分区经验性地震综合预报指标的初步研究     

程万正  陈立德 《四川地震》1997,(1):40-47

本文简要给出了滇，川及邻区近年短临地震综合预报的经验性作法和预报指标，从不同角度探索了进入强震短临阶段和强震三要素的经验性综合分析方法。  相似文献   

副高持续偏强对福建气候的影响          下载免费PDF全文

许金镜  唐文伟  林仲平 《气象》1997,23(1):36-37

作者以１９５１－１９９５年副高持征量的气温、降水等气象要素为素材，分析了副高持续性偏强的基本事实和对福建天气气候的影响。  相似文献   

THE EFFECTS OF EXTERNAL FORCING,DISSIPATION AND NONLINEARITY ON THE SOLUTIONS OF ATMOSPHERIC EQUATIONS^*     

Li Jianping  Chou Jifan 《Acta Meteorologica Sinica》1997,11(1):57-65

Based on the primitive equations of the atmosphere,we study the effects of external forcing.dissipation and nonlinearity on the solutions of stationary motion and non-stationary motion.The results show that the asymptotic behavior of solutions of the forced dissipative nonlinear system is essentially different from that of the adiabatic non-dissipative system,the adiabatic dissipative system,the diabatic non-dissipative system and the diabatic dissipative linear system,and that the joint action of external forcing,dissipation and nonlinearity is the source of multiple equilibria.From this we can conclude that the important actions of diabatic heating and dissipation must be considered in the models of the long-term weather and the climate.  相似文献   

福建沿海农村风能资源的开发利用     

汪富明  汪建东 《地域研究与开发》1997,16(3):76-79

在调查基础，论述开发了风能资源的意义，并对福建沿海农村风能量资源进行了评价，提出了开发农村风能的措施。  相似文献   

高粘性牛顿流体粘性耗散的快速计算方法          下载免费PDF全文

陈建军  任彦蓉 《盐湖研究》1997,5(1):76-80

螺旋泵可用来输送高粘性液体，该过程中由于液体的温度升高而粘度降低，因而其粘性耗散不能忽略。本文介绍一种上述情况下计算液体粘度、泵的功率和压力降的近似公式。  相似文献   

祁连山地区1310年以来湿润指数及其年际变幅的变化与突变分析   总被引：23，自引：0，他引：23  

张志华  吴祥定 《第四纪研究》1996,16(4):368-378

本文通过用树木年轮资料重建的祁连山地区5～7月份1310年以来的湿润指数序列，建立了一个反映该地区湿润指数年际变幅序列，对这两个序列分别进行了等级分类和干湿、强弱的时段分析，并用最大熵谱分析法对这两个序列的不同时段分别进行了周期分析。采用HK突变检验方法对这两个序列分别进行了突变分析，发现祁连山地区的湿润指数及其年际变幅存在明显的突变年份。  相似文献   

分离的大陆板块边缘镁铁－超镁铁岩系Th／Hf—Ta／Hf判别   总被引：1，自引：0，他引：1  

张成江  程长莹  汪云亮 《物探化探计算技术》1996,(Z1)

本文在论述了Ｔｈ／Ｈｆ－Ｔａ／Ｈｆ关系判别岩浆岩源区大地构造环境机理的基础上，根据世界上典型大地构造环境区岩浆岩系的Ｔｈ、Ｔａ、Ｈｆ特征，提出了分离的大陆板块边缘镁铁－超镁铁岩的Ｔｈ／Ｈｆ—Ｔａ／Ｈｆ判别标志：Ｔｈ／Ｔａ＝１．８～４．０，Ｔａ／Ｈｆ＞０．１。  相似文献   

山西离柳矿区奥陶系灰岩水环境质量分区及成因研究     

张玉良 《华北地质矿产杂志》1996,11(2):237-244

本文对离柳矿区奥陶系灰岩岩溶地下水的环境质量进行了评价和分区，结合地质条件简述了各区的特点；还用地质－水文地质学相结合的理论，对各环境质量区形成的原因，进行了分析和研究，进而从理论上证明环境质量分区和选用标准的合理性。  相似文献   

The mean and turbulence structure simulation of the monsoon trough boundary layer using a one-dimensional model withe-l ande-ε closures     

Kusuma G. Rao  V. N. Lykossov  A. Prabhu  S. Sridhar  E. Tonkacheyev 《Journal of Earth System Science》1996,105(3):227-260

An attempt has been made here to study the sensitivity of the mean and the turbulence structure of the monsoon trough boundary layer to the choice of the constants in the dissipation equation for two stations Delhi and Calcutta, using one-dimensional atmospheric boundary layer model withe-ε turbulence closure. An analytical discussion of the problems associated with the constants of the dissipation equation is presented. It is shown here that the choice of the constants in the dissipation equation is quite crucial and the turbulence structure is very sensitive to these constants. The modification of the dissipation equation adopted by earlier studies, that is, approximating the Tke generation (due to shear and buoyancy production) in theε-equation by max (shear production, shear + buoyancy production), can be avoided by a suitable choice of the constants suggested here. The observed turbulence structure is better simulated with these constants. The turbulence structure simulation with the constants recommended by Aupoixet al (1989) (which are interactive in time) for the monsoon region is shown to be qualitatively similar to the simulation obtained with the constants suggested here, thus implying that no universal constants exist to regulate dissipation rate. Simulations of the mean structure show little sensitivity to the type of the closure parameterization betweene-l ande-ε closures. However the turbulence structure simulation withe-ε. closure is far better compared to thee-l model simulations. The model simulations of temperature profiles compare quite well with the observations whenever the boundary layer is well mixed (neutral) or unstable. However the models are not able to simulate the nocturnal boundary layer (stable) temperature profiles. Moisture profiles are simulated reasonably better. With one-dimensional models, capturing observed wind variations is not up to the mark.  相似文献   

斜坡稳定性分析的模糊综合评判应用初探   总被引：1，自引：0，他引：1       下载免费PDF全文

冉恒谦 《探矿工程》1996,(6):19-22

采用两级模糊综合评判方法，在对评判实例的稳定性因素的定性分析基础上，选取主要因素四类１４项作为稳定性评价指标并将其定量化，按稳定，较稳定，较不稳定和不稳定四个级别进行综合评判，评判结果与斜坡的实际情况有较好的一致性。  相似文献