检索结果-南通市图书馆

Evaluation of deep learning algorithms for landslide susceptibility mapping in an alpine-gorge area:a case study in jiuzhaigou County

引用

Journal of Mountain Science 2023年第2期20卷 484-500页

作者： WANG Di YANG Rong-hao WANG Xiao LI Shao-da TAN Jun-xiang ZHANG Shi-qi WEI Shuo-you WU Zhang-ye CHEN Chao YANG Xiao-xia College of Earth Sciences Chengdu University of TechnologyChengdu 610059China School of Architecture and Civil Engineering Chengdu UniversityChengdu 610106China Land consolidation center of Sichuan Province Department of Natural Resources of Sichuan ProvinceChengdu 610072China

With its high mountains,deep valleys,and complex geological formations,the jiuzhaigou County has the typical characteristics of a disaster-prone mountainous region in southwestern China.On August 8,2017,a strong Ms 7.0 earthquake occurred in this region,causing some of the mountains in the area to become loose and cracked.Therefore,a survey and evaluation of landslides in this area can help to reveal hazards and take effective measures for subsequent disaster management.However,different evaluation models can yield different spatial distributions of landslide susceptibility,and thus,selecting the appropriate model and performing the optimal combination of parameters is the most effective way to improve susceptibility evaluation.In order to construct an evaluation indicator system suitable for jiuzhaigou County,we extracted 12 factors affecting the occurrence of landslides,including slope,elevation and slope surface,and made samples.At the core of the transformer model is a self-attentive mechanism that enables any two of the features to be interlinked,after which feature extraction is performed via a forward propagation network(FFN).We exploited its coding structure to transform it into a deep learning model that is more suitable for landslide susceptibility evaluation.The results show that the transformer model has the highest accuracy(86.89%),followed by the random forest and support vector machine models(84.47%and 82.52%,respectively),and the logistic regression model achieves the lowest accuracy(79.61%).Accordingly,this deep learning model provides a new tool to achieve more accurate zonation of landslide susceptibility in jiuzhaigou County.

关键词： jiuzhaigou Landslide susceptibility Transformer Model Deep learning Forest

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

Rotational motions of the Ms7.0 jiuzhaigou earthquake with ground tilt data

引用

Science China Earth Sciences 2019年第5期62卷 832-842页

作者： Cong ZHOU Xiangzhi ZENG Qingliang WANG Wenyi LIU Cuizhi WANG The Second Monitoring and Application Center China Earthquake Administration Institute of Geology China Earthquake Administration Institute of Geology Chinese Academy of Geological Sciences

Observation and research of rotational motions induced by earthquake has been ignored in the past decades due to the lack of understanding of important ground rotational motions and practical difficulty involved in directly measuring the rotational components. Currently, there is a paucity of methods to directly measure rotational motions in China. The present study attempts to discuss the possibility of obtaining seismic rotation from ground tilt data. The rotational motions generated by shear dislocation source are derived based on the displacement formula of elastic wavefields in the homogenous space. The characteristics of the three components of translational and rotational motions in near, intermediate, and far fields are compared and analyzed. Based on the corresponding relationship between the rotation and ground tilt on free surface boundary, a method to indirectly construct the rotational motions in the layered half space is obtained. Finally, the theoretical rotational motions generated by the Ms7.0 earthquake in jiuzhaigou, Sichuan Province, on August 8, 2017 are calculated. The results indicate that the rotational motions generated by the jiuzhaigou earthquake are concentrated in the vicinity of the epicenter(approximately150 km) and mainly distributed in the area perpendicular to the fault strike. The existence of free surface boundary attenuates the total energy of the rotational field and especially in the direction of the dominant energy. The ground tilt data is compared with rotational motions in the layered half space, and the results indicate that theoretical rotations and actual ground tilt data are essentially consistent, especially in the far field region. Thus, it is possible to obtain horizontal components of rotation from ground tilt data, and this provides more information for a complete description of the motion characteristics of an underground medium.

