不排水条件下裂隙流体压力对引潮高的振幅比和位相差的响应     

刘春平  石云  万飞 《中国地震》2011,27(3):300-308

本文基于裂隙潮汐应力分析,提出了不排水条件下,单裂隙和多裂隙流体压力-引潮高的振幅比和位相差响应模型.基于响应模型的分析计算,绘制了单裂隙流体压力振幅比和位相差与裂隙产状的关系曲线,分析了岩体弹性参数(λ、μ)和Skempton系数(B)对裂隙流体压力振幅比和位相差的影响.结果表明,M2和O1波裂隙流体压力-引潮高的振幅比随裂隙倾角(DIP)增加而增加,位相差都在±165°～±180°( DIP＜ 15°)和0°～±10°(DIP＞15°)之间,且两波位相差符号相反;流体压力振幅比线性地响应岩体弹性常数(λ、μ)和Skempton系数(B)的变化,但位相差几乎不受裂隙和岩体弹性参数的影响.  相似文献   

A spectral mixture model analysis of the Kuroshio variability and the water exchange between the Kuroshio and the East China Sea   总被引：1，自引：0，他引：1  

宋军  薛惠洁  鲍献文  吴德星  柴扉  施磊  姚志刚  王勇智  南峰  万凯 《中国海洋湖沼学报》2011,29(2):446-459

For understanding more about the water exchange between the Kuroshio and the East China Sea,We studied the variability of the Kuroshio in the East China Sea(ECS) in the period of 1991 to 2008 using a three-dimensional circulation model,and calculated Kuroshio onshore volume transport in the ECS at the minimum of 0.48 Sv(1 Sv ;106 m3/s) in summer and the maximum of 1.69 Sv in winter.Based on the data of WOA05 and NCEP,The modeled result indicates that the Kuroshio transport east of Taiwan Island decreased since 2000.Lateral movements tended to be stronger at two ends of the Kuroshio in the ECS than that of the middle segment.In addition,we applied a spectral mixture model(SMM) to determine the exchange zone between the Kuroshio and the shelf water of the ECS.The result reveals a significantly negative correlation(coefficient of-0.78) between the area of exchange zone and the Kuroshio onshore transport at 200 m isobath in the ECS.This conclusion brings a new view for the water exchange between the Kuroshio and the East China Sea.Additional to annual and semi-annual signals,intra-seasonal signal of probably the Pacific origin may trigger the events of Kuroshio intrusion and exchange in the ECS.  相似文献   

南京市城市居民对乡村旅游发展的感知及旅游行为研究   总被引：2，自引：0，他引：2  

万绪才  丁敏  张钟方  赵君  董郭静 《地域研究与开发》2011,30(6):102-105,110

运用问卷调查法和基于SPSS软件的统计分析法,以南京市为例,从城市居民感知视角考察乡村旅游的发展情况。从旅游偏好、旅游频率和空间分布等方面探讨城市居民的乡村旅游行为特征,并进一步分析了乡村旅游的知晓度、居民对各乡村旅游点开发水平的感知与其空间分布之间的相关关系,以及居民对乡村旅游发展总体印象与旅游频率之间的相关关系。在此基础上,提出南京市乡村旅游发展的有关对策与建议。  相似文献   

中原城市群与产业群耦合发展研究     

万宇艳 《地域研究与开发》2015,(3):7-11,16

依托空间偏离-份额模型建立了产业群与城市群耦合发展的基本分析框架,并对中原城市群进行了定量诊断。研究结果表明:2001—2013年间,首位城市郑州的产业实力和集聚扩散能力显著提升,产业群与城市群的耦合在地理空间呈圈层式扩展态势,然而城市群尚未形成功能等级与分工协作明确的区域综合经济体。继续实施中心城市带动战略、发挥成员城市比较优势促进城际产业链接、完善城市群综合交通运输网络是促进产业群与城市群耦合、提高群域经济发展水平和增强城市竞争力的有效手段。  相似文献   

基于光学立体和InSAR的Grove山地区DEM建立和分析          下载免费PDF全文

万雷  周春霞  鄂栋臣 《极地研究》2015,27(1):83-90

本文分别利用光学立体和In SAR技术生成了东南极Grove山地区15 m分辨率的ASTER DEM和20 m分辨率的In SAR DEM。在利用ASTER立体像对生成DEM的过程中引入ICESat测高数据作为高程控制以减少错误匹配,提高DEM垂直精度;而在利用ERS tandem数据生成DEM后,选取ICESat测高数据对In SAR DEM进行倾斜面纠正,以消除基线不精确估计等带来的影响。通过与未作控制的ICESat测高数据进行比较,评价了两种DEM的精度并对误差进行了分析。同时,比较了两种DEM的差异,并分析了造成这些差异的原因,探讨了两种技术生成南极冰盖DEM的优势和不足。最后结合两DEM的优势,融合生成了Grove山地区高精度的DEM。  相似文献   

