赤泥库大坝渗漏分析及灌浆处理技术          下载免费PDF全文

黄全海  赵尊亭  王利芳 《探矿工程》2015,42(11):66-69，79

由于施工质量问题,洛阳一个赤泥库大坝在试运行中发生大面积渗漏及管涌。在对渗漏原因进行分析的基础上实施的在坝内坡增设土工膜、坝轴线上游增设帷幕灌浆防渗墙、坝体下游坡面增设排渗沟和排水棱体等抢险加固措施,有效地解决了坝体渗漏问题。在灌浆处理过程中,针对筑坝材料的复杂性和不均匀性,通过施工前的灌浆试验,取得了适合本场地条件的钻孔施工工艺参数及灌浆方式、灌浆压力、灌浆段确定、水灰比比级等施工技术参数,确保了灌浆处理的效果。  相似文献   

基于红绿色觉异常人群的路况地图色彩设计研究     

朱海红  夏梦 《测绘工程》2015,(12):1-6

红绿色觉异常人群对于明度变化的感受比正常视觉者更加敏感,可以弥补色相辨别的缺陷。通过针对黄色明度对比实验得出红绿色觉异常人群对明度对比各等级的视觉感受,找出对红绿色觉异常人群既可以容易识别又不会觉得刺眼的明度对比范围。实验结果引入地图设色,结合色彩象征意义,做出红绿色觉异常人群和正常人群通用的路况地图。在路况信息清晰表达前提下,尽可能保留色彩象征意义,并保证地图的观赏性。通过路况地图色彩明度对比实验制作出红绿色觉异常人群既能无障碍识别又带有警示象征意义的路况地图。  相似文献   

DNA barcode assessment of Ceramiales (Rhodophyta) in the intertidal zone of the northwestern Yellow Sea   总被引：1，自引：0，他引：1  

杜国英  吴菲菲  郭皓  薛红凡  茅云翔 《中国海洋湖沼学报》2015,33(3):685-695

A total of 142 specimens of Ceramiales(Rhodophyta) were collected each month from October 2011 to November 2012 in the intertidal zone of the northwestern Yellow Sea. These specimens covered 21 species,14 genera,and four families. Cluster analyses show that the specimens had a high diversity for the three DNA markers,namely,partial large subunit r RNA gene(LSU),universal plastid amplicon(UPA),and partial mitochondrial cytochrome c oxidase subunit I gene(COI). No intraspecific divergence was found in our collection for these markers,except for a 1–3 bp divergence in the COI of Ceramium kondoi,Symphyocladia latiuscula,and Neosiphonia japonica. Because short DNA markers were used,the phylogenetic relationships of higher taxonomic levels were hard to evaluate with poor branch support. More than half species of our collection failed to find their matched sequences owing to shortage information of DNA barcodes for macroalgae in Gen Bank or BOLD(Barcode of Life Data) Systems. Three specimens were presumed as H eterosiphonia crispella by cluster analyses on DNA barcodes assisted by morphological identification,which was the first record in the investigated area,implying that it might be a cryptic or invasive species in the coastal area of northwestern Yellow Sea. In the neighbor-joining trees of all three DNA markers,H eterosiphonia japonica converged with D asya spp. and was distant from the other Heterosiphonia spp.,implying that H. japonica had affinities to the genus Dasya. The LSU and UPA markers amplified and sequenced easier than the COI marker across the Ceramiales species,but the COI had a higher ability to discriminate between species.  相似文献   

曹县梁堤头地区第四系地裂缝成因及防治          下载免费PDF全文

冯超臣  黄文峰  郑秀荣 《山东国土资源》2015,31(5)

鲁豫交界的曹县黄河故道地区,地势较高的自然堤堤缘区是地裂缝等地质灾害的高发区。地裂缝主要由地表厚粘土层干湿胀缩产生,有一定的隐蔽性,并受地形和大气影响。地下水动态变化对地裂缝影响不大。地表裂隙张力的直接作用、建筑物的非均质土地基不均匀沉陷等因素的存在共同导致了该区民房开裂。可以采取加固地基和搬迁避让等方法进行防治。  相似文献   

楚科奇海盆M04柱晚更新世以来沉积古环境记录   总被引：1，自引：0，他引：1  

章伟艳  于晓果  刘焱光  金路  叶黎明  许冬  边叶萍  张德玉  姚旭莹  张富元 《海洋学报》2015,37(7):85-96

对"中国第五次北极科考"采自楚科奇海盆的M04柱进行粒度、冰筏碎屑、黏土矿物、岩心XRF扫描、沉积物颜色分析,初步建立了楚科奇海盆晚更新世MIS4期以来的沉积地层框架。MIS4期以来,楚科奇海盆M04柱沉积物粒度和黏土矿物组成具有明显的冰期/间冰期变化特征,冰期沉积物粒度分布以双峰态为主,由洋流搬运和海冰搬运沉积组分组成,伊利石含量高、高岭石含量低;间冰期沉积物具有三峰态粒度分布特征,由海冰搬运、洋流搬运和冰山搬运沉积组分组成,伊利石含量低、高岭石含量高。通过M04柱黏土矿物组合类型与北冰洋边缘海盆的表层沉积物黏土矿物组合类型对比表明,晚更新世以来楚科奇海盆沉积环境发生显著变化:温暖的间冰期受波弗特涡流驱动,波弗特海为研究区的物源输入提供了主要贡献;寒冷的冰期表层环流呈反向输运,细颗粒物源碎屑以东西伯利亚海的输入为主。  相似文献   

