检索结果-南通市图书馆

Land use and cover change and influencing factor analysis in the Shiyang River Basin,China

Journal of Arid Land 2024年第2期16卷 246-265页

作者： ZHAO Yaxuan CAO Bo SHA Linwei CHENG Jinquan ZHAO Xuanru GUAN Weijin pan baotian Key Laboratory of Western China's Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730030China Shiyang River Basin Scientific Observing Station Lanzhou UniversityLanzhou 730030China

Land use and cover change(LUCC)is the most direct manifestation of the interaction between anthropological activities and the natural environment on Earth's surface,with significant impacts on the environment and social economy.Rapid economic development and climate change have resulted in significant changes in land use and cover.The Shiyang River Basin,located in the eastern part of the Hexi Corridor in China,has undergone significant climate change and LUCC over the past few decades.In this study,we used the random forest classification to obtain the land use and cover datasets of the Shiyang River Basin in 1991,1995,2000,2005,2010,2015,and 2020 based on Landsat images.We validated the land use and cover data in 2015 from the random forest classification results(this study),the high-resolution dataset of annual global land cover from 2000 to 2015(AGLC-2000-2015),the global 30 m land cover classification with a fine classification system(GLC_FCS30),and the first Landsat-derived annual China Land Cover Dataset(CLCD)against ground-truth classification results to evaluate the accuracy of the classification results in this study.Furthermore,we explored and compared the spatiotemporal patterns of LUCC in the upper,middle,and lower reaches of the Shiyang River Basin over the past 30 years,and employed the random forest importance ranking method to analyze the influencing factors of LUCC based on natural(evapotranspiration,precipitation,temperature,and surface soil moisture)and anthropogenic(nighttime light,gross domestic product(GDP),and population)factors.The results indicated that the random forest classification results for land use and cover in the Shiyang River Basin in 2015 outperformed the AGLC-2000-2015,GLC_FCS30,and CLCD datasets in both overall and partial validations.Moreover,the classification results in this study exhibited a high level of agreement with the ground truth features.From 1991 to 2020,the area of bare land exhibited a decreasing trend,with changes primarily occurring in the middle and lower

关键词： land use and cover classification land use and cover change(LUCC) climate change random forest accuracy assessment three-dimensional sampling method Shiyang River Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geological and surfacial processes and major disaster effects in the Yellow River Basin

引用

Science China Earth Sciences 2022年第2期65卷 234-256页

作者： Hengxing LAN Jianbing PENG Yanbo ZHU Langping LI baotian pan Qiangbing HUANG Junhua LI Qiang ZHANG School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710054China State Key Laboratory of Resources and Environmental Information System(LREIS) Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Earth and Environmental Science Lanzhou UniversityLanzhou 730000China Yellow River Institute of Hydraulic Research Yellow River Conservancy CommissionZhengzhou 450003China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China

The Yellow River Basin(YRB) is characterized by active geological and tectonic processes, rapid geomorphological evolution, and distinct climatic diversity. Correspondingly, major disasters in the YRB are characterized by varied types,extensive distributions, and sudden occurrences. In addition, major disasters in the YRB usually evolve into disaster chains that cause severe consequences. Therefore, major disasters in the YRB destroy ecologies and environments and influence geological and ecological safety in the basin. This paper systematically reviews research on geological and surface processes, major disaster effects, and risk mitigation in the YRB, discusses the trends and challenges of relevant research, analyzes the key scientific problems that need to be solved, and suggests prospects for future research based on the earth system science concept. Themes of research that should be focused on include geological, surface and climatic processes in the YRB and their interlinking disaster gestation mechanisms;formation mechanisms and disaster chain evolutions of giant landslides in the upper reach of the YRB;mechanisms and disaster chain effects of loess water-soil disasters in the middle reach of the YRB;occurrence patterns and amplifying effects of giant flood chains in the lower reach of the YRB;and risk mitigations of major disasters in the YRB. Key scientific problems that need to be solved are as follows: how to reveal the geological, surface and climatic processes that are coupled and interlinked with gestation mechanisms of major disasters;how to clarify the mutual feedback effects between major disasters and ecology;and how to develop a human-environmental harmony-based integrated risk mitigation system for major disasters. Prospects for future studies that follow the earth system science concept include the following: highlighting interdisciplinary research to reveal the interlinked disaster gestation mechanisms of the geology, surface and climate in the YRB in the past, present, and future;forming th

关键词： Yellow River Basin Geological process Geomorphological evolution Major disaster effect Ecology and environment Risk mitigation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical simulation of landscape evolution and mountain uplift history constrain——A case study from the youthful stage mountains around the central Hexi Corridor,NE Tibetan Plateau

引用

Science China Earth Sciences 2021年第3期64卷 412-424页

作者： baotian pan Shun CAI Haopeng GENG Key Laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou730000China

