基于飞机场特殊高边坡填筑施工放样   总被引：1，自引：1，他引：0  

田大明 《北京测绘》2011,(1):70-72,62

填筑的高边坡不平行于飞机杨跑道纵轴线,由于有两个坡比,给施工放样样找点带来困难.建立空间平面方程,计算坡顶线的法向线坡比,编程计算施工放样,这种方法的效果是较明显的,工作简单、便捷、高效,放样数据计数准确、可靠.  相似文献   

数字近景摄影测量在高速公路边坡物理模型变形测量中的应用   总被引：1，自引：0，他引：1  

李欣  李树文  王树根  任伟中 《测绘科学》2011,36(5):209-210,233

高速公路边坡是高速公路设计和建设中一个重要的组成部分,其稳定性对道路交通的安全运行及公路沿线地区人民的生命财产安全起着至关重要的作用.本文在分析目前岩土工程物理模型变形测量方法的基础上,将数字近景摄影测量技术应用于某高速公路边坡模型的变形测量中,所测位移场规律与试验中出现的现象一致,测量精度能够满足模型变形测量的要求,...  相似文献   

山区地表太阳辐照度随时空变化的模拟分析     

秦慧平  易维宁  黄红莲  潘邦龙 《武汉大学学报(信息科学版)》2011,(7)

在光学遥感数据的应用过程中,地表太阳辐照度的量化问题对于遥感数据的获取和地表地物特性的反演等工作都是一个非常重要的环节,而地表太阳辐照度的定量计算又依赖于辐射源、目标物和传感器三者之间的几何关系以及目标地物的地表特征。利用山区地表太阳辐照度的计算模型,对不同时间、不同山区地形下的地表太阳辐照度进行了定量模拟,用三维图的方式分析了地表太阳辐照度随时间、地形坡度、坡向的变化规律,为光学遥感中地表太阳辐照度随时空变化的量化关系分析提供了更直观的依据。  相似文献   

基于地磁共生矩阵的水下地磁导航适配区选择   总被引：1，自引：1，他引：0  

赵建虎  王胜平  王爱学 《武汉大学学报(信息科学版)》2011,(4):446-449

提出了一种基于地磁共生矩阵的地磁适配区选择算法。通过对地磁共生矩阵反演出的地磁角二阶矩、地磁对比度、相关性、熵以及逆差矩参数的分析,确定了地磁适配区所对应的截止阈值,并验证了该方法的可行性。  相似文献   

Controls on slope‐to‐channel fine sediment connectivity in a largely ice‐free valley,Hoophorn Stream,Southern Alps,New Zealand     

Casey R. Beel  John F. Orwin  Peter G. Holland 《地球表面变化过程与地形》2011,36(7):981-994

There has been little work to date into the controls on slope‐to‐channel fine sediment connectivity in alpine environments largely ice‐free for most of the Holocene. Characterization of these controls can be expected to result in better understanding of how landscapes “relax” from such perturbations as climate shock. We monitored fine sediment mobilization on a slope segment hydrologically connected to a stream in the largely ice‐free 8·3 km² Hoophorn Valley, New Zealand. Gerlach traps were installed in ephemeral slope channels to trap surficial material mobilized during rainfall events. Channel sediment flux was measured using turbidimeters above and below the connected slope, and hysteresis patterns in discharge‐suspended sediment concentrations were used to determine sediment sources. Over the 96 day measurement period, sediment mobilization from the slope segment was limited to rainfall events, with increasingly larger particles trapped as event magnitude increased. Less than 1% of the mass of particles collected during these events was fine sediment. During this period, 714 t of suspended sediment was transported through the lower gauging station, 60% of it during rainfall events. Channel sediment transfer patterns during these events were dominated by clockwise hysteresis, interpreted as remobilization of nearby in‐channel sources, further suggesting limited input of fine sediment from slopes in the lower valley. Strong counterclockwise hysteresis, representing input of fine sediment from slope segments, was restricted to the largest storm event (JD2 2009) when surfaces in the upper basin were activated. The results indicate that the slopes of the lower Hoophorn catchment are no longer functioning as sources of fine sediment, but rather as sources of coarse material, with flux rates controlled by the intensity and duration of rainfall events. Although speculative, these findings suggest a shift to a coarse sediment dominated slope‐to‐channel transfer system as the influence of pre‐Holocene glacial erosion declines. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Use of magnetic measures to assess soil redistribution following deforestation in hilly region   总被引：1，自引：0，他引：1  

