Using a simple morphometric marker to identify spatial units for abalone fishery management     

Saunders  T.; Mayfield  S.; Hogg  A. 《ICES Journal of Marine Science》2009,66(2):305-314

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巴基斯坦N区块浪控三角洲沉积相划分及模式     

陈旭  欧荣生  斯尚华  董玉文  柯钦 《沉积学报》2022,40(1):255-266

浪控三角洲砂体是海陆交互带沉积有利的油气储层和勘探目标,目前业界对其微相划分、沉积机理和沉积模式研究较少.以巴基斯坦N区块为例,依据岩心、测井、地震及分析测试资料,开展受波浪改造作用的海相三角洲沉积相带划分、展布及沉积模式研究.结果表明:综合大量沉积相标志分析,研究区白垩系处于砂质高能海岸带,三角洲入海口受到强烈的波浪...  相似文献   

Anthropogenic marker evidence for accelerated sedimentation in Lake Illawarra,New South Wales,Australia   总被引：1，自引：0，他引：1  

B. E. Chenhall  I. Yassini  A. M. Depers  G. Caitcheon  B. G. Jones  G. E. Batley  G. S. Ohmsen 《Environmental Geology》1995,26(2):124-135

The chronology of near-surface sediments in Lake Illawarra has been investigated using radiocarbon dating and anthropogenically derived substances including trace metals, ash, and¹³⁷Cs. Sediments at depths about 1 m below the water-sediment interface ranged in age from Modern to 786 calendar years bp on the basis of radiocarbon dating ofNotospisula trigonella valves. Multiple marker (for example ash-trace metals) depth-concentration sediment profiles yielded estimates of sedimentation rate ranging from 3 to 5 mm yr^–1 at Griffins Bay to more than 16 mm yr^–1 at Macquarie Rivulet. Sedimentation rates of approximately 10 mm yr^–1 appeared to be typical of the western and southwestern portions of the lagoon. Rates of sediment accretion, prior to catchment clearing, urbanization, and industrialization have been estimated at less than 1 mm yr^–1, thus indicating a general tenfold increase in sediment accumulation adjacent to the western foreshore caused by catchment development. Accelerated sedimentation in shallow coastal lagoons constitutes significant environmental impacts including shoaling, degradation of seagrass beds, and increased turbidity with consequent loss of aesthetic appeal. Management policy should be directed at attempts to reduce the amount of sediment input by the construction of strategically placed sediment retention ponds. Siltation within the shallow embayments of Lake Illawarra could be ameliorated by a carefully planned program of dredging.  相似文献   

基于MySQL的测量标志点可视化管理与导航寻点系统     

黄李雄  陈颖  夏宋鹏程 《测绘地理信息》2020,(2):60-63

设计开发了基于MySQL的测量标志点可视化管理及导航寻点系统,给出了系统总体构架和服务端与移动端的数据交互方式,阐述了系统中测量标志点可视化和信息化管理、移动端导航寻点和信息采集、导航轨迹测量与简化、多控制点的导航寻找等关键问题的解决方案。系统运行表明,服务端地图显示测量标志点和查询结果,界面直观、友好,实现了测量标志点可视化信息化管理;移动端的导航寻点功能可以提高外业作业效率。  相似文献   

Alkylbenzenes in mussels from South and South East Asian coasts as a molecular tool to assess sewage impact     

Tsutsumi S  Yamaguchi Y  Nishida I  Akiyama K  Zakaria MP  Takada H 《Marine pollution bulletin》2002,45(1-12):325-331

Alkylbenzenes, molecular markers of sewage, were measured in 34 green mussels collected from India, Indonesia, Malaysia, Thailand, Cambodia, Vietnam, and the Philippines together with blue mussels collected from Tokyo Bay, Japan. Linear alkylbenzene (LAB) concentrations in South and South East Asian countries ranged from 10 to 1640 ng-∑LAB/g-dry tissue. In some populous cities, LAB concentrations were similar or higher than those found in northern Tokyo Bay which is heavily impacted by sewage effluents. I/E ratios (a ratio of internal to external isomers of LABs) in the South and South East Asian countries (1–3) were much lower than those in Tokyo Bay (3–8), indicating sewage discharged in the coastal zone is poorly treated (e.g., raw sewage and/or primary effluents). Alkylbenzenes with branched alkyl chains, tetrapropylene-based alkylbenzenes, were also detected in mussels from Indonesia and Philippines. This “tell-tale” sign indicates that poorly degradable detergents are still in use in this area, although they have long been phased-out in many industrialized countries.  相似文献   

Biogeochemical aromatic markers in the sediments from mahakam delta (Indonesia)     

P. Garrigues  A. Saptorahardjo  C. Gonzalez  P. Wehrung  P. Albrecht  A. Saliot  M. Ewald 《Organic Geochemistry》1986,10(4-6)