相似路径台风“派比安”（2006）和“威马逊”（2014）前部飑线过程对比分析          下载免费PDF全文

万明  陈云辉  支树林  吴媛 《气象与减灾研究》2015,38(3):43-52

利用常规观测、雷达资料和NCEP 1°×1°再分析资料,对路径相似台风"派比安"(2006)和"威马逊"(2014)的前部飑线过程进行对比分析。结果表明,地面辐合线和边界层辐合系统为台前飑线的发生发展提供了必要的动力条件,持续强盛的东南急流提供了充足的水汽和能量输送。低层暖、高层冷且具有较大垂直温差的特征为台前飑线的形成提供了有利的热力不稳定条件,而强的CAPE积累和释放有利于对流强度的加强。高空槽并入台风倒槽有利于延长飑线的生命史。台前飑线从垂直风切变相对较弱的区域移入较强的区域有利于其组织和发展,反之则不利于其组织和维持。台前飑线移动路径前方存在水汽辐合有利于其发展,反之则不利于其维持。  相似文献   

Spatial and Temporal Dynamics of Urban Heat Island and Their Relationship with Land Cover Changes in Urbanization Process: A Case Study in Suzhou, China   总被引：4，自引：0，他引：4  

Yongming Xu  Zhihao Qin  Hongxiu Wan 《Journal of the Indian Society of Remote Sensing》2010,38(4):654-663

One of the significant environmental consequences of urbanization is the urban heat island (UHI). In this paper, Landsat TM images of 1986 and 2004 were utilized to study the spatial and temporal variations of heat island and their relationships with land cover changes in Suzhou, a Chinese city which experienced rapid urbanization in past decades. Land cover classifications were derived to quantify urban expansions and brightness temperatures were computed from the TM thermal data to express the urban thermal environment. The spatial distributions of surface temperature indicated that heat islands had been largely broadened and showed good agreements with urban expansion. Temperature statistics of main land cover types showed that built-up and bare land had higher surface temperatures than natural land covers, implying the warming effect caused by the urbanization with natural landscape being replaced by urban areas. In addition, the spatial detail distributions of surface temperature were compared with the distribution of land cover by means of GIS buffer analysis. Results show remarkable show good correspondence between heat island variations with urban area expansions.  相似文献   

A new model for the vibration isolation via pile rows consisting of infinite number of piles     

Jian‐Fei Lu  Dong‐Sheng Jeng  Jian‐Wei Wan  Ji‐Sheng Zhang 《国际地质力学数值与分析法杂志》2013,37(15):2394-2426

In this study, on the basis of the Floquet transform method, a numerical model for the simulation of the vibration isolation via multiple periodic pile rows with infinite number of piles is established. By means of the fictitious pile method due to Muki and Sternberg, the second kind of Fredholm integral equations for the pile rows are developed by using the fundamental solutions for the half‐space and the compatibility conditions between the piles and half‐space. Employing the Floquet transform method, integral equations for the pile rows in the wavenumber domain are then derived. Solution of the integral equations yields the wavenumber domain solution for the pile rows. The space domain solution can then be retrieved by inversion of the Floquet transform. Numerical results show that the proposed model with the Floquet transform method is in a good agreement with those of the conventional direct superposition method. On the basis of the new model, influences of the spacing between neighboring piles, the Young's modulus of the piles, and the pile length on the vibration isolation effect of the pile rows are investigated. Numerical simulations conducted in this study show that compared with the direct superposition method, the efficiency of the proposed model for simulation of the vibration isolation via pile rows is very high. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

An interconnect width and spacing optimization model considering scattering effect     

朱樟明  万达经  杨银堂 《海洋学报(英文版)》2010,29(9)

As the feature size of the CMOS integrated circuit continues to shrink, the more and more serious scattering effect has a serious impact on interconnection performance, such as delay and bandwidth. Based on the impact of the scattering effect on latency and bandwidth, this paper first presents the quality-factor model which optimises latency and bandwidth effectively with the consideration of the scattering effect. Then we obtain the analytical model of line width and spacing with application of curve-fitting method. The proposed model has been verified and compared based on the nano-scale CMOS technology. This optimisation model algorithm is simple and can be applied to the interconnection system optimal design of nano-scale integrated circuits.  相似文献   

One‐dimensional consolidation with a threshold gradient: a Stefan problem with rate‐dependent latent heat     

Yang Zhou  Wan‐kui Bu  Meng‐meng Lu 《国际地质力学数值与分析法杂志》2013,37(16):2825-2832

During the process of one‐dimensional consolidation with a threshold gradient, the seepage front moves downward gradually, and the problem is indicated as a Stefan problem. The novel feature in this Stefan problem is a latent heat that varies inversely with the rate of the moving boundary. An exact solution for the external load that increases in proportion to the square root of time is constructed using the similarity transformation technique. Computational examples concerning the effect of different parameters on the motion of the seepage front are presented. The exact solution provides a worthwhile benchmark for verifying the accuracy of numerical and approximate methods. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献