The Selection of Field Acquisition Parameters for Dispersion Images from Multichannel Surface Wave Data

The accuracy and resolution of surface wave dispersion results depend on the parameters used for acquiring data in the field. The optimized field parameters for acquiring multichannel analysis of surface wave (MASW) dispersion images can be determined if preliminary information on the phase velocity range and interface depth is available. In a case study on a fill slope in Hong Kong, the optimal acquisition parameters were first determined from a preliminary seismic survey prior to a MASW survey. Field tests using different sets of receiver distances and array lengths showed that the most consistent and useful dispersion images were obtained from the optimal acquisition parameters predicted. The inverted S-wave velocities from the dispersion curve obtained at the optimal offset distance range also agreed with those obtained by using direct refraction survey.     

地理信息工程多指标综合评价方法的选择研究

讨论了在地理信息工程建设中引入综合评价方法,介绍了多指标综合评价方法的概念与特性,阐述并比较了地理信息工程建设中可应用的综合评价方法。     

A vector‐valued ground motion intensity measure consisting of spectral acceleration and epsilon

The ‘strength’ of an earthquake ground motion is often quantified by an Intensity Measure (IM), such as peak ground acceleration or spectral acceleration at a given period. This IM is used to predict the response of a structure. In this paper an intensity measure consisting of two parameters, spectral acceleration and epsilon, is considered. The IM is termed a vector‐valued IM, as opposed to the single parameter, or scalar, IMs that are traditionally used. Epsilon (defined as a measure of the difference between the spectral acceleration of a record and the mean of a ground motion prediction equation at the given period) is found to have significant ability to predict structural response. It is shown that epsilon is an indicator of spectral shape, explaining why it is related to structural response. By incorporating this vector‐valued IM with a vector‐valued ground motion hazard, we can predict the mean annual frequency of exceeding a given value of maximum interstory drift ratio, or other such response measure. It is shown that neglecting the effect of epsilon when computing this drift hazard curve leads to conservative estimates of the response of the structure. These observations should perhaps affect record selection in the future. Copyright © 2005 John Wiley & Sons, Ltd.     

西藏墨脱公路工程地质灾害遥感勘察与解译方法

在地处南迦巴瓦峰地区的西藏墨脱公路工程地质遥感勘察中，以Landsat-7 ETM＋卫星影像为信息源，运用彩色合成、数据融合、主成分分析等数字图像处理方法，结合基于地学知识的图像识别及解译技术，对墨脱公路沿线的泥石流、滑坡、活动断裂等地质灾害进行全面解译分析及专题制图，查明了公路方案线区域内活动断裂发育特征。其中，帕隆藏布断裂带、岗日嘎布断裂带等对错拉隧道将产生较大影响。大型滑坡主要有5个，沿南迦巴瓦峰南坡的雅鲁藏布江河谷两岸发育，分布在仓孔、墨脱及洒拉库等地。泥石流、崩塌广泛发育，主要分布在雅鲁藏布江河谷、帕隆藏布河谷沿线的派、拉格-汗密、岗乡-波密一带。勘察及解译结果为墨脱公路工程线路方案选择、工程地质条件评价提供了充分的科学依据。     

Site selection for hazardous wastes: A case study from the GAP area, Turkey

The increase in the popularity of using environmental design criteria in town and country planning has brought about the need to fully identify the principles to determine the best location of hazardous wastes to be landfilled. This environmental management issue has received considerable attention because of its applications in urban and rural infrastructure planning, industrial development planning as well as health, housing, transportation and agricultural schemes. This paper explains a method to determine how to locate suitable sites for hazardous waste landfilling area by using the site screening study. It demonstrates how the criteria such as geology, topography, land use, climate, earthquake and other related factors can be introduced into the overlayer technique to determine the suitable site selection in a region. The research was undertaken in the Southeastern Anatolia Project (known as GAP in Turkey) region where identifying the land resources is crucial for agricultural and water management purposes. The paper also explains the validity of the method employed on the site selection process for hazardous wastes. The introduced method may enable more accurate design procedure for planning in environmental management in future.     

龙永煤田昌福山区地质勘探工作探讨

通过对福建省永定县昌福山勘探区的构造及煤层进行对比分析,认为该区的勘探类型为三类二型.在分析该勘探类型的勘探阶段划分、勘探手段选择的基础上,对其各勘探阶段工程量进行了最合理布置.经过多年的勘查实践证明,本区选择的勘查方法合理正确,所提交的详终报告获一次性评审通过.希望对该类型勘查区的勘查工程布置有一定的参考意义.     

航磁资料在大-瑞铁路选线中的应用

大理至瑞丽铁路处于青藏高原和云贵高原的结合部,区内地质构造复杂.利用航磁资料,研究了该区的地质构造特征,特别是结合地质资料划分出断裂81条,新发现48条,其中与大-瑞铁路推荐方案有关的断裂18条,涉及到的地段有21处.这些断裂的发现,为选线工作提供了重要的基础资料.     

《中学地理复习考试地图册》的选题策划与实施

在当前图书市场竞争十分激烈的态势下,科学地策划选题显得尤为重要。本文以《中学地理复习考试地图册》为例,从选题的确立、精心编制和培育市场等几个方面论述了出版社应如何发挥优势、明确定位、抓住机遇、树立品牌,以创造效益。     

GIS在空间选址中的应用现状分析

空间选址问题涉及因素错综复杂，模型建立困难，GIS的发展为空间选址问题提供了新的技术手段，其应用于空间选址可以克服以往一些模型的不足之处，具有广阔的应用前景。本文主要对影响空间选址的因素进行了归纳总结，并对GIS技术在空间选址中的应用现状进行了一定的探讨分析。