Residual Currents Through the Dover Strait Measured by H.F. Radar

Residual (i.e. non-tidal) components of flow in the Dover Straits are determined from measurements recorded by the OSCR H.F. Radar system. The data are divided into 10 monthly sets, obtained from 5 months of dual radar deployments on the English side of the Straits and a corresponding 5 months from the French side. For each of these sets the tidal component was removed by subtracting constituents derived from separate (monthly) harmonic analyses.In each deployment, surface currents were measured at 700 locations at 20-min intervals, providing spatial resolution on a grid as fine as 660 m. This fine spatial resolution reveals distinct patterns of monthly-mean residual circulations never previously recognized. In particular, a residual gyre is shown to be a dominating feature along the French side, with currents exceeding 20 cm s^-1 and a diameter of 20 km. The previous obscurity of this feature may be attributable to the large (> 1·5 m s^-1) and strongly spatially variable tidal currents. In these conditions, tidal advection will rapidly smear any surface signature obtained from satellite observations. Likewise, fine resolution (grid spacings of an order of 1 km) is required to reproduce these gyre dynamics in numerical models.The time-varying residual currents were correlated with wind recordings. Significant correlations were obtained for an 'open-sea' response (as represented by Ekman theory), with the wind-driven surface current veering at angles of up to 45° to the right of the wind direction. This 'open-sea' response is modified close to the coast where the generation of surface gradients force the currents to align with the topography.Larger-scale residual motions were identified from modal analyses. The primary modes, on both sides, involved large-scale flows through the Straits partially correlated with local winds. However for winds aligned approximately north-south, the components of these flows on the English and French sides are in opposition. These modes also revealed large oscillatory motions with periods of between 20 and 40 h.Estimates of net residual flows through the Straits from the radar measurements confirm earlier calculations of the range of variability in this parameter. However the increasing complexity of the flow patterns revealed in this study emphasizes the difficulty in quantifying the long-term net flow.     

C18键合硅胶柱在线富集/FIA-FAAS系统测定海水中痕量重金属

基于8-羟基喹啉金属螯合物在C_(18)键合硅胶上的吸附原理,在海水样品中加入少量8-羟基喹啉溶液,建立在线C_(18)键合硅胶柱富集,甲醇洗脱,洗脱液直接进入火焰的流动注射-火焰原子吸收光谱系统(FIA-FAAS)测定海水中痕量Cu,Ni,Cd和Zn的方法。富集倍数达80,进样频率为每小时30次。对Cu Ni,Cd和Zn测定的特征浓度分别为0.30,0.26,0.12和0.07μg/L;检出限(2σ)分别为0.07,0.05,0.02和0.01μg/L;相对标准偏差分别为2.7,2.1,2.8和2.5％;回收率分别为102,98,96和102％。本法快速简便,污染少,灵敏度高。     

重金属胁迫对泥蚶(Tegillarca granosa)能量代谢酶转录水平的研究

利用PCR扩增技术,从泥蚶的cDNA文库中克隆出了ATP合酶F1-β亚基基因。FOF1-ATP合酶是生物体能量代谢的重要合成酶,ATP合酶F1-β亚基是其重要组成部分。序列分析结果表明,泥蚶的ATP合酶F1-β亚基全长1944bp,包括5′端非翻译区(5′-UTR)序列246bp,3′端非翻译区(3′-UTR)序列126bp和1572bp的开放阅读框序列(ORF),编码523个氨基酸,预测分子量大小和等电点分别为54.13kDa和4.73。在重金属镉、铜、铅胁迫下,检测ATP合酶F1-β亚基和精氨酸激酶基因在转录水平的调控变化。     

FN5井区夏子街组异常高阻段成因及油气成藏主控因素

通过岩心、薄片、构造演化史、古地貌等对FN5井区二叠系夏子街组异常高阻段进行综合分析.结果表明:FN5井区二叠系夏子街组异常高阻段发育2种岩性,高阻致密隔层以粗粒级云化凝灰质砂砾岩为主;低阻储层段以细粒级凝灰质细(中细)砂岩为主,储集空间具裂缝—孔隙双重介质特征.垂向上主要分布在夏子街组中部的P2x22砂层组;平面上主要分布在扇三角洲前缘近岸坡折带以下FC1—F20—FN055—FN5—W27井一带,面积为6.2km2,平面形态呈孤立的土豆状.油藏类型为东南方向受乌南断裂控制、其余方向受岩性控制的构造—岩性油藏.其展布受扇三角洲前缘的近岸水下坡折控制,后期成藏受控于异常高阻段的厚度及距主控断裂乌南断裂的距离.具有油层垂向厚度大、单井产量高、储量丰度高特征.为乌尔禾地区二叠系2011年探明储量培植及2012年增储上产的主要层位.     

