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Investigation and Assessment of Landslides and Debris Flows in Sichuan Province of China by Remote Sensing Technique

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Chinese Geographical Science 2006年第3期16卷 223-228页

作者： ZHANG Baolei ZHANG Shumin zhou wancun Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Bering 100101 China Shandong Economic University Jinan 250014 China

Taking TM images, ETM images, SPOT images, aerial photos and other remote sensing data as fundamental sources, this research makes a thorough investigation on landslides and debris flows in Sichuan Province, China, using the method of manual interpretation and taking topography maps as references after the processes of terrain correction, spectral matching, and image mosaic. And then, the spatial characteristics of landslides and debris flows in the year of 2005 are assessed and made into figures. The environmental factors which induce landslides and debris flows such as slope, vegetation coverage, lithology, rainfall and so on are obtained by GIS spatial analysis method. Finally, the rela- tionships of landslides or debris flows with some environmental factors are analyzed based on the grade of each envi- ronmental factor. The results indicate: 1) The landslides and debris flows are mainly in the eastern and southern area of Sichuan Province, however, there are few landslides and debris flows in the western particularly the northwestern Si- chuan. 2) The landslides and debris flows of Sichuan Province are mostly located in the regions with small slope degree. The occurring rate of debris flow reduces with the increase of the vegetation coverage degree, but the vegetation cov- erage degree has little to do with the occurrence of landslide. The more rainfall a place has, the easier the landslides and debris flows take place.

关键词：遥感技术滑坡四川动力地质灾害

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Spatial Pattern of Rural Settlements in the Upper Reaches of the Minjiang River——a Case Study in Maoxian County, Sichuan

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Journal of Mountain Science 2007年第2期4卷 146-154页

作者： FENG Werdan LI Ainong zhou wancun Chengdu Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041SichuanChina Graduate School of Chinese Academy of Sciences Beijing 100039 China Chengdu Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041Sichuan China

A quantitative analysis of the spatial pattern of rural settlements in the upper reaches of the Minjiang River was made with the major data sources being the relevant ETM image and the national geographical database of China (including contour line, river and road) at the scale of 1:250 000, and using image interpretation and field investigation to obtain spatial information on rural settlements. The results of the spatial analysis technique of GIS and correlation analysis showed that most settlements (78.2 %) were located in the mountain area at 1500 ∼ 2700 m altitude, and almost half in the arid valley area. More than 80.0 % of settlements had their slopes above 15°. Most settlements had good access to water resources, roads and communications, and tended to cluster close to the road network rather than the river. About half of the rural settlements in the study area were relatively concentrated, while the others were decentralized. Those with higher altitude usually had land with steep slope, inconvenient water and road accesses, and were located far apart from each other. In view of such a situation, further research should be done to make reasonable countermeasures on these settlements for better living conditions and ecosystem stability.

关键词：农村聚落空间模式 GIS 中国

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Using Fuzzy Relations and GIS Method to Evaluate Debris Flow Hazard

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 875-881页

作者： SONG Shujun ZHANG Baolei FENG Wenlan zhou wancun Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041SichuanChina Graduate University of Chinese Academy of Sciences Beijing 100049China

The study area, located in the southeast of Tibet along the Sichuan-Tibet highway, is a part of Palongzangbu River basin where mountain hazards take place frequently. On the ground of field surveying, historical data and previous research, a total of 31 debris flow gullies are identified in the study area and 5 factors are chosen as main parameters for evaluating the hazard of debris flows in this study. Spatial analyst functions of geographic information system （GIS） are utilized to produce debris flow inventory and parameter maps. All data are built into a spatial database for evaluating debris flow hazard. Integrated with GIS techniques,the fuzzy relation method is used to calculate the strength of relationship between debris flow inventory and parameters of the database. With this methodology,a hazard map of debris flows is produced. According to this map,6.6% of the study area is classified as very high hazard, 7.3% as high hazard,8.4% as moderate hazard,32. 1% as low hazard and 45.6% as very low hazard or non-hazard areas. After validating the results, this methodology is ultimately confirmed to be available.

