期刊文献+
共找到14篇文章
< 1 >
每页显示 20 50 100
论林业调查规划设计在林业生产建设中的地位和作用
1
作者 孙铁江 《中文科技期刊数据库(全文版)自然科学》 2024年第2期0007-0010,共4页
我国的林业建设工程正在蓬勃发展,虽然取得了一定成绩,但在实际工作中仍面临结构不合理、土地利用率低等问题。这些问题的根源在于缺乏合理的林业调查和规划设计。因此,本文以提高林业调查规划设计的科学性和精准性为目标,分别从调查阶... 我国的林业建设工程正在蓬勃发展,虽然取得了一定成绩,但在实际工作中仍面临结构不合理、土地利用率低等问题。这些问题的根源在于缺乏合理的林业调查和规划设计。因此,本文以提高林业调查规划设计的科学性和精准性为目标,分别从调查阶段和规划设计阶段出发,提出了一系列提高措施。在调查阶段,通过地形地貌调查、植被资源调查和生态环境评估,获取了全面而准确的林地信息。而在规划设计阶段,通过制定合理的林业建设目标、土地利用规划与优化、科学的植被配置方案等关键步骤,实现了科学、合理、可行的林业规划设计。通过这一系列的措施,旨在促进我国林业事业朝着更为可持续的方向迈进。 展开更多
关键词 林业调查 规划设计 地形地貌调查 植被资源调查
下载PDF
Google Earth在矿山地形地貌调查中探讨
2
作者 范国锋 《能源技术与管理》 2019年第4期25-26,119,共3页
简要阐述了矿山地形地貌调查存在的问题及原因,介绍了Google Earth具有强大影像资源,提出了基于西安80系下坐标与WGS-84系下坐标转换思路与方法。通过在泰山隆安煤业的应用,证明该方法减轻了测量人员调查工作量,为矿井提供了直观的地形... 简要阐述了矿山地形地貌调查存在的问题及原因,介绍了Google Earth具有强大影像资源,提出了基于西安80系下坐标与WGS-84系下坐标转换思路与方法。通过在泰山隆安煤业的应用,证明该方法减轻了测量人员调查工作量,为矿井提供了直观的地形地貌信息。 展开更多
关键词 GOOGLE EARTH 坐标转换 地形地貌调查
下载PDF
缅怀李承三教授——重读《嘉陵江流域地理考察报告上卷·地形》 被引量:5
3
作者 施雅风 《成都理工学院学报》 CSCD 1998年第2期119-123,共5页
缅怀李承三教授——重读《嘉陵江流域地理考察报告上卷·地形》施雅风(中国科学院兰州冰川冻土研究所、南京地理与湖泊研究所,兰州730000,南京210008)(一)李承三教授是我很尊敬的前辈地质学家,也是有重要成就... 缅怀李承三教授——重读《嘉陵江流域地理考察报告上卷·地形》施雅风(中国科学院兰州冰川冻土研究所、南京地理与湖泊研究所,兰州730000,南京210008)(一)李承三教授是我很尊敬的前辈地质学家,也是有重要成就的地貌学家。抗日战争期间的1940年,... 展开更多
关键词 地形调查 嘉陵江流域 地理考察 地形素描 李承三
下载PDF
长江科学院开展长江上游水电开发影响河段生态学调查
4
作者 王振华 赵伟华 《长江科学院院报》 CSCD 北大核心 2012年第4期F0003-F0003,共1页
2012年2月8~21日,长江科学院水环境所赵伟华和王振华2位博士组成调查小组,赴凹川省凉山州开展了长江上游水电开发影响的典型河段水生生物和河道地形调查。
关键词 长江科学院 水电开发 长江上游 生态学调查 河段 地形调查 水生生物 水环境
下载PDF
“深海6500号”对鸟岛海山的潜航调查
5
作者 方孝悌 《海洋地质信息通报》 1994年第6期17-18,共2页
关键词 深海 鸟岛海山 潜航调查 地形调查 日本
下载PDF
“海洋六号”开展首个地调航段调查
6
《地球》 2013年第7期8-8,共1页
7月3日16时,接收完最后一批补给物资的“海洋六号”船离开关岛APRA港,开始我国远洋科考史首个地质调查航段(CGS航段)的考察。本次航段,“海洋六号”将利用多种先进调查设备和技术手段,对海底资源、海洋地质和环境等开展调查。本... 7月3日16时,接收完最后一批补给物资的“海洋六号”船离开关岛APRA港,开始我国远洋科考史首个地质调查航段(CGS航段)的考察。本次航段,“海洋六号”将利用多种先进调查设备和技术手段,对海底资源、海洋地质和环境等开展调查。本次航段共有三大亮点:一是首次利用我国自主研制的声学深拖设备在东太平洋海山区开展高精度的地形调查,为富钴结壳资源分布和未来资源的开采提供技术支撑。声学深拖设备于2009年研发,在今年的试航中进行了2000米至3000米实测试验,获得了高精度海底地形图、浅底层剖面、旁侧声呐等资料,为即将开展的实际应用奠定了基础。二是通过超大型重力活塞取样,获取海底浅表层沉积物样品。 展开更多
关键词 海洋地质 调查设备 海底资源 浅表层沉积物 技术支撑 海底地形 地质调查 地形调查
下载PDF
潜深11000m的全海深海神号混合深潜器 被引量:2
7
作者 Andrew D. Bowen Dana R. Yoerger +2 位作者 Chris Taylor 陈宗恒 杨丽娟 《海洋地质》 2014年第1期54-67,共14页
本文介绍了新型“海神号”混合深潜器的概况并总结了其在2007年11月首次海试时的性能表现。“海神号”是一种新型水下作业深潜器,可在11000m全海深海域执行科学调查和取样,几乎是目前所有深潜器工作深度的两倍。“海神号”可以两种不... 本文介绍了新型“海神号”混合深潜器的概况并总结了其在2007年11月首次海试时的性能表现。“海神号”是一种新型水下作业深潜器,可在11000m全海深海域执行科学调查和取样,几乎是目前所有深潜器工作深度的两倍。“海神号”可以两种不同的模式工作,在宽阔的海区调查时,潜水器能够按照无缆AUV模式作业,通过声纳和深海摄像机对海底进行探测和地形调查;在近海底进行摄像和取样调查时,“海神号”能够转换为有缆ROV模式进行作业。本文论述了深潜器的总体和各单元设计,其中包括了陶瓷耐压舱和浮球、机械手和取样系统、轻质光线缆及中继器、照明和摄像系统、动力和推进系统、导航、深潜器动态和控制系统以及水声通讯等。 展开更多
关键词 深潜器 混合 深海 潜深 水下作业 取样系统 地形调查 单元设计
下载PDF
海洋测绘文摘
8
《海洋测绘》 1998年第3期62-64,共3页
阐述了在“SA”和“AS”技术的影响下,为施测高精度GPS控制网,必须采取的一些特别的技术措施。
关键词 海洋测绘 机载激光雷达 测深系统 海底地形调查 电子航海图 电子海图 水文要素 美国海军海洋局 海洋科学研究 GPS控制网
下载PDF
The Recent Crustal Deformation on the Sichuan-Yunnan Rhombic Block Boundaries
9