文献记录的河西地区小冰期旱涝变化及其机制探讨

基于文献资料重建了河西地区AD 1436-1949旱涝灾害等级序列,结果表明所研究的500余年内河西地区大体出现三次明显的干旱时段,分别为AD 1460-1539、AD 1616-1665和AD 1907-1949,而AD 1725-1748以及AD 1879-1906则为相对湿润时期。重建的旱涝等级序列与毗邻祁连树轮记录的干湿变化存在高度一致的对应关系;将其与NAO指数对比发现,冷期NAO高指数年对应旱灾多发,NAO低指数年对应涝灾多发。     

在频率—波数域消除海上地震资料中的虚反射的一种方法

消除虚反射是海上地震勘探资料处理中的一个重要问题,本文提出一种在频率－波数域消除虚反射的方法,并给出了消除虚反射滤波因子的形式,然后利用此方法对合成地震记录进行了消除效果验证。     

应用地震层析成象技术研究深部速度结构

罗马尼亚Ｖａｎｃｅａ地震区是大陆上发生与板块磁撞和削减有关的中深部地震活动的地区之一。本文介绍了应用地震层析成象方法研究该地区深部速度结构成果。在研究中使用了地方和区域地震所记录的４３３个浅源和中部地震的到时资料反演求解深至２００ｋｍ的三维速度结构,在走时和射线路径的计算中利用了有效的三维射线跟踪技术,在反演中采用ＬＳＱＲ算法,高分辨率的地震层析图象揭示了速度结构的广泛不均匀性,结果表明,地震层析     

基于正交试验原理的锚喷参数设计系统及其应用

基于正交试验原理,把正交设计方法与地下工程有限元数值模拟有机地结合应用于锚喷支护参数的优化,形成基于正交试验原理的洞室锚喷参数设计系统的基本思路。并以此为基础编制了相应的程序,应用于地下工程锚喷支护设计。     

Trend,periodicity and abrupt change in streamflow of the East River,the Pearl River basin

The East River in the Pearl River basin, China, plays a vital role in the water supply for mega‐cities within and in the vicinity of the Pearl River Delta. Knowledge of statistical variability of streamflow is therefore important for water resources management in the basin. This study analyzed streamflow from four hydrological stations on the East River for a period of 1951–2009, using ensemble empirical mode decomposition (EEMD), continuous wavelet transform (CWT) technique, scanning t and F tests. Results indicated increasing/decreasing streamflow in the East River basin before/after the 1980s. After the early 1970s, the high/low flow components were decreasing/increasing. CWT‐based analysis demonstrates a significant impact of water reservoirs on the periodicity of streamflow. Scanning t and F test indicates that significantly abrupt changes in streamflow are largely influenced by both water reservoirs construction and precipitation changes. Thus, changes of streamflow, which are reflected by variations of trend, periodicity and abrupt change, are due to both water reservoir construction and precipitation changes. Further, the changes of volume of streamflow in the East River are in good agreement with precipitation changes. Copyright © 2012 John Wiley & Sons, Ltd.     

平顶山矿区岩溶水系统水-岩相互作用的随机水文地球化学模拟

在前期工作的基础上,基于新的（补充）采集的地下水化学样品的分析数据,以ＷＡＴＥＱ４Ｆ模型为基础,应用本次研究中开发的耦合的ＭｏｎｔｅＣａｒｌｏ－ＷＡＴＥＱ４Ｆ模型,对平顶山矿区地下水系统中水－岩反应状态进行了随机水文地球化学模拟和评价。结果表明：随机水文地球化学模拟方法具有很好的实用性和应用性和应用前景;在模拟研究区内地下水相对于方解石、、白云石、威武央过饱和,而与玉髓处于平衡状态。这些结果为该区