简单热带海气耦合模型中的缓慢扰动Ⅰ:对称和反对称于赤道的运动     

林一骅  傅云飞 《气象学报》2001,59(1):1-9

文中讨论了在局地热平衡情况下简单模式中的热带海气耦合扰动，指出参数K  相似文献   

简单热带海气耦合模型中的缓慢扰动I:对称和反对称于赤道的运动     

林一骅  傅云飞 《气象学报》2001,(1)

文中讨论了在局地热平衡情况下简单模式中的热带海气耦合扰动 ,指出参数 KH,KS和α决定着耦合扰动性质 ,并研究了使用抛物线柱函数展开时所截项数多寡对耦合扰动性质的影响以及对称和反对称于赤道的耦合扰动特征  相似文献   

青岛市海雾海气通量观测及其作用初探     

徐静琦  魏皓  张正  顾海涛 《气象学报》1996,54(2):207-215

概述１９９３年６月下旬－７月上旬在青岛市小麦岛东侧进行的风、温、湿梯度观测。其资料经迭代计算得到了黄海北部、青岛市近海平流雾季节海气间动量、热量和水汽的通量。并对７月１—２日的一个海雾过程进行了微物理分析。  相似文献   

    

Li Yang  Mu Mu 《大气科学进展》1996,13(1):33-42

By employing Arnol’d’s method (energy-Casimir), this paper has studied the nonlinear stability of the two-layer generalized Phillips’ model for which the top and bottom surfaces are either rigid or free, and obtained some nonlinear stability criteria. In addition, some linear stability criteria are obtained by normal mode method. The results reveal the influences of the free surface parameter on the stability of atmospheric and oceanic motions.  相似文献   

冷迳流的稳定性及其解析解的分析     

欧阳首承  朱克云  肖天贵 《大气科学》1992,16(4):502-507

本文利用相法讨论了y方向无限伸延的冷迳流方程.首先发现其非线性项作用由于z方向上的补偿作用而消失,即其相空间的方程是四阶线性常微分方程.利用Hurwitz方法分析其稳定时,证明了唯有中性大气符合冷迳流的稳定性条件.其解析解的趋势表明与观测结果类似.  相似文献   

丽江-大理地区地壳稳定性评价     

马玲  范柱国  吴伟 《云南地质》2006,25(3):367-373

采用模糊数学综合评判法，对丽江-大理地区的地壳稳定性作定量评价，认为该区地壳稳定性可划分为三类，各亚类地壳稳定性不均一。  相似文献   

Influence of earthquakes on the stability of slopes   总被引：2，自引：0，他引：2  

Robert Hack  Dinand Alkema  Gerard A.M. Kruse  Noud Leenders  Lucia Luzi 《Engineering Geology》2007,91(1):4-15

Earthquakes are a major trigger for instability of natural and man-made slopes. Often the instability of slopes due to an earthquake causes more destruction and kills more people than the actual earthquake itself. A comparison is made between different methodologies to analyze the potential stability of slopes during earthquakes. Theoretically, it seems simple to calculate the stability of a slope during an earthquake. In reality, however, the stability is influenced by so many parameters that are either not known or which influence is so poorly known that a decent estimation of stability cannot be made. Offshore the situation is worse because proper data required for stability calculations are even less available than onshore. On- and offshore, erosion and weathering create continuously slopes that may become unstable during a future earthquake, offshore also sedimentation creates continuously new slopes. Another fundamental problem in stability analysis is the complicated and largely unknown behavior of seismic waves in three-dimensions in natural materials. The lack of accurate data and the unknown behavior of seismic waves in three-dimensions make estimations of slope stability during an earthquake unreliable.  相似文献   

软、硬岩体沉陷变形规律研究     

李明  兰凤娟  汪吉林 《江苏地质》2007,31(3):268-270

煤层顶板覆岩一般以页岩、砂岩、灰岩等沉积岩为主,其物理力学性质差异很大。研究了应用模型实验方法探索煤层采后顶板沉陷变形的变化规律,为评价采空区沉陷稳定提供了依据。  相似文献   

A classification system for the assessment of slope stability of terrains along highway routes in Jordan   总被引：2，自引：0，他引：2  

A. S. Al-Homoud  Y. Masanat 《Environmental Geology》1998,34(1):59-69

 The establishment of comprehensive development plans, in general, and the proper selection of highway routes, in particular, require an assessment of landslides or instability hazards in the project sites. The frequent landslides that occurred along the routes of major highways in Jordan, and particularly along the Amman-Na'ur-Dead Sea highway and Irbid-Jerash-Amman highway, have substantially increased the cost of construction and caused a considerable delay in the completion of work. The study of many landslides that occurred in the last 25 years along the highway routes and in the sites of some major civil engineering projects in Jordan has led to the recognition of major factors that affect the stability of slopes, and thus the safety and economics of these projects. The geological formation, structural features, topographic characteristics, geometry, and climatic conditions were adopted as the basis for the classification of terrains in terms of their stability. Each factor has been assigned a rating to indicate its relative contribution to the overall stability according to engineering judgment and past experience. The areas have been classified into 5 groups according to their total stability rate. The simplicity, comprehensiveness, and accuracy are the main characteristics of the proposed classification. Its significance stems from its helpfulness as a guide to the geotechnical and highway engineers in assessing the overall stability of the alternative routes of proposed highway projects. Received: 3 December 1996 · Accepted: 29 April 1997  相似文献   

黄土基底构筑物边坡稳定的研究方法   总被引：1，自引：0，他引：1  

祖国林  洪宇 《地质灾害与环境保护》1998,9(4):16-20

我国适合露天开采的煤田,主要分布在西部及西北部的黄土高原地区。黄土基底构筑物在加载过程中,曾出现过某些惨痛的工程教训。基于黄土基底排土场形成后黄土底工程性质演化规律及失稳机制分析,提出其边坡稳定的研究方法,对黄土高原地区煤炭资源开发建设具有重要的理论与实际意义。  相似文献