基于SBAS- InSAR技术的西藏雄巴古滑坡变形特征   总被引：2，自引：0，他引：2  

闫怡秋  郭长宝  张永双  张绪教  郑岳泽  李雪  杨志华  吴瑞安 《地质学报》2021,95(11):3556-3570

大型古滑坡及其强变形和复活灾害日益频发,已造成重大灾害事件和严重损失.古滑坡的发育、变形影响因素多、机理复杂和识别难度大,本文采用SBAS-InSAR技术,结合遥感解译,获取了金沙江西岸雄巴村古滑坡2017年10月至2020年6月间的地表变形特征.研究表明,雄巴古滑坡方量巨大,可达2.6×108～6×108 m3,根据InSAR形变监测结果,滑坡前缘发育H1和H2等2个大型强变形区,变形级别分为4级:极强变形区(-132.1 mm/a≤VLOS＜-58.5 mm/a)、强变形区(-58.5 mm/a≤VLOS＜-20.3 mm/a)、中等变形区(-20.3 mm/a≤VLOS＜l.8 mm/a)和弱变形区(1.8 mm/a≤VLOS＜55.4 mm/a);其中H1变形区,最大累计变形量达203.8 mm,H2变形区变形量达302.1 mm.受金沙江河流侵蚀,特别是上游75 km的2018年10月和11月白格2次滑坡-堵江-溃坝-泥石流/洪水灾害链对雄巴古滑坡坡脚的侵蚀,加剧了雄巴古滑坡的变形,其中H1变形区的蠕滑速率是白格滑坡灾害链发生前的14～16倍,灾害链引起H2区发生变形,雄巴古滑坡整体呈现牵引式复活状态.基于SBAS-InSAR的形变监测结果得到了野外的验证,目前H1变形区前缘出现局部垮塌,滑体中横向和竖向裂缝发育,局部呈现拉张状态.雄巴古滑坡目前呈现持续变形中,部分地段为加速变形,雄巴古滑坡发生大规模复活将导致堰塞金沙江-溃坝-泥石流灾害链,应加强雄巴古滑坡的空—天—地一体化监测预警,为该区正在规划建设的重大工程和流域性地质安全风险提供技术支撑和科学依据.  相似文献   

The Impact of Climatic and Environmental Factors on n-Alkanes Indices in Southwestern Tibetan Plateau     

LING Yuan  ZHENG Mianping  WANG Shuxian  SUN Qing  XIE Bingjing  ZHANG Chengjun 《《地质学报》英文版》2021,95(2):648-658

n-Alkanes are widely used in paleoenvironmental reconstructions.However,our understanding of changes in the distribution of n-alkanes with climatic and environmental factors remains unclear in arid/semi-arid regions.We sampled 26 surface sediments from three climatic zones across the southwestern Tibetan Plateau to evaluate the sensitivity of chain length distributions of n-alkanes to climatic and environmental parameters.Our observations demonstrate that average chain length (ACL), proportion of aquatic macrophyte (Paq),carbon preference index (CPI) and ratio of the contents of nC27 and nC31 (nC27/nC31) are all sensitive to hydroclimatic conditions.In contrast to commonly-adopted assumptions,the correlations between these indices and hydrological parameters are not always good,which indicates that the interpretation of n-alkane indices is special on the southwestern Tibetan Plateau.These might be related to the vegetation characteristics and seasonality of biological activity,and need to be considered in paleoclimatic reconstruction.The impact of seasonal precipitation on n-alkanes indices was also evaluated.  相似文献   

绿色交通目标下集装箱“公转铁”的CO2减排潜力评估     

陶学宗  吴琴  尹传忠 《气候变化研究进展》2019,15(6):660-669

为提高集装箱“公转铁”减排潜力评估结果的准确性,在分析“公转铁”减排原理的基础上,综合考虑空箱调运和重箱运输“门到门”运输链的干线运输、端点装卸、电力设备作业、集卡短驳、公铁中转等排放,引入反映活动类型、设备结构、能源生命周期排放的参数,对作业活动-方式结构-能耗强度-排放因子（ASIF）方法进行改进,建立“公转铁”减排潜力评估框架。以义乌—宁波港域出口集装箱运输为例,通过实地调研和公开文献获取数据,进行实证研究。结果表明,如果忽略必要因素将会导致每TEU运输需求“公转铁”的CO₂减排率被高估0.50~36.73个百分点;最佳“公转铁”情景可减排3.42万t CO₂,相应减排率为13.58%。研究结果可为政府相关部门客观评估“公转铁”的减排潜力、制定有效的“公转铁”政策措施提供理论支持。  相似文献   

