基于Delft3D模型的液体化工码头醋酸泄露风险数值模拟     

姜尚  吴耀建  罗阳  郭晓峰 《海洋湖沼通报》2013,(1):137-144

醋酸泄漏会使局部海水中的H+浓度增加,对邻近海域海水水质和海洋生物(浮游生物、鱼卵仔鱼、游泳动物)产生较大的影响。因此,对醋酸泄露在海水中的稀释扩散和影响范围进行预测十分必要。利用Delft3D数学模型对拟建液体化工码头醋酸溢漏2t时进行模拟,通过数值计算发现静风条件下醋酸溢漏6h后,其影响面积最大,超二类海水水质标准面积约为1.48km2。随着海水的稀释扩散,影响面积和程度逐渐减小,约24h后,不会出现超三类海水水质标准的区域。溢漏事故发生后,应立即根据事故情况采取防护对策极力防止溢出物靠近环境保护目标,从而防止或减小对环境保护目标的影响。  相似文献   

陕西山阳庙梁金矿地质特征及流体包裹体研究     

陈永康  梁婷  周义  丁亮  李聪  李尚  岑炬标  张三龙 《岩石矿物学杂志》2022,41(1):95-111

庙梁金矿床位于南秦岭柞水-山阳矿集区的中心地带,为了查明庙梁金矿成矿流体特征、金的沉淀机制及矿床成因,对该矿床不同成矿阶段脉石矿物中的流体包裹体进行了详细的岩相学、显微测温、激光拉曼光谱分析研究并与周边典型金矿床特征进行了对比.结果 表明,该矿床包裹体类型丰富,成矿早阶段主要为H2O-NaCl型包裹体(Ⅱ型)、部分H2...  相似文献   

基于OpenMP的并行图像相减算法实现与分析   总被引：1，自引：0，他引：1  

李继良  于策  孙济洲  商朝晖  陈锦言  曹玮  张旭明 《天文研究与技术》2011,8(2):146-152

图像相减是一种精确地获得密集星体区域中变星的相对光度变化的技术,其基本原理为通过同一区域不同时间的图像间差异来获得该区域的时间变化信息.传统上图像相减变源测光算法只有串行性算法,计算效率不高.讨论了图像相减测光算法的基本原理,在开源软件ISIS基础上提出了一个基于OpenMP技术的图像相减算法的可靠并行化实现,提高了程...  相似文献   

Age constraints on faulting and fault reactivation: a multi-chronological approach   总被引：2，自引：0，他引：2  

Wolfgang Siebel  Horst P. Hann  Martin Danišík  Cosmas K. Shang  Christoph Berthold  Johann Rohrmüller  Klaus Wemmer  Noreen J. Evans 《International Journal of Earth Sciences》2010,99(6):1187-1197

Movement within the Earth’s upper crust is commonly accommodated by faults or shear zones, ranging in scale from micro-displacements to regional tectonic lineaments. Since faults are active on different time scales and can be repeatedly reactivated, their displacement chronology is difficult to reconstruct. This study represents a multi-geochronological approach to unravel the evolution of an intracontinental fault zone locality along the Danube Fault, central Europe. At the investigated fault locality, ancient motion has produced a cataclastic deformation zone in which the cataclastic material was subjected to hydrothermal alteration and K-feldspar was almost completely replaced by illite and other phyllosilicates. Five different geochronological techniques (zircon Pb-evaporation, K–Ar and Rb–Sr illite, apatite fission track and fluorite (U-Th)/He) have been applied to explore the temporal fault activity. The upper time limit for initiation of faulting is constrained by the crystallization age of the primary rock type (known as “Kristallgranit”) at 325 ± 7 Ma, whereas the K–Ar and Rb–Sr ages of two illite fractions <2 μm (266–255 Ma) are interpreted to date fluid infiltration events during the final stage of the cataclastic deformation period. During this time, the “Kristallgranit” was already at or near the Earth’s surface as indicated by the sedimentary record and thermal modelling results of apatite fission track data. (U–Th)/He thermochronology of two single fluorite grains from a fluorite–quartz vein within the fault zone yield Cretaceous ages that clearly postdate their Late-Variscan mineralization age. We propose that later reactivation of the fault caused loss of helium in the fluorites. This assertion is supported by geological evidence, i.e. offsets of Jurassic and Cretaceous sediments along the fault and apatite fission track thermal modelling results are consistent with the prevalence of elevated temperatures (50–80°C) in the fault zone during the Cretaceous.  相似文献   

广东华侨文化景观及其地域分异   总被引：6，自引：0，他引：6  

许桂灵  司徒尚纪 《地理研究》2004,23(3):411-421

华侨文化地理研究 ,在国内外是一个薄弱领域。本文以我国华侨人数最多、分布最广的广东为对象 ,阐述华侨文化的内涵 ,侨乡在引种外来作物形成的土地利用景观 ;引进西方骑楼和城镇规划制度 ,并结合当地环境产生的建筑文化景观 ;外语与方言相结合并广泛办侨刊形成的语言文字景观 ,以及华侨形成的人才文化景观等特色和影响。根据侨乡文化特质的相对一致性和侨居地文化背景相对共同性相结合的原则 ,首次划分珠江三角洲广府、五邑、潮汕、东江 -兴梅、琼东北 5个华侨文化区 ,并指出它们各自的文化特点和区域效应等  相似文献   