粤西沿海一次赤潮事件的三维观测     

谢玲玲  陈清香  胡建宇  张书文  伊小飞  陈法锦  邓锐  邓晓东  王静  齐义泉 《海洋学报(英文版)》2015,34(1):159-161

From November 24 to 26, 2014, a red tide event occurred in the offshore water off the Hailing Island located at the western Guangdong coast. The red tide appeared as pink strips distributed within 3 km in the offshore water and extended for about 10 km along the shoreline. During the flood tide, the pink seawater rushed to the beach with breaking waves, forming foam strips on the beach. Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction Technologies, Guangdong Ocean University, emergently responded to the event and organized three-dimensional observations from the air, onboard and on beach. The preliminary analyses of the cruise data and water samples indicate that the event was induced by nontoxic Noctiluca scintillans, of which the concentration reaches as high as 4 200 cells/L near the surface and 2 600 cells/L at the bottom.  相似文献   

Dissolved organic matter and its role in red tide succession in the East China Sea in spring     

������  ����� 《中国海洋湖沼学报》2011,29(4):795-799

Dissolved fluorescent organic matter was measured using fluorescence excitation-emission matrix spectroscopy at three temporal points during a Synechococcus bloom after diatom bloom dispersion in spring, 2007. Carbohydrate and dissolved organic carbon were also analyzed. The relationship between organic matter and red tide succession was examined. The results show that after the diatom bloom, tyrosine-like fluorescence B intensity was very high within the water column and exhibited a negative correlation wi...  相似文献   

湖泊沉积物的矿物组成、成因、环境指示及研究进展   总被引：5，自引：1，他引：4  

金章东 《地球科学与环境学报》2011,33(1):34-44,77

湖泊沉积物是不同地质、气候、水文条件下各类碎屑、黏土、自生/生物成因矿物以及有机物质等的综合体。沉积矿物蕴含着丰富区域和全球环境演变信息,如湖水的化学组成、流域构造、气候、水文以及人类活动的相互作用等。相关信息可以赋存在矿物外部微形貌、内部微结构、化学组成、物理和化学性质、同位素组成、谱学特征、成因以及共生组合等方面。因此,湖泊科学的许多关键课题都离不开矿物学,特别是在利用湖泊沉积物进行区域及过去全球变化研究中,深入的机理研究归根到底都要涉及矿物学,如流域化学风化作用、粒度组成、生物壳体化学组成、测年材料的选择等。然而,由于湖泊沉积物中矿物的多源性、复杂性,如何有效提取和解译其中的环境信息,是一项长期困扰研究者的课题,湖泊沉积矿物学的研究往往被许多研究者所忽视,中国的相关研究也较为薄弱。笔者综述了湖泊沉积物中碎屑、黏土、自生/生物矿物的矿物组合、特征、成因在(古)环境反演中的作用及最新研究进展,提出除了继续加强对湖泊沉积物中矿物来源、成因和古环境示踪的深入研究以外,矿物相间的转变及其对湖水和孔隙水组成的响应、一些非晶质或隐晶质及低丰度矿物相在湖泊化学和动力学中的作用也是很有潜力的研究领域,最后提出了研究中存在的一些问题、面对的挑战以及对研究前景的展望。  相似文献   

原子吸收分光光度法快速测定红土镍矿中镍   总被引：1，自引：0，他引：1       下载免费PDF全文

司银奎  申世伟 《山东国土资源》2011,27(10):47-48,51

试样经烘干处理后,利用酸溶法或碱融法制备稳定的分析溶液,然后利用原子吸收分光光度计于波长232.0nm处,随同标准曲线测量镍含量,此方法简单、快捷,所选分析线干扰小、灵敏度高,稳定性和准确度均满足要求。  相似文献   

基于红边位置的台湾相思树叶片叶绿素含量估测模型研究     

张清林  陈文惠  张永贺  郭啸川  褚武道  许炜敏 《福建地理》2011,(3):9-17

在BRDF测试系统环境下利用ASD便携式野外光谱仪采集台湾相思树叶片光谱,并用UV2450-分光光度计对观测叶片进行叶绿素含量测定．对光谱数据采用不同算法获得红边位置变量,并与叶绿素含量进行拟合,构建用于估测台湾相思树叶片叶绿素含量的模型．结果表明,各种算法获得的红边位置变量用于构建模型估测叶绿素含量是可行的,其中,采用5次多项武拟合算法精度最高．经平滑处理后的一阶导数法精度坎之．  相似文献