A public Cloud-based China’s Landslide Inventory Database (CsLID): development,zone, and spatiotemporal analysis for significant historical events, 1949-2011     

Wei-yue Li  Chun Liu  Yang Hong  Xin-hua Zhang  Zhan-ming Wan  Manabendra Saharia  Wei-wei Sun  Dong-jing Yao  Wen Chen  Sheng Chen  Xiu-qin Yang  Yue Yue 《山地科学学报》2016,13(7):1275-1285

Landslide inventory plays an important role in recording landslide events and showing their temporal-spatial distribution. This paper describes the development, visualization, and analysis of a China's Landslide Inventory Database (CsLID) by utilizing Google’s public cloud computing platform. Firstly, CsLID (Landslide Inventory Database) compiles a total of 1221 historical landslide events spanning the years 1949-2011 from relevant data sources. Secondly, the CsLID is further broken down into six zones for characterizing landslide cause-effect, spatiotemporal distribution, fatalities, and socioeconomic impacts based on the geological environment and terrain. The results show that among all the six zones, zone V, located in Qinba and Southwest Mountainous Area is the most active landslide hotspot with the highest landslide hazard in China. Additionally, the Google public cloud computing platform enables the CsLID to be easily accessible, visually interactive, and with the capability of allowing new data input to dynamically augment the database. This work developed a cyber-landslide inventory and used it to analyze the landslide temporal-spatial distribution in China.  相似文献   

20世纪40年代初以来中国大陆沿海主要海湾形态变化   总被引：11，自引：1，他引：10  

侯西勇  侯婉  毋亭 《地理学报》2016,71(1):118-129

受气候变化和人类活动的影响,中国海岸带正在经历各种剧烈的变化,海湾形态变化是其中的一个重要方面.基于地形图资料与遥感影像提取20世纪40年代初至2014年7个时相的中国大陆沿海主要海湾的空间信息,进而分析海湾岸线类型结构,开发利用程度和空间位置的变化特征,以及海湾面积,形状和重心分布的变化特征.结果表明,20世纪40年代初以来,中国大陆沿海主要海湾的形态变化显著且复杂,主要体现为:海湾岸线的结构变化显著,自然岸线的长度和比例急剧减少;海湾岸线的开发利用程度持续增强;海湾岸线普遍背陆向海运动;海湾面积普遍大幅萎缩;海湾形状总体趋向复杂但个体间的差异在缩小;海湾重心分布位置普遍背陆向海迁移;海湾变化具有显著的时空差异性等.总的来说,以围填海为主的人类活动是导致海湾发生上述变化特征的主要原因.通过研究,指出应该对中国的海湾进行功能定位划分和分类管理,通过强化以海湾为基本单元的管理,促进中国海岸带综合管理能力的提高和管理目标的实现.  相似文献   

Estimating groundwater recharge based on mass balance evaluation of unsaturated zone in a coastal catchment characterized by tropical rainforest weather conditions     

Seyed Reza Saghravani  Ismail Yusoff  Wan Zakaria Wan Md Tahir  Zainudin Othman 《Environmental Earth Sciences》2016,75(8):668

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Spatial and temporal precipitation variability in the source region of the Yellow River     

Qiong Li  Meixue Yang  Guoning Wan  Xuejia Wang 《Environmental Earth Sciences》2016,75(7):594

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Risk hotspots for terrestrial plant invaders under climate change at the global scale     

Ji-Zhong Wan  Chun-Jing Wang  Fei-Hai Yu 《Environmental Earth Sciences》2016,75(12):1012

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The effects of clay minerals and organic matter on nanoscale pores in Lower Paleozoic shale gas reservoirs,Guizhou, China     

Yuantao Gu  Quan Wan  Wenbin Yu  Xiaoxia Li  Zhongbin Yu 《中国地球化学学报》2018,37(6):791-804

In organic-rich gas shales, clay minerals and organic matter (OM) have significant influences on the origin, preservation, and production of shale gas. Because of the substantial role of nanoscale pores in the generation, storage, and seepage of shale gas, we examined the effects of clay minerals and OM on nanoscale pore distribution characteristics in Lower Paleozoic shale gas reservoirs. Using the Niutitang and Longmaxi shales as examples, we determined the effects of clay minerals and OM on pores through sedimentation experiments. Field emission–scanning electron microscopy combined with low-pressure N₂ adsorption of the samples before and after sedimentation showed significant differences in pore location and pore size distribution between the Niutitang and Longmaxi shales. Nanoscale pores mostly existed in OM in the Longmaxi shale and in clay minerals or OM–clay composites in the Niutitang shale. The distribution differences were attributed largely to variability in thermal evolution and tectonic development and might account for the difference in gas-bearing capacity between the Niutitang and Longmaxi reservoirs. In the nanoscale range, mesopores accounted for 61–76% of total nanoscale pore volume. Considerably developed nanoscale pores in OM were distributed in a broad size range in the Longmaxi shale, which led to good pore connectivity and gas production. Numerous narrow pores (i.e., pores?<?20 nm) in OM–clay composites were found in the Niutitang shale, and might account for this shale’s poor pore connectivity and low gas production efficiency. Enhancing the connectivity of the mesopores (especially pores?<?20 nm and those developed in OM–clay composites) might be the key to improving development of the Niutitang shale. The findings provide new insight into the formation and evolutionary mechanism of nanoscale pores developed in OM and clay minerals.  相似文献   

