吴哥神庙平面规划特征     

陆泓  徐旌  陆恺 《云南地理环境研究》2011,23(1):105-110

通过实地考察和资料分析,研究得出吴哥神庙平面规划特征为:以东、西向中轴线为主,左右对称,四周闭合;与华夏传统坛庙建筑平面布局特征取向一致,其主要原因为:在吴哥时期封建奴隶制社会突出帝王的权力;华夏传统建筑文化平面布局对吴哥神庙建筑文化的渗透影响。吴哥神庙建筑群由若干建筑语言组合而成,其模式承传了600多年,由简约演化为繁复。  相似文献   

长江口拦门沙河段潮滩表层沉积物分布特征(英文)   总被引：2，自引：0，他引：2  

闫虹  戴志军  李九发  赵建春  张小玲  赵军凯 《地理学报(英文版)》2011,21(4):719-732

Sediment samples with high spatial resolution (432 samples in total) and flow data were collected on the tidal flats in the mouth-bar region of the Yangtze Estuary. The data was collected in July 2005, July 2006 and May 2007. The samples were analyzed with a particle sizer, resulting in the sediment distribution. The grain sizes and related parameters were analyzed. The results were presented in a ternary diagram. The sediment mainly consisted of sand, silty sand, sandy silt, sand-silt-clay, silt and clayey silt. And sand skeletons and clay matrices were found. At Nanhui Shoal, silt skeletons could be identified as well. Furthermore, the results were discussed per shoal. Although some depth dependencies were found per shoal, no general relation was found. The results are as follows: sediment located at these tidal flats of the Yangtze Estuary was mainly composed of sand, silty sand and silt. The median grain size in sediment was relatively complex with a range from 2.5 φ to 8 φ. The distributions of sorting coefficients ranging from 1 to 2 were in agreement with median sizes. It was suggested that sediment of the tidal flats was coarser and better sorted or finer and worse sorted. The skewness in sediment distribution varied from 0.1 to 0.8. In addition, the distributions of sorting coefficient and skewness in sediment at Chongming Eastern Shoal, Hengsha Eastern Shoal and Jiuduan Shoal were of similar characteristics because there were closely positive correlated relationships among these parameters. However, due to the location difference between Nanhui Southern Shoal and Eastern Shoal, the values of sorting coefficient and skewness had relatively large distinctions. The tracks of sediment transport could be described based on the distributions of sediment, which might reveal sediment transport controlled by two dominant hydrodynamic factors of current and wave. It was appreciable that coarser sediment with lower sorted coefficient was affected by dominant ebb current action and intense wave action resulted from rapidly dissipated wave energy. Moreover, due to the effects of obstructed branches, guided current and broken wave actions of the Deep Water Channel Project, grain-size in sediment located at two sides of the groyne was of uneven distribution characteristics.  相似文献   

Distributions of sediments of the tidal fiats in response to dynamic actions, Yangtze (Changjiang)Estuary     

YAN Hong  DAI Zhijun  LI Jiufa  ZHAO Jianchun  ZHANG Xiaoling  ZHAO Junkai 《地理学报(英文版)》2011,21(4)

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潮汐地电场谐波和各向波形的影响要素   总被引：11，自引：2，他引：9       下载免费PDF全文

谭大诚  王兰炜  赵家骝  席继楼  刘大鹏  于华  陈军营 《地球物理学报》2011,54(7):1842-1853

潮汐地电场表现出近正弦形态,形态持续全天属TGF-A型,只在午前午后出现属TGF-B型,两类潮汐地电场前5阶谐波周期分别是23～24、12、7.9、6、4.8h.不同场地的潮汐地电场振幅谱可能有差异,周期变化的径向、切向月球潮汐力的振幅谱也存在差异.岩石裂隙面分布不同,则各向潮汐力对裂隙的作用效果不同,这可能是导致潮汐...  相似文献   

Modelling impact of northerly wind-generated waves on sediments resuspensions in the Dover Strait and adjacent waters     

Nicolas Guillou  Georges Chapalain 《Continental Shelf Research》2011,31(18):1894-1903

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The formation of tidal sand waves: Fully three-dimensional versus shallow water approaches     

