勘探线剖面图从二维转化为三维算法

用勘探线剖面图结合钻井与其他资料进行地质模型三维重建是三维地质建模的重要方法。其中勘探线剖面图从二维坐标系向三维坐标系的转换是三维建模的一个重要环节。针对当前勘探线剖面坐标转换过程中勘探线上钻孔并不总是布置在一条直线上(弯折勘探线)的特点,该文提出了一种构建弯折三维剖面的方法。该方法首先由剖面线的起点、终点以及勘探线上钻孔孔口点作为转折点构建三维折勘探线剖面框架;然后将二维剖面图上分段转换剖面上要素点的二维坐标到三维空间,并对跨越剖面转折点的长边添加转折控制点;最后以青海某煤田勘探区的二维勘探线剖面图数据为例,利用该勘探线剖面坐标转换算法,实现了二维勘探线剖面图到三维勘探线剖面图的转化,结果表明三维剖面上保持了原二维剖面所表达的地质模型的几何形态。     

关于国土资源“一张图”建设的思考

国土资源＂一张图＂建设作为国土资源信息＂十二五＂的重要工作,目前正在全国各级国土资源管理部门中如火如荼的开展,但对于国土资源＂一张图＂的定义和建设方法,全国并无统一的界定和设计,本文在对目前全国各地国土资源＂一张图＂建设进行综合分析的基础上,提出了作者自己关于国土资源＂一张图＂建设的思考。     

重庆市国土房管行业数据中心建设

本文介绍了在大集中管理模式下的重庆市国土资源和房屋管理行业数据中心建设,分别就网络系统、主机系统、数据库系统、存储系统、安全建设和日常运行监控进行了介绍,重点对主机虚拟化、应用虚拟化、数据库镜像同步等技术在重庆市国土房管行业数据中心的应用进行了介绍。     

两种区域电离层拟合模型比较研究

建立了单基准站和多基准站的三角级数模型和多项式模型,设计了利用邻近站数据进行两种模型内外符合精度检验的方法,分析了两种模型在精度方面的差异。     

Early Cretaceous exhumation of the Qiangtang Terrane during collision with the Lhasa Terrane,Central Tibet

The timing of the closure of the Bangong Ocean between the Lhasa and South Qiangtang Terranes in central Tibet and the resulting crustal thickening are still under debate. We integrate published apatite fission track and (U–Th)/He thermochronometer data with new zircon (U–Th)/He ages from eight samples and with structural profiles to document that the South Qiangtang Terrane experienced slow exhumation between 200 and 150 Ma, associated with the opening of the Bangong Ocean. Accelerated exhumation (around 0.2–0.3 mm/a) of the South Qiangtang Terrane was initiated at around 150 Ma. This exhumation event is interpreted to reflect collision between the Lhasa and South Qiangtang Terranes after closure of the Bangong Ocean, associated with crustal thickening via thick‐skinned folding and thrusting within the South Qiangtang Terrane. The amalgamation of the Lhasa and South Qiangtang Terranes recorded here may represent the first stage of crustal thickening in the central Tibetan Plateau.     

Research on the Seismic Wave Characteristics of Low Frequency Signals before the Alxa Left Banner MS5.8 Earthquake in Inner Mongolia, China

In order to search for the seismic wave characteristics of low frequency signals in the Alxa Left Banner region,Inner Mongolia,the low frequency signals of seismic wave data are extracted from the earthquakes of MS5. 8 in 2015 and MS5. 0 in 2016 in this area. The results show that:① Before the MS5. 8 earthquake,the seismic stations located near the epicenter in Wuhai,Dongshengmiao,and Shizuishan recorded seismic waves that showed the phenomenon of spectrum shift from high to low frequency.② The low frequency signals recorded by different stations have obvious difference.③ According to the data recorded by the station closest to the epicenter,low-frequency signals were recorded about120 hours before the earthquake and had obvious anomalies. This may reflect slow slip before the earthquake.     

Evidence for strengthening of the tropical Pacific Ocean surface wind speed during 1979–2001

Using multiple surface wind speed (SWS) data sets and trend empirical orthogonal function analysis, we have explored the trend in SWS associated with the large-scale tropical Pacific atmospheric circulation for the period 1979–2001. The present research provides a robust evidence of strengthening of the tropical Pacific Ocean SWS during this period and the magnitude is generally in line with the finding of Wentz et al. The strengthening in SWS is closely associated with the so-called La Ni?a-like sea surface temperature (SST) trend pattern rather than the changes in the ENSO, ENSO Modoki, or PDO. The present results, together with those from some recent climate model simulations, suggest that global warming forcing may have caused an intensification of SWS in the tropical Pacific Ocean by inducing the La Ni?a-like SST trend pattern due to ocean dynamics. Meanwhile, the strengthening in the tropical Pacific Ocean surface trade winds may also feedback to enhance the La Ni?a-like SST trend pattern under the positive wind-upwelling dynamic feedback mechanism.     

安徽巢湖凤凰山石炭系黄龙组红色灰岩矿物地球化学特征

安徽巢湖凤凰山晚石炭世黄龙组的地层主体为肉红色生物屑微晶灰岩,顶部为夹灰岩条带的泥岩。矿物学分析显 示,肉红色生物屑微晶灰岩的矿物主要为方解石,含少量针铁矿和赤铁矿。漫反射光谱分析表明,常用的古气候指标“红 度”与灰岩中铁氧化物、氢氧化物的光谱强度具显著的正相关性,而与岩石的全铁含量相关性较低,据此推测铁的氧化物 和氢氧化物是灰岩呈肉红色的重要原因。元素地球化学分析结果显示,黄龙组灰岩相对富Fe,Mn,而贫Co,Ni,在 Al-Fe-Mn,Fe-Mn-(Cu+Co+Ni)以及Cu-Pb-Zn三角判别图上,均靠近或落入热液成因区。综合地球化学特征与前人研究成 果,该文认为巢湖凤凰山黄龙组肉红色灰岩的形成很可能受到海底热液活动的影响。     

A fluidized landslide on a natural slope by artificial rainfall

An experiment to induce a fluidized landslide by artificial rainfall was conducted on a natural slope at Mt. Kaba-san in the village of Yamato, Ibaraki Prefecture, Japan. The experimental slope was 30 m long, 5 m wide, and the average slope gradient was 33°. A landslide initiated 24,627.5 s (410 m/27.5 s) after the start of sprinkling at a rainfall intensity of 78 mm/h. The landslide mass was 14 m long and 1.2 m deep (at maximum). It first slid, then fluidized, and changed into a debris flow. The travel distance was up to 50 m in 17s. The apparent friction angle of the fluidized landslide was 16.7°. Formation of the sliding surface was detected by soil-strain probes. Motion of the surface of the failed landslide mass was determined by stereo photogrammetry.     

赤潮藻类非线性动力学模型的随机分岔

选取典型赤潮藻类的硅藻和甲藻,建立了一个随机非线性动力学模型,运用随机平均法结合现代非线性动力学理论对模型进行了化简,运用拟不可积 Hamilton 系统的相关理论和 Oseledec 乘性遍历定理求解了模型的最大 Lyapunov 指数,得到了模型随机稳定性的条件;利用动态系统不变测度的 Lyapunov 指数分析了模型的随机分岔,得到了系统发生随机D-分岔时参数的取值条件,结果表明,系统在随机因素作用下变得更敏感、更不稳定.