辽北张强地区燕山期以来主要构造运动期最大主应力的测定   总被引：8，自引：1，他引：7  

孙宝珊  任德生 《地质论评》2000,46(1):91-98

辽北张强地区晚侏罗世以来经历了４期主要构造运动：燕山早中、晚中、晚期和喜马拉雅晚期,通过声发射（ＡＥ）法测得相应４期的最大主应力值分别为１０６．２ＭＰａ、８７．３ＭＰａ、５７．１ＭＰａ、３３．４ＭＰａ,同时还测得现今地应力最大主应力值为１７．４～２３．３ＭＰａ。发现有岩浆活动的构造运动期古应国在主应力值偏大。测量田内含油构造和出油井现今地应力最大主应力值偏低。本区油气成藏期古应力状态的最大主应力值  相似文献   

中国城市交通运输发展水平等级差异变动特征   总被引：7，自引：1，他引：6  

曹小曙  张利敏  薛德升  王大鹏 《地理学报》2007,62(10):1034-1040

选取中国183 个城市的1991 年、1995 年、1999 年和2003 年4 个时间段的统计数据, 在Arcmap 软件中采用自然断裂法进行等级划分, 将城市交通运输总体发展水平的等级划分为5 级, 利用SPSS 统计分析软件进行分析, 得到1991-2003 年中国城市交通运输发展水平等级差异变动特征: 中国城市交通运输发展水平等级呈现明显的“纺锤形”结构, 交通运输发展水平明显高于平均发展水平的城市个数和明显低于平均发展水平的城市个数所占比例低于32%, 68%以上的城市其交通运输发展水平接近全国平均水平; 发展水平较高的城市在以省区为单位的空间分布上呈现集中-分散-分散-集中的特征, 而等级较低的城市在空间上呈现分散无规则分布格局; 中国城市交通运输发展水平的等级差异呈现“U” 形变化, 1991- 1995 年差距逐渐缩小, 1995-1999 年差距逐渐增大, 1999-2003 年差距逐渐缩小, 但各时间段内的变动幅度不大; 城市交通运输发展水平上升的城市在空间分布上集中于河南、山东、江苏等省, 城市交通运输发展水平下降的城市集中于黑龙江、吉林、陕西、湖北和湖南等省。  相似文献   

山西五台山太古宙绿岩带金矿成矿系统初论     

陈平  苗培森  李德胜  李效广  田永清  李晓峰  余克忍  李春电  武胜  王春亮  郝书青  段礼锁 《华北地质》1999,(3)

山西五台山太古宙绿岩带同构选初生型金矿床发现三种类型：条带状铁建造型。层控浸染型和含金石英脉型。这些类型的金矿床主要分布在五台山中央韧性剪切带一侧,具有太古宙绿岩带金矿的典型地质特征,可概括为火山喷气-变质热液叠加的层控矿床或再造的层控矿床,它们共同构成五台山太古亩绿岩带Fe-Au－CU矿床成矿系统。  相似文献   

离散行列方式图象预处理器的设计与应用     

傅德胜  李慧颖 《南京气象学院学报》1999,22(4):652-657

详细阐述了基于离散行列方式、具有广泛用途的图象预处理器的构造、算法原理及流水线设计,并给出了应用示例。  相似文献   

Study on Dynamic Characteristics of Crustal Deformation in the Yunnan Area Using GPS     

