发挥遥感技术优势,为安徽省经济建设服务——以“安徽省国土资源遥感综合调查”项目为例     

黄方才  杨则东 《安徽地质》1997,(1)

本文论述了应用遥感技术，对安徽省国土资源进行综合调查的具体方法、步骤和组织实施的全过程。文中对课题、专题设置及其调查内容，取得的主要成果进行了评述和介绍。本文是省（区、市）级国土资源遥感综合调查具体实践的经验总结  相似文献   

Regionalization of unit hydrograph parameters: 1. Comparison of regression analysis techniques     

Y. -K. Tung  K. -C. Yeh  J. -C. Yang 《Stochastic Environmental Research and Risk Assessment (SERRA)》1997,11(2):145-171

Hydrologic regionalization is a useful tool that allows for the transfer of hydrological information from gaged sites to ungaged sites. This study developed regional regression equations that relate the two parameters in Nash's IUH model to the basin characteristics for 42 major watersheds in Taiwan. In the process of developing the regional equations, different regression procedures including the conventional univariate regression, multivariate regression, and seemingly unrelated regression were used. Multivariate regression and seeming unrelated regression were applied because there exists a rather strong correlation between the Nash's IUH parameters. Furthermore, a validation study was conducted to examine the predictability of regional equations derived by different regression procedures. The study indicates that hydrologic regionalization involving several dependent variables should consider their correlations in the process of establishing the regional equations. The consideration of such correlation will enhance the predictability of resulting regional equations as compared with the ones from the conventional univariate regression procedure.  相似文献   

Regionalization of unit hydrograph Parameters: 2. Uncertainty analysis     

K. -C. Yeh  J. -C. Yang  Y. -K. Tung 《Stochastic Environmental Research and Risk Assessment (SERRA)》1997,11(2):173-192

Hydrologic model parameters obtained from regional regression equations are subject to uncertainty. Consequently, hydrologic model outputs based on the stochastic parameters are random. This paper presents a systematic analysis of uncertainty associated with the two parameters, N and K, in Nash's IUH model from different regional regression equations. The uncertainty features associated with N and K are further incorporated to assess the uncertainty of the resulting IUH. Numerical results indicate that uncertainty of N and K from the regional regression equations are too significant to be ignored.  相似文献   

Barotropic local instability and severe storm process     

Dasheng Yang  Lan Sun 《中国科学D辑(英文版)》1997,40(3):259-268

By means of barotropic model, the characteristic and initial value problems are investigated to reveal the local two-dimensional barotropic instability of the nonuniform current to the dynamic mechanism of the formation of the Yangtze-Huaihe River severe storm in July 1991. Analytical theory and numerical experiment show that (i) the unstable developing modes are chiefly the two periods of about 44 d and 10 d, which are fundamentally consistent with that of the precipitation change of the Yangtze-Huaihe River. (ii) The growth rate of the local perturbation is dominated by the meridional wave numbern = 1–5 and zonal wave numberk = 1–12, i.e. the severe storm over the Yangtze-Huaihe River results from the interaction of the systems at different latitudes and waves of different scales, (iii) The perturbation over the Yangtze-Huaihe River possesses the property of local intensification, which slowly migrates westward over the lower and middle reaches of the Yangtze-Huaihe River. (iv) The growth rate of the instability, especially the propagation velocity of the perturbation, is sensitive to the external parameters ū and α. Project supported by the National Natural Science Foundation of China.  相似文献   

Properties of wave velocity for two types of granitoids at high pressure and temperature and their geological meaning   总被引：1，自引：0，他引：1  

Shufeng Yang  Hanlin Chen  Jishuang Jiang  Guoqiang Zhu  Hongshen Xie  Wei Hou  Yueming Zhang  Huigang Xu 《中国科学D辑(英文版)》1997,40(5):470-476

The wave velocity for two types of granitoids was measured using the analytic method of full-wave vibration at high pressure and high temperature. The laws of velocity changes for them differ with the pressure boost and temperature rise, and the velocity change of S-type is more violent than that of I-type. The “softening point” of compressional wave velocity (V μ) is also revealed during the measurement for two types of granitoids imitating the pressure and temperature at a certain depth. But the depth of “softening”, V_p after “softening” and the percentage of V_p’s drop around the “sofrening point” for two types of granitoids are obviously different. The depth of “softening” is 15 km approximately and V_p after “softening” is 5.62 km/s for S-type granitoid. But for I-type granitoid the depth of “softening” is 26 km approximately and V_p after “softening” is 6. 08 km/s. Through careful analysis of rock slices after the experiment, it was found that the “softening” of elastic-wave velocity is caused by the partial melting of granite. Combined with the results of geophysical prospecting, these results suggest that the low-velocity layers developing in the interior of Earth crust are related to thc partial melting of different types of granitoids. The formation of the low-velocity layer in the upper-middle Earth crust is closely related to the development of S-type granitoid, but that in the lower Earth crust is closely related to the development of I-type granitoid.  相似文献   

