日照水库及周边区域综合地质条件分析          下载免费PDF全文

葛文海  王集宁  寻知锋  贺兆成 《山东国土资源》2015,31(1):46-49,54

日照水库是1959年建成的一座大(二)型水库,位于日照市东港区驻地以西16 km处的付疃河中游,控制流域面积548 km2,是日照城市及国民经济发展的最重要水源保障。近年来日照市经济社会飞速发展,特别随着"山东精品钢基地"等大项目的开工建设,供水安全形势愈发严峻,如何维护日照水库和保护这一水源地更是被提到了重要的议事日程。先行研究分析流域地质条件,是做好日照水库保护建设工作的重要基础。  相似文献   

对陡坡陡崖引发地质灾害的潜在影响范围进行建模分析     

章豪  温剑峰  陈温清  徐刚  史瑞洁  戴欣宜  陈杰  朱安峰  范全龙 《测绘通报》2021,(6):117-121,133

陡坡陡崖作为一种特殊的地形地貌,是造成滑坡、泥石流等各种地质灾害的重要因素之一。由陡坡陡崖引发的地质灾害会破坏人造地物,对人类的生命财产安全造成严重危害。本文利用DEM数据提取了浙江省温州市的陡坡陡崖,对温州市陡坡陡崖的影响范围进行系统研究,构建了温州市陡坡陡崖的潜在滑坡方向模型,并确定其对人造地物（如道路、房屋）的影响。本文主要研究内容有以下两个：①提取陡坡陡崖并对其潜在滑坡方向进行建模;②根据影响范围提取受影响的人造地物并建立基础数据库。结果表明,温州市的陡坡陡崖数量多,分布范围广且集中,其引发的地质灾害会对人造地物造成严重的潜在影响。本文构建的温州市基础数据库可以描述陡坡陡崖潜在影响的房屋和道路的位置,确定灾害重点防治区域,为温州市的灾害防治工作提供服务。  相似文献   

2.5-D DC Resistivity Modeling Considering Flexibility and Accuracy     

汤井田  王飞燕  肖晓  张林成 《中国地质大学学报(英文版)》2011,(1)

We highlighted the flexibility of using unstructured mesh together with the local refinement by a resistivity model with complicated topography. The effect of topography is emphasized. Based on this, we calculated a specific class of layered models and found that the accuracy is not always satisfactory by utilizing the standard approach. As an improvement, we employed the layered earth as the reference model to calculate the wavenumbers. The comparison demonstrates that the accuracy is considerably improved...  相似文献   

复杂岛屿海域的台风浪局地特征模拟与分析——以舟山海域为例   总被引：1，自引：0，他引：1  

毛科峰  陈希  萧中乐  王骥鹏  梁毅 《海洋学研究》2011,29(4):8-15

为了研究舟山海域复杂地形条件下的台风浪特征,在高分辨数值模拟中采用了利用海图资料处理复杂岛屿地形分布的方法,利用WAVEWATCHⅢ和SWAN模式相嵌套模拟了影响该海域的西北行路径的典型台风浪过程.分析表明,舟山海域的东南部、东北部、西北部、内部海域受台风的影响各不相同,台风浪特征分布与海域的岛屿分布、水深分布等因素密...  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987114000905     

Petar Gliovi  Alessandro M.Forte 《地学前缘(英文版)》2015,6(1):3-22

Although there has been significant progress in the seismic imaging of mantle heterogeneity,the outstanding issue that remains to be resolved is the unknown distribution of mantle temperature anomalies in the distant geological past that give rise to the present-day anomalies inferred by global tomography models.To address this question,we present 3-D convection models in compressible and self-gravitating mantle initialised by different hypothetical temperature patterns.A notable feature of our forward convection modelling is the use of self-consistent coupling of the motion of surface tectonic plates to the underlying mantle flow,without imposing prescribed surface velocities(i.e.,plate-like boundary condition).As an approximation for the surface mechanical conditions before plate tectonics began to operate we employ the no-slip(rigid) boundary condition.A rigid boundary condition demonstrates that the initial thermally-dominated structure is preserved,and its geographical location is fixed during the evolution of mantle flow.Considering the impact of different assumed surface boundary conditions(rigid and plate-like) on the evolution of thermal heterogeneity in the mantle we suggest that the intrinsic buoyancy of seven superplumes is most-likely resolved in the tomographic images of present-day mantle thermal structure.Our convection simulations with a plate-like boundary condition reveal that the evolution of an initial cold anomaly beneath the Java-Indonesian trench system yields a long-term,stable pattern of thermal heterogeneity in the lowermost mantle that resembles the presentday Large Low Shear Velocity Provinces(LLSVPs),especially below the Pacific.The evolution of subduction zones may be,however,influenced by the mantle-wide flow driven by deeply-rooted and longlived superplumes since Archean times.These convection models also detect the intrinsic buoyancy of the Perm Anomaly that has been identified as a unique slow feature distinct from the two principal LLSVPs.We find there is no need for dense chemical ’piles’ in the lower mantle to generate a stable distribution of temperature anomalies that are correlated to the LLSVPs and the Perm Anomaly.Our tomography-based convection simulations also demonstrate that intraplate volcanism in the south-east Pacific may be interpreted in terms of shallow small-scale convection triggered by a superplume beneath the East Pacific Rise.  相似文献   

