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431.
432.
S波分裂方法在荣昌地震研究中的初步应用 总被引:1,自引:1,他引:1
简要介绍了S波分裂方法的基本理论,在地震分析研究中的计算方法,以及在荣昌地震研究中的一些初步应用.作者选取2003年1月至2005年10月重庆荣昌单台数字化波形,利用S波分裂方法进行处理,从而求得该地区不同时段应力的优势方向以及S波延迟时间,为地震预报和区域应力场研究提供有用信息. 相似文献
433.
Modelling the motion of an internal solitary wave over a bottom ridge in a stratified fluid 总被引:1,自引:0,他引:1
Yakun Guo Johan Kristian Sveen Peter A. Davies John Grue Ping Dong 《Environmental Fluid Mechanics》2005,4(4):415-441
A series of laboratory experiments has been carried out to investigate the passage of an internal solitary wave of depression over a bottom ridge, in a two-layer fluid system for which the upper and lower layer is linearly-stratified and homogeneous respectively. Density, velocity and vorticity fields induced by the wave propagation over the ridge have been measured simultaneously at three locations, namely upstream, downstream and over the ridge crest, for a wide range of model parameters. Results are presented to show that wave breaking may occur for a sufficiently large wave amplitude and a strong ridge blockage factor, with accompanying mixing and overturning. Density field data are presented (i) to illustrate the overturning and mixing processes that accompany the wave breaking and (ii) to quantify the degree of mixing in terms of the wave and ridge parameters. For weak encounters, good agreement is obtained between the laboratory experimental results (velocity and vorticity fields induced by the wave propagation) and the predictions of a recently-developed fully nonlinear theory. Discrepancies between theory and experiment are discussed for cases in which breaking and mixing occur. 相似文献
434.
The impact of wake wash from high-speed ferries on the coastal environment in non-tidal seas is analysed in terms of wave
energy and power, and properties of the largest waves. Shown is that hydrodynamic loads caused by heavy high-speed traffic
may play a decisive role not only in low-energy coasts but also in certain areas with high wind wave activity. For example,
ship-generated waves form, at least, about 5–8% from the total wave energy and about 18–35% from the wave power in the coastal
areas of Tallinn Bay exposed to dominating winds. The periods of wake waves from high-speed ships frequently are much larger
than dominating periods of wind waves. The leading waves typically have a height of about 1 m and a period of 10–15 s. Such
waves extremely seldom occur in natural conditions in many regions of semi-enclosed seas. They cause unusually high hydrodynamic
loads in the deeper part of the nearshore. The fast ferry traffic thus is a qualitatively new forcing component of vital impact
on the local ecosystem. It is demonstrated that wakes from high-speed ferries may trigger considerable changes of the existing
balance of coastal processes. Owing to their low decay rates combined with their exceptional compactness after crossing many
kilometres of the sea surface, such wakes may cause considerable remote impact of the ship traffic. This feature has to be
addressed in the analysis of the impact of harbours and associated ship traffic in the neighbourhood of vulnerable areas. 相似文献
435.
低纬高原城市区域冬季的大气环境与不同波长辐射特征 总被引:2,自引:0,他引:2
本文以低纬高原城市昆明市为研究对象,利用城市内外不同波长辐射的实测资料,分析了颥人、外不同波长辐射的分布特征、变化规律及共差异以及与大气环境的相互关系,探讨了城市及大气环境对太阳辐射的影响为城市气候的深入研究以及城市建筑的规划、设计、环境污染防治提供依据,并可为其它地区的同类研究提供参考。 相似文献
436.
437.
本文对低应变反射波法基桩动测资料分析中存在的信号分析方法、尺寸效应、桩周土的影响等问题的最新研究进展进行了分析,并且对相应问题给出了一些建议和可能的解决方法. 相似文献
438.
保护层一次爆除技术在船闸开挖中的应用 总被引:2,自引:1,他引:1
在贵港航运枢纽工程船闸开挖中,采用了孔间微差和宽孔距小梯段孔底设柔性保护层的一次钻爆技术,确保了基岩的完整性。 相似文献
439.
Impulsive waves caused by subaerial landslides 总被引:10,自引:0,他引:10
This paper presents the experimental results of impulsive waves caused by subaerial landslides. A wide range of effective
parameters are considered and studied by performing 120 laboratory tests. Considered slide masses are both rigid and deformable.
The effects of bed slope angle, water depth, slide impact velocity, geometry, shape and deformation on impulse wave characteristics
have been inspected. The impulse wave features such as amplitude, period and also energy conversation are studied. The effects
of slide Froude number and deformation on energy conversation from slide into wave are also investigated. Based on laboratory
measured data an empirical equation for impulse wave amplitude and period have been presented and successfully verified using
available data of previous laboratory works. 相似文献
440.