WANG Yan  SHAO Desheng  HONG Min 《中国地震研究》2019,33(3):478-488

Based on the GPS velocity field data of 1999-2007 and 2011-2013,we used the least squares configuration method and GPS velocity profile results to synthetically analyze the dynamic evolution characteristics of crustal deformation in the Yunnan area before and after the Wenchuan earthquake. The dynamic evolution of GPS velocity field shows that the direction is gradually changed from the south in the southern part of the Sichuan-Yunnan block to the south-west in the southern Yunnan block and there is a clear relative motion characteristic near the block boundary fault zone. Compared with the GPS velocity of 1999-2007, the results of 2011-2013 also reflect segmental deformation characteristics of the block boundary fault zone. Southeast movement shows a significant increase, which may be related to crustal deformation adjustment after the Wenchuan earthquake. The dynamic evolution of strain parameters shows a pattern of "extension in the middle and compression at both ends" in the whole area and the distribution of deformation (shear, extension or compression) is closely related to the background motion and deformation characteristics of the main fault zone. Compared with the results of the period of 1999-2007, the extensional deformation zone of 2011-2013 is expanded eastward and southward. The compressional deformation of the eastern boundary (the Xiaojiang fault zone) of the Sichuan-Yunnan block is no longer significant, which is mainly concentrated in the northern section of the Xiaojiang fault zone and may be related to the post-seismic deformation adjustment of the Wenchuan earthquake. The GPS velocity profile results show that the left-lateral slip velocity of the Xiaojiang fault zone reduced gradually from north to south (10mm/a-5mm/a), and the width of the northern section is wider. The right-lateral slip rate of the Honghe fault zone is about 4mm/a, and the deformation width is wider. The dynamic results show that the Wenchuan earthquake has little effect on the deformation modes of these two fault zones.  相似文献   

关于流水动力地貌及其实验模拟问题   总被引：5，自引：0，他引：5  

金德生 《地理学报》1989,44(2):147-156

流水动力地貌是地表水流运动过程与地球表层物质相互作用的产物，具有显著的环境效应。流水动力地貌学是界于流水动力学、泥沙力学及流水地貌学之间的新兴的富有生命力的边缘科学。运用基于牛顿力学相似论及系统论异构同功原理的物理模型可以有效地研究流水动力地貌特征、成因机制及作用过程。数学模拟与物理模型相互印证，开辟了一条富有发展前景的流水动力地貌研究途径。  相似文献   

德州市临盘采油区地面沉降监测   总被引：1，自引：1，他引：0  

王胜岭  宋波  王德生  尹训志 《山东国土资源》2009,25(1)

济南市的鹊山上设立了3块岩层水准标石的原点组。使用美国Tri mble Di Ni 12电子水准仪和条码式铟钢水准标尺施测一等精密水准82.2 km,二等精密水准30.8 km,联测各类水准点35个。对观测结果进行统计与分析表明,在临盘采油区(以后仓西北采油四队LY18为中心)形成了一个较明显的沉降区域,年沉降量为54.3 mm。建议在其周边增埋地面观测标石,进行加密观测,以掌握其变化规律。  相似文献   

Remote sensing classification approach to large-scale crop cultivation identification: A case study of the Aral Sea Basin     

Zhuojian Wen  Desheng Jiang  Ye Jing  Guilin Liu 《Transactions in GIS》2023,27(8):2278-2296

Since the collapse of the Soviet Union, the crop cultivation structure in the Aral Sea Basin has changed dramatically, and these changes are worth studying. However, historical crop remote sensing mapping at the watershed scale remains challenging, especially crop misclassification at the cropland edge due to mixed pixels. Therefore, we proposed a field segmentation approach to constrain field edges based on time-series Sentinel-2 remote sensing images and the Google Earth Engine platform and then employed the random forest algorithm to perform crop classification based on time series Landsat/Sentinel-2 images and crop phenology information to produce historical crop maps in the Aral Sea Basin from the 1990s onward. The results showed that the intersection over union between the extracted field edges and in situ-measured field size data was 0.65. The overall accuracy of crop mapping was 95.2% in 2019. Then, we extended our method to historical mapping over the 1991–2015 period with accuracies ranging from 82.8% to 91.3%. Moreover, our method applied to historical mapping works well in terms of accuracy and policy matching. These findings indicate that our method can accurately distinguish cropland edges to reduce classification errors due to mixed pixels. This method is promising for solving the cropland edge problem for historical crop mapping in the Aral Sea Basin and can potentially provide a reference for historical crop classification in other watersheds of the world.  相似文献