地质和岩土工程光纤传感监测技术综述   总被引：3，自引：0，他引：3  

隋海波  施斌  张丹  王宝军  魏广庆  朴春德 《工程地质学报》2008,16(1):135-143

光纤传感器与常规传感器相比具有很大的优越性,已经成为地质和岩土工程监测领域中的研究热点。本文介绍了光纤传感监测系统的种类、基本测量原理和目前国内外的研究发展状况,并对各种传感技术的性能和特点进行了比较,指出了光纤传感监测技术应用于地质和岩土工程监测尚需研究的相关课题。  相似文献   

中国东部中新生代盆地成因及其地球动力学   总被引：9，自引：1，他引：9  

孙加鹏  杨宝俊 《世界地质》1997,16(3):1-6

中国东部大兴安岭－太行山－武陵山重力梯度带一线以东至太平洋西岩，大陆连缘中新生代盆地系的形成，中生代岩浆活动，盆地基本特征同Ｍｏｈｏ、岩石圈和软流圈及上地幔基本特征的内在联系等都表明，它们在时空和成因上有一定联系，可以纳入同一地球动力学过程之中，这种动力学机制可能与岩石圈界，地壳底界的拆离作用有关。  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   

Trends and multi‐annual variability of water temperatures in the river Danube,Serbia          下载免费PDF全文

Biljana Basarin  Tin Lukić  Dragoslav Pavić  Robert L. Wilby 《水文研究》2016,30(18):3315-3329

The relationship between air (Ta) and water temperature (Tw) is very important because it shows how the temperature of a water body might respond to future changes in surface Ta. Mean monthly Tw records of three gauging stations (Bezdan, Bogojevo i Veliko Gradi?te) were analysed alongside mean monthly discharge (Q) for the same stations. Additionally, Ta series from two meteorological stations (Sombor and Veliko Gradi?te) were correlated with Tw variations over the period 1950–2012. Locally weighted scatter point smoothing (LOWESS) was used to investigate long‐term trends in the raw data, alongside the Mann–Kendall (MK) trend test. Trend significance was established using Yue–Pilon's pre‐whitening approaches to determine trends in climate data. Also, the rescaled adjusted partial sums (RAPS) method was used to detect dates of possible changes in the time series. Statistically significant warming trends were observed for annual and seasonal minimum and maximum Tw at all investigated sites. The strongest warming was observed at Bogojevo gauging station for seasonal maximum Tw, with +0.05 °C per year on average. RAPS established that the trend began in the 1980s. This behaviour is linked to climate patterns in the North and East Atlantic which determine the amount of heat advected onto mainland Europe. Statistically significant correlations were found for all Tw on an annual basis. Overall, the strongest correlations (p < 0.01) between Tw residuals and the North Atlantic Oscillation (NAO) were recorded for the winter period. These findings suggest possible predictability of Tw over seasonal time‐scales. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

Research on comprehensive carrying capacity of Beijing–Tianjin–Hebei region based on state-space method     

Baojun Tang  Yujie Hu  Huanan Li  Dongwei Yang  Jiangpeng Liu 《Natural Hazards》2016,84(1):113-128

Based on state-space method and component analysis, this paper builds a comprehensive evaluation system of carrying capacity for the Beijing–Tianjin–Hebei region from four aspects, namely economy, environment, ecology and energy. The results show that the comprehensive carrying capacity in this region gradually rises in recent years and the economic carrying capacity plays an important role in this situation. Ecological and environmental carrying capacity are gradually enhanced but still affected by water shortages. The energy carrying capacity of this region is low, which is the major factor restricting its sustainable development. Based on the empirical results, following policy suggestions should be adopted: Firstly, local government should accelerate technological progress, promoting the optimization and upgrading of industrial structure; Secondly, the contradiction between supply and demand of water resource should be solved gradually; thirdly, government should develop recycling economy, realizing the coordinated development of economy and environment; last but not least, saving energy and improving energy efficiency.  相似文献   

Effects of initial step height on the headcut erosion of bank gullies: a case study using a 3D photo-reconstruction method in the dry-hot valley region of southwest China   总被引：1，自引：0，他引：1  

Baojun Zhang  Zhengan Su  Dan Yang  Yifan Dong  Liang Xiao 《自然地理学》2016,37(6):409-429

