Numerical Simulation of Andhra Severe Cyclone (2003): Model Sensitivity to the Boundary Layer and Convection Parameterization   总被引：1，自引：0，他引：1  

C. V. Srinivas  R. Venkatesan  D. V. Bhaskar Rao  D. Hari Prasad 《Pure and Applied Geophysics》2007,164(8-9):1465-1487

The Andhra severe cyclonic storm (2003) is simulated to study its evolution, structure, intensity and movement using the Penn State/NCAR non-hydrostatic mesoscale atmospheric model MM5. The model is used with three interactive nested domains at 81, 27 and 9 km resolutions covering the Bay of Bengal and adjoining Indian Peninsula. The performance of the Planetary Boundary Layer (PBL) and convective parameterization on the simulated features of the cyclone is studied by conducting sensitivity experiments. Results indicate that while the boundary layer processes play a significant role in determining both the intensity and movement, the convective processes especially control the movement of the model storm. The Mellor-Yamada scheme is found to yield the most intensive cyclone. While the combination of Mellor-Yamada (MY) PBL and Kain-Fritsch 2 (KF2) convection schemes gives the most intensive storm, the MRF PBL with KF2 convection scheme produces the best simulation in terms of intensity and track. Results of the simulation with the combination of MRF scheme for PBL and KF2 for convection show the evolution and major features of a mature tropical storm. The model has very nearly simulated the intensity of the storm though slightly overpredicted. Simulated core vertical temperature structure, winds at different heights, vertical winds in and around the core, vorticity and divergence fields at the lower and upper levels—all support the characteristics of a mature storm. The model storm has moved towards the west of the observed track during the development phase although the location of the storm in the initial and final phases agreed with the observations. The simulated rainfall distribution associated with the storm agreed reasonably with observations.  相似文献   

Town of Tornio in November 1898: a rare survey of earthquake damage in Finland     

Päivi Mäntyniemi 《Journal of Seismology》2007,11(2):177-185

This study investigates the effects of the Fennoscandian earthquake that occurred on 4 November 1898 (GMT) on Tornio in Northern Finland. The extra fire inspection conducted in the town on 21, 22 and 23 November 1898 provided insight into the failures caused by this low-magnitude earthquake. The building stock was of timber with masonry stone components. More than 30 heating units sustained damage. The macroseismic intensity in Tornio is estimated at I = 6 (European Macroseismic Scale).  相似文献   

四川古蔺县蒿枝湾滑坡灾毁土地整理可行性研究   总被引：4，自引：0，他引：4  

吴树仁  田震远  吴锡浩  石菊松  雷伟志  范树应  胡江  孙应举 《水文地质工程地质》2002,29(4):21-23

在野外调查四川省古蔺县近年来滑坡灾毁土地情况和特征的基础上，以蒿枝湾滑坡为例，分析蒿枝湾滑坡基本特征和灾毁土地现状，并从滑坡潜在稳定性、工程技术条件和社会经济效益等方面探讨滑坡灾毁土地整理的可行性。  相似文献   

吐哈盆地水文地质条件研究   总被引：5，自引：1，他引：5  

谭鸿赞 《铀矿地质》2002,18(2):97-103

铀成矿层间氧化带的形成，发育与地下水的形成演化密切相关，本文采用古水文地质的分析方法，对吐哈盆地地下水的演化史进行了研究，定量确定了地静压力系统和水静压力系统对沉积水的改造作用，计算了压挤水和渗入水的水交替强度，指出了铀成矿层间氧化带发育的有利地区。  相似文献   

绥化电视发射塔工程场址地震基本烈度影响因素的探讨     

薛仲新 《东北地震研究》2001,17(3):51-59

采用同一地震带中两个不同潜在震源区的统计模型，讨论了当潜在震源区分方法不同时对场址基本烈度的影响。  相似文献   

利用地磁场总强度预测地震三要素初探          下载免费PDF全文

王庆玺  欧阳小龙 《地震工程学报》2001,23(2):131-136

计算了河南省6个台站的相邻时段的地磁场总强度观测资料的自相关系数分析了各台自相关系数的变化与地震的关系，各台的自相关系数曲线对应地震的效果较好，发震时间一般在异常低值后1-8个月，统计得出了各台所对应的地震震级与自相关系数异常面积和震中距的经验公式，利用3个以上台站的经验公式和交汇法，即可以求出震中位置和地震震级，经震例检验，该方法基本可行。  相似文献   

河南内乡-镇平ML4.7级地震及其震前 地震活动特征   总被引：2，自引：1，他引：2  

谢智  王文旭  刘尧兴  胡凤英  许孝法 《华南地震》2001,21(1):26-31

2000年4月29日河南内乡－镇平ML4．7级地震是一次显著地震事件，地震序列属孤立型，根据震区地震地质背景，等震线分布以及震源机制解的综合分析表明，发震断层为北西向的朱阳关－桐柏断裂，对1992年至今该区2．0级以上地震空间分布的研究认为，震前的地震空间分在由无序到有序的演化过程，即存在一个地震正常活动，地震空间，地震条带，震前震中区平静至发震的发展过程。  相似文献   

Land use changes in the environs of Moscow   总被引：1，自引：0，他引：1  

Grigory Ioffe  & Tatyana Nefedova 《Area》2001,33(3):273-286

This paper focuses on several aspects of land use change in Russia during the 1990s with a particular focus on the environs of Moscow. These aspects include modes of farming, recreation, ownership of land, and concentric zones of outwardly declining land use intensity that resemble Von Thunen's economic landscape. These zones are given special attention. In contrast to other land use aspects, the analysis of which indeed reveals a fair amount of change bringing the environs of Russian cities one step closer to their Western counterparts, concentric agricultural land use patterns with outwardly declining productivity suggest continuity rather than change.  相似文献   

Long-term climato-limnological cycles found in a 3.5-million-year continental record     

Kenji Kashiwaya  Hideo Sakai  Masayuki Ryugo  Masae Horii  Takayoshi Kawai 《Journal of Paleolimnology》2001,25(3):271-278

Analysis of physical properties in long sediment cores (BDP96) from Academician Ridge in Lake Baikal indicates that major climato-limnological changes during the past 3.5 Myr occurred at about 2.5–2.8, 1.7–1.9, and 0.9–1.2 Ma, which were close to times of major geomagnetic polarity reversals (Matuyama/Gauss, Olduvai, Jaramillo + Matuyama/Brunhes). The principal climato-limnological oscillation has a long-term period of nearly 1,000 kyr, which corresponds to the periodicity of fluctuation in solar insolation. It also seems to be related to geomagnetic field intensity. Other long-term period of 400 kyr corresponds to Milankovitch parameters of eccentricity. These results suggest that changes in solar insolation were closely related to long-term environmental variations in the deep continental interior.  相似文献   

A study of design spectra based on attenuation relationship of ground motion     

NI Yong-jun  ZHU Xi 《地震学报(英文版)》2001,14(6):705-710

In recent years, more and more studies are focused on the performance in seismic design instead of the strength of structures. People have realized that the structure deformation (displacement) can describe the damage more properly and directly than the strength (force). The displacement design spectra need to be constructed within more wide range of the period and the damping for the displacement-based seismic design.  相似文献