Development of All-Weather and Real-Time Bottom-Mounted Monitor of Bed Load Quantity     

窦希萍  左其华  应强  黄海龙 《中国海洋工程》2014,(6):807-814

Quantity of bed load is an important physical parameter in sediment transport research. Aiming at the difficulties in the bed load measurement, this paper develops a bottom-mounted monitor to measure the bed load transport rate by adopting the sedimentation pit method and resolving such key problems as weighing and desilting, which can achieve long-time, all-weather and real-time telemeasurement of the bed load transport rate of plain rivers, estuaries and coasts. Both laboratory and field tests show that this monitor is reasonable in design, stable in properties and convenient in measurement, and it can be used to monitor the bed load transport rate in practical projects.  相似文献   

地球球观认知分析:以谷歌地球上的寻路任务为例     

应申  张雯博  苏俊如  黄丽娜 《测绘学报》2021,50(6):739-748

地理空间认知影响人类与空间相关的行为.本文提出了地球空间观(球观)的概念,以地球上不同区域找寻过程作为试验环境,研究被试者在数字地球球体(Google Earth)上如何进行定向、定位和目的地寻找,分析球观模式下对地球球体的空间认知过程.借助眼动仪记录的数据将被试者的读图过程可视化并且进行思维过程分析.结果发现,在地球球体上,结合了即时相对位置判断和方向定位的目的地搜寻过程是被试者球观建立过程的综合表现.  相似文献   

桌面式虚拟环境与真实环境中个体特征影响空间认知能力的差异分析     

黄丽娜  张定娆  应申  艾廷华 《测绘学报》2021,50(4):509-521

利用虚拟地理环境模拟、表达和重构客观真实环境是当前空间认知科学领域的主要试验研究范式之一.针对人们在虚拟环境和真实环境中的认知表现是否一致的问题,本文以桌面式虚拟环境和真实环境为试验场景设计对照试验,将空间认知分为格局认知、对象认知和空间响应3个维度,通过设计认知试验,分析两种环境下参与者的空间认知差异,探究个体特征对空间认知的影响及其环境效应.研究表明:①环境类型和个体特征对空间对象认知无显著影响;②具有地理知识背景、旋转心象地图、使用协调空间参考框架人群的格局认知更详细和准确;③环境类型对路径响应无明显影响,但对转角响应影响显著.参与者在虚拟环境中可以更有效地识别正确方向,并且专业背景具有显著的主效应,MRT水平与环境类型具有显著的联合效应.本文研究结果为基于桌面式虚拟环境进行空间对象认知模拟试验的有效性提供了依据,也可用于指导根据用户特征订制个性化虚拟环境.  相似文献   

东海海啸反问题预报模式研究——以日本“3·11”海啸为例     

应超  于普兵  穆锦斌  周华民 《海洋预报》2015,32(3):36-42

采用COMCOT数值模式,将日本东海岸划分为18个单位震源,建立了日本东海岸海啸数据库并用非负约束的最小二乘法建立反问题预报模式。将本模式应用于日本"3·11"海啸,计算所得的海啸初始水位有10 m的抬高与3 m的降低,与前人研究结果基本一致,预报的浮标水位与实测资料符合良好。对比浙江省近岸潮位站实测海啸波高,预报值与实测值偏差较大。若采用反问题反演的震源,通过COMCOT非线性模式求解近岸水位,可以大幅提高预报精度。  相似文献   

A Preliminary Review of Metallogenic Regularity of Gold Deposits in China   总被引：2，自引：0，他引：2  

WANG Chenghui  WANG Denghong  XU Jue  YING Lijuan  LIU Lijun  LIU Shanbao 《《地质学报》英文版》2015,89(2):632-651

Gold is one of the most important mineral resources in China with its rich mineral resources. In recent years,significant progress has been made on the process of gold resource exploration. Some large and giant gold deposits were newly found and some important expansions in the main mining regions were also been completed. Studies on metallogenic regularity of gold deposits in China also have made achievements with a long–term work. This review aims to conclude the achievements of research on gold metallogenic regularity in China. Based on the data of about 2000 gold deposits and other ore(mineralized) occurrences,gold deposits in China were classified into five prediction types: gold deposits genetically related to granite–greenstone formation,gold deposits related to sedimentary formation(including the Carlin type and the metamorphosed clastic rock related vein gold deposit),gold deposits genetically related to volcanic rocks(including the continental and marine types),gold deposits genetically related to intrusions(including the porphyry type and the inner intrusion and contact zone related gold deposit),gold deposits of supergenesis(including fracture zone–altered rock gold deposit,placer gold deposit,gossan type gold deposit and soil type gold deposit). Statistics on precise chronology data of gold deposits indicate that there occurred 5 main periods of gold–mineralization in geological history of China. They were Neoarchean to Paleoproterozoic,Meso–Neoproterozoic,Paleozoic,Mesozoic,and Cenozoic. Gold deposits in China mainly formed in the Mesozoic and the Cenozoic. On the studies of the spatial–temporal distribution characteristics of gold deposits,53 gold–forming belts were delineated in China. The metallogenic regularity of gold deposits was preliminarily summarized and 71 gold metallogenic series were proposed in China. This suggests that it is necceary to deepen the study on metallogenic regularity of gold deposits and to provide the theory guide for the ore–prospecting for gold resources in China.  相似文献   

