利用Jason-1数据监测呼伦湖水位变化   总被引：8，自引：2，他引：6  

褚永海  李建成  姜卫平  张燕 《大地测量与地球动力学》2005,25(4):11-16

卫星测高为内陆水域水位变化的实时和连续监测提供了一种高效的技术工具．但是这种应用受到数据点覆盖稀疏的限制。利用Jason-13年（2002-2004）GDRs测高数据作简单的数据编辑,并进行必要的地球物理改正．最后得到内蒙古地区呼伦湖水位变化的时间序列。呼伦湖地区由于近年来持续干旱,水位呈现明显的下降趋势．年平均下降约0．3～0．5m。在一般的内陆水域．水位变化主要取决于降雨量和蒸发量,所以,根据卫星测高所得的水位变化信息．可以为区域气候变化的研究提供一种全新的技术与方法。  相似文献   

库车再生前陆盆地冲断构造楔特征   总被引：60，自引：4，他引：56  

卢华复  贾承造  贾东  陈楚铭  刘志宏  王国强  王胜利 《高校地质学报》2001,7(3):257-271

库车再生前陆盆地冲断构造楔由一系列向南运动的逆冲断层和相关褶皱组成。冲断楔的北部以断层转折褶皱、断层传播褶皱、双重逆冲构造为主。断层楔的前缘发育了很好的滑脱膝折背斜,全为盲断层控制,形成隐蔽式前锋。冲断层的就位从中新世开始,自北向南迁移,前锋的构造形成在第四纪。造成逆冲断层的地壳水平缩短作用速度在中新世较慢,平均为0．355mm/a,上新世中期达0．82mm/a,而到上新世晚期和第四纪速度增大了约一个数量级,达到1．29－3mm/a。  相似文献   

3种模式下钻孔灌注桩桩-土剪切特性现场试验研究     

吴爽爽  胡新丽  龚辉  周昌  徐楚  王强  应春业 《岩土力学》2019,(7):2838-2846

不同的桩-土剪切模式对桩-土剪切位移量的大小和桩侧摩阻力的发挥有重要影响。对抗压桩、顶拔桩和负摩擦桩等3种模式的6根钻孔灌注桩的剪切特性进行了现场加载试验与长期监测。通过对不同桩型的桩身应变、桩顶位移和桩周土沉降等试验资料的系统分析,建立了"侧阻-位移"曲线确定各模式桩-土剪切位移量和不同深度的极限侧阻力。根据不同桩-土剪切模式极限侧阻力的发挥特征,分析了桩-土相对运动方向、剪切边界约束条件、剪切位移量、加载速率和剪切历时等5个因素对极限侧阻力发挥的不同影响。讨论了利用现场顶拔桩试验结果对桩负摩阻力增大段的极限负摩阻力进行预测的可行性,供同行参考借鉴。  相似文献   

新疆巴里坤下泥盆统大南湖组的厘定与生物地层分析     

初建朋  孙荣涛  亓辉  杨怀龙  赵文皓 《新疆地质》2019,(3):343-347

依据岩性、岩相及古生物等资料,将新疆巴里坤一带的一套早泥盆世地层厘定为下泥盆统大南湖组,并可分为下上两部分:下部以沉积碎屑岩为主,上部以火山岩和火山碎屑岩为主;从阿也尔苏剖面中采集到的Atrypa、Ca marotoechia、Howellella、Megastrophia和Leptaenopyxis等腕足化石,可与准噶尔盆地西部下泥盆统顶部的芒克鲁组、东部下泥盆统托让格库都克组等地层对比,化石组合呈现早泥盆世晚期(埃姆斯期)特征。生物地理区系分析认为,该地腕足动物同新疆北部准噶尔、东北北部、内蒙古等地同属老世界大区的巴尔喀什-蒙古-鄂霍茨克区。通过生物地层的分析,使研究区该组地质时代有了确切的化石依据,有利于该地泥盆纪地层层序的厘定和地层格架的完善。  相似文献   

劳盆地与马努斯盆地俯冲熔体与流体组分的识别——Sr-Nd-Pb同位素与独立成分分析     

伍锡昌  初凤友  王巍  李正刚  陈灵  毕冬伟  王建强 《吉林大学学报(地球科学版)》2019,49(2):414-424

为了探讨俯冲沉积物与蚀变洋壳组分对弧后盆地岩浆作用的影响,利用独立成分分析从劳盆地、马努斯盆地,以及太平洋与印度洋共634组Sr-Nd-Pb同位素数据中提取了5个独立成分(IC1—IC5)。其中:IC1与_87Sr/_86Sr、Th/Nb值为负相关关系,表明其能够代表弧下地幔中的俯冲沉积物熔体组分的影响,能够很好地区别弧后盆地与洋中脊;弧后盆地IC5与Ba/Th值为负相关关系,暗示其能够反映弧下地幔中的俯冲蚀变洋壳脱水流体组分的影响;IC5与κ值(1.03Th/U)之间的关系,也说明洋中脊IC5可能与地幔中再循环蚀变洋壳的年龄有关。进而通过对比马努斯和劳盆地岩石中IC1与IC5间的差异,发现马努斯盆地东部裂谷(ER)表现出绝对值更高的IC1负异常以及与劳盆地相似的IC5特征,而马努斯盆地扩张中心与扩张转换带(MSC&ETZ)则表现出类似劳盆地的IC1特征以及更高的IC5正异常特征。两个盆地间的差异表明,ER更多地受到沉积物熔体组分影响,MSC&ETZ更少地受到俯冲洋壳脱水流体组分影响。其中,沉积物熔体组分影响可能与New Britain trench与Tonga trench巨大的沉积物厚度差异有关,而俯冲洋壳脱水流体组分影响可能受到了弧后扩张中心与俯冲带间距离的控制。  相似文献   

