额济纳233年来胡杨树轮年表的建立 及其所记录的气象、水文变化^*   总被引：7，自引：9，他引：7       下载免费PDF全文

孙军艳  刘禹  蔡秋芳  W.K.Park  李保生  史江峰  易亮  宋慧明  李强 《第四纪研究》2006,26(5):799-807

通过胡杨树轮宽度的分析,建立了内蒙古额济纳地区过去233年来的STD,RES和ARS年表;并将树轮STD年表与采样点附近额济纳气象站的气温、降雨量以及狼心山水文站的地下水水位等记录进行了相关分析。结果表明,在额济纳地区显著影响该地胡杨生长的主要限制因子是地下水水位。胡杨树轮宽度年表与冬季及全年地下水水位相关性最高,分别为-0.808(p＜0.01)和-0.724(p＜0.05)。在此基础上,设计转换方程,重建了额济纳地区过去232年来冬季及全年地下水水位变化历史,冬季地下水水位重建方程的解释方差达76.3 % (调整自由度后为70.4 ％ ,n=11,r=0.874,F=12.881,p＜0.003),全年地下水水位重建方程的解释方差为72.8 ％ (调整自由度后为66.1 ％ ,n=11, r=0.854,F=10.731,p＜0.005)。  相似文献   

Run off-on-out method and models for soil infiltrability on hill-slope under rainfall conditions   总被引：3，自引：0，他引：3  

LEI Tingwu  LIU Han  PAN Yinghua  ZHAO Jun  ZHAO Shiwei  YANG Yonghui 《中国科学D辑(英文版)》2006,49(2):193-201

Infiltration is the process of water penetrating into soil, generally referred to as the downward movement of water from the soil surface[1,2]. This process is af-fected by water supply and the soil infiltrability, de-termines the amounts of water entering into soil pro-file and the surface runoff. Infiltrability is defined as the infiltration flux of a unit area under atmospheric pressure and sufficient water supply. The actual infil-tration rate and/or the infiltrability is expressed in m/s …  相似文献   

Torsional response of pile embedded in a poroelastic medium   总被引：1，自引：0，他引：1  

Yuanqiang Cai  Gang Chen  Changjie Xu  Dazhi Wu 《Soil Dynamics and Earthquake Engineering》2006,26(12):1143-1148

The response of a cylindrical elastic pile embedded in a homogeneous poroelastic medium and subjected to torsional loading is studied for the first time. Based on the Muki's model, the pile-porous medium system is decomposed into a fictitious pile system and an extended porous medium system. The one-dimensional, vertical, elastic pile and the three-dimensional poroelastic medium are solved, respectively. Considering the mixed boundary-value conditions at the interface of pile and soil, a Fredholm's integral equation of the second kind for the bar-force is established. The force and the displacement of the pile are calculated by applying numerical quadrature.  相似文献   

The Contemporary Tectonic Strain Rate Field of Continental China Predicted from GPS Measurements and its Geodynamic Implications   总被引：7，自引：0，他引：7  

Shoubiao Zhu  Yongen Cai  Yaolin Shi 《Pure and Applied Geophysics》2006,163(8):1477-1493

In Appling studies, the strain rate in China has been computed from using different methods, resulting in quite different estimates of the strain rate the geo-statistics from GPS velocity field of Chinese continent, we obtain the velocity value at each little regularly spaced grid point, by kriging interpolation and the component of strain rate for each volume element, using a method similar to the derivation of shape functions in the finite element algorithm. Therefore the distribution of the strain rate field in whole for the Chinese continent is presented. The result shows that the orientations of principal strain rates are consistent with those of the P and T axes of focal mechanisms. The distribution of maximum shear strain rate clearly delineates some major active fault zones surrounding the Tibetan Plateau. The maximum shear strain rate is comparable with that obtained from analysis of seismic moment release. In part of the Tibetan Plateau containing normal faults and pull-apart grabens, we obtain an extensional state of strain. The absolute value of the strain rate in West China is approximately 5 times larger than that of East China, and the pattern of the strain rate field in most of the Chinese continent is controlled by the India/Eurasia collision.  相似文献   