Landscape evolution models(LEMs)are essential tools for analyzing tectonic-climate interactions and reproducing landform-shaping processes.In this study we used a LEM to simulate the evolution of the mountains from the central Hexi Corridor in the northeastern Tibetan Plateau,where the climate is arid and the surface processes are relatively uniform.However,there are pronounced differences in the topography between the mountains around the central Hexi Corridor.The East Jintanan Shan,West Jintanan Shan and Heli Shan are located in the northern part of the corridor;and the Yumu Shan in the southern part.Firstly,several representative areas were selected from these mountains to analyze the topographic characteristics,including the uniform valley spacing,local relief,and the outlet number.Secondly,a LEM for these areas was constructed using the Landlab platform,and the landscape evolution was simulated.With uniform valley spacing and other topographic characteristics as the criteria,we compared the realistic and simulated terrain for different model ages.Finally,based on the similarity of the simulated and realistic terrain,we estimated the timing of the initial uplift and the uplift rate of the four mountain ranges.The results are consistent with previous geological and geomorphological records from these youthful stage mountains that have not yet reached a steady state.Our findings demonstrate that LEMs combined with topographic characteristics are a reliable means of constraining the timing of the initial uplift and the uplift rate of the youthful stage mountain.Our approach can potentially be applied to other youthful stage mountains and it may become a valuable tool in tectonic geomorphology research.

关键词： Hexi Corridor Landscape evolution models Youthful stage mountains Topographic characteristics Uniform valley spacing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantitative analysis of planation surfaces of the upper Yangtze River in the Sichuan-Yunnan Region, Southwest China

引用

Frontiers of Earth Science 2019年第1期13卷 55-74页

作者： Fenliang LIU Hongshan GAO baotian pan Zongmeng LI Huai SU Key Laboratory of Westem China's Environmental Systems (Ministry of Education) College of Earth and EnvironmentalSciences Lanzhou UniversityLanzhou 730000China School of Geographic Sciences Xinyang Normal UniversityXinyang 464000China College of Tourism and Geography Science Yunnan Normal UniversityKunming 650500China

Identification of the planation surfaces (PSs)is key for utilizing them as a reference in studying the long- term geomorphological evolution of the Upper Yangtze River Basin in the Sichuan-Yurman region,Southwest China.Using a combined method of DEM-based fuzzy logic and topographic and fiver profiles analysis and based on a comprehensive analysis of four morphometfic parameters:slope,curvature,terrain raggedness index, and relative height,we established the relevant fuzzy membership functions,and then calculated the membership degree (MD)of the study area.Results show that patches with a MD>80% and an area>0.4 km^2 correspond well to the results of Google Earth and field investigation,representing the PS remnants.They consist of 1764 patches with an altitude,area,mean slope,and relief of mostly 2000-2500 m above sea level (asl),0-10 km^2,4°-9°,0-500 m,respectively,covering 9.2% of the study area's landscape,dipping to southeast,decreasing progressively from northwest to southeast in altitude,and with no clear relation between each patch's altitude and slope,or relief.All these results indicate that they are remnants of once regionally continuous PSs which were deformed by both the lower crust flow and the faults in upper crust,and dissected by the network of Upper Yangtze River.Additionally,topographic and river profiles analysis show that three PSs (PS1-PS3)well developed along the main valleys in the Yongren-Huili region, indicating several phases of uplift then planation during the Late Cenozoic era.Based on the incision amount deduced from projection of relict river profiles on PSs, together with erosion rates,breakup times of the PS 1,PS2,and PS3 were estimated to be 3.47 Ma,2.19 Ma,and 1.45 Ma,respectively,indicating appearance of modem Upper Yangtze River valley started between the Pliocene to early Pleistocene.

关键词： planation surface fuzzy logic topographic analysis river profile analysis Upper Yangtze River Southwest China

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research on geological and surfacial processes and major disaster effects in the Yellow River Basin

引用

Science China Earth Sciences 2021年

作者： Hengxing LAN Jianbing PENG Yanbo ZHU Langping LI baotian pan Qiangbing HUANG Junhua LI Qiang ZHANG School of Geological Engineering and Geomatics Chang'an University State Key Laboratory of Resources and Environmental Information System (LREIS) Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences College of Earth and Environmental Science Lanzhou University Yellow River Institute of Hydraulic Research Yellow River Conservancy Commission Faculty of Geographical Science Beijing Normal University

