数字地震分析软件WSGNPLOT的改进与应用     

聂万里  王文景  刘贤伦  周辉生  高丽  上官文明 《高原地震》2009,21(4):46-52

利用MATLAB语言结合DK-1仪器的工作特性设计滤波器,并且利用DIMAS中WSGNPLOT地震分析软件运用到实际工作中,解决WGSNPLOT软件中长周期滤波器近震分析结果不理想的问题。提高近震的分析质量,并且对这个滤波器的工作特性进行对比分析。  相似文献   

A method for choice of optimum scale on land use monitoring in Tarim River Basin     

ZHAO Jin  CHEN Xi  BAO Anming  ZHANG Chao  SHI Wanli 《地理学报》2009,19(3):340-350

Optimal scale is one of the important issues in ecology and geography. Based on land-use data of the Tarim River Basin in Xinjiang of China in the 1950s, regarding the area of land use types as the parameter in scale selecting, the histograms of the patches in area are charted. Then, by reinforcing the normalized scale variances (NSV) with 3 landscape indices, the scale characteristics of land use in the Tarim River Basin can be summarized. (1) NSV in the Tarim River up to a maximum at scale of 1:50,000 which is considered appropriate for the Tarim River. (2) Diversity indices of saline land are consistent with NSV’s. Diversity indices and NSV of sandy land showed that the appropriate scale is in the same scale domain. There is a significant difference between diversity indices and NSV of forestland and shrubland. (3) Fractal dimension of sandy land and saline land showed a hierarchical structure at a scale of 1:10,000. Fractal dimension of forestland and shrubland are distributed under the same hierarchical structure in the region.  相似文献   

承德地震前兆台网数据跟踪分析     

任俊峰  郭亚亚  焦成丽  孙澎涛  李万里  王嘉琦 《地震地磁观测与研究》2018,40(1):79-84

简要介绍承德地震前兆台网2014-2017年数据跟踪分析工作,对常见典型干扰事件进行分类统计,分析影响制约承德前兆台网观测数据质量的主要因素,为进一步提高数据分析能力与观测资料质量提供有效的技术参考及应对措施。  相似文献   

辽宁沿海经济带融入"一带一路"的路径探析          下载免费PDF全文

冯多  赵万里 《海洋开发与管理》2020,37(8):38-42

为充分把握“一带一路”建设契机,加快我国东北地区海洋经济发展,文章对辽宁沿海经济带融入“一带一路”的路径进行分析。研究结果表明：辽宁沿海经济带在地缘区位、海洋产业基础、港口物流设施和对外贸易等方面具有优势条件,但在区域联动发展、海洋产业结构转型和技术创新、海洋开发利用方式和海洋资源配置等方面存在不足;未来应进一步激发海洋资源新动能、推动陆海统筹与区域联动发展、创新跨境海洋合作机制、推动海洋产业开发与合作以及推进跨境海洋经济合作区建设。  相似文献   

福建东圳库区淹没及水土流失的3D-VRGIS构建与应用     

江辉仙  林广发  张文开  黄万里 《地球信息科学学报》2008,10(1):39-44

本文应用VRGIS(Virtual Reality Geographical Information System)技术,建立水库工程水土流失三维可视化动态仿真模型,实现库区的空间信息可视化。以福建省东圳水库为研究对象,建立水土流失区域三维虚拟地理信息系统(3D-VRGIS),生成水土流失现状以及库区生态环境三维场景。并结合水土流失中水淹分析要素与三维空间的数据可视化技术,实现水土流失监测预报及其区域定位监控的可视化处理,为减少水土流失危害,提供可靠的信息资源。  相似文献   

基于ArcGIS的风暴潮灾害疏散系统的研究与开发——以海南省临高县为例     

王建军  吴北平  朱万里  赖祖龙  符永好 《测绘通报》2013,(9):91-94

以ArcGIS系列软件作为开发平台,Visual Studio作为编程环境,利用面向对象的Visual Basic编程语言,采用B/S模式,开发出风暴潮灾害疏散系统。并利用2011年第17号台风"纳沙"风暴潮增水数据作为研究数据,对系统进行验证。  相似文献   

Numerical Simulation of Fluxes Generated by Inhomogeneities of the Underlying Surface over the Jinta Oasisin Northwestern China     

LI Wanli  LU Shihu  FU Shenming  MENG Xianhong  H. C. NNAMCHI 《大气科学进展》2011,28(4):887-906