作者 Lü Yipei 1), Liao Hua 2), Su Qin 2) and Wang Lan 2) 1)Seismological Bureau of Sichuan Province, Chengdu 610041, China 2)Geodetic Brigade of Seismological Bureau of Sichuan Province, Ya’an 625000, China 《Earthquake Research in China》 2002年第4期304-314,共11页
Based on data from an across-fault survey along the Sichuan-Yunnan rhombic block boundaries, the recent deformation characteristics on each fault have been analyzed. It was found that the rate of crustal deformation i... Based on data from an across-fault survey along the Sichuan-Yunnan rhombic block boundaries, the recent deformation characteristics on each fault have been analyzed. It was found that the rate of crustal deformation is slowing down along the northern segment and increasing along the southern segment. Each fault has different features of deformation. The horizontal deformation is mainly characterized by left-lateral strike-slip. The rate of vertical deformation is less than that of the horizontal deformation. The faults have the feature of upper wall uplifting alternated with descending. The anomaly changes of crustal deformation at some sites are closely related to the seismicities near the sites. 展开更多
关键词 The Sichuan-Yunnan rhombic block Crustal deformation EARTHQUAKE Across-fault survey
下载PDF
High-resistance controlled yielding supporting technique in deep-well oil shale roadways 被引量:3
10
作者 Yu Yang Bai Jianbiao +3 位作者 Wang Xiangyu Wang Junde Xue Shizhi Xu Ke 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期229-236,共8页
In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed r... In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed roadway and revealed its failure mechanism by taking comprehensively the methods of field geological investigation, displacement monitoring of surrounding rock, rock properties and hydration properties experiments and field application tests. Based on this work, the high-resistance controlled yielding supporting principle is proposed, which is: to "resist" by high pre-tightening force and high stiff- ness in the early stage, to "yield" by making use of the controlled deformation of a yielding tube in the middle stage, and to "fix" by applying total-section Gunite in the later stage. A high-resistance controlled yielding supporting technique of "high pre-tightening force yielding anchor bolt + small-bore pre-tight- ening force anchor cable + rebar ladder beam + rhombic metal mesh + lagging gunite" has been estab- lished, and industrial on site testing implemented. The practical results show that the high-resistance controlled yielding supporting technique can effectively control the large deformation and long-time rheology of deep-well oil shale roadways and can provide beneficial references for the maintenance of other con-generic roadways.Deep-well Oil shale 展开更多
关键词 Deformation failure mechanism High-resistance controlled yielding supporting Yielding anchor bolt
下载PDF
High-Resolution Seismic Reflection Profiling of the Fenhe Fault in Taiyuan City
11
