时序分析在危岩体监测数据处理中的应用

引入时间序列分析进行危岩体监测数据的处理,建立了危岩体变形的动态模型,取得了较好的拟会与预报精度。     

四渡河特大桥GPS控制网的布设及成果分析

介绍四渡河特大桥GPS控制网,采用一种新颖的平差计算方式,解决了与周边控制网的接边精度问题,解决了大山区大高差对GPS施工控制网的精度影响。实际验证了国产单频静态GPS接受机,也能进行高精度的施工控制测量。     

3维可视化校园信息系统的空间分析研究

数字校园是以网络为基础的系统,它利用先进的信息化手段和工具,实现从环境、资源到活动的全部数字化,拓展现实校园的时间和空间维度,提升传统校园的效率,拓展传统校园的功能,最终实现教育过程的全面信息化,从而达到提高教育管理水平和效率的目的。     

豫皖交界“梅山群”的古构造环境研究及其意义

摘要：“梅山群”是豫皖交界地段变质程度与佛子岭群、石炭系不同的变质岩系。它主要由斜长角闪岩、变粒岩、浅粒岩、云英片岩、角闪片岩、黑云片岩、大理岩和辉石岩等组成,在区域上可以和商城群歪庙组对比,形成时代为早古生代．对“梅山群”的岩石化学研究表明,其形成的古构造环境可能为弧后盆地。笔者认为早古生代,南北大陆板块构造的碰撞以华北板块仰冲、扬子板块俯冲为特征,大别造山带古缝合带的位置应在“梅山群”分布区域的南侧。     

基于SBAS-InSAR技术的金沙江流域沃达村巨型老滑坡形变分析

近年来突发性高位滑塌灾害日益频发,造成恶劣影响。这类地质灾害调查难度高、隐蔽性强,单靠群测群防和地质调查难以解决灾害的防治问题。随着雷达遥感卫星数据质量的不断提升,合成孔径干涉雷达测量(InSAR)中的SBAS-InSAR技术为特大型老滑坡灾前形变探测提供了新的技术途径。利用SBAS-InSAR技术对金沙江流域沃达村滑坡进行地表形变监测,获取了2017年3月30日至2019年9月28日内的形变结果,划定了强烈形变区(Ⅰ雷达)、均匀形变区(Ⅱ雷达),分析了滑坡复活区整体和局部滑塌地表形变速率、累积位移变化趋势和主裂缝形变情况。同时实地进行了工程地质调查和复核,发现老滑坡复活区变形迹象与SBAS-InSAR技术解译成果有着较好的一致性。表明SBAS-InSAR技术在复杂山区地质灾害监测预警领域有较为广阔的应用前景,为类似老滑坡监测预警提供了新的思路与借鉴。     

CFD modelling of a small–scale fixed multi–chamber OWC device

Wave Energy Converters (WECs) have excellent potential as a source of renewable energy that is yet to be commercially realised. Recent attention has focused on the installation of Oscillating Water Column (OWC) devices as a part of harbor walls to provide advantages of cost–sharing structures and proximity of power generation facilities to existing infrastructure. In this paper, an incompressible three–dimensional CFD model is constructed to simulate a fixed Multi–Chamber OWC (MC–OWC) device. The CFD model is validated; the simulation results are found to be in good agreement with experimental results obtained from a scale physical model tested in a wave tank. The validated CFD model is then used for a benchmark study of 96 numerical tests. These investigate the effects of the PTO damping caused by the power take–off (PTO) system on device performance. The performance is assessed for a range of regular wave heights and periods. The results demonstrate that a PTO system with an intermediate damping can be used for all chambers in the MC–OWC device for most wave period ranges, except for the long wave periods. These require a higher PTO damping. An increased incident wave height reduces the device capture width ratio, but there is a noticeable improvement for long wave periods.     

陕西宁陕—户县地区商丹构造带北侧TTG岩系元素地球化学及其构造意义

陕西宁陕－户县地区商丹构造带北侧发现的花岗质片麻岩为古老侵入体，主要由黑云斜长片麻岩，黑云角闪斜长片麻岩，角闪斜长片磨岩等类型岩石组成，具有TTG岩系的组成特征，元素地球化学特征反映其形成于类似岛弧构造环境。     

川西高原可尔因地区黄土成因研究

川西高原马尔康县境内的可尔因地区黄土分布广泛.黄土主要呈披盖式分布在3~6级阶地上.采用ESR（电子磁旋共振）测年、黄土粒度分析、SEM扫描电镜石英表面形态观察以及区域资料对比,分析了可尔因地区黄土的风成成因,认为应属冰缘黄土.     

The impact of freshwater discharges on the ocean circulation in the Skagerrak/northern North Sea area. Part II: energy analysis

We perform eddy-permitting to eddy-resolving simulations of the Skagerrak/northern North Sea with a terrain-following numerical ocean model. We demonstrate that realistic representations of freshwater input are not required when the focus is on modelling mesoscale structures such as meanders and eddies. To arrive at this conclusion, we analyze the results using a recently developed energy diagnostic scheme to study the sensitivity to realistic representations of the lateral freshwater flux provided to the area from the Baltic Sea and by the major rivers. The scheme is suitable for analysis of growth of instabilities, and it has four basic instability processes prominent. We recognize both horizontal and vertical shear instabilities. There are two processes where average potential energy is converted to eddy kinetic energy, and they are related to the mean gradient in surface elevation and the mean lateral density gradient, respectively. The latter process is known as frontal instability. We demonstrate that the change in the eddy kinetic energy field is small, despite the large variations in the hydrographic properties from experiment to experiment. Moreover, generation of eddy activity appears at the same locations and with approximately the same strength regardless of actual representations of freshwater input. Furthermore, we find that vertical shear instability dominates the energy conversion processes in the Norwegian Coastal Current. Finally, we find that the areas off the northwest coast of Denmark recognized with enhanced eddy kinetic energy level is not caused by instability processes but eddy–eddy interaction rooted in variations in the sea level.     

镇江地质灾害治理工程项目管理中的问题与对策探讨

地质灾害治理工程项目管理是地质灾害管理的具体体现和实施过程,其基本任务是根据地质灾害管理目标和管理方法,组织实施防治工程,保障取得预期的减灾成果。就镇江市地质灾害治理工程项目管理目前现状,从规范文件、招标机构、管理工具、管理经验、干扰因素、风险评价、人员素质等方面进行粗浅分析,并针对存在的问题提出相应的对策,借以提高镇江市地质灾害治理工程项目管理的能力和水平,以便今后地质灾害治理项目管理更好地完善和发展。