断层氢气观测技术实验     

谢恒义  李源  夏修军  孙召华 《地震地磁观测与研究》2018,39(4):176-182

采用ATG-6118H痕量氢在线自动分析仪，在朱夏-商丹断裂带南阳地区布设独山、马山口2个氢气观测台，研究设备取气深度、抽气时间设置长短对观测断层氢气浓度的影响，从而为利用痕量氢设备进行断层氢气观测提供参考依据。实验结果表明：①取气深度越浅，观测到的氢气浓度越高，日变化幅度越大；②集气管内氢气浓度偏低时，抽气时间设置略高于导气管路排空时间，氢气浓度明显变化，否则变化不明显。  相似文献   

Spatiotemporal changes of epidemics and their relationship with human living environments in China over the past 2200 years     

Gong  Shengsheng  Xie  Haichao  Chen  Fahu 《中国科学:地球科学(英文版)》2020,63(8):1223-1226

正Epidemics are biological disasters resulting from the widespread occurrence of acute and severe infectious diseases that are normally caused by viruses, bacteria and parasites.They are amongst the most destructive of all natural disasters suffered by humans (Gong, 2019). The pathogens that cause epidemics have always existed in nature, understanding the spatiotemporal distribution of past epidemics is important for preventing and controlling future epidemics.  相似文献   

移动荷载对桥梁动力响应的影响研究——以开裂预应力混凝土简支梁为例     

谢颖川  高静  刘长玲  刘迪 《震灾防御技术》2020,15(3):510-518

混凝土桥梁在工作过程中会产生裂缝，为分析移动荷载对开裂混凝土桥梁结构刚度的影响，对开裂梁动力响应进行分析。建立简支T梁桥有限元模型，并将移动荷载施加至有限元模型中。根据简支T梁桥破坏横向分布位置和强度的不同，研究不同工况下各梁荷载横向分布及不同移动速度对裂缝扩展宽度的影响。结果表明，数值模拟结果能较好地验证计算模型的准确性；在较大的移动荷载作用下，混凝土开裂，导致结构刚度减小、位移增大；随着移动荷载和速度的增加，开裂时间增加，结构刚度降低，持续时间增加，位移增大，使结构响应呈现明显非线性。  相似文献   

Dynamic mechanisms controlling the topography of Longmenshan area   总被引：1，自引：0，他引：1  

Xie  Yuan  Li  Yongdong  Xiong  Xiong 《中国科学:地球科学(英文版)》2020,63(1):121-131

The Longmenshan fault, which defines the eastern edge of the Tibetan Plateau, is one of the steepest margins of the plateau with a sharp elevation drop of about 4 km over a distance less than 100 km across the Longmenshan fault. The mechanism which is responsible for controlling and maintaining the elevation difference is highly debated. Using multiple observations including seismic velocity model, Moho depth, effective elastic thickness of the lithosphere, we conducted a quantitative study for elucidating the contributions from crust and lithospheric mantle by an integrated analysis of lithospheric isostasy and flexure. It is shown that the topography of the Longmenshan fault is supported by both lithospheric isostasy and flexure statically, and lower crustal channel flow and mantle convection dynamically. Different mechanisms have different weights for contribution to the topography of the Songpan-Ganzi block and the Sichuan Basin. The static and dynamic support contribute roughly the same to the topographic difference of ~4 km between the two sides of the Longmenshan fault. The static topographic difference of ~2 km is mainly resulted from the lithospheric isostasy, while the dynamic one of ~2 km is contributed by the uprising of the accumulated material in the lower crust beneath the Songpan-Ganzi block and the downward drag force caused by the upper mantle convection under the Sichuan Basin. It is thus suggested that the lower crustal flow and upper mantle convection are dynamic forces which should be taken into account in the studies on the dynamics in the Longmenshan and surrounding regions.  相似文献   

A brief review of ENSO theories and prediction     

Xianghui FANG  Ruihuang XIE 《中国科学:地球科学(英文版)》2020,63(4):476-491

Although the El Ni?o-Southern Oscillation(ENSO) originates and develops in the equatorial Pacific, it has substantial climatic impacts around the globe. Thus, the ability to effectively simulate and predict ENSO one or more seasons in advance is of great societal importance, but this remains a challenging task. The main obstacles are the diversity, complexity,irregularity, and asymmetry of ENSO. The purpose of this article is to organically integrate the understanding of ENSO based on current progress on the physical mechanisms, prediction, and connections between the interannual ENSO phenomenon and physical processes on other time and space scales, and to provide guidance for future studies by extracting specific important questions.  相似文献   

Succession of the Nanoplankton Community during a Brown Tide in a Scallop Culture Area in China     

Qiao  Ling  Yu  Jie  Li  Ying  Guo  Haobing  Zhen  Yu  Zhang  Lingling  Mi  Tiezhu  Zhang  Fuchong  Bao  Zhenmin 《Ocean Science Journal》2019,54(3):375-392

Ocean Science Journal - Brown tides caused by Aureococcus anophagefferens have occurred frequently in the coastal waters of Qinhuangdao since 2009. The Changli coast is the area most strongly...  相似文献   

2015年台风“彩虹”过境后下山冷急流引起的南海北部海域异常海面降温   总被引：1，自引：0，他引：1  

石雨鑫  谢玲玲  郑全安  张书文  李明明  李君益 《海洋学报(英文版)》2019,38(5):62-75

This study deals with a unusual cooling event after Typhoon Mujigea passed over the northern South China Sea(SCS) in October 2015. We analyze the satellite sea surface temperature(SST) time series from October 3 to 18,2015 and find that the cooling process in the coastal ocean had two different stages. The first stage occurred immediately after typhoon passage on October 3, and reached a maximum SST drop of –2℃ on October 7 as the usual cold wake after typhoon. The second stage or the unusual extended cooling event occurred after 7d of the typhoon passage, and lasted for 5d from October 10 to 15. The maximum SST cooling was –4℃ and occurred after 12d of typhoon passage. The mechanism analysis results indicate that after landing and moving northwestward to the Yunnan-Guizhou Plateau(YGP), Typhoon Mujigea(2015) met the westerly wind front on October 5. The lowpressure and positive-vorticity disturbances to the front triggered meridional air flow and low-pressure trough,thus induced a katabatic cold jet downward from the Qinghai-Tibet Plateau(QTP) passing through the YGP to the northwestern SCS. The second cooling reached the maximum SST drop 4d later after the maximum air temperature drop of –9℃ on October 11. The simultaneous air temperature and SST observations at three coastal stations reveal that it is this katabatic cold jet intrusion to lead the unusual SST cooling event.  相似文献   

Preface to the special issue “Tectonics and depositional infilling of western Pacific marginal sea”     

Xie  Xinong  Huang  Chi-Yue  Shao  Lei 《Marine Geophysical Researches》2019,40(2):97-98

Marine Geophysical Research -  相似文献   

Use of four drought indices for evaluating drought characteristics under climate change in Shaanxi,China: 1951–2012     

Rengui Jiang  Jiancang Xie  Hailong He  Jungang Luo  Jiwei Zhu 《Natural Hazards》2015,75(3):2885-2903

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Compressibility and equation of state of beryl (Be3Al2Si6O18) by using a diamond anvil cell and in situ synchrotron X-ray diffraction     

Dawei Fan  Jingui Xu  Yunqian Kuang  Xiaodong Li  Yanchun Li  Hongsen Xie 《Physics and Chemistry of Minerals》2015,42(7):529-539

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