基于GIS的岩溶水资源量均衡法评价模块的构建     

纪轶群  郭高轩  李文忠  沈媛媛  许亮  南英华  陆海燕 《城市地质》2014,(4):46-51

为了支持北京市岩溶水资源量准确、高效计算,使用均衡法构建区域水资源量计算模块。模块设计以Arc GIS平台为依托,使用C/S模式来构建,模块数据库由空间数据库、属性数据库、影像数据库、元数据库组成。模块主要功能包括：补给量计算、排泄量计算、储存变化量计算、可开采量评价、资源量评价结果专题图制作功能等。经岩溶区试算,证明评价模块的构建为北京岩溶水资源量的准确、高效计算和成果的可视化提供重要的信息技术支持。  相似文献   

碎石桩复合地基现场试验及数值模拟分析          下载免费PDF全文

许崇华 《江苏地质》2013,37(4):668-674

依托某储油罐的碎石桩复合地基处理实例,进行了复合地基现场变形、荷载传递及固结速率的长期监测。参照工程实际建立了碎石桩复合地基三维有限元水土耦合分析模型,讨论了碎石桩桩长以及复合地基置换率对碎石桩复合地基工程性状的影响。监测结果和有限元数值分析结果表明：碎石桩复合地基对于沉降和水平位移的控制效果较好,保证了施工过程中地基的稳定性;随着上部荷载的增加,桩土应力比逐渐增大。碎石桩给地基提供了良好的排水通道,有效加快了地基的固结速率;碎石桩复合地基沉降随着桩长和置换率的增加而减小,但达到一定程度时,置换率和桩长对沉降的减少效果有限;复合地基桩土应力比随着桩长的增加而增大,随着置换率的增大而减小;置换率和桩长的增加都能加快碎石桩复合地基的固结速率,但是置换率对固结速率的影响更大一些。  相似文献   

对新生界复杂地层钻进技术的几点认识     

苏剑华 《中国煤田地质》2002,14(3):75-76

针对煤田地层钻进中钻遇复杂地层特别是新生界地层时涉及的几点技术问题进行了探讨。通过试验提出了复杂地层钻进中小孔径的优点、地层压力平衡的重要性以及冲积层钻进需注意的几个要点,重点对第三纪造浆地层的造浆原因和泥浆性能的优化处理进行了分析,总结了钻进过程中应对不同性质和成分的地层采用不同的处理方法。  相似文献   

Subsidenz und tektonik des Saar-Nahe-Beckens (SW-Deutschland)     

Andreas Henk 《International Journal of Earth Sciences》1993,82(1):3-19

The Saar-Nahe-Basin in SW-Germany is one of the largest Permo-Carboniferous basins in the internal zone of the Variscides. Its evolution is closely related to movements along the Hunsrück Boundary Fault, which separates the Rhenohercynian and the Saxothuringian zones. Recent deep seismic surveys indicate that the Saar-Nahe-Basin formed in the hanging wall of a major detachment which soles out at lower crustal levels at about 16 km depth. Oblique extension along an inverted Variscan thrust resulted in the formation of a half-graben, within more than 8 km of entirely continental strata accumulated. The structural style within the basin is characterized by normal faults parallel to the basin axis and orthogonal transfer fault zones. Balanced cross-section construction and subsidence analysis indicate extension of the orogenically thickened lithosphere by 35%. Subsidence modeling shows discontinuous depth-dependent extension with laterally varying extension factors for crust and mantle lithosphere. Thus, the offset between maximum rift and thermal subsidence can be explained by a zone of mantle extension shifted laterally with respect to the zone of maximum crustal extension.

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NUTRIENT LOAD ESTIMATION METHODS FOR RIVERS   总被引：2，自引：0，他引：2  

Huai-en LI. Joseph Hun-Wei LEE  Ming CM Professor  Environmental Science Institute  Xi''''an University of Technology. Xi''''an . Shaanxi  P.R. China.Professor  Department of Civil Engineering  The University of Hong Kong  Pokfulam Road  Hong Kong.P.R. China  Ph.D. student in Hydrology  Water Resources. Environmental Science Institute  Xi''''an University ofTechnology  Xi''''an  Shaanxi  P.R. China 《国际泥沙研究》2003,18(4)