U–Pb zircon age of the base of the Ediacaran System at the southern margin of the Qinling Orogen     

Lecai Xing  Taiyi Luo  Zhilong Huang  Zhikuan Qian  Mingzhong Zhou  Hongtao He 《中国地球化学学报》2018,37(3):414-421

Global abrupt climate change from Marinoan snowball Earth to greenhouse Earth, recorded as cap carbonate overlain on diamictite, had shed the first light on Cambrian bio-radiation. The most documented cap carbonate sections are typical with comprehensive δ¹³C negative values and ubiquitous sedimentary structures, such as tepee-like, sheet-crack etc., which are associated with successive glacial eustatic variation caused by isostatic rebound in shallow-water facies. Here we report a deep-water basinal cap carbonate section with strong negative δ¹³C values in the southern margin of the Qinling Orogen, Heyu, Chengkou County, Chongqing in China, which consists of massive dolostone with abundant carbonaceous laminae. However, it lacks the sedimentary structure as mentioned above and is overlain by thin-bedded silicious shales and cherts. A K-bentonite bed was discovered within the base of cap carbonates, about 0.7 m above the top of the Marinoan diamictite. Magmatic zircons that were separated from the K-bentonite bed yield a SIMS concordia U–Pb age of 634.1 ± 1.9 Ma (1σ, MSWD_CE = 0.31, Probability_CE = 1.000, n = 20). The age is in good agreement with previously reported TIMS U–Pb ages for the termination of Marinoan glaciation and provides a geochronological constraint for the Ediacaran successions in the Qinling Orogen.  相似文献   

新疆三塘湖盆地上石炭统近源凝灰岩致密油藏形成条件     

陈常超  黄志龙  陈旋  安成龙  王昕  李新宁 《地质通报》2018,37(1):83-92

三塘湖盆地上石炭统烃源岩是火山喷发环境下形成的,烃源岩往往与厚度不等的凝灰岩交互出现,但凝灰岩致密储层的厚度和物性差异较大,源储关系较复杂,因而近源凝灰岩致密油藏的形成需要特定的条件。为了认识三塘湖盆地上石炭统近源凝灰岩致密油藏的形成条件,以典型致密油藏M36为例,综合运用岩心、薄片、测录井、地球化学测试等资料,对成藏要素进行解剖,建立上石炭统凝灰岩致密储层及烃源岩有效性的评价标准,并总结出近源致密油藏成藏模式。结果表明,储层孔隙度大于5%、对应渗透率大于0.07×10-3μm2的凝灰岩可以作为有效储层;烃源岩有机碳含量在4.0%以上,对应生烃潜量大于10%,且Ro大于0.8%的高炭泥岩、暗色泥岩为优质烃源岩;较好的储层、优质的烃源岩和互层型源储配置关系是近源凝灰岩致密油藏的形成条件。  相似文献   

音频大地电磁测深法在辽宁瓦房店金伯利岩矿区的应用          下载免费PDF全文

万方来  蒋金晶 《华东地质》2018,(1):42-49

辽宁瓦房店地区是我国著名的金刚石矿产地之一,前人在该区做过大量的研究工作,但找矿方法一直没有突破。本文采用音频大地电磁测深法(AMT)对已知的金伯利岩矿区进行试验,探讨AMT技术在金伯利岩矿区深部探测的应用效果。针对30号金伯利岩岩管区布设了5条剖面,结果显示岩管呈低阻反映,异常明显。结合地质资料,初步推断该区断裂、成矿带和低阻异常展布特征,为在该区进一步开展矿产勘查提供基础资料,对今后瓦房店地区寻找隐伏的金伯利岩体具有重要意义,也为其他类似地区寻找隐伏金伯利岩提供新思路。  相似文献   

Effect of loading duration on uncertainty in creep analysis of clay          下载免费PDF全文

Fang Tan  Wan‐Huan Zhou  Ka‐Veng Yuen 《国际地质力学数值与分析法杂志》2018,42(11):1235-1254

Some studies suggest that creep parameters should be determined using a greater quantity of creep test data to provide more reliable prediction regarding the deformation of soft soils. This study aims to investigate the effect of loading duration on model updating. One‐dimensional consolidation data of intact Vanttila clay under different loading durations collected from the literature is used for demonstration. The Bayesian probabilistic method is used to identify all unknown parameters based on the consolidation data during the entire consolidation process, and their uncertainty can be quantified through the obtained posterior probability density functions. Additionally, the optimal models are also determined from among 9 model candidates. The analyses indicate that the optimal models can describe the creep behavior of intact soft soils under different loading durations, and the adopted method can evaluate the effect of loading duration on uncertainty in the creep analysis. The uncertainty of a specific model and its model parameters decreases as more creep data are involved in the updating process, and the updated models that use more creep data can better capture the deformation behavior of an intact sample. The proposed method can provide quantified uncertainty in the process of model updating and assist engineers to decide whether the creep test data are sufficient for the creep analysis.  相似文献