Dynamic morphology of small south‐eastern Mediterranean river mouths: a conceptual model     

Michal Lichter  Micha Klein  Dov Zviely 《地球表面变化过程与地形》2011,36(4):547-562

River mouths along the Israeli Mediterranean coast are characterized by a dynamic morphology as their channels migrate hundreds of meters along the coast. This study examines the dynamic morphology of seven such river mouths. It offers a conceptual model aimed at generalizing and describing their spatial and temporal morphological patterns, and the environmental factors influencing them. The study methodology comprised a detailed monitoring and mapping by GIS techniques, with quantitative data derived from historic aerial photographs, river discharge records, wave measurements, and a digital elevation model. These data were incorporated into a homogenous database and subsequently applied in the investigation of the morphological patterns of these mouths, and the analysis of their influencing factors. River mouths in this study occur in two distinctive topographic settings. In one setting (here termed barrier topography) the river mouth is deflected alongshore by a sandy barrier. In the second setting (termed funnel topography) the river mouth is confined to a funnel‐shaped topographic depression perpendicular to the coast. The behavior of river mouths in these two settings is quite distinctive. Barrier mouths usually migrate over larger distances, as they tend to deflect along a sand barrier and establish semi‐permanent channels along the dune toe. This enables the wide range migration of semi‐permanent channels over decades. Funnel topography mouths deflect over shorter distances and they rapidly migrate within the funnel boundaries. This study concludes that the topographic setting of the beach, a constant element in the temporal scale of this study, is the primary influencing factor on the morphology of the mouths studied. The influence of other factors on the morphology of these mouths differs in space and time and depends on the topographic settings.  相似文献   

基于多波束声纳数据与反射模型的水下地形重建     

顾晨  黄微  李先华 《测绘科学》2011,36(4):80-82

利用多波束声纳数据重建水下地形,构建高空间分辨率的数字高程模型(DEM)对于在复杂水下区域的物质勘探、目标检测等方面有重要实用意义.然而,多波束声纳系统直接获得的测深数据空间分辨率有限本文基于多波束声纳系统采集的稀疏测深数据(空间位置)和密集回波强度数据(图像性质)来构建水下复杂地形高空间分辨率数字高程模型.利用采集的...  相似文献   

海底入射角对多波束反向散射强度的影响及其改正   总被引：3，自引：0，他引：3  

金绍华  翟京生  刘雁春  崔高嵩 《武汉大学学报(信息科学版)》2011,36(9):1081-1084

综合考虑测船姿态、声线弯曲和海底地形对入射角的影响,推导了计算多波束海底入射角的实用模型。根据Lambert法则,改正海底入射角对反向散射强度的影响。实例计算结果表明,所述模型能精确地计算波束在海底的入射角,有效地改正其对反向散射强度的影响。  相似文献   

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李永生  张景发  姜文亮  罗毅  王晓醉 《大地测量与地球动力学》2015,35(1):145-149

????????λ???????????????3????????????????????編???н??????????????????????????????????2007~2010?????20??ENVISAT ASAR?????÷????????????????????Э??????????У?????????????????й????????????Э?????????????????????3.1 mm²??????0.6mm²????????80%??e-folding???????????1.5 km?????0.21 km????????86%????????編??????Ч??У????????е??????λ?????  相似文献   

基于ICESat/GLAS高度计数据的SRTM数据精度评估——以青藏高原地区为例   总被引：1，自引：0，他引：1  

万杰  廖静娟  许涛  沈国状 《国土资源遥感》2015,(1):100-105

为全面了解航天飞机雷达测图计划(shuttle Radar topography mission,SRTM)高程数据的精度及误差特征,利用精度更高的ICESat/GLAS激光高度计数据(简称ICESat高度计数据)为参照数据,以具有多种地貌类型的中国青藏高原地区为实验区,采用双线性插值算法分析了SRTM在中国青藏高原地区的高程精度,以及SRTM高程数据与地形因子(坡度和坡向)间的关系。实验结果表明:在青藏高原地区,ICESat高度计数据与相对应的SRTM高程数据高度相关,相关系数高达0.999 8;SRTM的系统误差为2.36±16.48 m,中误差(RMSE)为16.65 m;当坡度低于25°时,SRTM高程数据精度随坡度增大而显著降低。此外,相对于ICESat高度计数据,SRTM在青藏高原地区N,NW和NE方向的测量值偏高,在S,SE和SW方向的测量值偏低。  相似文献