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In this study, the total horizontal and vertical forces as well as the phase differences of irregular waves on a partially perforated caisson breakwater are investigated. The partially perforated caisson is located on a rubble fill foundation and filled with rock. Based on linear potential theory, a simple semi-analytical solution of the present problem is developed by means of the matched eigenfunction method and the finite element method. Experimental tests are also conducted to validate the theoretical model and examine the wave forces acting on the perforated caisson. The effects of some of the main factors on the total wave forces and the phase difference are examined. Theoretical and experimental studies show that when the total horizontal force reaches its peak, the simultaneous total vertical (upward) force is rather small or even becomes downwards. This is due to the existence of an obvious phase difference between the time histories of the total horizontal and vertical forces, which is an important advantage of perforated caissons over traditional structures. 相似文献
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通过对国内外GIS技术及其应用水平的剖析,提出了海岸带管理信息系统软件集成的发展方向,阐述了海岸带网络地理信息系统的软件开发、应用系统建设、信息集成方案等实现方法。 相似文献
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Some important scientific problems in current lithospheric physics research in China 总被引:3,自引:0,他引:3
China has achieved much during recent years in the area of lithospheric physics research and promoted the development of the geosciences (Teng, 2004). However, in the 21^st century, national needs and policy challenges the science of lithospheric physics. I suggest a general analysis, research, and development direction for lithospheric physics and point out clearly the content, core problems, and key scientific problems in this field. The realization of the earth and the discovery of the basic mechanisms of mountains, basins, minerals, and natural disasters depend basically on high-resolution observations of geophysics, the delineation of the fine structure of crust and mantle (2D and 3D) inside the lithosphere, substance and energy exchanges in the deep earth, the process of deep physical, mechanical, and chemical actions, and deep dynamical response. Therefore, geophysics should be the pioneer in the geosciences field in the first half of the 21^st century. I end with an analysis and discussion of some problems and difficulties in the research of lithospheric physics. 相似文献
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Wang Chao Wang Xuan Wang Yifan Zhan Jinyan Chu Xi Teng Yanmin Liu Wei Wang Huihui 《地理学报(英文版)》2023,33(2):392-412
Journal of Geographical Sciences - Rapid economic and social change promotes to improve human wellbeing (HW), but poses threats to ecosystems and the environment. Studying the coupling relationship... 相似文献
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?????GPS/COMPASS??????λ?????????????????????????????????????????????????????λ???????????????????????????????????????????????????????????????????????λ?????????????????????????? 相似文献
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