关键词： Rotational motions Layered half space jiuzhaigou earthquake Ground tilt Strike slip fault

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

Inventory and Spatial Distribution of Landslides Triggered by the 8th August 2017 M_W 6.5 jiuzhaigou Earthquake, China

引用

Journal of Earth Science 2019年第1期30卷 206-217页

作者： Yingying Tian Chong Xu Siyuan Ma Xiwei Xu Shiyuan Wang He Zhang Key Laboratory of Active Tectonics and Volcano Institute of GeologyChina Earthquake Administration Institute of Crustal Dynamics China Earthquake Administration Sichuan Earthquake Agency Hebei Earthquake Agency

An accurate and detailed seismic landslide inventory is essential to better understand the landslide mechanism and susceptibility. The 8 th August 2017 MW 6.5 jiuzhaigou Earthquake of China initiated a large number of coseismic landslides. The results of the post-seismic survey show the actual landslide number might be underestimated in previous publications. Coupled with field investigation and visual interpretation on high-resolution remote sensing images before and after the main shock, we established a detailed inventory of landslides triggered by the earthquake. Results show that this event caused at least 4 834 individual landslides with a total area of 9.64 km^2. They are concentrated in an elliptical area of 434 km^2, dominated by medium-and small-scale rock falls and debris slides. Statistics indicate that, except for slope aspect that seems not significantly correlated with the landsliding, these landslides are most common in the places with following features: elevation of 2 800–3 400 m, slope angle greater than 30o, slope positions of upper, middle and flat slopes, and Carboniferous limestone and dolomite. Besides, the landslide area percentage(LAP) and landslide number density(LND) values decrease with the increasing distance to river channels and roads, implying a positive correlation. Instead of centering around the epicenter, most of these coseismic landslides are distributed along the inferred seismogenic fault, which means that the seismogenic structure played a more important role than the location of the epicenter. Remarkable differences in landslide densities along the fault indicate the varied landslide susceptibility which may be attributed to other varied controls along the fault such as the rock mass strength. In sum, this study presents a more detailed inventory of the landslides triggered by the 2017 MW 6.5 jiuzhaigou Earthquake, describes their distribution pattern and analyzes its control factors, which would be helpful to understand the genesis of the coseismic landslides and further

关键词： jiuzhaigou Earthquake coseismic landslide landslide inventory influencing factors spatial distribution

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

Zircon LA-ICP MS U-Pb Dating of the Longkang Andesitic Ignimbrites from jiuzhaigou: Evidence of the Mianlue Suture Westward Extension

引用

Journal of China University of Geosciences 2008年第1期19卷 47-53页

作者：秦江锋赖绍聪张国伟第五春荣李永飞 State Key Laboratory of Continental Dynamics Department of Geology Northwest University

Genesis of metasedimentary-volcanics outcroped in Kangxian-Pipasi-Nanping （康县-琵琶寺-南坪） tectonic zone is closely related with tectonic evolution of the Mianlue （勉略） Ocean. In the west end of Kangxian-Pipasi-Nanping tectonic zone, there are hundred meters of andesitic ignimbrites and tuffites. Zircon U-Pb dating on these volcanics has great significance to the tectonic implication of the volcanic rocks. Zircons from an ignimbrite sample （JZG-L） have been collected from Yazhagou （牙扎沟） in the east end of the Tazang-Longkang （塔藏-隆康） Section for LA-ICP MS U-Pb dating. The zircons from Longkang andesitic ignimbrites are magmatic genesis with oscillatory zoning and high U （（35-750） ppm）, Th （（311-717） ppm） contents with high Th/U （0.44-1.30） ratios. The measured 206pb/238u ratios are in good analytical precision, yielding a weighted mean age of （246±3） Ma （MSWD=2.6, n=12, 2a）. Some detrital zircons have also been observed, they have maximal concordia age of （2 481±33） Ma, which indicates the existence of Precambrian material in the jiuzhaigou （九寨沟） area. Combined with regional geology and the volcanic rocks in the studied area, the （246±3） Ma zircon U-Pb age suggests a Late Permian orogenic volcanism and provides important geochronology evidence for the Mianlue suture westward extension.

