Rebuttal to “Effect of seasonable weather variations on the desiccation behavior of treated oil sand fine tailings” by Owolagba and Azam (Environ Earth Sci 2015, 74(2): 1711–1717)     

Jian Liu  Jun-wen Huang  Gang Deng  Jia Xu 《Environmental Earth Sciences》2016,75(6):528

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Scenario-based runoff prediction for the Kaidu River basin of the Tianshan Mountains,Northwest China     

Changchun Xu  Jie Zhao  Haijun Deng  Gonghuan Fang  Jing Tan  Dandan He  Yapeng Chen  Yaning Chen  Aihong Fu 《Environmental Earth Sciences》2016,75(15):1126

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Groundwater storage and depletion trends in the Loess areas of China     

Aidi Huo  Jianbing Peng  Xunhong Chen  Lin Deng  Guoliang Wang  Yuxiang Cheng 《Environmental Earth Sciences》2016,75(16):1167

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Adsorption of Tl(I) on Na–montmorillonite and kaolinite from aqueous solutions     

Hong-Mei Deng  Yong-Heng Chen  Hong-Hai Wu  Tao Liu  Yao-Long Wang  Gao-Yuan Wu  Heng-Peng Ye 《Environmental Earth Sciences》2016,75(9):752

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Creep degradation mechanism by water-rock interaction in the red-layer soft rock     

H.F. Deng  M.L. Zhou  J.L. Li  X.S. Sun  Y.L. Huang 《Arabian Journal of Geosciences》2016,9(12):601

Bank slope stability has become a great concern, while the impoundment of Three Gorges reservoir. The bank slope composed of red-layer soft rock has exhibited distinct deformation and failure. Therefore, a typical red-layer soft rock around Three Gorges reservoir area was selected to demonstrate the process of cyclic changes at the reservoir level and immersion-air-dry cyclic action of water-rock inside hydro-fluctuation belt. To meet the objective of this study, a series of creep tests were conducted on the rock specimens at different water-rock interaction stages. The following points were noticed based on the laboratory results: (1) the creep fracture strength and long-term strength of red-layer soft rock degraded significantly during the process of water-rock interaction. For the first three water-rock interaction circulations, the strength of red-layer soft rock degraded quickly and then gradually became stable. (2) During the creep test, the lateral expansion of red-layer soft rock increased significantly regarding to the number of cycles. (3) The creep curve includes three typical stages at failure stress level—primary (damped) stage, secondary (steady-state) stage, and tertiary (nonlinear accelerated) stage. As the number of cycles increased, the percentage of secondary stage diminished gradually. However, the tertiary stage showed a gradual increment, since the plasticity of the specimens was strengthened by water-rock interaction. (4) The shear failure characteristics of the specimens became highly considerable during the process of water-rock interaction, and there have been a gradual increment of shear rupture zone. (5) The SEM results showed that the specimen microstructure changed its state from dense to loose and porous. The findings of this research provide a good basis for long-term stability analysis of bank slope.  相似文献   

胶州湾沉积物-海水界面硅的交换速率及其影响因素探讨   总被引：2，自引：1，他引：1  

汪雅露  袁华茂  宋金明  李学刚  李宁  曲宝晓  康绪明  王启栋  邢建伟  梁宪萌 《海洋学报》2016,38(12):55-65

采用实验室培养法在原位温度和溶氧条件下测定了胶州湾沉积物-海水界面硅的交换速率,并探讨了相关环境因子对界面交换速率的影响机制。结果表明,胶州湾沉积物-海水界面硅的交换表现为从沉积物向水体释放,其交换速率在947~4 889 μmol/（m2·d）范围内,平均速率为1 819 μmol/（m2·d）。表层沉积物中叶绿素a（Chl a）和总有机碳（TOC）是影响胶州湾沉积物-海水界面硅交换速率的主要环境因子,同时表层沉积物的含水率（φ）、生源硅（BSi）和粘土含量以及间隙水中溶解硅酸盐（DSi）对沉积物-海水界面硅的交换也有重要影响。由此可推知,胶州湾沉积物-海水界面硅的交换速率主要受生物活动和溶解-扩散双重过程调控,而表层沉积物粒度与底层水体中DSi对胶州湾硅的释放影响较小。  相似文献   

Latent spatio-temporal activity structures: a new approach to inferring intra-urban functional regions via social media check-in data   总被引：1，自引：0，他引：1  

