基于点目标分析的InSAR技术检测地表微小形变的研究   总被引：1，自引：0，他引：1  

廖明生  卢丽君  王艳  李德仁 《城市地质》2006,1(2)

近年来,由合成孔径雷达干涉测量技术(InSAR)技术发展而来的时间序列影像点目标分析技术已发展成为大范围地提取地表微小形变信息的关键技术。本研究针对地表形变检测中经常出现的时间、空间去相干问题和大气效应等问题,从常规的合成孔径雷达差分测量技术(D-InSAR)入手,深入探讨了以永久散射体(PSI)和相干目标分析(CTA)方法为代表的点目标分析技术原理和方法,阐述了它们的特点和优势。最后,介绍了CTA方法对提取长时间地表形变场的具体应用实例,说明其方法的有效性和可靠性。  相似文献   

Timing and mechanism of reservoir forming in the Upper Triassic Halahatang Formation,Yuqi block,Tarim Basin,northwestern China     

Lixiong Kuang  Hao Zheng  Mingyan Wang  Taizhu Huang  Chensheng Liu 《Marine and Petroleum Geology》2010

The Yuqi block is an important area for oil and gas exploration in the northern Akekule uplift, Tarim Basin, northwestern China. The Upper Triassic Halahatang Formation (T₃h) within the Yuqi block can be subdivided into a lowstand system tract (LST), a transgressive system tract (TST), and a highstand system tract (HST), based on a study of initial and maximum flood surfaces. Oil in the lowstand system tract of the Halahatang Formation is characterized by medium to lightweight (0.8075 g/cm³–0.9258 g/cm³), low sulfur content (0.41%–1.4%), and high paraffin content (9.65%–10.25%). The distribution of oil and gas is principally controlled by low-amplitude anticlines and faults. Based on studies of fluorescence thin sections and homogenization temperatures of fluid inclusions, reservoirs in the T₃h were formed in at least two stages of hydrocarbon charge and accumulation. During the first stage (Jurassic–Cretaceous) both the structural traps and hydrocarbon reservoirs were initiated; during the second stage (Cenozoic) the structural traps were finally formed and the reservoirs were structurally modified. The reservoir-forming mechanism involved external hydrocarbon sources (i.e. younger reservoirs with oil and gas sourced from old rocks), two directions (vertical and lateral) of expulsion, and multi-stage accumulation. This model provides a theoretical fundament for future oil and gas exploration in the Tarim Basin and other similar basins in northwestern China.  相似文献   

Research progress and prospects of digital restructuring of global-local interactions北大核心CSCD     

Kuang A.  Wang M.  Zhang Y. 《地理科学进展》2023,(2):380-391

Global-local interaction is an important research topic in economic geography. In recent years, the rapid development of digitalization in various countries and regions has profoundly affected the global production and trade networks. However, there is a lack of systematic theoretical discussion on digitalization and global-local interaction studies. The objective of this study is to conceptually rethink the role of digitalization in reshaping global-local interactions from a dynamic and relational perspective. To do this, the study first systematically reviewed the digital turn in economic geography and discussed the rethinking of digitalization. It is found that the understanding of digitalization is gradually moving beyond the limits of isolated, static, and passive technocentric approaches and towards a more dynamic, relational, and open perspective. Second, the study combined the "digital turn" with the "relational turn" in relational economic geography, which constructs theoretical bridges between digitalization and global-local studies. Third, this study provided a basic understanding for sorting out the evolution of the research frameworks, that is, from the global value chain (GVC) to the global production network (GPN) and then to the digital ecosystem (DE). We argued that digitalization has been deeply involved in shaping the global economic landscape, restructuring global-local production relations, and reconstructing regional development. Based on this recognition, we discussed the primary performance of digitalization on the restructuring of global-local interaction from three aspects: enterprise relationship, spatial effect and interaction mechanism. Finally, grounded in the practice of China's urban and regional digital economy development, the possible theoretical innovations and prospects for future research on digitalization and global-local interaction in the Chinese context were proposed. The study pointed out that we can integrate the regional practices of China's digital development with more in-depth research from the perspectives of the platform ecosystems, spatial effects, location analysis, local development models, and so on in future research. © 2023, Editorial office of PROGRESS IN GEOGRAPHY. All rights reserved.  相似文献   

1986—2021年国家自然科学基金资助大气科学研究35年     

匡钰  王卓妮 《气象科学进展》2022,(1)

中国基础科学全面发展的一个重要标志,是1986年国家自然科学基金委员会的建立。从该年开始,基金委地学部开始资助大气科学基础研究项目。截至2021年,35年来,基金委以研究项目的遴选、资助和评估等过程为推动,不仅促成了我国大气科学研究的持续进步,更形成了一支核心研究机构和队伍。自然科学基金大气科学类项目立项呈现持续增加态势立项数量的增加出现两个快速增加的台阶:一是2000年开始。  相似文献