关键词： jiuzhaigou ignimbrite zircon LA-ICP MS U-Pb dating Mianlue suture.

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

Risk Identification of Seismic Landslides by Joint Newmark and RockFall Analyst Models: A Case Study of Roads Affected by the jiuzhaigou Earthquake

引用

International Journal of Disaster Risk Science 2018年第3期9卷 392-406页

作者： Xiliu Yue Shaohong Wu Yunhe Yin Jiangbo Gao Jingyun Zheng Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Key Laboratory of Land Surface Pattern and Simulation University of Chinese Academy of Sciences

Geological disasters are a great threat to people's lives and property. At present, it is difficult to evaluate quantitatively the cascading effects of regional geological disasters, and the development of new methods for such evaluation is much needed. In this study, the authors have developed a joint procedure that couples the Newmark model and the RockFall Analyst model based on a GIS platform in order to identify the impact of seismic landslides on roads. The new method effectively combines two processes—seismic landslide occurrence probability analysis and mass movement trajectory simulation. The permanent displacement derived from the Newmark model is used to identify potential source areas of landslides.Based on the RockFall Analyst model, the possible impact of mass movement on the roads can be simulated. To verify the reliability of the method, the landslides induced by the 2017 jiuzhaigou Earthquake were taken as a case study.The results suggest that about 21.37% of the study area is at high risk of seismic landslides, and approximately 3.95 km of road sections are at extremely high risk of large landslides. The simulated area is consistent with the distribution of disasters revealed by post-earthquake remote sensing image interpretation and field investigation in existing studies. This indicates that the procedure, which joins the Newmark and RockFall models, has a high reliability for risk identification and can be applied to seismic landslide risk assessment and prediction in similar areas.

关键词： China jiuzhaigou earthquake Newmark model Risk identification RockFall analyst model Seismic landslide

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

Territorial suitability assessment and function zoning in the jiuzhaigou earthquake-stricken area

引用

Journal of Mountain Science 2019年第1期16卷 195-206页

作者： YU Hui QIANG Miao LIU Shao-quan Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences Chengdu Pidu Disstrict Mianshi Foreign Language School

An earthquake in the jiuzhaigou area caused numerous secondary disasters, such as rolling stones, land collapse, landslides and debris flow, which badly affected the safety of human settlements and influenced the spatial layout of the post-disaster reconstruction. Therefore, carrying out assessments of land and identifying a suitable zone for human habitats were very important. This research creates the territorial suitability assessment and function zoning conceptual model in the earthquake-stricken area, and the new methods of the territorial suitability evaluation system were used to divide the spatial functional zones of the earthquake stricken area, which provide a theoretical guidance and decisionmaking basis for the reconstruction of the disaster area. The results showed that:(1) The jiuzhaigou earthquake-stricken area comprises of an ecological area that has a high level of importance to the ecosystem. In the earthquake-stricken area, 65% of national land is at an altitude of 3000-4000 m, and therefore not suitable for a high level of intensive reconstruction, but reconstructed in an eco-friendly manner.(2) The zone suitable for reconstruction comprises mainly of the river valley and the flat terrain of western parts. The land with low suitability is mainly located on steep terrain, such as highmountains and low gullies. The geographic and geomorphic conditions limit the spread of a suitable reconstruction zone.(3) The earthquake-stricken area mainly comprises of a tourism industry gathering area, population gathering area, agriculture and animal husbandry development area, and ecological preservation area with areas of 76 km^2, 44 km^2, 1591 km^2 and 7512 km^2, respectively. Scientifically zoning the reconstruction areas using scientific evaluation may provide guidance for the location of reconstruction sites.