The Yellow River Basin(YRB) is characterized by active geological and tectonic processes, rapid geomorphological evolution, and distinct climatic diversity. Correspondingly, major disasters in the YRB are characterized by varied types,extensive distributions, and sudden occurrences. In addition, major disasters in the YRB usually evolve into disaster chains that cause severe consequences. Therefore, major disasters in the YRB destroy ecologies and environments and influence geological and ecological safety in the basin. This paper systematically reviews research on geological and surface processes, major disaster effects, and risk mitigation in the YRB, discusses the trends and challenges of relevant research, analyzes the key scientific problems that need to be solved, and suggests prospects for future research based on the earth system science concept. Themes of research that should be focused on include geological, surface and climatic processes in the YRB and their interlinking disaster gestation mechanisms; formation mechanisms and disaster chain evolutions of giant landslides in the upper reach of the YRB;mechanisms and disaster chain effects of loess water-soil disasters in the middle reach of the YRB; occurrence patterns and amplifying effects of giant flood chains in the lower reach of the YRB; and risk mitigations of major disasters in the YRB. Key scientific problems that need to be solved are as follows: how to reveal the geological, surface and climatic processes that are coupled and interlinked with gestation mechanisms of major disasters; how to clarify the mutual feedback effects between major disasters and ecology; and how to develop a human-environmental harmony-based integrated risk mitigation system for major disasters. Prospects for future studies that follow the earth system science concept include the following: highlighting interdisciplinary research to reveal the interlinked disaster gestation mechanisms of the geology, surface and climate in the YRB in the past, present, and future; form

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

改良单侧经皮椎体后凸成形术结合对侧经皮椎体成形术治疗骨质疏松性椎体压缩性骨折的效果

引用

临床医学工程 2024年第4期31卷 459-460页

作者：郭营李宝田李骁腾潘玉林郑州市骨科医院脊柱二科河南郑州450052

目的探讨改良单侧经皮椎体后凸成形术(PKP)结合对侧经皮椎体成形术(PVP)治疗骨质疏松性椎体压缩性骨折(OVCF)的效果。方法76例OVCF患者随机分为两组,对照组采用双侧PKP治疗,观察组采用改良单侧PKP结合对侧PVP治疗,比较两组的治疗效果。... 详细信息

目的探讨改良单侧经皮椎体后凸成形术(PKP)结合对侧经皮椎体成形术(PVP)治疗骨质疏松性椎体压缩性骨折(OVCF)的效果。方法76例OVCF患者随机分为两组,对照组采用双侧PKP治疗,观察组采用改良单侧PKP结合对侧PVP治疗,比较两组的治疗效果。结果观察组的手术时间短于对照组,骨水泥注入量少于对照组,骨水泥渗漏发生率低于对照组(P0.05)。结论改良单侧PKP结合对侧PVP治疗OVCF的手术用时短,骨水泥用量少,术后骨水泥渗漏发生率低。

关键词：经皮椎体后凸成形术经皮椎体成形术骨质疏松性椎体压缩性骨折

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

局部麻醉下经皮穿刺椎体成形术中推注骨水泥时疼痛的研究

引用

中国骨与关节损伤杂志 2024年第5期39卷 472-476页

作者：李骁腾张怀栓吕丰姿张华李宝田潘玉林郑州市骨科医院脊柱骨科Ⅱ 河南450000 河南省人民医院麻醉科河南郑州450000

目的对局部麻醉经皮穿刺椎体成形术中推注水泥时疼痛的原因进行相关研究。方法回顾性分析自2021-10—2022-10诊治的104例因骨质疏松性椎体压缩性骨折行经皮穿刺椎体成形术且术中推注骨水泥时出现腰部疼痛者。根据术中推注骨水泥时疼痛VA... 详细信息

目的对局部麻醉经皮穿刺椎体成形术中推注水泥时疼痛的原因进行相关研究。方法回顾性分析自2021-10—2022-10诊治的104例因骨质疏松性椎体压缩性骨折行经皮穿刺椎体成形术且术中推注骨水泥时出现腰部疼痛者。根据术中推注骨水泥时疼痛VAS评分以及是否辅助止疼药物进行分组:A组(18例)术中疼痛VAS评分≥7分,术中因腰部疼痛无法保持平卧,静脉辅助止痛药物;B组(46例)术中疼痛VAS评分>4~0.05)。结论对于骨质疏松程度轻、发病时间长、伤椎压缩程度较重以及术前疼痛耐受差的患者,在局部麻醉下行经皮穿刺椎体成形术推注骨水泥时,患者可能更容易出现腰部疼痛。虽然术中疼痛不会影响术后疗效,但是为预防术中疼痛给患者带来的不良就医体验,术前可根据相关影响因素提前评估预防。

关键词：椎体压缩性骨折骨质疏松椎体成形术中疼痛骨水泥

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

地貌学领域自然科学基金项目申请资助、研究范式与启示

引用

科学通报 2023年第34期68卷 4603-4614页

作者：高阳蔡顺潘保田熊巨华国家自然科学基金委员会地球科学部北京100085 盐城师范学院城市与规划学院盐城224002 兰州大学资源环境学院西部环境教育部重点实验室兰州730000