基于医疗联盟链的数据安全保护方法     

孙回  程徐  黄琤  陈付龙 《南京气象学院学报》2019,11(5):567-572

随着互联网的飞速发展,医疗数据爆炸性增长,大量的医疗数据面临着安全共享问题.本文提出了一种基于医疗联盟链的数据安全保护方法,其中包括提出了一种安全认证与访问控制模型,并将查询逻辑分离存储技术引入该模型中,同时描述了基于医疗联盟链的认证凭据和访问权限数据的存储和访问.基于医疗联盟链的安全认证与访问控制模型包含了三个角色,第一角色是患者,第二角色是医护人员,第三角色是医疗联盟链.通过查询逻辑分离存储技术保护患者数据隐私,查询逻辑分离技术与医疗联盟链技术紧密结合,满足了不同医院之间医疗数据共享的需求,保障了患者的数据隐私和医护人员查阅数据的权限.  相似文献   

加强新疆锂资源规范管理和助力产业延伸的对策分析     

曹伟伟  段星星  陈世忠  邢浩  米宝昕  杨振  周玉 《地质论评》2024,70(S1):323-324

  相似文献   

Elastic fields in two joined transversely isotropic media of infinite extent as a result of rectangular loading     

H. T. Xiao  Z. Q. Yue 《国际地质力学数值与分析法杂志》2013,37(3):247-277

This paper presents the closed‐form solutions for the elastic fields in two bonded rocks induced by rectangular loadings. Each of the two bonded rocks behaves as a transversely isotropic linear elastic solid of semi‐infinite extent. They are completely bonded together at a horizontal surface. The rectangular loadings are body forces along either vertical or horizontal directions and are uniformly applied on a rectangular area. The rectangular area is embedded in the two bonded rocks and is parallel to the horizontal interface. The classical integral transforms are used in the solution formulation, and the elastic solutions are expressed in the forms of elementary harmonic functions for the rectangular loadings. The stresses and displacements in the rocks induced by both the horizontal and vertical body forces are also presented. The numerical results illustrate the important effect of the anisotropic bimaterial properties on the stress and displacement fields. The solutions can be easily implemented for numerical calculations and applied to problems encountered in rock mechanics and engineering. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Influence of core property on multi-electron process in slow collisions of isocharged sequence ions with neon     

卢荣春  于得洋  邵曹杰  阮芳芳  蔡晓红 《海洋学报(英文版)》2010,29(11)

Influence of core property on multi-electron process in the collisions of q=6-9 and 11 isocharged sequence ions with Ne is investigated in the keV/u region. The cross-section ratios of double-, triple-, quadruple- and total multi-electron processes to the single electron capture process as well as the partial ratios of different reaction channels to the relevant multi-electron process are measured by using position-sensitive and time-of-flight techniques. The experimental data are compared with the theoretical predictions including the extended classical over-barrier model, the molecular Columbic barrier model and the semi-empirical scaling law. Results show a core effect on multi-electron process of isocharge ions colliding with Neon, which is consistent with the results of Helium we obtained previously.  相似文献   

Teleportation and thermal entanglement in two-qubit Heisenberg XYZ spin chain with the Dzyaloshinski—Moriya interaction and the inhomogeneous magnetic field     

高丹  赵振双  朱爱东  王洪福  邵晓强  张寿 《海洋学报(英文版)》2010,29(9)

This paper studies the average fidelity of teleportation and thermal entanglement for a two-qubit Heisenberg XYZ chain in the presence of both an inhomogeneous magnetic field and a Dzyaloshinski--Moriya interaction. It shows that for a fixed D_z, the increase of b_z will broaden the critical temperature at the cost of decreasing the thermal entanglement. And it can modulate the inhomogeneous magnetic field and the Dzyaloshinski--Moriya interaction for the average fidelity of teleportation to be optimal.  相似文献   

Pulse generation models for daily intermittent streamflows / Modèles de génération d’impulsions pour des débits journaliers intermittents     

《水文科学杂志》2013,58(3)

Abstract

Abstract Generating pulses and then converting them into flow are two main steps of daily streamflow generation. Three pulse generation models have been proposed on the basis of Markov chains for the purpose of generating daily intermittent streamflow time series in this study. The first one is based on two two-state Markov chains, whereas the second uses a three-state Markov chain. The third model uses harmonic analysis and fits Fourier series to the three-state Markov chain. Results for a daily intermittent streamflow data series show a good performance of the proposed models.  相似文献   

锡石的晶体结构和形态的关系          下载免费PDF全文

柴钢  王文魁 《岩石矿物学杂志》1988,7(4):374-381

本文对不同成因类型的锡石晶体形态进行了研究,并从PBC(周期性键链)理论出发,讨论了锡石晶体形态与晶体结构的关系。笔者认为,锡石晶体具有三种F面,即s{111}、e{101}、m{110},与Hartman对同样结构类型的金红石晶面性质划分有所差异。据锡石晶面结构性质所推导的理想晶体形态图,与晶体测量所得到的天然晶体形态图总体上相吻合。  相似文献