关键词： jiuzhaigou valley Earthquake-stricken area Territorial suitability Function zoning

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

Seismic response of cracking features in Jubao Mountain during the aftershocks of jiuzhaigou Ms7.0 earthquake

引用

Journal of Mountain Science 2019年第11期16卷 2532-2547页

作者： SHEN Tong WANG Yun-sheng LUO Yong-hong XIN Cong-cong LIU Yong HE Jian-xian The State Key Laboratory of Geohazards Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China The Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China

jiuzhaigou is a world-heritage site located in the plateau area of Northwest Sichuan Province,China.Serious slope failures in the epicentral area were triggered by the Ms7.0 jiuzhaigou earthquake occurred on August 8,2017.The source areas of the hazards are usually concentrated near ridge crests,revealingthe possible occurrence of ground motion amplification phenomena.To explore the role of the amplification of ground motions in the formation of earthquake-triggered slope failures,two seismometers were installed,on the next day after the main shock,at the bottom of the slopeof Jubao Mountain near the seismogenic fault.The two monitoring sites are located at elevations of 1414 m(J1)and 1551 m(J2,the top of the mountain).Five aftershocks were recorded by the monitoring instruments.We compared the mean levels of the peak ground acceleration(PGA)observed at different locations,and investigated the directional variations inthe shaking energy by analyzing the polar diagrams of the Arias intensity(Ia).Then,in order to identify the directional resonance phenomenonandtheir frequencies and amplification coefficients,we examined the horizontal-to-vertical spectral ratio(HVSR)and the standard spectral ratio(SSR).Polar diagrams of theArias intensity(Ia)indicated that the site response of Jubao Mountain showed a pronounced directivity(in theEW direction)with shaking maxima near the hill top oriented orthogonally to the elongation of the relief.We observed anobvious resonance phenomenonat site J2 at relatively low frequencies(2.5-9 Hz)and very weak spectral amplifications at site J1 at high frequencies(5-15 Hz),which suggested that the predominant frequency of monitoring site J2 was obviously attenuated and that the difference in the spectra was related to the influences of the local-scale site conditions of the whole mountain.The results of spectral ratio analyses(HVSR and SSR)showed that the direction of resonance was concentrated around an EW orientation,and the amplification factors near the hill top were larger than 2.It s

关键词： jiuzhaigou Ms7.0 earthquake Aftershocks Directivity effects Slope dynamic response HVSR SSR

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 assessment of the impact of earthquakeinduced geohazards on natural landscapes in jiuzhaigou Valley

引用

Journal of Mountain Science 2019年第2期16卷 441-452页

作者： HU Xu-dong HU Kai-heng ZHANG Xiao-peng WEI Li TANG Jin-bo Key Laboratory of Mountain Hazards and Earth Surface Processes Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

Many natural landscapes that lie in high mountain regions are highly susceptible to geological hazards, and their values and integrity are strongly threatened by the hazards. A preliminary framework was proposed to undertake a quantitative assessment of the impact of earthquake-induced geological hazards on the natural landscapes. Four factors reflecting the aesthetic value, ecological value, integrity of landscapes were selected to assess their vulnerability. The impact of earthquake-induced geological hazards on the landscapes is quantitatively expressed as the product of their vulnerability and resilience. The assessment framework was applied to jiuzhaigou Valley which was severely struck by the Ms 7.0 earthquake on August 8, 2017. Field survey, satellite image interpretation, high-resolution DEM and unmanned aerial vehicle(UAV) reconnaissance were used to retrieve the values of the assessment factors. Twenty seven World Heritage Sites in the valley strongly influenced by the earthquakeinduced geohazards were evaluated. The impact values of two sites of them(Sparking Lake and Nuorilang Waterfall) are up to 8.24 and 4.65, respectively, and their natural landscapes were greatly damaged. The assessment results show a good agreement with the actual damages of the heritage sites.

