡蛎礁对应潮坪的贝类繁盛期 ,牡蛎礁中的水平再搬运夹层和 /或上覆泥质盖层(往往形成“岭地”)对应贝壳堤成堤。 4)大比例尺区调地质点 (浅孔 )揭示了中晚全新世 (近现代 )地质环境变化 ,编绘出约 45 0 0calB .P .以来小于 1ka时段的二维、假三维环境系列图。一个实例是Ⅱ贝壳堤向陆侧的洼地甚至早于?

 
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