福建LNG输气干线漳州段ZZ034G+2号桩边坡治理          下载免费PDF全文

王济君  耿万鹏  邓小涛  李继果 《探矿工程》2016,43(4):76-79

福建LNG输气干线漳州段ZZ034G+2号桩附近由于国道加宽开挖,形成了人工高陡边坡。受雨季及不良地质条件影响,该边坡已出现部分滑塌,边坡顶部出现较宽的张性裂缝,严重威胁到边坡顶部天然气管道的安全运营。根据工程地质条件及勘探成果,该边坡被分为两段进行治理。采取了土方反压、抗滑桩、锚索、格构梁及挡土墙等多种加固措施,设置了截排水沟及泄水孔等排水措施,采用了信息化施工及边坡监测技术,取得了良好的边坡治理效果。  相似文献   

淤泥质潮滩地貌演变中的水动力及生物过程研究进展   总被引：2，自引：0，他引：2  

王宁舸  龚政  张长宽  赵堃  耿亮 《海洋工程》2016,34(1):104-116

淤泥质潮滩对于海岸防护、增加土地资源、保持生物多样性等具有重要作用。从淤泥质潮滩演变的主要驱动因子——潮流、波浪、生物作用及地下过程四个方面回顾和总结了潮滩演变动力地貌过程的相关研究进展,提出应关注潮滩短期演变规律、波浪与浮泥作用机理、生物生长与潮滩演变定量关系,以及地下过程作用机理等。  相似文献   

Antialgal and antilarval activities of bioactive compounds extracted from the marine dinoflagellate <Emphasis Type="Italic">Amphidinium carterae</Emphasis>     

Xianyu Kong  Xiurong Han  Min Gao  Rongguo Su  Ke Wang  Xuzhao Li  Wei Lu 《中国海洋大学学报(英文版)》2016,15(6):1014-1020

With the global ban on the application of organotin-based marine coatings by the International Maritime Organization, the development of environmentally friendly, low-toxic and nontoxic antifouling compounds for marine industries has become an urgent need. Marine microorganisms have been considered as a potential source of natural antifoulants. In this study, the antifouling potential of marine dinoflagellate Amphidinium carterae, the toxic and red-tide microalgae, was investigated. We performed a series of operations to extract the bioactive substances from Amphidinium carterae and tested their antialgal and antilarval activities. The crude extract of Amphidinium carterae showed significant antialgal activity and the EC₅₀ value against Skeletonema costatum was 55.4 μg mL^?1. After purification, the isolated bioactive substances (the organic extract C) exhibited much higher antialgal and antilarval activities with EC₅₀ of 12.9 μg mL^?1 against Skeletonema costatum and LC₅₀ of 15.1 μg mL^?1 against Amphibalanus amphitrite larvae. Subsequently, IR, Q-TOFMS, and GC-MS were utilized for the structural elucidation of the bioactive compounds, and a series of unsaturated and saturated 16- to 22-carbon fatty acids were detected. The data suggested the bioactive compounds isolated from Amphidinium carterae exhibited a significant inhibiting effect against the diatom Skeletonema costatum and Amphibalanus amphitrite larvae, and could be substitutes for persistent, toxic antifouling compounds.  相似文献   

黄铁矿ReOs法测年在胶东金矿中的应用初探          下载免费PDF全文

李洪奎  耿科  禚传源  梁太涛  张玉波 《山东国土资源》2016,32(4):1-6

该次工作为黄铁矿Re-Os法测年在胶东金矿中的首次应用。在大尹格庄金矿中获得了由3件黄铁矿样品组成的(144.8±1.8)Ma等时线年龄,暗示着大尹格庄金矿区可能存在一期晚侏罗世的Au成矿事件。通过对大尹格庄、夏甸、土堆金矿黄铁矿Re-Os同位素年代学的研究,表明黄铁矿的Re-Os同位素特征在胶东金矿中具有一定的复杂性。该文总结了影响黄铁矿Re-Os同位素测年结果的因素,认为在利用该方法进行金矿床定年时,应当将不同期次黄铁矿分别送样,适当拉大采样间距,并尽可能降低实验测试误差,以期获得更精确可靠的年龄。  相似文献   

LA-ICP-MS测定锡石U-Pb同位素年龄时两种普通铅扣除方法的原理及适用性比较   总被引：1，自引：0，他引：1  

郝爽  李惠民  李国占  耿建珍  周红英  肖志斌  崔玉荣  涂家润 《地质通报》2016,35(4):622-632

根据近年来激光烧蚀电感耦合等离子体质谱仪锡石微区原位U-Pb同位素定年的实验结果,结合相关资料,对实验过程中普通铅扣除的2种主要方法,即谐和图法和等时线法的原理、效果、优点和局限性进行了深入的比较。研究成果表明,2种主要方法各有不同的优点及局限性。在实际工作中,要想获得比较准确的测试结果,需要根据具体矿物样品的年龄范围、总的U和Pb含量、普通铅相对含量、测年精度要求等因素,灵活地选择普通铅扣除的方法。  相似文献   