Paolo Blondeaux  Giovanna Vittori 《Continental Shelf Research》2011,31(9):990-996

Tidal sand waves, also named tidal dunes, are large scale bedforms generated by the growth of perturbations of the sea bottom driven by tidal currents. Indeed, the interaction of an oscillatory tidal current with a bottom waviness gives rise to steady recirculating cells which tend to drag the sediment from the troughs towards the crests of the bottom perturbation. The net motion of the sediment towards the crests is opposed by gravity force and the growth of the perturbation is controlled by a balance between these two effects. In the literature, to determine the conditions which lead to the formation of sand waves and to determine the characteristics of the bedforms generated by this instability mechanism, both fully three-dimensional and shallow water approaches are employed. The shallow water approach is computationally less expensive than the fully three-dimensional one but, in many cases, it might be less accurate. This paper compares the quantitative predictions obtained by means of the two approaches and quantifies the range of the parameters such that the shallow water approximation provides reliable predictions.  相似文献   

Verifying the body tide at the Canary Islands using tidal gravimetry observations   总被引：1，自引：0，他引：1  

J. Arnoso  M. Benavent  M.S. Bos  F.G. Montesinos  R. Vieira 《Journal of Geodynamics》2011,51(5):358-365

Gravity tide records from El Hierro, Tenerife and Lanzarote Islands (Canarian Archipelago) have been analyzed and compared to the theoretical body tide model (DDW) of Dehant el al. (1999). The use of more stringent criterion of tidal analysis using VAV program allowed us to reduce the error bars by a factor of two of the gravimetric factors at Tenerife and Lanzarote compared with previous published values. Also, the calibration values have been revisited at those sites. Precise ocean tide loading (OTL) corrections based on up-to-date global ocean models and improved regional ocean model have been obtained for the main tidal harmonics O₁, K₁, M₂, S₂. We also point out the importance of using the most accurate coastline definition for OTL calculations in the Canaries. The remaining observational errors depend on the accuracy of the calibration of the gravimeters and/or on the length of the observed data series. Finally, the comparison of the tidal observations with the theoretical body tide models has been done with an accuracy level of 0.1% at El Hierro, 0.4% at Tenerife and 0.5% at Lanzarote.  相似文献   

调整形变观测思路探寻地震预报的新途径          下载免费PDF全文

范雷彪  任忠 《地震工程学报》2011,33(4):408-412

应用现有的仪器设备和技术手段,避开各种干扰因素捕捉新的观测要素,为地震预报提供可靠的前兆信息,本文提出了一种新的观测方案.新方案由三部分构成:一是在观测思路上将作用力作为观测目标;二是在台站的布局中改变现行的独立观测方式,以局域台站组的形式来集中布设观测点;三是对形变仪中的水管仪和伸缩仪布设方式进行调整,由单分量方向线上的相对观测改为两套仪器就同一固定点进行绝对值观测.  相似文献   

多腔扁钢管混凝土斜折柱抗震性能试验研究     

曹万林  关美荣  王立长  董宏英  张建伟 《地震工程与工程振动》2011,31(5):39-42

大连国际会议中心结构幕墙柱中,采用了一种扁钢管混凝土斜折柱.文中结合该工程设计,进行了2个1/3缩尺的扁钢管混凝土斜折柱试件的低周反复荷载试验,1个试件为普通扁钢管混凝土斜折柱,1个试件为多腔扁钢管混凝土斜折柱.比较分析了两个试件的承载力、刚度、延性、滞回特性及破坏特征.研究表明:多腔扁钢管混凝土斜折柱与普通扁钢管混凝...  相似文献   

非晶硅面阵探测器数字透射成像试验探讨     

张祥春  姜迎春  蔡良续  王曼 《CT理论与应用研究》2011,20(2):221-226

通过对钢板试件的数字透射成像检测试验,分析并研究了非晶硅面阵探测器成像检测系统、透照参数、检测工艺与检测图像质量的关系,并给出了检测过程中应该注意的问题.具体试验表明:面阵探测器X射线数字成像系统在一定厚度范围内的像质计灵敏度优于同厚度的射线照相B级要求.  相似文献