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Determination of wave–shoreline dynamics on a macrotidal gravel beach using Canonical Correlation Analysis

This paper describes the application of Canonical Correlation Analysis (CCA) to derive forcing–response relations between the wave climate and shoreline position on a macrotidal gravel barrier located in the southwest of the U.K., and to develop a tool to determine shoreline positions from wave records. The data sequences comprise wave climate recorded by a nearshore directional wave buoy and video-derived shorelines over a time span of one year and a half. The hydrodynamic conditions are used to determine the probability density function of wave heights and alongshore energy fluxes. These are then related to shoreline change through a CCA analysis. The CCA analysis identifies patterns of behaviour of the wave conditions and the shoreline position, and the relation between both patterns is found to provide useful information about the beach response to wave action. The analysis shows that the movement of sediment is greater at the southern end of the study area and that there is an immediate shoreline response to the wave action. In the case of coastal management it is more often the case that wave forecasts are available on a routine basis. The ability of the CCA to provide useful estimates of shorelines from wave conditions was tested by using measured waves to calculate the corresponding shoreline position from additional data at the end of the sequences. Shoreline positions determined with the CCA agreed well with the measured ones. Thus, the CCA is found to be a useful tool to determine unknown shoreline positions and support effective coastal management if good quality hydrodynamic and morphological data are available to input into the initial set-up of the technique.     

分析室内二维砂槽弥散试验数据的方法

将描述半无限域上的一维稳定渗流二维水动力弥散条件下的溶质浓度在空间上变化规律的近似解析解进行适当变换 ,推导出可用于分析相应条件下的室内砂槽弥散试验数据 ,同时估计多孔介质纵向与横向弥散度aL 和aT 的计算公式。最后 ,利用算例说明了数据分析方法的应用步骤。     

山西组煤层风氧化带深度的确定——以滕县煤田五号井田为例

以滕县煤田五号井田为例 ,在综合分析风化剥蚀面性质和钻孔岩心鉴定资料、煤质化验指标、视电阻率的基础上 ,确定了山西组 3煤层风氧化带的深度 ,对其影响因素进行了探讨 ,并与邻区作了对比。     

The Application of Quantitative Fluorescence Techniques in China

The introduction of multi-methods of Geo-logging at wellsite has become the major measurement of oil & gas exploration. From the early stage of manually geo-logging to the modern mudlogging with new techonlogies of MWD, LWD and QFT etc. The new technologies have played very important roles in the exploring of oil & gas. Being one of the newest technology of mudlogging, QFT has been widely used in oilfield for about 3 years. When it is put in operation in some oilfields of China in 1997, its advantages in oil & gas detection at wellsite have been continuously recognized, especially in the detection of shows of light oil and condensed oil.Aset of powerful classification standard of resource rock oil bearing grades and the interpretation standards have been summarized by the application of the quantitative fluorescencelogging techniques (QFT) in Basins of China, together with gas-logging data, and other information got from the Geo-logging procedures at wellsite.     

一种基于路由路径分析的周边网络区域发现算法

为了克服传统基于网络拓扑的网络区域发现算法在实现上的障碍,提出了一种不依赖于网络拓扑的周边区域发现算法。该算法仅依靠主机之间的路径信息,通过对各路径上对应节点的距离关系的分析来发现距离某个区域一定跳数的周边的网络区域。理论分析及测试实验证明,该算法对信息完整性和实时性依赖很低,具有构造简便和查询迅速的特点。     

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膨胀式自应力灌浆卡箍灌浆本构关系模型的研究

膨胀式自应力灌浆卡箍是一种典型的钢/灌浆组合结构,由于膨胀受限灌浆处于三向受压状态,在这种结构的强度校核中采用合适的灌浆本构模型是影响设计结果的重要因素。采用ABAQUS建模这种卡箍,构筑了三种灌浆本构关系模型,主要测试了莫尔库仑模型和塑性损伤模型的相关材料参数,然后通过一个节点灌浆卡箍的设计算例,比较和分析了三种灌浆本构模型的计算结果。仿真分析发现对于卡箍的灌浆强度校核,线弹性模型最保守,容易校核不合格,而塑性损伤模型最不保守。建议采用能反映灌浆的压碎和开裂行为的塑性损伤模型作为膨胀式灌浆卡箍强度校核分析的本构关系。研究结果可以为自应力灌浆卡箍的有限元强度校核方法提供有益的借鉴和指导。