海水到底是什么颜色?     

叶澍 《海洋世界》2016,(4):6-7

正海水和普通水一样,都是无色透明的,海洋色彩是由海水的光学性质和海水中所含的悬浮物质、海水的深度、云层的特点及其他因素决定的。我们知道太阳光的可见光中包含红、橙、黄、绿、青、蓝、紫七种波长的色光。这七种光的波长从红光至紫光逐渐变短,由这些色光就构成了白光。而太阳光照射到海水中被吸收的程度  相似文献   

伊斯法罕，世界的一半     

蔡天新 《地图》2011,(5):138-139

11世纪中叶,土耳其的塞尔柱王朝曾在伊斯法罕建都,虽说一个半世纪以后即衰败了,却留下一座圆顶的大清真寺,内外装饰着精美的几何图案。四个世纪后,这座城市才达到了辉煌的顶点,波斯萨非王朝的国王阿拔斯大帝迁都此地,修建了许多寺院、旅店、林荫大道、公共浴室和大广场,使之成为17世纪最美丽动人的城市之一。  相似文献   

穿越伊斯坦布尔     

冯艺 《广西地质》2011,(11):43-45

美丽的博斯普鲁斯海峡从南到北,把伊斯坦布尔分隔成了东西两部分,东部在亚洲,西部在欧洲。横跨海峡上空的欧亚大陆桥,联结着两大洲,联结着这个巨大城堡的东部与西部。或许,居住在这座城堡的土耳其人,才会觉得自己是真正的欧洲人。  相似文献   

Digital Identification of Ecosystem Structure in the F?rt?na Valley of the Ka?kar Mountains in the Rize City of Turkey     

Cagasan KARACAOGLU  Selim Sualp CAGLAR 《山地科学学报》2014,11(2):421-428

Identifying the structure of protected mountain ecosystems is an important task for understanding conservation sustainability. The study area, the F？rt？na Valley, located in the Rize City on the Eastern Blacksea Coast, is one of the biological hotspots and a National Park of Turkey. In order to identify the structure of mountain ecosystems, we generated a GIS database for the main environmental parameters of the study area, including elevation, slope and aspect layers for topographic structure, 10 year mean values of Normalized Difference Vegetation Index（NDVI）, data for vegetation structure, annual mean temperature and precipitation layers for climatic structure, main soil groups for soil structure and stream flow accumulation, stream flow length and stream order layers for hydrological structure .To identify the complex relations among environmental factors in the study area a data reduction method is applied with Principal Component Analysis （PCA）. PCA is performed using data of 16 layers from Geographical Information Systems （GIS）. PCA analysis reduced 16 dimensions into 5 dimensions containing 75% of the variation in all data. It is also revealed that the topographic structure, mainly altitude, dominates the ecosystems of the F？rt？na Valley, but it should be considered that the interactions of environmental factors in an ecosystem dynamics are very complex. The ecosystem structure is determined by the environmental factors direct or indirect effects on energy regulation of an ecosystem. Therefore the relationship between topographic elements and other abiotic-biotic elements in the Fcrtcna Valley are important for environmental assessment and sustainability of a protected area, and these effects are explained in this study.  相似文献   

穿越伊斯坦布尔     

冯艺 《南方国土资源》2011,(11):43-45

美丽的博斯普鲁斯海峡从南到北,把伊斯坦布尔分隔成了东西两部分,东部在亚洲,西部在欧洲。横跨海峡上空的欧亚大陆桥,联结着两大洲,联结着这个巨大城堡的东部与西部。或许,居住在这座城堡的土耳其人,才会觉得自己是真正的欧洲人。  相似文献   

Factors Controlling Low Uranium and Thorium Concentrations in the ?ay?rhan Bituminous Shales (?BS) in the Beypazar? (Ankara) Area, Turkey     

Berna Yavuz PEHLIVANLI  ?ükrü KO?  Ali SARI  Hilal ENGIN 《《地质学报》英文版》2014,88(1):248-259

In this study uranium and thorium contents and depositional characteristics of ay rhan bituminous shales（ BS）, west of Ankara（central Anatolia）, are investigated. Samples used were collected from boreholes opened by Park Holding Ltd. A total of 25 samples were taken from bituminous shale levels in boreholes drilled at 6 different locations in the study area. The H rka formation which hosts bituminous shale deposits is a volcanosedimentary sequence and all lithofacies indicate that a lacustrine environment where the water level was continuously changed. In addition to hydrocarbon generation potential, bituminous shales also accumulate significant amount of radioactive elements such as uranium and thorium. The average uranium and thorium concentrations of BS（1.83/2.62 ppm） are much lower than averages of UC, NASK and PAAS（uranium： 2.70/2.66/3.10 ppm; thorium： 8.50/12.30/14.60 ppm）. Low uranium contents in comparison to those of similar lacustrine environments might be attributed to that waters of depositional environment of BS contain low concentration of dissolved uranium and redox conditions were of oxic and dioxic character. Correlation data indicate that U and Th have a similar source and are associated predominantly with clays and phosphates and dominantly with organic material. Radioactive elements in the basin might be derived from Paleozoic granites and metamorphites（e.g. gneiss, schist） which comprise the basement and volcanism which was active in the region throughout the Miocene period. These elements are probably associated with uraniferous phosphate minerals（e.g. autunite, torbernite） which occur in granite, gneiss and schist. BS with average TOC content of 10.96 % shows very good/perfect source rock potential. Positive correlations between Gamma-Ray values and U, Th and K concentrations imply that radioactivity might be originated from these three elements.  相似文献   

水的战争：气候变化可能导致冲突     

《海洋世界》2006,(4):4-4

以色列．约旦和巴勒斯坦；土耳其和叙利亚；安哥拉和纳米比亚；埃塞俄比亚和埃及。  相似文献   

科学发展语境下的“共享”意识     

和平 《河南地质》2009,(4):48-49

水,这是最近两周全世界关注的一个热词。3月16日到22日,第五届世界水资源论坛在土耳其伊斯坦布尔举行。参会人员达2．5万人,涵盖了13个国际机构和组织以及100多个国家和地区。论坛的主题是“架起沟通水资源问题的桥梁”。  相似文献   

国际摄影测量与遥感学会(ISPRS)第二十届大会情况     

杨凯 《测绘工程》2005,14(1):1-4

国际摄影测量与遥感学会(ISPRS)第20届大会于2004年7月12日至23日在土耳其伊斯坦布尔举行.  相似文献   

电阻率层析成像技术在滑坡调查中的应用——土耳其研究实例   总被引：1，自引：0，他引：1  

MahmutG．Drahor  任政委 《水文地质工程地质技术方法动态》2009,(4):16-24

电阻率层析成像是一种近地表地球物理勘查方法,它广泛应用于滑坡在内的各种地质、环境和工程等地质勘查。本次研究中,对土耳其艾登市瑟凯地区的一个滑坡场地进行了电阻率层析成像（ERT）勘查。2003年,由于开挖作业,导致一所新建学校附近斜坡上的上第三系地层变得不稳定,并在一场大雨之后出现了移动。随之而来的滑坡覆盖了这所学校的部分建筑物。作者采用温纳排列形式的二维电阻率方法,沿滑坡体布设三条剖面,得到了滑坡体的几何结构和特征等有用信息。另外,为了解电阻率法对滑坡的响应曲线,在野外调查之前,利用电阻率方法对滑坡进行了二维合成电阻率模拟研究。在滑坡场地还打了八个钻孔。钻孔和电阻率层析成像勘查两样成果都指出该场地内有一断层。沿着滑坡轴的测线上电阻率数据反映了该断裂面。  相似文献