Ye Zhi  Haifeng Li  Dashan Wang  Min Deng  Shaowen Wang  Jing Gao 《地球空间信息科学学报》2016,19(2):94-105

Abstract

This article introduces a novel low rank approximation (LRA)-based model to detect the functional regions with the data from about 15 million social media check-in records during a year-long period in Shanghai, China. We identified a series of latent structures, named latent spatio-temporal activity structures. While interpreting these structures, we can obtain a series of underlying associations between the spatial and temporal activity patterns. Moreover, we can not only reproduce the observed data with a lower dimensional representative, but also project spatio-temporal activity patterns in the same coordinate system. With the K-means clustering algorithm, five significant types of clusters that are directly annotated with a combination of temporal activities can be obtained, providing a clear picture of the correlation between the groups of regions and different activities at different times during a day. Besides the commercial and transportation dominant areas, we also detected two kinds of residential areas, the developed residential areas and the developing residential areas. We further interpret the spatial distribution of these clusters using urban form analytics. The results are highly consistent with the government planning in the same periods, indicating that our model is applicable to infer the functional regions from social media check-in data and can benefit a wide range of fields, such as urban planning, public services, and location-based recommender systems.  相似文献   

Challenges and complications in neighborhood mapping: from neighborhood concept to operationalization     

Yongxin Deng 《Journal of Geographical Systems》2016,18(3):229-248

This paper examines complications in neighborhood mapping and corresponding challenges for the GIS community, taking both a conceptual and a methodological perspective. It focuses on the social and spatial dimensions of the neighborhood concept and highlights their relationship in neighborhood mapping. Following a brief summary of neighborhood definitions, five interwoven factors are identified to be origins of neighborhood mapping difficulties: conceptual vagueness, uncertainty of various sources, GIS representation, scale, and neighborhood homogeneity or continuity. Existing neighborhood mapping methods are grouped into six categories to be assessed: perception based, physically based, inference based, preexisting, aggregated, and automated. Mapping practices in various neighborhood-related disciplines and applications are cited as examples to demonstrate how the methods work, as well as how they should be evaluated. A few mapping strategies for the improvement of neighborhood mapping are prescribed from a GIS perspective: documenting simplifications employed in the mapping procedure, addressing uncertainty sources, developing new data solutions, and integrating complementary mapping methods. Incorporation of high-resolution data and introduction of more GIS ideas and methods (such as fuzzy logic) are identified to be future opportunities.  相似文献   

基于多源信息融合理论的盐湖资源综合动态监测及预警系统设计与实现   总被引：1，自引：1，他引：0       下载免费PDF全文

王建萍  凌智永  陈亮  芦宝良  邓婷文 《盐湖研究》2016,24(1):50-57

近年来随着人类开采力度的不断加大和全球气候变化的影响,盐湖资源系统正在发生着急剧变化,盐湖生产对环境的影响也日渐突出。将多源信息融合理论与动态综合监测理论相结合,基于GIS、物联网和无线通讯技术,从相互关联的环境、资源和产业多个子系统中选取关键监测指标,从构建理论、构建原则、技术体系和系统结构等方面对构建盐湖资源综合监测系统进行全面设计;并结合青海吉乃尔盐湖区具体实际,在监测站网的最优化布局、传感器选型、数据传输方案和多源数据整合方面开展深入探讨;最后对水灾、环境、生产等预警模型的预警层次和预警模式提出具体实现路径。对保障盐湖产业可持续发展与生产安全,保证西部国民经济、社会和谐发展具有重要意义。  相似文献   

中国流动人口的省际迁移模式、集疏格局与市民化路径   总被引：2，自引：1，他引：1  

徐姗  邓羽  王开泳 《地理科学》2016,36(11):1637-1642

系统回顾了中国流动人口的省际变动与集疏格局,包括总体特征与演化趋势,基于迁出地和迁入地属性差异的省际流动人口模式以及基于城市规模的流动人口分布特征,采用趋势分析和马尔科夫链方法预测了中国省际流动人口的空间迁移趋势,由此提出了中国流动人口的市民化路径与建议如下：① 人口的跨区域流动重塑着中国的人口空间格局,东部地区应审慎而稳妥地推进市民化;②积极稳妥地推进中西部地区的城镇化进程,重点推进省内流动人口的就近市民化;③ 不同地区要制定不同的政策,因地制宜地推进市民化进程。  相似文献