关键词： fuzzy relations geographic information system (GIS) debris flows hazard evaluation

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Remote Sense and GIS-Based Division of Landslide Hazard Degree in Wanzhou District of the Three Gorges Reservoir Area

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 780-786页

作者： zhou Qigang FENG Wenlan SONG Shujun YUAN Lifeng zhou wancun Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 Sichuan China Graduate University of Chinese Academy of Sciences Beijing 100049China

An evaluation model divided landslide hazard degrees in Wanzhou District of Three Gorges Reservoir Area. The model was established by GIS techniques and took land use/cover, stratum characters, slope aspect, slope gradient, elevation difference and slope shape as evaluation factors. The data of land use/cover were obtained by remote sensing, and the weights of the factors mentioned above were established by the analytic hierarchy process （AHP）. The results indicate, low danger areas in the studied area account for 66.51%, and high danger areas and very high danger areas occupy 1/3 of the total area. The regions of high and very high danger are mainly located around the urban area of Wanzhou District and on the banks of the Yangtze River with a relatively large area, where collapse and landslide directly threats densely populated areas and Three Gorges Reservoir. Slope destabilization, if occurs, will bring huge loss to social economy. All research results are consistent with the actual conditions; therefore, they can be regarded as a useful basis for planning and constructing of the reservoir area.

关键词： landslide hazard degree three gorges reservoir area landslide remote sense geography information system

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Assessment and Risk Zonation of Landslides in Panxi Area Based on 3S Technology

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 793-800页

作者： ZHANG Baolei SONG Shujun FENG Wenlan zhou wancun Institute of Mountain Hazards and Environment Chinese Academyof Sciences Chengdu 610041 Sichuan China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Based on field survey located by GPS, it is obtained landslides＇ location and distribution information by the method of remote sensing in this paper. The vector data of environmental factors that breed and induce landslides such as the elevation, the slope, the vegetation cover, the lithology, the rainfall and so on are gained using GIS（geographical information system） techniques of spatial analysis. All the data obtained are managed through building landslide management system. At the same time, the system is made the platform to appraise the relationship between the distribution of landslides and the environmental factors. The results indicate： landslides take place relatively easily in the slope range between 10° and 25°; most landslides are in the mixed area of bush and grass with a coverage degree of from 20° to 65°; the distribution of landslides has a positive relationship with the distribution of annual rainfall. The risk degree of Panxi Area is zoned and mapped by the model of liner stack using GIS technique, and the result indicates： the place of high risk degree is the belt of Panzhihua-Miyi-Dechang-Mugu and southeast of Huili county and Huidong county,and area is about 512 707 hm^2.

关键词： landslide 3S technology risk zonation Panxi Area

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Integrated Evaluation Model for Eco-Environmental Quality in Mountainous Region Based on Remote Sensing and GIS

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 969-976页

作者： LI Ainong WANG Angsheng HE Xiaorong FENG Wenlan zhou wancun Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 Sichuan China Graduate University of Chinese Academy of Sciences Beijing 100049China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029 China School of Resources and Environmental Engineering Wuhan University of Technology Wuhan 430070 Hubei China

Based on Remote Sensing （RS）, Geographic Information System （GIS）, and combining Principal Component Analysis, this paper designed a numerical integrated evaluation model for mountain eco-environment on the base of grid scale. Using this model, we evaluated the mountain eco-environmental quality in a case study area-the upper reaches of Minjiang River, and achieved a good result, which accorded well with the real condition. The study indicates that, the integrated evaluation model is suitable for multi-layer spatial factor computation, effectively lowing man＇s subjective influence in the evaluation process; treating the whole river basin as a system, the model shows full respect to the circulation of material and energy, synthetically embodies the determining impact of such natural condition as water-heat and landform, as well as human interference in natural eco-system; the evaluation result not only clearly presents mountainous vertical distribution features of input factors, but also provides a scientific and reliable thought for quantitatively evaluating mountain eco-environment.