大庆长垣反转构造样式及其识别方法   总被引：2，自引：0，他引：2  

ZHAO Bin LIU Cai WANG Shi-yu LI Peng LIU Yang FENG Xuan College of GeoExploration Science  Technology  Jilin University  Changchun  China 《吉林大学学报(地球科学版)》2006,(Z2)

大庆长垣位于松辽盆地中部坳陷区,其内部的反转构造主要分为断层控制型和非断层控制型。探讨了伸展构造体系中反转构造的识别方法,同时分析了反转构造与油气聚集的关系,对今后找寻油气藏具有指导意义。  相似文献   

A lumped parameter approach to model the treatment of organic contaminants by a granular iron filled fracture     

Zuansi Cai  Neil R. Thomson  Ryan D. Wilson  Sascha E. Oswald 《Advances in water resources》2006

  相似文献   

"WDC中国地震数据中心建设与完善"项目成果介绍     

蔡晋安  赵仲和  黄伟  刘瑞丰  薛峰  吴敏  周克昌  王松  王宜 《国际地震动态》2006,(9):35-37

本文详细介绍了“WDC中国地震数据中心建设与完善”项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。  相似文献   

福建数字遥测台网单台震级偏差研究     

蔡杏辉  段刚  黄其昌 《福建地震》2006,(Z2)

使用福建数字遥测台网产出的观测报告,计算各台站单台震级与台网平均震级偏差和标准离差,分析了产生震级偏差的原因,并给出了台基校正值。结果显示,震级偏差主要来自于各台站的综合影响,进行台基校正是有意义的。  相似文献   

Experimental Research of Gas Hydrate Drilling Fluids Using Polyethylene Glycol as an Inhibitor     

张凌蒋国盛  涂运中蔡记华 窦斌张家铭  宁伏龙 《中国地质大学学报(英文版)》2006,17(3):276-282

INTRODUCTION Gas hydrate is anice-like crystal compound gen-erally formed by water and natural gas molecules ,whichis mainly distributed under the oceanfloor andin the permafrost andis viewed as an energy resourcewith great potential (Jiang et al .,2002) .For the rel-ative exploration and development of gas hydrate inChina ,some specialists and scholars have suggestedthat relative test drilling exploitation should be donein the permafrost (Liu,2005 ; Li and Geng,2000) .Drillingin the per…  相似文献   

渔塘坝硒矿硅质岩的地球化学特征及成因   总被引：10，自引：2，他引：8  

冯彩霞  刘家军  刘燊  李志明  李恩东 《沉积学报》2002,20(4):727-732

渔塘坝硒矿床是目前我国发现含硒量 (85 90× 10 -6)最高的小型独立硒矿床 ,其赋矿岩石主要为硅质岩 ,且发育程度较高。早二叠世晚期的黑色碳质硅质岩系 ,是区内的赋矿层位 ,它局限于特定的沉积相位 ,即碳酸盐台地海盆浅部沼泽 (藻沼 )环境沉积的黑色碳质硅质岩相带 ,硒矿化层和这套碳质硅质岩相带密切相关 ,其矿化相带呈NW向展布。硅质岩的SiO2 含量变化较大 (6 4 .2 %～ 94 .85 % ) ,平均为 75 .9% ;Fe2 O3 、FeO、MnO、TiO2 、Al2 O3 和MgO等含量相对较高 ,与其它热水成因硅质岩相近 ;硅质岩富含As、Sb、Fe和Ag ,而贫Cu、Co和Ni;在Al Fe (Cu +Co +Ni)三角图、U—Th相关图和P2 O5 Y相关图上的投影特征 ,也同样显示出硅质岩的热水成因特征。另本区硅质岩中的Cr含量较大 ,且 (Fe +Mn) /Ti的比值为 6 .34,这表明硅质岩在成因上还可能和二叠纪峨眉山玄武岩喷发的火山作用有一定的联系  相似文献