道路网约束下的城市兴趣点选取     

郭沛沛  李成名  殷勇  丁圣陶 《测绘科学》2017,42(1)

针对道路对城市内部兴趣点数据分布有密切的约束关系,故城市内POI数据往往呈现出沿着道路分布的特征这一现象,提出一种在道路网约束下城市内部POI数据的选取算法。通过建立道路网的拓扑结构,根据POI数据的分布位置分为道路周边分布的和远离道路分布的两大类,对道路周边的点使用"间苗法"选取,对远离道路分布的点根据其分布模式决定采用"随机法"或其他方法选取。算法采用实际数据进行实验,切实可行,并得到了合理的结果。  相似文献   

相关性的组合预测模型在开采沉陷中的应用     

王金涛  郭广礼  郭庆彪  赵自强  徐孟强  郭凯凯 《测绘科学》2017,42(10)

针对当前开采沉陷不同阶段的单点沉陷变形预计精度不高的问题,该文首次从基于相关性的组合预测模型的思想出发,建立了面向沉陷不同阶段的基于相关系数的组合预测模型。实例验证结果表明,基于相关系数的组合预测模型在开采沉陷预测中的应用克服了单一模型的局限性,能够有效利用不同单一模型的信息,有较高的精度和可信度;能够满足不同阶段的开采沉陷预测,更适用于对沉陷变形数据要求高的场合。  相似文献   

1999年11月29日辽宁岫岩5.4级地震序列的破裂过程研究a   总被引：2，自引：1，他引：2       下载免费PDF全文

陈学忠  盖增喜  周仕勇  郭铁栓  朱令人 《地震学报》2001,24(6):659-662

众所周知 ,对地震破裂过程的研究不仅会深化对地震发生过程的认识 ,同时也有助于攻克地震预测这一世界性科学难题 .对这方面的研究一直受到国内外地震学家的重视 .从 2 0世纪 90年代初 ,他们开始着眼于研究主震发生过程中的主破裂时空过程的研究 .这方面的研究通常是利用数字化地震观测波形资料 ,借助于反演方法 ,反演出地震的震源破裂过程 .通过对地震破裂时空进程成像 ,发现了地震破裂过程的复杂性 .地震破裂不但在空间上是非均匀的 ,而且在时间上也是错综变化的 ,这些成果使我们对地震的发生过程有了更加深入的认识 (Chen etal.,1 996;…  相似文献   

运输地理信息系统中的线性参照系统   总被引：3，自引：0，他引：3  

郭林泉  赵鸿铎  姚祖康 《测绘通报》2001,(7):34-36

介绍了线性参照系统的概念，提出用线参照系统来解决运输管理不同部门间数据共享问题的思想及进一步应用所要解决的问题。  相似文献   

昆明站流动VLBI观测数据处理初步结果   总被引：1，自引：0，他引：1  

贾小林  巨志斌 《测绘科学技术学报》2001,18(2):84-85

对我国自行研制的流动VLBI首次长距离观测数据进行处理,得到了初步结果,并对流动VLBI今后的观测提出了一些建议.  相似文献   

A MATHEMATICAL MODEL FOR UNSTEADY SEDIMENT TRANSPORT IN THE LOWER YELLOW RIVER   总被引：7，自引：0，他引：7  

ZHANG Hongwu  HUANG Yuandong  ZHAO Lianjun Department of Hydraulic Engineering  Tsinghua University  Beijing  China Yellow River Institute of Hydraulic Research  Zhengzhou  China 《国际泥沙研究》2001,16(2)

1 INTRODUCTIONMany mathematical models for sediment transport have been developed for solving practical Problemsin hydraulic engineering. HoweveT, most of them are not able to simulate the hyper-concentratd flows inthe Lower Yellow Xiver because of the extremely high load concentration of the flows. This paper isdevoted tO the simulation of unsteady sediment trallsport in the Lower Yellow mveLIn this paPer, the riverbed deformation equation is modified and the new expressions for sedi…  相似文献   