太湖流域浙西区不同农业土地类型的面源污染产出     

李恒鹏  刘晓玫  黄文钰 《地理学报(英文版)》2004,14(2):151-158

This paper takes Zhexi hydraulic region in Taihu Basin as a study area. On the basis of hydraulic analysis function of Arcgis8.3, the drainages were delineated by selecting the monitoring points and discharge stations as outlets. The landuse map were finished by denoting the TM/ETM image. The precipitation map was finished by spatial interpolation according to the rainfall monitoring records. Overlaying the drainage boundary, landuse map and precipitation map, the rainfall, different landuse type area, and runoff pollution concentration and runoff were calculated. Based on these data in different sub-watersheds, by Origin7.0 regression tool, an equation is established to predict runoff using the relationships between runoff, precipitation depth and land use patterns in each of the sub-watersheds. Selecting the sub-watershed which is mainly composed of forest landuse type, the mean runoff concentration (MRC) from sub-watershed has been estimated. The mean runoff concentration of farmland has been estimated by the same methods after the contribution of forestlanduse type was removed. The results are“ for the forest landuse type, the mean runoff concentrationsof COD, BOD, Total N and Total P are 2.95 mg/l, 1.080 mg/l, 0.715 mg/l, and 0.039 mg/l,respectively; for the farmland, the mean runoff concentrations of COD, BOD, Total N and Total P are 5.721 rag/l, 3.097 rag/l, 2.092 rag/l, and 0.166 rag/l, respectively. By using these results, the agriculture non-point pollution loads have been assessed. The loads of COD, BOD, Total N and Total P in Zhexi region are 14,631.69 t/a, 6401.93 t/a, 4281.753 t/a and 287.67 t/a, respectively.  相似文献   

一种气温的数值预报权重误差订正释用方法     

吴哲红  彭波  符凤平  周文钰  吴昊若 《贵州气象》2016,(4):11-15

该文在对几种数值预报产品的气温要素预报结果进行检验的基础上,尝试建立了一种权重误差订正方法:通过对数值预报产品进行检验订正,首先根据EC粗网格预报结果结合典型天气形势判断气温走势建立方程,对不同预报产品以近期准确率作为权重平均并结合误差加以订正,建立订正预报方程,对历史个例的检验和试报说明此方法对于提高气温预报的准确率,减小误差是有效的。  相似文献   

Sulfur and Carbon Co‐doped TiO2 Composite Fabricated by Lignosulphonate and Its Suitability for Removal of Cadmium     

Xiao‐Hang Zou  Xu‐Ting Shang  Rui‐Jia Wang  Ji‐Guo Zhang  Qing‐Jiang Pan  Yuan‐Ru Guo 《洁净——土壤、空气、水》2019,47(9)

Highly toxic divalent cadmium causes serious environmental issues. To quickly monitor and/or efficiently remove this potentially toxic metal ion as well as to explore its interfacial chemistry with metal oxides, a sulfur and carbon co‐doped titania (S/C‐TiO₂) composite is synthesized via a facile sol‐gel method with the assistance of sodium lignosulphonate (SLS). The prepared composite displays a well‐crystallized TiO₂ nanostructure comprising the anatase phase. Both S and C, which are derived from the SLS template, are found to enter the TiO₂ lattice. The S/C‐TiO₂ composite exhibits a porous structure with a wide pore size distribution. The newly synthesized composite shows adsorption capability for the potentially toxic metal Cd(II). The adsorption process requires <5 min to reach equilibrium. The measured equilibrium adsorption capacity is 19.42 mg g^?1, which is twice as high as that of bare TiO₂. The removal efficiency is as high as 97%. Moreover, the materials are suitable for contaminated solutions over a wide range of pH values and various initial cadmium concentrations. A mechanism for the enhanced adsorption behavior is also proposed.  相似文献   

黄河三角洲治理规划研究综述   总被引：1，自引：0，他引：1  

李景宗洪尚池  何宏谋曹俊峰 《海岸工程》2000,19(4):79-85

近年来随着黄河三角洲社会经济的发展,迫切要求对黄河三角洲实施大规模开发。随着黄河上中游社会经济的发展,黄河进入河口地区的水沙情况也发生了较大的变化。针对黄河三角洲地区出现的新情况、新问题,对近年来黄河三角洲地区防洪、防潮、水资源利用、滩涂资源开发等方面的规划研究进行了综述,并建议了今后的主要研究方向。  相似文献   

滇西南那邦变质基性岩两期变质作用的40Ar/39Ar年代学研究   总被引：7，自引：5，他引：2  

季建清  钟大赉  桑海清  裘冀  胡世玲 《岩石学报》2000,16(2)

中缅边界那邦变质基性岩出露于东缅著名的 Mogok带的东缘。那邦基性麻粒岩经历了早期麻粒岩相、晚期角闪岩相的两期变质作用的改造。早期变质作用的矿物石榴石和单斜辉石的 40 Ar/ 39Ar激光微区等时线年龄是 74.44± 1.44 Ma;石榴石和单斜辉石的 40 Ar/ 39Ar年龄谱图和等时线年龄均显示两组年龄 :74～ 76 Ma和 2 3～ 2 4Ma。晚期变质作用矿物角闪石的K- Ar法得出 2 3Ma,角闪石和斜长石的 40 Ar/ 39Ar年龄谱图和等时线年龄均显示 2 3～ 2 4Ma的变质年龄。综合这些结果 ,可以确定那邦基性麻粒岩的早期麻粒岩相变质作用的年龄是 74～ 77Ma,可能与新特提斯洋壳俯冲事件有关 ;晚期角闪岩相变质作用的年龄是 2 3～ 2 4Ma,与区内喜山期以来陆内块体响应两大陆会聚作用发生的大型走滑事件有关。那邦基性麻粒岩是世界上最年轻的麻粒岩相岩石之一 ,而且 ,两期变质作用年龄的确定对揭示区内与变质作用相关的地质事件具有重要意义。  相似文献