Pollutant load estimation is essential for watershed management and water pollution control. For most watersheds, only sparse water quality measurements (e.g. monthly data) are available. The influence of input data on the accuracy of non-point source pollution load estimation is studied using the water quality and stream flow data from a small watershed in Hong Kong. Comparison and analysis of the results using 8 different methods show that the accuracy of stream-flow runoff is the single most important factor for the calculation of pollutant load. Based on the results, the stream flow correction coefficient is advanced to provide a more reliable load estimation. The improved method of pollutant load estimation can be easily applied in practice since the stream-flow runoff can be measured by hydrological station or estimated with various hydrological methods.  相似文献   

高炉炉渣堆积场建筑稳定性研究     

曹华  杨晓祥 《云南地质》2002,21(1):94-99

本项目为国内首例对钢渣堆积体的工程力学性质，稳定性及建筑性能诸方面，采用以现场原位测试工程物探为主要手段，进行试验，研究，评估。  相似文献   

十堰台数字化水管仪倾斜潮汐观测质量评定   总被引：1，自引：0，他引：1  

孙伶俐  罗俊秋  吕品姬  郭熙枝  李明  赵凌云  陈红波 《大地测量与地球动力学》2011,31(Z1):59-63

对十堰台的数字化水管仪2007-2010年倾斜潮汐观测资料进行全面质量评定后发现,运行3年以来的倾斜潮汐观测资料连续可靠,仪器工作正常稳定,零漂与年变幅等指标均在稳定范围内.长水管系列调和分析结果表明:倾斜潮汐观测在资料精确度、连续性和可用率3方面己接近国际同类水平,有些指标已超过国内优秀台站观测水平.倾斜资料于200...  相似文献   

地理信息服务网站服务器集群负载均衡技术应用研究     

翟永  杨曦 《国土资源信息化》2011,(4)

本文在分析基于互联网的地理信息在线服务特点和网站服务质量需求的基础上,对服务器负载均衡的构建方式、调度算法进行了讨论,给出了地理信息服务网站服务器两层负载均衡的设计模型,描述了Web服务器负载均衡的设备部署、调度算法、健康性检测和持续性服务等方面的设计内容;同时,讨论了文件和关系型数据库服务器负载均衡的设计思路和调度算法的具体应用。  相似文献   

利用不规则载荷模型分析马家岭流动水准异常     

郑海刚  闫伟  王雪莹  何康  李军辉  王俊 《中国地震》2016,32(3):533-538

通过环境调查等手段,收集整理马家岭水准观测场地周边环境变化参数及岩土力学参数,运用不规则二维载荷模型计算荷载引起的水准高差变化。结果显示,霍山大峡谷漂流场地停车场的建设对马家岭水准观测有一定影响,影响量约为0.77mm,与实际观测高差0.70mm接近,研究结果从定量模拟的角度证实了马家岭流动水准异常为环境荷载变化引起的地面高差变化。  相似文献   

An integrated suspended sediment transport monitoring and analysis concept   总被引：1，自引：1，他引：0  

Marlene HAIMANN  Marcel LIEDERMANN  Petra LALK  Helmut HABERSACK 《国际泥沙研究》2014,29(2):135-148

A new integrated suspended sediment monitoring strategy applying direct and indirect technologies is presented.Optical sensors continuously record the turbidity at one point in the channel cross section close to the river bank and are calibrated by water samples taken close to the sensor.Additionally measurements are performed to establish the distribution of suspended sediment in a cross section（bottle samples combined with acoustic devices）.Using correction factors（probe and cross-sectional factor） these monitoring methods are combined and it is,thus,possible to fully document the temporal and spatial variability of the suspended sediment transport and to estimate the suspended sediment load for certain time periods.This monitoring strategy was implemented at various measurement sites in Austria as well as at the Hainburg Road Bridge site on the Danube River.It has already been successfully applied for three years at this measurement site and suspended sediment loads during high discharges up to a 15 year flood event have been monitored.To evaluate the new monitoring methods the results were compared with load estimation methods found in the literature including averaging and ratio estimators as well as rating curves.The results prove that with the new methodology,the temporal variability of the suspended sediment transport can be detected more accurately compared with the other methods.They also demonstrate that the additional consideration of the spatial distribution of the suspended sediment concentration in the cross section is crucial as the mean concentration in the cross section can significantly exceed the concentration near the banks,especially at large rivers like the Danube River.  相似文献