MODELING OF THE HIGH CONCENTRATION LAYER OF COHESIVE SEDIMENT UNDER THE ACTION OF WAVES AND CURRENTS     

Qinghe ZHANG Yongsheng WU  Jijian LIANand Pingxing DING School of Civil Engineering  Tianjin University  Tianjin  China Dept. Hydraulic Engineering  Tsinghua University  Beijing  China State Key Lab. of Estuarine  Co 《国际泥沙研究》2001,16(2)

MODELING OF THE HIGH CONCENTRATION LAYEROF COIIESIVE SEDMNT UNDER Tus ACTIONOF WAVES AND CURRENTSQinghe ZHANG', Yongsheng WU', Jiian LIAN1 and Pingxing DING3Abstract:High concenhation layer of cohesive sediment frequenhy occurs in muddy estUaries and coastalzones, and causes raPid siltation of the waterways. A one dimensional vertical coupled modeldescribing the interactions betWeen waves, currentS and suspended cohesive sediment is develoPed inthe pre…  相似文献   

EXPERIMENTAL STUDY ON WAVE ENERGY DISSIPATION AND COHESIVE SEDIMENT TRANSPORT IN SILT COAST   总被引：3，自引：0，他引：3  

Shixiong HU  Onyx WAI International Research  Training Center on Erosion  Sedimentation  P.O.Box  Beijing  China. Department of Civil  Structure Engineering  Hong Kong Polytechnic University  Hong Kong  China. 《国际泥沙研究》2001,16(2)

EmmmL STonY ON w^rs EareGY DlsSunnox AunCOIIES1VE SEDonT TRANSPORT 1N SirT COASTShaong HUl and Onyx WAI2Abstract:The interahon betwee the wave and fluld mud laye Plays an twrtan fOle in the develOPmen ofsilt coast. Sediment is essenhally transported in the form of rheological flow of mud laye unds thewave achon, and on the other hand, the fluid Inud layer dams the wave consfory. ms papestUdies the laws of wave energy dissiPation and mud bed deformhon, and the moveInen of…  相似文献   

GRAVEL SLUICING IN ALPINE RUN-OF-RIVER HYDROPOWER PLANTS     

Helmut SCHEUERLEIN Institut flier Wasserbau  Univeristy of Innsbruck  Technikerstn . A- Innsbruck  Austria. 《国际泥沙研究》2001,16(2)

1 INTRODUCTIONNdsral rivers entering reservoirs carry also sediment, partly as bedload and patly in suspension. At theentrance of the reservoir flow velocity is considerably reduced and the capability of sediment transport isdrashcally fading. Bedload maerial is deposited totally at the reservoir entrance fondng a delta, material...in suspension is cAned further intO the reservoir ulh.. it is partly deposited and partly dischargedthrough the dam towards downstreaxn (depending on the trapp…  相似文献   

COMBINED EXPERIMENTAL AND NUMERICAL INVESTIGATION OF FORMULAE FOR EROSION AND DEPOSITION OF COHESIVE SEDIMENTS     

Christoph SCHWEIM Jorn V. PROCHNOW  Jurgen KONGETER Institute of Hydraulic Engineering  Water Resources Management  Aachen University of Technology  Germany. E-Mail: schweim@iww.rwth-aachen.de 《国际泥沙研究》2001,16(2)

1 mTsonvCTIoxTIansport of fine cOhesive sedinds inevitably leads to the develoPment of sediment deposits inreservoirs or zones with small flow velocihes in lowland rivers. Such sediment dePosits often conshtUte aconsiderable ecological danger, as cOhesive sediInnts have the ability to bind POllutants like heavymetals, polycyclic aromatic hydrocrtons or chlorinated hydrocaIbons (F6f8iner, l989). In the case of anextreme hydraUlic event like a flood or a reservoir dePlehon, erosion of cone…  相似文献