地理科学研究关注地球表层系统的人-地关系及其相互作用机理,地理要素的配置规律、成因是重要基础[1,2].地貌作为一种关键地理要素,是地表过程的基础承载,其形成过程和演化历史体现了地球表面与深部过程的相互作用[3,4],而其时空变化特... 详细信息

地理科学研究关注地球表层系统的人-地关系及其相互作用机理,地理要素的配置规律、成因是重要基础[1,2].地貌作为一种关键地理要素,是地表过程的基础承载,其形成过程和演化历史体现了地球表面与深部过程的相互作用[3,4],而其时空变化特征又影响着地表过程发生的频率与幅度[5,6].因此,地貌学作为地理科学的重要分支学科,其研究充分体现了地理科学所固有的综合性、交叉性和区域性特点.同时,得益于地理科学理论的深化[7]以及技术手段的不断丰富[8],地貌学与其他学科不断交叉融合、取长补短,逐步发展出生态地貌学[9,10]、行星地貌学[11,12]等新兴前沿交叉学科.然而,相较于我国地理科学其他分支学科及国际地貌学的发展态势[13~16],近20年来,我国地貌学发展相对缓慢、学科地位逐渐弱化、后续人才储备相对不足[17,18].

关键词：地理要素区域性特点地球表面交叉学科地貌学人才储备地表过程地球表层系统

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fluvial terraces and their implications for Weihe River valley evolution in the Sanyangchuan Basin

引用

Science China Earth Sciences 2017年第3期60卷 413-427页

作者： GAO HongShan LI ZongMeng LIU XiaoFeng pan baotian WU YaJie LIU FenLiang Key Laboratory of Western China's Environmental System Ministry of EducationCollege of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Lanzhou Institute of Seismology China Earthquake AdministrationLanzhou 730000China

Fluvial terraces are important geomorphic markers for modern valley development.When coupled with numeric ages,terraces can provide abundant information about tectonic,climatic,paleohydrological and the paleoenvironmental changes.On the basis of the paleomagnetic,electron spin resonance(ESR) and optically stimulated luminescence(OSL) dating,in addition to an investigation of local loess-paleosol sequences,we confirmed that 13 fluvial terraces were formed,and then preserved,along the course of the Upper Weihe River in the Sanyangchuan Basin over the past 1.2 Ma.Analyses of the characteristics and genesis of these terraces indicate that they resulted from the response of this particular river system to climate change over an orbital scale.These changes can further be placed within the context of local and regional tectonic uplift,and represent an alternation between lateral migration and vertical incision,dependent upon the predominance of climatic and tectonic controls during different periods.Most of the terraces are strikingly similar in that they have several meters of paleosols which have developed directly on top of fluvial deposits located on the terrace treads,suggesting that the abandonment of terraces due to river incision occurred during the transitions from glacial to interglacial climates.The temporal and spatial differences in the distribution patterns of terraces located on either side of the river valley indicate that a tectonic inversion occurred in Sanyangchuan Basin at-0.62 Ma,and that this was characterized by a transition from overall uplift to depression induced by fault activity.Synthesized studies of the Basin's terraces indicate that formation of the modern valley of the Upper Weihe River may have begun in the late Early Pleistocene between1.4-1.2 Ma.

关键词：河梯田山谷进化构造活动气候变化 Sanyangchuan 盆

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

年轻山地如何能在前陆盆地形成和保存?

引用

Science Bulletin 2022年第12期67卷 1233-1235,M0003页

作者：耿豪鹏蔡顺吕红华潘保田 Key Laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China College of Urban and Environmental Sciences Yancheng Teachers UniversityYancheng 224002China Key Laboratory of Geographic Information Science of Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China

天山北麓逆断裂-背斜构造的生长变形多始于新近纪,但背斜地形可能在晚第四纪才最终显现.这种老构造与年轻地形的不匹配现象在活动造山带的前陆盆地十分普遍.可能的一种解释是:早期的基岩抬升不足以抵消山前河流的扫荡与侵蚀.晚第四纪背... 详细信息

天山北麓逆断裂-背斜构造的生长变形多始于新近纪,但背斜地形可能在晚第四纪才最终显现.这种老构造与年轻地形的不匹配现象在活动造山带的前陆盆地十分普遍.可能的一种解释是:早期的基岩抬升不足以抵消山前河流的扫荡与侵蚀.晚第四纪背斜强烈隆升俨然已突破背斜地形保存的临界抬升速率,但囿于地貌证据与年代学约束的不足,传统方法很难直接获得这一临界速率.本文运用数值模拟、地形比对的方法,约束了背斜地形开始强烈隆升的时间,最终推断天山北麓导致形成背斜地形的临界抬升速率可能介于1~1.6 mm/a.

关键词：前陆盆地背斜构造晚第四纪抬升速率天山北麓逆断裂造山带新近纪

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：