关键词： eco-environment evaluation model spatial principal component analysis RS (remote sensing) GIS (geographic information system)

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GIS-Based Spatial Analysis and Modeling for Landslide Hazard Assessment:A Case Study in Upper Minjiang River Basin

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Wuhan University Journal of Natural Sciences 2006年第4期11卷 847-852页

作者： FENG Wenlan zhou Qigang ZHANG Baolei zhou wancun LI Ainong ZHANG Haizhen XIAN Wei Institute of Mountain Hazards and Environment Chinese Academy ofSciences Chengdu 610041 Sichuan China Graduate University of Chinese Academy of Sciences Beijing 100049China Department of Envioronmental Engineering Chengdu University of Information Technology Chengdu 610225 Sichuan China

By analyzing the topographic features of past landslides since 1980s and the main land-cover types （including change information） in landslide-prone area, modeled spatial distribution of landslide hazard in upper Minjiang River Basin was studied based on spatial analysis of GIS in this paper. Results of GIS analysis showed that landslide occurrence in this region closely related to topographic feature. Most areas with high hazard probability were deep-sheared gorge. Most of them in investigation occurred assembly in areas with elevation lower than 3 000 m, due to fragile topographic conditions and intensive human disturbances. Land-cover type, including its change information, was likely an important environmental factor to trigger landslide. Destroy of vegetation driven by increase of population and its demands augmented the probability of landslide in steep slope.

关键词： landslide probability spatial modeling upper Minjiang River

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Spatial patterns and driving forces of land use change in China during the early 21st century

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Journal of Geographical Sciences 2010年第4期20卷 483-494页

作者： LIU Jiyuan ZHANG Zengxiang XU Xinliang KUANG Wenhui zhou wancun ZHANG Shuwen LI Rendong YAN Changzhen YU Dongsheng WU Shixin JIANG Nan Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Institute of Remote Sensing Applications CAS Beijing 100101 China Chengdu Institute of Mountain Hazards and Environment CAS Chengdu 610041 China Northeast Institute of Geography and Agroecology CAS Changchun 130012 China Wuhan Institute of Geodesy and Geophysics CAS Wuhan 430077 China Cold and Arid Regions Environmental and Engineering Research Institute CAS Lanzhou 730000 China Nanjing Institute of Soil Science CAS Nanjing 210008 China Xinjiang Institute of Ecology and Geography CAS Urumqi 830011 China Nanjing Institute of Geography and Limnology CAS Nanjing 210008 China

Land use and land cover change as the core of coupled human-environment systems has become a potential field of land change science （LCS） in the study of global environmental change. Based on remotely sensed data of land use change with a spatial resolution of 1 km × 1 km on national scale among every 5 years, this paper designed a new dynamic regionalization according to the comprehensive characteristics of land use change including regional differentiation, physical, economic, and macro-policy factors as well. Spatial pattern of land use change and its driving forces were investigated in China in the early 21 st century. To sum up, land use change pattern of this period was characterized by rapid changes in the whole country. Over the agricultural zones, e.g., Huang-Huai-Hai Plain, the southeast coastal areas and Sichuan Basin, a great proportion of fine arable land were engrossed owing to considerable expansion of the built-up and residential areas, resulting in decrease of paddy land area in southern China. The development of oasis agriculture in Northwest China and the reclamation in Northeast China led to a slight increase in arable land area in northern China. Due to the ＂Grain for Green＂ policy, forest area was significantly increased in the middle and western developing regions, where the vegetation coverage was substantially enlarged, likewise. This paper argued the main driving forces as the implementation of the strategy on land use and regional development, such as policies of ＂Western Development＂, ＂Revitalization of Northeast＂, coupled with rapidly economic development during this period.

