Resolution assessment of the three-dimensional acquisition geometry of the Anhui experiment in "Geoscience Yangtze Plan"

According to the actual observation conditions of the Yangtze River valley from Anqing city to Maanshan city, we designed the 3D acquisition geometry, and applied the multi-scale checkerboard semblance analysis to assess the preliminary resolution of the designed observation. The checkerboard semblance tests use the refraction and reflection travel-time simultaneous inversion algorithm to quantitatively provide both resolution assessment of velocity structure and Moho topography. The multi-scale checkerboard semblance recovery results show that while the checkerboard semblance threshold value is 0.5, the preliminary resolution of the designed acquisition geometry is better than 10 km in the upper crust (the depth is less than 10 km), around 15 km in the mid-crust (the depth is 10?25 km), and better than 20 km in the lower crust (the depth is 25?33 km). The preliminary tomographic resolution for the Moho topography is about 20 km in the ray-path coverage area beneath the acquisition geometry. While the checkerboard semblance threshold value is 0.75, the preliminary resolution is 20 km in the upper crust, around 20?25 km in the mid-crust and 25 km in the lower crust. And the preliminary tomographic resolution for the Moho topography is better than 30 km in the ray-path coverage area beneath the acquisition geometry. These non-linear checkerboard tests reveal that the designed acquisition geometry is suitable to image the crustal velocity structure of the Yangtze River valley in the Anhui province.     

甘肃中部黄土丘陵沟壑区农林复合生态系统综合效益评价

在对甘肃中部黄土丘陵沟壑区典型流域农林复合生态系统大面积调查和示范区定点观测的基础上,参考国内外农林复合生态系统综合效益评价的研究成果,采用层次分析法(AHP),对区域内典型农林复合生态系统模式：沙棘一仁用杏一紫花苜蓿复合经营模式(T1)、侧柏一甘蒙柽柳一紫花苜蓿复合经营模式(T2)、甘蒙柽柳一农作物复合经营模式(3)、雨水集流庭院经济复合经营模式(T4)、围栏放养模式(T5),以坡耕地农田生态系统(T6)作为对照,从生态效益、经济效益、社会效益及综合效益方面进行了分析和评价．该研究成果将为甘肃中部黄土丘陵沟壑区水土保持综合治理、退耕还林工程、实现当地农业和林业可持续发展及提高农村社会经济发展水平提供理论依据。     

浅层岩土室内、外热物性测试的相关性

对于浅层岩土热物性参数测试中常用的实验室和现场热响应试验方法,结合上海某工程的实际情况,提出一种基于室内试验的岩土综合热物性参数确定方法。首先,根据室内、外试验测试结果的差异,选取地层厚度、含水率、密度及渗透系数作为影响二者热物性参数测试差异的主要因素,使用层次分析法确定各影响因素的权值,并按权值大小修正室内热物性参数测试结果。然后,分别模拟室外现场热响应试验和修正后的室内热物性参数以及实际地层的传热过程,得出三者在热量传导能力之间的差距分别为1.2%、1.1%及2.3%。最后,提出埋管深度和导热系数的乘积可代表岩土层的换热能力,且计算出修正后的室内热物性参数对应的均一导热系数与现场热响应试验测出的综合导热系数分别为1.832 W/(m·℃)和1.778 W/(m·℃)。     

Subcompositional Patterns in Cenozoic Volcanic Rocks of Hungary

Data selected from an extensive major element database of Cenozoic volcanic rocks (including calc-alkaline andesites, dacites, rhyolites, and alkali basalts) of Hungary are used to illustrate the detection and modeling of subcompositional patterns using a statistical analysis based on the assumption that relative differences between the observed values are more meaningful than absolute ones. In particular, two roughly linear compositional patterns (associated one to the alkaline basalts, the other to the calc-alkaline series) are revealed and evaluated, and it is shown how principal component analysis can be used to obtain the estimated subcomposition of their incidental intersection point.     

基于模糊线性规划的土地整理优化研究

分析研究了模糊线性规划及其对土地整理项目规划的适用性 ,并结合湖北省秭归县土地整理项目实例 ,对模糊线性规划在土地整理项目规划中的应用进行了系统的分析和研究 ,摸索了一套土地整理优化的方法体系 ,为今后的土地整理优化工作提供了有益的参考     

Slingram EMI prospection: Are vertical orientated devices a suitable solution in archaeological and pedological prospection?

Electromagnetic induction (EMI) is one of the geophysical techniques widely used in soil studies, the slingram devices being held horizontally over the soil surface, i.e. with the coils located at the same height above the ground surface. Our study aims assessing the abilities of slingram devices when held vertically. 1D and 3D modelling have been achieved in order to compare the theoretical responses of vertical devices to the horizontal ones. Some comparative surveys were also undertaken in archaeological contexts to confirm the reliability of theoretical conclusions. Both approaches show that vertical slingram devices are suitable for survey and can constitute an alternative to the usual horizontal orientation. We give a table in Appendix A which contains the calibration coefficient allowing transforming of the values given by some of commercially available devices which would be advantageous to use in vertical orientation     

一种改进的区域滑坡危险性评价模型及其应用

区域滑坡危险性评价方法还存在许多需要完善和改进的地方。以工程地质类比法为基础,用滑坡的面密度表示滑坡发生的危险性大小,基于线性代数中QR分解理论,提出了一种用高次多项式拟合致险因子与滑坡危险性间关系的算法,并把该算法与层次分析法模型、条件概率模型相融合,建立了一种改进的区域滑坡危险性评价模型。然后,通过在Visual Studio.Net C#环境下借助ArcEngine组件的二次开发实现了该模型。最后选取陕西省麟游县为实验区域,利用上述模型进行了滑坡危险性评价。经实际资料检验表明,该模型具有较高的可信度,可应用于今后的滑坡危险性区域评价工作中。     

基于层次分析法的玉溪市建设用地集约利用研究

随着工业化和城市化的迅速发展,土地问题已成为制约玉溪市发展的关键因素。在分析玉溪市土地利用现状的基础上,运用层次分析法,从影响城市建设用地土地利用的因素出发,选择5个准则层建立了适合玉溪市城市建设用地集约利用的评价指标体系。对玉溪市2009年的建设用地集约利用分值进行了计算,结果表明玉溪市各县区土地集约利用不平衡,且各县区差异较大,并在分析评价结果的基础上提出了实现玉溪市建设用地集约利用的建议。     

Rapid geometry analysis for earthquake-induced and rainfall-induced landslide dams in Taiwan

Stability analysis of the dam is important for disaster prevention and reduction. The dam＇s geometry plays an important role in understanding its stability. This study develops a rapid landslide dam geometry assessment method for both earthquake-induced and rainfall-induced landslide dams based on nine real cases collected in Chinese Taipei and 214 cases collected worldwide. For simplification purposes, a landslide dam is classified into triangular or trapezoidal. The rapid landslide dam geometry assessment method in this paper uses only satellite maps and the topographic maps to get landslide area, and then analyze the dam geometry. These maps are used to evaluate the area of the landslide and the slope of the river bed. Based on the evaluation information, the proposed method can calculate dam height, the length of the dam, and the angles of the dam in both upstream and downstream directions. These geometry parameters of a landslide dam provide important information for further dam stability analysis. The proposed methodology is applied to a real landslide dam case at Hsiaolin Village. The result shows that the proposed method can be used to assess the landslide dam geometry.