Soil bio-cementation using a new one-phase low-pH injection method     

Cheng  Liang  Shahin  Mohamed A.  Chu  Jian 《Acta Geotechnica》2019,14(3):615-626

Acta Geotechnica - Soil bio-cementation via microbially induced carbonate precipitation (MICP) has been extensively studied as a promising alternative technique to traditional chemical cementing...  相似文献   

Application of WRF 3DVar to a high-resolution model over Beijing area     

ShuiYong Fan  Y.R. Guo  Ming Chen  JiQin Zhong  YanLi Chu  W. Wang  X.Y. Huang  YingChun Wang  Y.H. Kuo 《寒旱区科学》2009,1(2):0135-0142

To improve the weather forecasting over the Beijing area for the 2008 Olympic Games,a triple-nested(27/9/3km) WRFVar/WRF system with 3-h update cycle was established.Experiments have been done for a convective event that occurred on August 1,2006.The results showed that the high-resolution rapid update cycle gave a good precipitation forecast;the tunings of background error statistics(BES) and observation-error statistics in WRFVar improved the skill of the precipitation forecast;the BES for the fine domain(3 km) obtained by interpolation from its parent domain(9 km) can be used in 3 km WRFVar as a reasonable approximation.The user can now save a great deal of work related to the derivation of the fine mesh BES from the forecast over a period of time;the rapid update cycle with 3-h frequency has satisfied the forecast,and the update cycle with 1-h frequency was not necessary.  相似文献   

Evolving patterns of the fluids within the TAG hydrothermal field     

HuaiMing Li  ShiKui Zhai  ZengHui Yu  ChunHui Tao  FengYou Chu 《中国科学D辑(英文版)》2009,52(1):29-37

The mixing of seawater/hydrothermal fluid within the large seafloor hydrothermal sulfide deposits plays a key role in the formation processes of the sulfide deposits. Some issues attract considerable attentions in the study of seafloor hydrothermal system in recent years, such as the relationships among different types of vent fluids, the characteristics of chemical compositions and mineral assemblages of the hydrothermal deposits and their governing factors. Combined with the measured data of hydrothermal fluid in the TAG field, the thermodynamic model of mixing processes of the heated seawater at different temperatures and the hydrothermal fluid is calculated to understand the precipitation mechanism of anhydrite and the genetic relationships between the black and white smoker fluids within the TAG mound. The results indicate that the heating of seawater and the mixing of hydrothermal fluid/seawater are largely responsible for anhydrite precipitation and the temperature of the heated seawater is not higher than 150°C and the temperature of the end-member hydrothermal fluid is not lower than 400°C. Based on the simulated results, the evolving patterns of fluids within the TAG deposit are discussed. The mixed fluid of the end-member hydrothermal fluid and the seawater heated by wall rock undergoes conductive cooling during upflowing within the deposit and forms “White Smoker” eventually. In addition, the end-member hydrothermal fluid without mixed with seawater, but undergoing conductive cooling, vents out of the deposit and forms “Black Smoker”. Supported by China Ocean Mineral Resources Research and Development Association Program (Grant No. DY115-02-1-01) and National Basic Research Program of China (Grant No. G2000078503)  相似文献   

粒度对韧性剪切带岩石变形的影响   总被引：3，自引：0，他引：3       下载免费PDF全文

樊光明  曾佐勋 《地球科学》2000,25(2):159-162

构造模拟研究表明, (1) 粒度是控制岩石流变性质的重要因素之一, 粒度越粗, 岩石粘度越高; (2) 粒状矿物含量与基质的比值越低, 粒度对岩石流变性质的影响就越小, 反之则越大; (3) 岩石的粒度差异对韧性剪切带的发育程度有着重要影响, 粒度越细, 韧性剪切带中有限应变越大.这些结果与野外所观察的地质现象及应变测量结果完全一致.   相似文献   

The effect of PCBs on glycogen reserves in the eastern oyster Crassostrea virginica.     

V Encomio  F L Chu 《Marine environmental research》2000,50(1-5):45-49

Recent declines in Chesapeake Bay oyster populations have been attributed to disease, and reduced water quality from pollution. The stress associated with pollutant exposure may reduce energy available for growth and reproduction. Polychlorinated biphenyls (PCBs) are lipophilic contaminants that may potentially affect mobilization of lipid reserves, increasing reliance on glycogen stores, which could otherwise be utilized to supply energy for gametogenesis. Thus, PCBs may indirectly affect glycogen stores in oysters in a deleterious manner. To test for this effect, reproductively inactive oysters were exposed to PCBs by feeding individuals 0.7 g of algal paste containing 0, 0.35, or 3.5 micrograms PCBs daily for 8 weeks. Additionally, a group of oysters was exposed to PCBs (0, 0.35, and 3.5 micrograms) plus 0.3 g of non-toxic artificial sediment to examine interactive effects of sediment particles and PCBs. Adductor muscle, mantle, and gonadal tissues were analyzed for glycogen content. Results suggest that glycogen content is reduced in the adductor muscle with increasing PCB exposure, but there are no effects of PCBs in the mantle and gonadal tissues.  相似文献