Using land-use types derived from satellite remote sensing data collected by the EOS Moderate Resolution Imaging Spectroradiometer (EOS/MODIS), the mesoscale and turbulent fluxes generated by inhomogeneities of the underlying surface over the Jinta Oasis, northwestern China, were simulated using the Regional Atmospheric Modeling System (RAMS4.4). The results indicate that mesoscale circulation generated by land-surface inhomogeneities over the Jinta Oasis is more important than turbulence. Vertical heat fluxes and water vapor are transported to higher levels by mesoscale circulation. Mesoscale circulation also produces mesoscale synoptic systems and prevents water vapor over the oasis from running off. Mesoscale circulation transports moisture to higher atmospheric levels as the land-surface moisture over the oasis increases, favoring the formation of clouds, which sometimes leads to rainfall. Large-scale wind speed has a significant impact on mesoscale heat fluxes. During the active phase of mesoscale circulation, the stronger large-scale winds are associated with small mesoscale fluxes; however, background wind seems to intensify the turbulent sensible heat flux and turbulent latent heat flux. If the area of oasis is enlarged properly, mesoscale circulation will be able to transport moisture to higher levels, favoring the formation of rainfall in the oasis and protecting its "cold island" effect. The impact of irrigation on rainfall is important, and increasing irrigation across the oasis is necessary to protect the oasis.  相似文献   

整数相位钟法精密单点定位模糊度固定模型及效果分析   总被引：1，自引：1，他引：0  

刘帅  孙付平  郝万亮  刘婧  李海峰 《测绘学报》2014,43(12):1230-1237

精密单点定位(PPP)模糊度固定方法有3种:星间单差法、整数相位钟法和钟差解耦法,但目前仅法国CNES公开发布用于整数相位钟法PPP模糊度固定的产品,因此研究基于整数相位钟法的用户端PPP模糊度固定模型很有必要.本文分析了整数相位钟法PPP模糊度固定模型,着重指出该模型与传统浮点解PPP模型的区别;提出一种顾及质量控制的逐级模糊度固定策略用于具体实施PPP模糊度固定.大量动态PPP解算试验表明:与浮点解PPP相比,固定解PPP具有更快的收敛速度且定位精度和稳定性更好.  相似文献   

Charge structure of a summer thunderstorm in North China: Simulation using a Regional Atmospheric Model System   总被引：3，自引：0，他引：3  

Dongxia Liu  Xiushu Qie  Liang Peng  Wanli Li 《大气科学进展》2014,31(5):1022-1034

Electrification and simple discharge schemes are coupled into a 3D Regional Atmospheric Model System （RAMS） as microphysical parameterizations, in accordance with electrical experiment results. The dynamics, microphysics, and electrifi- cation components are fully integrated into the RAMS model, and the inductive and non-inductive electrification mechanisms are considered in the charging process. The results indicate that the thunderstorm mainly had a normal tripole charge structure. The simulated charge structure and lightning frequency are basically consistent with observations of the lightning radiation source distribution. The non-inductive charging mechanism contributed to the electrification during the whole lifetime of the thunderstorm, while the inductive electrification mechanism played a significant role in the development period and the mature stage when the electric field reached a large value. The charge structure in the convective region and the rearward region are analyzed, showing that the charge density in the convective region was double that in the rearward region.  相似文献   

Experimental Study of Ultrasonic Waves Propagating Through a Rock Mass with a Single Joint and Multiple Parallel Joints   总被引：2，自引：1，他引：1  

Xiaolin Huang  Shengwen Qi  Songfeng Guo  Wanli Dong 《Rock Mechanics and Rock Engineering》2014,47(2):549-559

Experiments were conducted to study the relationship between the transmission ratio (TR) and normal stress, joint roughness, joint number and frequency of incident waves, respectively, when ultrasonic waves pass across a rock mass with one joint and multiple parallel joints oriented normally. The ultrasonic waves were generated and received by pairs of piezoelectric transducers and recorded by an ultrasonic detector. The specimens were subjected to normal stress by a hydraulic jack and loading frame. The jointed rock mass was produced by superposing rock blocks in the study. Rough joints were produced by grooving notches on the planar joints formed by sawing directly. In the case of multiple parallel joints, the overall thickness of specimens was maintained while the joint number changed. Three pairs of P-wave transducers and one pair of S-wave transducers with different frequencies were, respectively, applied and all transducers emitted signals perpendicular to the joints in the experiment. The results indicate that TR increases with increasing normal stress while the increment rate decreases gradually. This is particularly so when the normal stress is high enough that TR will approximate 1 even if the rock mass has many joints. In addition, the experiments indicate that the higher the wave’s frequency, the lower its TR, and this phenomenon is gradually reduced as the normal stress increases. In response to S-waves, TR increases with increase in joint roughness; however, in response to P-waves, TR decreases gradually with increase in joint roughness. For multiple parallel joints in a fixed thickness rock mass with normally incident P-waves, TR does not always decrease with increase in the number of joints, and there is a threshold joint spacing for a certain incident wave: when the joint spacing is smaller than the threshold value, TR will increase with a decrease in joint spacing. The experimental results support similar conclusions based on analytical results drawn by Cai and Zhao (Int J Rock Mech Min Sci 37(4):661–682, 2000), Zhao et al. (Int J Rock Mech Min Sci 43(5):776–788, 2006b) and Zhu et al. (J Appl Geophys 73:283–288, 2011a).  相似文献