作者 You Huichuan, He Zhengqin, Ding Zhifeng, Wu Jianping and Wu QingjuInstitute of Geophysics, China Seismological Bureau, Beijing 100081, China 《Earthquake Research in China》 2003年第1期73-84,共12页
In this paper, we demonstrate the high resolution seismic reflection data for a depth range of several hundred meters across the Fenhe fault in Taiyuan city, China. In combination with the relevant borehole logs, thes... In this paper, we demonstrate the high resolution seismic reflection data for a depth range of several hundred meters across the Fenhe fault in Taiyuan city, China. In combination with the relevant borehole logs, these data provide useful constraints on the accurate position, geometry and deformation rate of the fault, as well as the kinematics of recent fault motion. The high resolution seismic reflection profiling revealed that the western branch of the Fenhe fault is a high angle, eastward dipping, oblique normal fault, and cutting up to the lower part of the Quaternary system. It was revealed that the top breaking point of this fault is at a depth of ~70m below the ground surface. A borehole log across the Fenhe fault permitted us to infer that there are two high angle, oppositely dipping, oblique normal faults. The eastem branch lies beneath the eastern embankment of the Fenhe river, dipping to the west and cutting into the Holocene late Pleistocene strata with a maximum vertical offset of ~8m. Another borehole log across the northern segment of the Fenhe fault indicates that the western branch of this fault has cut into the Holocene late Pleistocene strata with a maximum vertical offset of ~6m. The above mentioned data provide a minimum average Pleistocene Holocene vertical slip rate of 0 06~0 08mm/a and a maximum average large earthquake recurrence interval of 5 0~6 7ka for the Fenhe fault. 展开更多
关键词 Taiyuan city Fenhe fault High resolution seismic reflection profiling
下载PDF
Seasonal Variability in the Kuroshio Extension Current System
12
作者 LAN Jian, XU Long, GUO PeifangPhysical Oceanography Laboratory, Ocean University of China, Qingdao 266003, P.R.China 《Journal of Ocean University of Qingdao》 2003年第2期129-133,共5页
Based on the GDEM hydrographic data with a resolution of 0.5°× 0.5°, the current system (Kuroshio south of Japan and Kuroshio Extension east of Japan) is determined by using the P-Vector Method, and its... Based on the GDEM hydrographic data with a resolution of 0.5°× 0.5°, the current system (Kuroshio south of Japan and Kuroshio Extension east of Japan) is determined by using the P-Vector Method, and its seasonal variability is investigated. The Kuroshio Meander south of Japan, the two lee-wave meanders in the Kuroshio Extension and the bifurcation of the Kuroshio Extension are properly presented. The path of the Kuroshio Meander, the position of the second (east) meander in the Kuroshio Extension and the bifurcation of the Kuroshio Extension display evident seasonal variation. 展开更多
关键词 Kuroshio Extension CURRENT seasonal variability Generalized Digital Environmental Model (GDEM)
下载PDF