Abstract

Headcut erosion has been recognized as one of the main processes involved in gully development in the dry-hot valley region of southwest China. To examine the effect of initial step height on headcut erosion processes, three headcuts were constructed ranging in height from 0.75 to 1.25 m on an active bank gully head, and a series of scouring experiments were conducted under a flow discharge of 120 L min^?1. The morphological evolutions of the plunge pools and soil loss volume were estimated by three-dimensional photo-reconstruction methods (3D-PR). As the step height increased, the experimental results showed that: (1) the transformed potential energy and shear stress would increase by approximately 4.89 J s^?1 and 26.4 Pa on average when the step height increased 0.25 m; (2) the mean depth and width of the plunge pool exhibited obvious growth, and the morphology of the cross-section developed from approximately V-shaped to U-shaped; and (3) soil loss volume increased logarithmically, with total soil loss volumes of 0.076, 0.105 and 0.116 m³, respectively. Although the significant effects of the initial step height on headcut erosion were verified, further quantitative studies are required to quantify the mechanism of headcut erosion, especially for plunge pool erosion.  相似文献   

Timing of mineralization at the Shihu gold deposit in the middle segment of the Taihang Mountain,China     

Chao Chen  Shuyin Niu  Fang Wang  Fuxiang Zhang  Qinglian Zhang  Baojun Ma  Aiqun Sun  Jianzhen Zhang  Yaqi Cao  Xiaoqing Zhang 《中国地球化学学报》2018,37(1):80-89

The Shihu gold deposit, located in the middle-south section of the core of the Fuping mantle branch structure, is hosted in the Archean Fuping Group and adjacent to the quartz diorite porphyrite. The gold deposit is the only large gold deposit with reserves of more than 30 tons gold discovered in western Hebei Province so far. In order to constrain the timing of mineralization of this ore deposit, this paper focuses on the isotopic dating of zircon and pyrite. Zircons in gold-bearing quartz veins are magmatic in origin and no hydrothermal zircon has been found in such quartz veins, indicating that zircons were derived from the wall rocks. U–Pb ages of zircons fall mainly in the two domains: 2492 ± 82 and 136 ± 4 Ma, respectively, indicative of the contribution of the Fuping-Group TTG gneiss and Yanshanian igneous rocks, respectively. The Re–Os isotopic compositions of pyrites in the gold-bearing quartz veins yield an isochron age of 127 ± 31 Ma. Combined with other dating results, we suggest that the main metallogenic age of the Shihu gold deposit is 120–127 Ma.  相似文献   

深层地震资料采集的若干问题     

杨宝俊  刘财  王功先  杨有发  王晓春  勾永锋  孙树森 《吉林大学学报(地球科学版)》1989,(2)

本文着重叙述检波器组合效应、最大炮检距的选择、深反射层的共反射点离散效应等项技术和问题。另外讨论了比较理想的深层资料采集方法。  相似文献   

1990 年京津冀三次暴雨的分析   总被引：5，自引：1，他引：5       下载免费PDF全文

刘延英  许晨海 《应用气象学报》1993,4(3):349-355

本文分析了1990年京津冀地区三次暴雨过程，结果发现:（1）三次暴雨是属于相伴有冷锋的高空槽影响的暴雨；（2）暴雨开始前约10小时雨区的西南方存在湿有效能量高能舌，高能舌的西方和北方有能量和水汽的积聚；（3）对流层低层的锋生和地形对气流的抬升作用是触发暴雨开始的直接原因。  相似文献   

地震勘探频率中近抛物线型衰减的物理解释     

杨宝俊  张伯军  杨友发  余迪钧 《吉林大学学报(地球科学版)》1990,(3)

几十年来,人们对地震波在真实介质中传播发生的衰减进行了理论与实践两方面研究。文中综述了前人工作,包括机制与测试工作,同时给以评论,指出对于传播距离与频率之间关系研究不够,并且对实测结果作物理解释较少。作者用VSP技术进行了不同距离上衰减与频率之间关系的研究,提出了反射补偿的具体方法,采用了多项式拟合技术,得到了近抛物线型衰减的结果。然后,利用波前压力与振动的固有频率思想对测试结果进行了讨论,得出一些有益的结论。  相似文献