Parisa Mokhtari Karchegani  Shamsollah Ayoubi  Sheng Gao Lu  Naser Honarju 《Journal of Applied Geophysics》2011,75(2):227-236

Limited information is available about the use of magnetic susceptibility property to determine soil redistribution in hilly areas of the semi-arid regions. This study was conducted to evaluate the use of magnetic properties to determine soil redistribution along a hill slope following deforestation. The study area is located in the Quaternary hilly region of Lordegan district in west Iran. Ten transects were established in two land uses that included natural Querqus forested and cultivated lands. Soil samples were collected at different positions along the slope and magnetic properties (χlf, χhf, SIRM, ARM, and χfd) and selected physico-chemical properties were determined. The results (based on the χfd, SIRM/ARM) showed that the magnetic susceptibly in the calcareous materials is pre-dominantly derived during the pedogenic processes and the superparamagnetic particles which were transported to lower positions of hill slope following deforestation. The results confirmed that this methodology could be applied for monitoring soil redistribution along the slope in calcareous hilly areas in the semi-arid regions.  相似文献   

强震作用下层状岩质斜坡破坏的大型振动台试验研究   总被引：1，自引：1，他引：0  

邹威  许强  刘汉香  陈龙  王龙 《地震工程与工程振动》2011,31(4):143-149

以“5.12”汶川地震背景为基础,对不同岩性组合水平层状岩质边坡进行了大型振动台模型试验研究.文中介绍了振动台试验过程,通过对试验现象的观察处理分析,考察了边坡的破坏现象特征、变形破坏模式.实验结果表明,地震力作用下边坡的变形破坏程度、特征以及稳定性不仅与地震波的类型、加载方向、频率、振幅有关,同时还受边坡的岩体性质、...  相似文献   

基于有限元重度增加法计算边坡稳定系数   总被引：1，自引：0，他引：1  

柏亚双  张文圣  朱德滨  徐国林  夏冰华 《世界地震工程》2011,27(3)

近年来,有限元分析方法在边坡稳定分析中的应用日益广泛,其具体方法分为强度折减法与重度增加法。与强度折减法相比,重度增加法在边坡平缓或者土体摩擦角较大时,很难得到边坡的稳定系数。文中对重度增加法进行改进,采用调整重度增加法的土体剪切屈服强度进行边坡稳定性分析,通过算例对比改进后方法与强度折减法计算得到稳定系数差别。进一步进行了实际工程算例分析,并与规范方法计算结果进行对比,验证文中方法在实际工程应用中具有可行性。  相似文献   

三维激光扫描技术应用于边坡位移监测     

邢正全  邓喀中 《地理空间信息》2011,9(1):68-70

对地面三维激光扫描技术进行了简要介绍,将Trimble GX 3D激光扫描系统应用于边坡位移监测,并利用其配套的realworks survey数据处理软件对采集的数据进行处理,得出结果.  相似文献   

GPS-RTK与测深技术在水下地形测量中的应用     

朱立辉  胡琴 《测绘与空间地理信息》2011,34(5):162-164,167

简要介绍了利用GPS-RTK与测深技术测定水下地形的基本原理和水下地形测量的基本作业步骤,并通过工程实例说明无验潮和传统验潮两种模式下取得的水深测量数据均能满足相关规范要求。  相似文献