New Books
13
《China's Tibet》 2017年第5期71-71,共1页
The Geology and Landform of Hoh Xil and Its Evolution This book is edited by Li Jianghai,Wencheng,and Liu Chiheng,and narrates the geology and landform of Hoh Xil.With a large number of photos,this book provides reade... The Geology and Landform of Hoh Xil and Its Evolution This book is edited by Li Jianghai,Wencheng,and Liu Chiheng,and narrates the geology and landform of Hoh Xil.With a large number of photos,this book provides readers with detailed information about topographical features including highland glaciers,lakes,rivers,and plains.Experts apply remote sensing technology,geophysics,and on-site investigations to study Hoh Xil’s structural makeup,model its fractured terrain,and perform a myriad of other analyses. 展开更多
关键词 geophysics fractured terrain geology landform New Books apply scholar heritage Happy
下载PDF
Digital Soil Mapping Using Artificial Neural Networks and Terrain-Related Attributes 被引量:3
14
作者 Mohsen BAGHERI BODAGHABADI José Antonio MARTINEZ-CASASNOVAS +4 位作者 Mohammad Hasan SALEHI Jahangard MOHAMMADI Isa ESFANDIARPOOR BORUJENI Norair TOOMANIAN Amir GANDOMKAR 《Pedosphere》 SCIE CAS CSCD 2015年第4期580-591,共12页
Detailed soil surveys involve costly and time-consuming work and require expert knowledge. Since soil surveys provide information to meet a wide range of needs, new methods are necessary to map soils quickly and accur... Detailed soil surveys involve costly and time-consuming work and require expert knowledge. Since soil surveys provide information to meet a wide range of needs, new methods are necessary to map soils quickly and accurately. In this study, multilayer perceptron artificial neural networks(ANNs) were developed to map soil units using digital elevation model(DEM) attributes. Several optimal ANNs were produced based on a number of input data and hidden units. The approach used test and validation areas to calculate the accuracy of interpolated and extrapolated data. The results showed that the system and level of soil classification employed had a direct effect on the accuracy of the results. At the lowest level, smaller errors were observed with the World Reference Base(WRB)classification criteria than the Soil Taxonomy(ST) system, but more soil classes could be predicted when using ST(7 soils in the case of ST vs. 5 with WRB). Training errors were below 11% for all the ANN models applied, while the test error(interpolation error) and validation error(extrapolation error) were as high as 50% and 70%, respectively. As expected, soil prediction using a higher level of classification presented a better overall level of accuracy. To obtain better predictions, in addition to DEM attributes, data related to landforms and/or lithology as soil-forming factors, should be used as ANN input data. 展开更多
关键词 digital elevation model attributes multilayer perceptron soil classification soil-forming factors soil survey
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部