Analysis of the tri-, tetraand pentaaromatic hydrocarbon fractions of several sediments (0–600 m) from the Mahakam Delta (Indonesia), indicate the predominance of polycyclic aromatic hydrocarbons (PAH) diagenetically related to triterpenoid natural precursors. High resolution Shpol'skii spectrofluorometry (HRS) proved to be a valuable analytical tool, in conjunction with high performance liquid chromatography (HPLC) and capillary gas chromatography coupled with mass spectrometry (CGC/MS), for the identification of individual components in Chromatographic fractions obtained after a high resolution reverse phase liquid chromatography.  相似文献   

辽河盆地西部凹陷下第三系原油和生油岩的生物标记化合物研究   总被引：4，自引：0，他引：4  

卢松年  李伟民  郜建军  陈义贤  宋少英 《地球科学》1986,(3)

本文应用色谱-质谱和气相色谱等技术分析鉴定了辽河断陷盆地西部凹陷下第三系原油和生油岩饱和烃中的甾、萜烷等生物标记化合物。并利用甾、萜烷等生物标记化合物和其它地质、地球化学资料,讨论了油、岩的生物先体性质,将其做了分类对比,确定了沙河街组、东营组和前中生界潜山原油的原生性和次生性。  相似文献   

基于数学形态学的IKONOS多光谱图像分割方法研究   总被引：2，自引：0，他引：2  

徐春燕  冯学智  赵书河  肖鹏峰 《遥感学报》2008,12(6)

利用数学形态学方法,研究与探讨了IKONOS多光谱图像的分割技术.提出一种结合图像边缘特征和纹理特征的混合分割新算法.在高分辨率多光谱遥感图像K-L变换的基础上,采用多尺度多方向形态学梯度算子提取边缘特征.应用数学形态学滤波及局部方差统计特征对图像对象进行标记,最后采用强制最小过程,进行标记控制的分水岭分割.研究结果表明,提出的分割算法优于仅利用边缘特征的分水岭分割算法,同时,该算法能较好地解决分割过程中存在的过分割与欠分割问题,是一种适合高分辨率多光谱遥感图像的分割算法.  相似文献   

滇西南昌宁—孟连带三叠纪牡音河组硅质岩地球化学特征及沉积环境   总被引：2，自引：0，他引：2  

张振芳  冯庆来  方念乔  黄军义  李世雄  陈学方 《地球科学》2001,26(5):449-455

滇西南昌宁—孟连带牡音河组硅质岩已进行了较好的生物地层学和沉积学研究, 表明为中三叠世深水盆地沉积, 但对其沉积构造背景存在不同的认识. 本文尝试用分子有机地球化学方法, 并辅以无机地球化学的手段, 研究牡音河组硅质岩的物源环境, 分析沉积区构造背景. 研究结果表明硅质岩中正构烷烃碳数分布范围较宽C₁₄—C₃₆, 且具双峰型分布模式, 说明其有机质为陆生高等植物和水生生物混合来源; 萜类和甾类化合物特征说明研究区有机质来源总体上以水生生物为主, 同时有不同程度陆生高等植物混入. 牡音河组硅质岩Σw (REE) 为83.56 × 10-6 124.1 × 10-6, w (Ce)/w (Ce) 在0.760.99之间变化, w (La)_n/w (Yb)_n在0.771.98之间, 说明该盆地明显受陆源区物质影响. 另外, 该硅质岩的w (La)_n/w (Ce)_n和w (Al₂O₃)/w (Al₂O₃+Fe₂O₃) 图解及w (MnO)/w (TiO₂) 比值也说明牡音河组硅质岩沉积过程中受到大陆作用. 两方面的特征互相印证, 说明研究区中三叠世为受陆地强烈作用的深水局限盆地. 这项研究还说明, 分子有机地球化学方法能够为硅质岩沉积环境的探讨提供更多的物源和环境信息.   相似文献   

Development of a SCAR marker for male gametophyte of Gracilariopsis lemaneiformis based on AFLP technique   总被引：1，自引：0，他引：1  

周伟  丁弘叶  隋正红  王钟霞  王津果 《中国海洋湖沼学报》2014,32(3):522-526

The red alga Gracilariopsis lemaneiformis （Bory） is an economically valuable macroalgae. As a means to identify the sex of immature Gracilariopsis lemaneiformis, the amplified fragment length polymorphism （AFLP） technique was used to search for possible sex- or phase-related markers in male gametophytes, female gametophytes, and tetrasporophytes, respectively. Seven AFLP selective amplification primers were used in this study. The primer combination E-TG/M-CCA detected a specific band linked to male gametophytes. The DNA fragment was recovered and a 402-bp fragment was sequenced. However, no DNA sequence match was found in public databases. Sequence characterized amplified region （SCAR） primers were designed from the sequence to test the repeatability of the relationship to the sex, using 69 male gametophytes, 139 female gametophytes, and 47 tetrasporophytes. The test results demonstrate a good linkage and repeatability of the SCAR marker to sex. The SCAR primers developed in this study could reduce the time required for sex identification of Gracilariopsis lemaneiformis by four to six months. This can reduce both the time investment and number of specimens required in breeding experiments.  相似文献