Quantitative assessment on the influence of rainfall on landslides in Jianshi County of Qing River Basin,China     

Ningtao Wang  Tingting Shi  Yiyong Li  Zhipeng Lian  Peng Ke 《Environmental Earth Sciences》2016,75(3):241

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Soil and water conservation in mining area based on ground surface subsidence control: development of a high-water swelling material and its application in backfilling mining     

Ailong Wang  Liqiang Ma  Zhongwei Wang  Dongsheng Zhang  Ke Li  Yao Zhang  Xingjun Yi 《Environmental Earth Sciences》2016,75(9):779

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Monitoring and analysis of changes in a wetland landscape in Xingzi county     

Zuobang Zhang  Changqing Ke 《Earth Science Informatics》2016,9(1):35-45

Wetlands play an important role in water conservation, environmental protection, and biodiversity conservation. Remote sensing is an economical and efficient technique for wetland monitoring which can limit disturbance in sensitive areas and support wetland conservation. In this paper, we used three phases of Thematic Mapper/Enhanced Thematic Mapper plus (TM/ETM+) remote sensing images from October 1989, October 1999, and October 2009 to study wetlands in Xingzi County. The images were segmented using the object-oriented remote sensing image interpretation software eCognition Developer 8.64, then segmented images were classified by slope, digital elevation model (DEM) data, Normalized Difference Vegetation Index (NDVI), Specific Leaf Area Vegetation Index (SLAVI), and Land and Water Masks (LWM) index to produce land type classification maps. Land use change information was obtained by analyzing the superposition of two classification maps of the wetland area from different years. The results showed that landscape patches in Xingzi County displayed fragmentation in their spatial distribution over time. Based on an index of changes in landscape patches, the fastest growing landscape type is grassland, while the fastest decreasing type is irrigated land. Dominant driving factors of changes in Xingzi County’s wetland landscape are population growth and policy changes.  相似文献   

Landslide susceptibility zonation using GIS and evidential belief function model     

Yanli Wu  Yutian Ke 《Arabian Journal of Geosciences》2016,9(17):697

The main goal of this paper is to generate a landslide susceptibility map through evidential belief function (EBF) model by using Geographic Information System (GIS) for Qianyang County, Shaanxi Province, China. At first, a detailed landslide inventory map was prepared, and the following ten landslide-conditioning factors were collected: slope angle, slope aspect, curvature, plan curvature, profile curvature, altitude, distance to rivers, geomorphology, lithology, and rainfall. The landslides were detected from the interpretation of aerial photographs and supported by field surveys. A total of 81 landslides were randomly split into the following two parts: the training dataset 70 % (56 landslides) were used for establishing the model and the remaining 30 % (25 landslides) were used for the model validation. The ArcGIS was used to analyze landslide-conditioning factors and evaluate landslide susceptibility; as a result, a landslide susceptibility map was generated by using EBF and ArcGIS 10.0, thus divided into the following five susceptibility classes: very low, low, moderate, high, and very high. Finally, when we validated the accuracy of the landslide susceptibility map, both the success-rate and prediction-rate curve methods were applied. The results reveal that a final susceptibility map has the success rate of 83.31 % and the prediction rate of 79.41 %.  相似文献   

Seasonal variation and principle of cyanobacterial biomass and forms in the water source area of Chaohu City,China     

徐宪根  柯凡  李文朝  冯慕华  尚丽霞  范帆  何延召 《中国海洋湖沼学报》2016,34(1):34-43

We investigated seasonal variations in cyanobacterial biomass and the forms of its dominant population(M. aeruginosa) and their correlation with environmental factors in the water source area of Chaohu City,China from December 2011 to October 2012. The results show that species belonging to the phylum Cyanophyta occupied the maximum proportion of phytoplankton biomass,and that the dominant population in the water source area of Chaohu City was M. aeruginosa. The variation in cyanobacterial biomass from March to August 2012 was well fitted to the logistic growth model. The growth rate of cyanobacteria was the highest in June,and the biomass of cyanobacteria reached a maximum in August. From February to March 2012,the main form of M.aeruginosa was the single-cell form; M.aeruginosa colonies began to appear from April,and blooms appeared on the water surface in May. The maximum diameter of the colonies was recorded in July,and then gradually decreased from August. The diameter range of M. aeruginosa colonies was 18.37–237.77 μm,and most of the colonies were distributed in the range 20–200 μm,comprising 95.5% of the total number of samples. Temperature and photosynthetically active radiation may be the most important factors that influenced the annual variation in M. aeruginosa biomass and forms. The suitable temperature for cyanobacterial growth was in the range of 15–30°C. In natural water bodies,photosynthetically active radiation had a significant positive influence on the colonial diameter of M.aeruginosa(P0.01).  相似文献