A Preliminary Review of Metallogenic Regularity of Copper Deposits in China   总被引：3，自引：0，他引：3  

YING Lijuan  CHEN Yuchuan  WANG Denghong  TANG Juxing  CHEN Zhenghui  WANG Chenghui 《《地质学报》英文版》2015,89(1):251-269

Copper resources in China are rich, but imported copper products are still required. Researches on metallogenic regularity of major types of copper deposits by geologists have involved in worldwide classification, significant copper belts, representative copper deposits, etc. Studies on metallogenic regularity of copper deposits in China also have made achievements with a long-term work. Combined with latest exploration advances obtained in recent ten years, this review aims to conclude the achievements of researches on copper metallogenic regularity in China. Based on data of 814 copper deposits and other ore (mineralized) occurrences, ten prediction types of copper deposits have been suggested. Porphyry and skarn copper ores are taken as the key targets. Porphyry copper deposits are the most important one which concentrate in Gangdese, Changdu-Sanjiang, Dexing and East Tianshan. The Cenozoic and Mesozoic are the major metallogenic epochs. Four main metallogenic epochs are been studied based on the copper ore geochronological data including Precambrian Era (Archean and Proterozoic), Paleozoic Era, Mesozoic Era and Cenozoic Era. Based on the study of metallogenic series of ore deposits in China, twenty-seven metallogenic series of copper deposits are proposed. This is suggested to deepen the study of metallogenic regularity of copper ore and provide the theory guide for copper resources prediction in China.  相似文献   

A Preliminary Review of Metallogenic Regularity of Tungsten Deposits in China     

SHENG Jifu  LIU Lijun  WANG Denghong  CHEN Zhenghui  YING Lijuan  HUANG Fan  WANG Jiahuan  ZENG Le 《《地质学报》英文版》2015,89(4):1359-1374

Tungsten ore resources are abundant in China with relatively complete types of deposits. Skarn type and quartz vein type deposits are dominated in the tungsten resources, whereas quartz vein type wolframite deposits are most important in terms of exploitation and utilization. Skarn type tungsten deposits are concentratedly distributed in the central Nanling region, such as South Hunan, South Anhui and the eastern Qinling region, while quartz vein type tungsten deposits occur mainly in South China, such as West Fujian, South Jiangxi, North Guangdong and South Hunan. The most important metallogenic epoch of tungsten is the Mesozoic, while the metallogenic tectonic setting is featured by an intracontinental environment after orogeny with sever tectonic movements, deep-seated faults and frequent magmatic activities, especially Mesozoic granitoids closely related to tungsten-tin mineralization. 22 metallogenic series of ore deposits characterized by or significantly related to tungsten were defined based on precise statistic information of 1199 tungsten mining areas and thorough the summary of metallogenic regularities. Based on studies of the metallogenic regularity of tungsten deposits, skarn type (or greisen type), quartz vein type and massif-type of tungsten deposits are thought to be the key prediction types. 65 tungsten-forming belts and 22 key ore concentration areas were ascertained and a distribution map of tungsten-forming belts of China was compiled, which provided a theoretical basis for evaluation and prediction of potential tungsten resources.  相似文献   

散列式面状注记自动配置技术研究     

张志军  李霖  于忠海  应申 《武汉大学学报(信息科学版)》2011,(6):739-742

参照国家标准图式规范,结合格式塔心理学,总结了散列式面状注记的配置规则,提出了一种新的自动配置方法。首先,用凸包格网法计算注记的候选位置;然后,用影响注记位置的格式塔因子对候选位置进行质量评价;最后,依据冲突规则得到全局最优解。该方法有效地利用了散列式面状要素周边的区域,扩充了注记的可调节性,并被成功地应用于1∶5万地形图的数字制图中。  相似文献   

利用稳定同位素技术研究广西桂江流域水体中碳的来源   总被引：8，自引：0，他引：8  

王华  张春来  杨会  曹建华  张强  唐伟  应启和  林宇 《地球学报》2011,32(6):691-698

本文对岩溶区不同类型样品中的有机碳同位素样品前处理的分离提纯技术进行了研究,并对广西桂江流域水体进行了稳定有机碳同位素分析.结果表明,C3植物对桂江水体可溶性有机碳(DOC)有很大比例的贡献,而水生生物对水体有机碳影响较小.抚河流域比漓江流域有较高的(DOC)含量,可能与非岩溶区土壤微生物活动强,土壤活性有机碳含量高有...  相似文献   

地幔中EM1端员成因的锂同位素制约   总被引：1，自引：0，他引：1  

汤艳杰  张宏福  英基丰 《矿物岩石地球化学通报》2011,30(1):11-17

在四个地幔端员(DMM、HIMU、EM1、EM2)中,EM1的成因一直令人困惑。华北克拉通中部(太行山地区)地幔橄榄岩捕虏体的Li同位素组成特征为探讨这一问题提供了新的制约。橄榄岩捕虏体中主要组成矿物(橄榄石、斜方辉石和单斜辉石)的Li同位素组成特征表明,该区的岩石圈地幔中有再循环的、古老的洋壳物质。结合已有的地幔橄榄岩捕虏体的Sr-Nd同位素数据,可以推测再循环的古老蚀变洋壳对地幔EM1端员组分的产生有重要的作用。  相似文献