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191.
192.
卫星遥感技术应用在公路选线中,具有常规方法无可比拟的优势。在国道314线焉耆盆地段高速公路前期选线研究中,以Landsat-5 TM457数字图象为主要信息源,通过数据处理和遥感判释并综合分析常规资料,对恶煮盆地段第四纪堆积平原土体工程地质区进一步划分亚区,探讨分析了不良地质现象分布规律、形态背景及发展演化趋势,在此基础上比较各设计线路之优缺点,并提出科学合理的建议线路方案。 相似文献
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IntroductionPlumb line deflection (PLD) express the incline between the geoid and the surface of ellipsoidal earth, i.e., the deflection of the real plumb line of calculating point to the normal direction of the corresponding point in the ellipsoidal surface. It varied in the range of about 3(~5( generally, and the largest value will be 20(~30( in spatial domain. Plumb line is closely related to spatial distribution of gravity field on the earth surface. PLV of a point on the earth surface c… 相似文献
195.
Pebble clusters are common small‐scale morphological features in gravel‐bed rivers, occupying as much as 10 per cent of the bed surface. Important links exist between the presence of pebble clusters and the development of flow structures. These links are poorly understood at the three‐dimensional level. Particularly neglected has been the effect of clusters on the lateral flow characteristics. A laboratory study was conducted using a hydraulic flume, within which simulated pebble clusters were superimposed onto a plane bed of gravel material. High‐resolution three‐dimensional flow data were collected above the bed at two different flow depths using an acoustic Doppler velocimeter. The results present evidence of the importance of lateral flow in the development of turbulent flow structure. Narrow regions of high lateral and downstream turbulence intensity exist to both sides of clusters and in a three‐dimensional separation zone in their lee. This may indicate the presence of horseshoe‐type vortical structures analogous to those identified in less hydraulically rough environments. However, it is likely that these structures are more complicated given the mutual interference of the surrounding medium. The lateral flow was also identified as a key component in the upwelling identified by other authors in the lee of pebble clusters. The results of the vertical flow analysis confirm the hypothesis that six regions with distinct vertical flow characteristics exist above clusters: flow acceleration up the stoss‐side of the cluster; recirculation behind the cluster in the wake region; vortex shedding from the pebble crest and shear layer; flow reattachment downstream of the cluster; upwelling of flow downstream of the point of reattachment; and recovery of flow. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
196.
G Nageswara Rao 《Journal of Earth System Science》2001,110(1):87-94
It is well known that heavy rainfall occurs in the southwestern sector of the monsoon depressions due to strong convergence
in that sector. By examining the rainfall distribution associated with the monsoon disturbances (lows and depressions) in
one of the central Indian river basins, ‘Godavari’, the author found that when the disturbance-centre is away from the basin,
heavy rainfall may also occur in the basin area close to the confluence line and cause severe floods in the river. The confluence
line is the zone of convergence between the northeasterlies to the west of the disturbance centre and the monsoon westerlies.
This study further reveals the importance of the position and movement of the confluence line with respect to the basin, on
which the intensity and the raising period of the resulting flood depend. 相似文献
197.
几种滤波器对地面飑线场的中尺度滤波试验 总被引:4,自引:0,他引:4
本文用Barnes带通滤波法,二十五点格式滤波法,对含有地面幅合线和飑线的地面加密观测资料和客观分析资料进行了中尺度滤波试验,结果表明,三种滤波器的作用结果都胡有效突出地面辐合线和飑线的中尺度特征,其中Barnes法的性能和结果较理想,二十五点法和高阶高通法各有特点。 相似文献
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本文介绍了古田汉一级大坝原有变形观测项目及存在的主要问题,提出了观测系统改造的原则和要求。详细论述了各观测项目增设、改造及自动化设计的实施方案,给出了相应的精度估算。 相似文献
200.
IntroductiontoanInvariantQuantityMethodLiuGuifu(刘桂复)(NamingInstituteofMeteorology,Naming210044ReceivedMarch11.1995,revisedJun... 相似文献