Evolution model and formation mechanism of bio-thermocatalytic transitional zone gas   总被引：1，自引：0，他引：1  

Wenhui Liu  Yongchang Xu  Jiyang Shi  Huaiyan Lei  Baisheng Zhang 《中国科学D辑(英文版)》1997,40(1):43-53

As a new genetic type of natural gas exploration area, the bio-thermocatalytic transitional zone gas (BTTZG) has been highly stressed by geologists both at home and abroad. Systematic study on the generation mechanism of hydrocarbon at the transitional zone is presented. Based on simulating experiments and geochemistry analysis of the source rock with lower evolution, a hydrocarbon-forming model at the transitional zone has been established. The mechanism is proposed that under the condition of low temperature and pressure combining with extremely active structural stress and clay mineral catalysis, BTTZG is formed by de-group of soluble organic matter and polarized compositions through orthocarbon ion as well as by condensation polymerization of aromatic ring-rich insoluble organic matter. This mechanism controls the formation of BTTZG, and furthermore, BTTZG is the product of superimposition and interaction of all the factors mentioned above.  相似文献   

Regionalization of unit hydrograph Parameters: 2. Uncertainty analysis     

K. -C. Yeh  J. -C. Yang  Y. -K. Tung 《Stochastic Hydrology and Hydraulics》1997,11(2):173-192

Hydrologic model parameters obtained from regional regression equations are subject to uncertainty. Consequently, hydrologic model outputs based on the stochastic parameters are random. This paper presents a systematic analysis of uncertainty associated with the two parameters, N and K, in Nash's IUH model from different regional regression equations. The uncertainty features associated with N and K are further incorporated to assess the uncertainty of the resulting IUH. Numerical results indicate that uncertainty of N and K from the regional regression equations are too significant to be ignored.  相似文献   

黄河上游径流预报的灰色拓扑方法   总被引：5，自引：6，他引：5  

蓝永超  杨文华 《冰川冻土》1997,19(4):308-311

以龙羊峡水库年平均入库流量预报为例，根据灰色系统理论的建模方法，利用龙羊峡水库入库水量代表站唐乃亥水文站的实测径流资料，建立了一个ＧＭ（１，１）拓扑预测模型，用于黄河上游径流的长期预报，并取得了较为满意的结果。  相似文献   

关于大陆与陆缘的深部地震探查的进展──1994、1996年两届国际学术讨论会综述     

杨宝俊  杨平华  李春华 《吉林大学学报(地球科学版)》1997,(2)

连续两届国际深部地震讨论会成果累累。对深部地震的资料采集、处理、解释技术以及几类专门地质地球物理问题的研究进行了综述。研究成果在理论、方法方面是该领域的世界先进水平：在地震学应用于陆缘、陆壳与壳幔过渡带等地质问题方面有明显的提高。提出了值得讨论的问题，最后探讨了发展趋势  相似文献   

鹤岗盆地晚侏罗世石头河子组沉积环境及幕式聚煤作用   总被引：3，自引：0，他引：3  

杨子荣  姜剑虹 《沉积学报》1997,15(3):55-61

鹤岗盆地是一中-新生代内陆盆地，主要含煤地层上侏罗统石头河子组是一套非海相含煤地层，充填于盆地底部，自下而上可划分为三个岩性段，五个亚段和２６个含煤旋回。底部第一亚段沉积期以冲积扇、辫状河环境为主；第二亚段以河流环境为主；第三亚段以河流-三角洲-湖泊环境为主；第四亚段演化为河流环境；第五亚段则以河流、冲积扇环境为主。垂向上五个亚段对应于盆地的填平补齐-扩张-稳定沉降-差异沉降-收缩五个演化阶段。富煤带位于同沉积中心的侧翼，一般含砂率６０%～７０%的区域含煤性最好。含煤旋回受控于盆地周期性地快-慢沉降，聚煤作用发育于每期幕式沉降的缓慢稳定沉降阶段。厚-特厚煤层都与湖泊三角洲冲积平原大面积沼泽化有关。  相似文献