关键词： Natural landscapes assessment jiuzhaigou earthquake Earthquake-induced geohazards World Heritage Sites

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

Integrated rockfall hazard and risk assessment along highways: An example for jiuzhaigou area after the 2017 Ms 7.0 jiuzhaigou earthquake, China

引用

Journal of Mountain Science 2019年第6期16卷 1318-1339页

作者： LI Xiao-ning LING Si-xiang SUN Chun-wei XU Jian-xiang HUANG Tao School of Civil Engineering and Architecture Southwest University of Science and TechnologyMianyang 621010China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Disaster Prevention Research Institute Kyoto UniversityUjiKyoto 6110011Japan Productivity Promotion Centre of Aba Tibetan and Qiang Autonomous Prefecture Maerkang 624000China

This work addresses the integrated assessment of rockfall(including landslides) hazards and risk for S301, Z120, and Z128 highways, which are important transportation corridors to the world heritage site Jiuzhai Valley National Park in Sichuan, China. The highways are severely threatened by rockfalls or landslide events after the 2017 Ms 7.0 jiuzhaigou earthquake. Field survey(September 14-18 th, 2017, May 15-20 th, 2018, and September 9-17 th, 2018), unmanned aerial vehicle(UAV), and satellite image identified high-relief rockfalls and road construction rockfalls or landslides along the highway. Rockfall hazard is qualitatively evaluated using block count, velocity, and flying height through a 3D rockfall simulation at local and regional scales. Rockfall risk is quantitatively assessed with rockfall event probability, propagation probability, spatial probability, and vulnerability for different block volume classes. Approximately 21.5%, 20.5%, and 5.3% of the road mileage was found to be subject to an unacceptable(UA) risk class for vehicles along S301, Z120, and Z128 highways, respectively. Approximately 20.1% and 3.3% of the road mileage belong to the UA risk class for tourists along Z120 and Z128 highways, respectively. Results highlighted that high-relief rockfall events were intensively located at K50 to K55(Guanmenzi to Ganheba) and K70 to K72(Jiudaoguai to Shangsizhai Village) road mileages along S301 highway and KZ18 to KZ22(Five Flower Lake to Arrow Bamboo Lake) road mileages, KZ30(Swan Lake to Virgin Forests), and KY10.5 kilometers in Jiuzhai Valley. Rockfalls in these locations were classified under the UA risk class and medium to very high hazard index. Road construction rockfalls were located at K67(Jiuzhai Paradise) and K75–K76 kilometers along S301 highway and KZ12 to KZ14(Rhino Lake to Nuorilang Waterfall), KZ16.5 to KZ17.5(Golden Bell Lake), KY5(Lower Seasonal Lake), and KY14(Upper Seasonal Lake) kilometers along Z120 and Z128 highway in Jiuzhai Valley. Rockfalls in these areas were within a rea

关键词： Rockfall Hazard assessment Risk assessment 3D simulation model Highway jiuzhaigou earthquake

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

jiuzhaigou Ecotourism Areal System:Temporal Evolution of Entropic Change

引用

Wuhan University Journal of Natural Sciences 2008年第3期13卷 303-308页

作者： SHEN Xingju SU Chunjiang LI Weiji Institute of Mountain Hazards and Environment ChineseAcademy of Sciences Chengdu 610041 Sichuan China College of Tourism and Historical Culture SouthwestUniversity for Nationalities Chengdu 610041 Sichuan China

The temporal evolution of entropy of jiuzhaigou ecotourism areal system has been quantitatively analyzed by using equation of system entropy V = k In M - k In C. The computed entropy for jiuzhaigou ecotourism areal system for 20 years indicates a negative value during 1986-1996, which implies that the system had remained a healthy state during this period. The system entropy value, however, showed a constant increase since 1996 until it turned to be positive in 2000 when the system became chaotic. After 2000 the entropy value declined until 2003 when it escalated once again. By analyzing the causes and process of entropy change of the system, it is argued that fluctuation of entropy value is due to the overloading of tourist service capacity by tourism activities. It is desired to curb the flow of tourist volume and reinforce conservation efforts as well as, so that an ideal balance between conservation and development could be maintained.

关键词： jiuzhaigou system entropy ecotourism chaotic degree evolution

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：