论灾害地貌学的性质及研究内容   总被引：1，自引：0，他引：1  

唐晓春 《地球科学进展》1991,6(5):38-43

灾害地貌学是一门崭新的、正在开拓之中的边缘科学。在前人大量研究的基础上,对灾害地貌的分类和灾害地貌的学科性质及其研究的主要内容进行了探讨。  相似文献   

青海湖水位的月际变化     

高晓清  汤懋苍 《高原气象》1992,11(3):305-311

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水稻生长发育动态监测农业气象模式研究   总被引：1，自引：0，他引：1  

陶炳炎  汤志成 《南京气象学院学报》1992,15(2):82-91

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地开石-高岭石混层矿物的电子顺磁共振(EPR)研究     

蔡秀成  梁绍暹  陈世悦  富毓德  唐荣炳 《矿物学报》1992,12(2):152-158

本文首次利用EPR研究了我国北方石炭-二叠纪煤系地层粘土岩中的粗晶(1～2mm)。与粉末状地开石、高岭石、地开石-高岭石混合样的Fe~(3+)EPR谱对比证明,这些粗晶是一种地开石-高岭石(D-K)的非规则混层矿物,其单晶的EPR表明,Fe~(3+)离子有两种位置:低对称位置,引起弱各向异性的Ⅰ线,λ～0.30;高对称位置,给出强各向异性的E线,λ～0.24。这对历来认为高岭石的Fe~(3+)谱中Ⅰ线为各向同性的看法是一个有益的修正。Ⅰ呈双线(Ⅰ_1及Ⅰ_2)是鉴定这种粗晶属于D-K混层矿物的一个特征标志。  相似文献   

Research on thermal structure and thermal stress of the crust in Bohai Sea and its surroundings     

Hua Tian  Zhili Zhang 《地震学报(英文版)》1992,5(4):699-707

In this paper, the three-dimensional thermal structure and the two-dimensional thermal stress caused by the horizontal inhomogeneity of the thermal structure in the crust of the Bohai Sea and its surroundings were analyzed using the geothermal and the crust structural data by means of the finite element method. As resulted, the horizontal distribution of the temperature in the upper crust is obviously different from that in the lower crust in most part of the region. But the horizontal distribution of the heat flow is constant in the crust. There is a belt where the thermal structure of the crust is intensely changed around Tangshan. There are some different characteristics of the thermal stress of the crust around Tangshan, in the North-China plain, in the Bohai Sea gulf, and in the middle part of the Bohai Sea. Utilizing those results, the distribution features of the seismic activity in the region were explained in this paper. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,14, 29–35, 1992. This project is supported by the Chinese Joint Seismological Science Foundation.  相似文献   

阿尔金山斜坡的深部电性结构及推覆构造          下载免费PDF全文

王信和  唐明光 《地质科学》1992,(4):317-324

在柴达木盆地西部边缘的阿尔金山斜坡带上进行了16个测点的大地电磁测深工作。反演结果表明,测区的电性结掏具有明显的南北分区特征。南部表现为低阻特征,与盆地内部相似;北部具有明显的高阻特征。根据电性与地层的追溯对比,结合钻孔与地质资料推测,在柴达木盆地西部的阿尔金山斜坡带上存在由北向南的推覆构造,下古生界和元古界地层推覆在中、新生代地层之上。推覆体宽度和推覆距离均超过10km。  相似文献   

乌苏里地区构造新探索   总被引：15，自引：0，他引：15  

邵济安  王成源等 《地质论评》1992,38(1):33-39

通过乌苏里地区中苏合作对比研究，对该区的构造有了以下一些新的认识：若干地体的拼贴奠定了东北亚大陆边缘的构造格局，地体的拼贴在时空上是有规律可寻的，这一规律解释了地槽学说对该区构造解释中的疑难问题。通过那丹哈达－比金地体外来岩块的地层对比，建立了一套完整的层序，在利恢复地体漂泊的历史。通过对比还发现苏联远东溪海地区和中国延吉地区可能同是不凯地体二叠纪的活动大陆边缘，三叠纪也经历了共同的演化历史。  相似文献   

云南楚雄台水管倾斜仪潮汐因子变化与澜沧—耿马地震     

唐吉阳 《四川地震》1992,(3):35-40

本文对楚雄台水管倾斜仪1986年～1988年观测的数据,用莱柯拉兹方法初步进行了潮汐波分析。并对可能与澜沧—耿马地震有联系的异常情况进行了论述。  相似文献   

Flow against dispersion in two-dimensional regions   总被引：1，自引：0，他引：1  

Mustafa M. Aral  Yi Tang 《Journal of Hydrology》1992,140(1-4):261-277

In field applications, upstream spreading of contaminant plumes may be controlled by the flow of fresh water in a direction opposite to the dispersive expansion direction of the plume. In the current literature this type of control is identified as flow against dispersion or contrary flow. In this study analytic methods are used to investigate contrary flow conditions for two-dimensional applications. In particular, special attention is given to the dispersive spread of the contaminant plume in the transverse direction under equilibrium flow against dispersion. Typical problems analyzed emphasize the effect of adsorption and transverse dispersion on the overall control process. Problems analyzed indicate that equilibrium flow velocities deduced from one-dimensional analysis, which may balance the dispersive spread of the plume in the longitudinal direction, represent an over design condition when these equilibrium velocities are compared with the conditions generated from a two-dimensional model for a downstream source which is finite in the transverse direction.  相似文献   

黄河三角洲水冰险情预警信息系统设计与分析应用探讨     

狄小春  励惠国  陈峰  唐新桥  宫汝俊  田志刚 《遥感学报》1990,(3)

本文探讨了黄河三角洲地区水冰灾情信息系统的建立方法及其应用问题。介绍了该系统的设计原则,数据结构,建立方法和程序,并对其应用进行了分析研究。该方法也适用于其它区域。  相似文献