关键词： land use change spatial pattern driving forces the early 21st century China

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Spatiotemporal characteristics, patterns, and causes of land-use changes in China since the late 1980s

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Journal of Geographical Sciences 2014年第2期24卷 195-210页

作者： LIU Jiyuan KUANG Wenhui ZHANG Zengxiang XU Xinliang QIN Yuanwei NING Jia zhou wancun ZHANG Shuwen LI Rendong YAN Changzhe WU Shixin SHI Xuezheng JIANG Nan YU Dongsheng PAN Xianzhang CHI Wenfeng Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Institute of Remote Sensing and Digital Earth CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Chengdu Institute of Mountain Hazards and Environment CAS Chengdu 610041 China Northeast Institute of Geography and Agricultural Ecology CAS Changchun 130012 China Wuhan Institute of Geodesy and Geophysics CAS Wuhan 430077 China Cold and Arid Regions Environmental and Engineering Research Institute CAS Lanzhou 730000 China Xinjiang Institute of Ecology and Geography CAS Urumqi 830011 China Institute of Soil Science CAS Nanjing 210008 China Nanjing Institute of Geography and Limnology CAS Nanjing 210008 China

Land-use/land-cover changes （LUCCs） have links to both human and nature inter- actions. China＇s Land-Use/cover Datasets （CLUDs） were updated regularly at 5-year inter- vals from the late 1980s to 2010, with standard procedures based on Landsat TM／ETM＋ im- ages. A land-use dynamic regionalization method was proposed to analyze major land-use conversions. The spatiotemporal characteristics, differences, and causes of land-use changes at a national scale were then examined. The main findings are summarized as fol- lows. Land-use changes （LUCs） across China indicated a significant variation in spatial and temporal characteristics in the last 20 years （1990-2010）. The area of cropland change de- creased in the south and increased in the north, but the total area remained almost un- changed. The reclaimed cropland was shifted from the northeast to the northwest. The built-up lands expanded rapidly, were mainly distributed in the east, and gradually spread out to central and western China. Woodland decreased first, and then increased, but desert area was the opposite. Grassland continued decreasing. Different spatial patterns of LUC in China were found between the late 20th century and the early 21st century. The original 13 LUC zones were replaced by 15 units with changes of boundaries in some zones. The main spatial characteristics of these changes included （1） an accelerated expansion of built-up land in the Huang-Huai-Hai region, the southeastern coastal areas, the midstream area of the Yangtze River, and the Sichuan Basin; （2） shifted land reclamation in the north from northeast China and eastern Inner Mongolia to the oasis agricultural areas in northwest China; （3） continuous transformation from rain-fed farmlands in northeast China to paddy fields; and （4） effective- ness of the ＂Grain for Green＂ project in the southern agricultural-pastoral ecotones of Inner Mongolia, the Loess Plateau, and southwestern mountainous areas. In the last two decades, although climate

关键词： satellite remote sensing land-use change characteristics spatial pattern China

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REMOTE SESING INVESTIGATION AND APPRAISAL OF LAND USE AND CAPACITY IN THE REGION OF THE YANGTZE RIVER GORGES’PROJECT

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遥感信息 1990年第A2期12卷 43-44页

作者： zhou wancun (Chengdu Institue of Mountain Dissaster and Environment, Chinese Academy of Sciences)

The region around the Three Gorges project on the Yangtze River has an area of 62552 square kilometres and population of 20.14 million. It limits a range hetween the sorth-north watersheds and from Yichang of Hubei Province to Jiangjin of Sichuan, including 24 cities and counties-Chongjing, Yichang and Wanxian etc. In this region, relief are mainly hills and middle-low mountains. Remote censing investigation and appraisal of land use and capacity which are two of the major restrict factors for the Three Gorges project have provided related scientific bases for macro-dicision-making of the project.

关键词： PROJECT REMOTE SESING INVESTIGATION AND APPRAISAL OF LAND USE AND CAPACITY IN THE REGION OF THE YANGTZE RIVER GORGES

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