检索结果-南通市图书馆

Scaling behavior of magnitude clusters in aftershock sequence:An example of the Wenchuan Earthquake,China

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2012年第3期55卷 507-512页

作者： ZHANG Bin SHI Kai LIU ChunQiong YAO LingKan DI BaoFeng ai nanshan Land and Resources College China West Normal UniversityNanchong 637009China Key Laboratory of Ecotourism's Application Technology of Hunan Province Jishou UniversityJishou 416000China College of Biology and Environmental Sciences Jishou UniversityJishou 416000China Department of Road and Railway Engineering Southwest Jiaotong UniversityChengdu 610031China College of Architecture&Environment Sichuan UniversityChengdu 610065China

The Gutenberg-Richter and Omori Laws, which are generally used to characterize the temporal distribution of aftershock, failed to reflect the statistic properties of climatic outbreak of aftershock energy. Based on a new concept of magnitude clusters describing the fluctuation of aftershock energy release of the Wenchuan Earthquake, we discovered that the pattern of the continuous high-magnitude aftershock follows a power-law rather than a non-Poisson distribution. This suggests that the after-shocks with high magnitudes are statistically clustered. We then divided the aftershock sequences into three sections and demonstrated that though the probability of strong outbreaks decreased with time, there exists a high possibility of the occurrence of isolated high-magnitude aftershocks in the future. Based on self-organized criticality theory, the mechanisms of the power-law pattern of magnitude clusters are discussed. This discovery may be used to guide future aftershock predication and the associated post-disaster reconstruction.

关键词： scaling behavior magnitude clusters aftershock sequence Wenchuan Earthquake

Analysis of Ecosystem Degradation Factors in Yuanmou Arid-Hot Valleys Based on Interpretative Structural Model

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural Sciences 2008年第3期13卷 279-284页

作者： ZHANG Bin LIU Gangcai ai nanshan SHI Kai SHU Chengqiang Land and Resources College China West Normal UniversityNanchong 637002 Sichuan China Institute of Mountain Hazards and Environment Chinese Academyof Sciences Chengdu 610041 Sichuan China College of Architecture and Environment Sichuan UniversityChengdu 610065 Sichuan China

For ecological restoration and reconstruction of the degraded area, it is an important premise to correctly understand the degradation factors of the ecosystem in the arid-hot valleys. The factors including vegetation degradation, land degradation, arid climate, policy failure, forest fire, rapid population growth, excessive deforestation, overgrazing, steep slope reclamation, economic poverty, engineering construction, lithology, slope, low cultural level, geological hazards, biological disaster, soil properties etc, were selected to study the Yuanmou arid-hot valleys. Based on the interpretative structural model （ISM）, it has found out that the degradation factors of the Yuanmou arid-hot valleys were not at the same level but in a multilevel hierarchical system with internal relations, which pointed out that the degradation mode of the arid-hot valleys was ＂straight （appearance）-penetrating-background＂. Such researches have important directive significance for the restoration and reconstruction of the arid-hot valleys ecosystem.

关键词： interpretative structural model ecosystem degradation factors the arid-hot valleys

Classification and detection of dominant factors in geospatial patterns of traditional settlements in China

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2022年第5期32卷 873-891页

作者： WU Shaolin DI Baofeng Susan L.USTIN Constantine A.STAMATOPOULOS LI Jierui ZUO Qi WU Xiao ai nanshan College of Architecture and Environment Sichuan UniversityChengdu610065China Institute for Disaster Management and Reconstruction Sichuan University-The Hong Kong Polytechnic UniversityChengdu610207China John Muir Institute of the Environment University of California DavisDavisCA95616USA Stamatopoulos and Associates Co.&Hellenic Open University Athens11471Greece

The geospatial distribution pattern in traditional Chinese settlements(TCSs)reflects the traditional harmony between humans and nature,which has been learned over ***,TCSs have experienced serious disturbances by urbanization and *** is crucial to explore the local wisdom of geospatial patterns and dominant factors for TCSs at the national scale in *** study sought to determine the geospatial wisdom of traditional settlements to enrich our future settlement development with the aim of establishing Chinese settlement values for modern ***,a dataset of 4000 TCSs were analyzed and clustered for environmental factors that affect their geospatial patterns by machine learning *** concluded that(1)five geospatial patterns of TCSs were clustered on a national scale,and the threshold of environmental factors of TCS groups was detected.(2)Environmental conditions and settlement concepts interacted and determined the similarities and differences among TCS groups.(3)The key boundary for TCSs and the dominant factors for each zone were determined,and topographical conditions and hydrologic resources played significant roles in all five TCS *** study provides a better understanding of the adaptability of the environment in relation to the TCSs and aids in planning TCS conservation and rural revitalization.

关键词： rural settlements geographical pattern rural revitalization traditional wisdom

A Study of Debris Flow Block on the Model ofPercolation

在线全文

学校读者我要写书评

暂无评论

Communications in Nonlinear Science and Numerical Simulation 1999年第3期4卷 3-5页

作者： Yaquan FANG Houqiang LI nanshan ai and Wenfeng LUO(Department of Physics, Sichuan University, Chengdu 610064, ChinaE-mail: yaquan@***) Department of Physics Sichuan University Chengdu 610064 China

IlltroductionDebrisflow,oneoftheimportantnaturalphenomenathatcausesalotofdisastersinmanyregionsofChinahasbenstudiedalotaboutitscause,structure,composition,harmprevefitionandmanagemellt['--'***... 详细信息

IlltroductionDebrisflow,oneoftheimportantnaturalphenomenathatcausesalotofdisastersinmanyregionsofChinahasbenstudiedalotaboutitscause,structure,composition,harmprevefitionandmanagemellt['--'***...

关键词： percolation renormalization debris flow self-similar

A Systematic Analysis of Human Activity on Landform Evolution of Loess Plateau——Taking loess plateau area in Gansu Province as an example

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

新疆大学学报(自然科学版) 1989年第4期 91-99页

作者： Xu Jianhua ai nanshan (Department of Geography,Lanzhou University,China)

It is common knowledge that landform evolutionary process is controlled bytwo processes,endogenic forces processes,and exogenic forces *** and exogenic forces processes history is as long as the earth’s *** with landform evolutionary history,human history is a very *** people have to undertake cultivation,animal husbandry and otherproductive activities for their living since they came to the *** affectslandform evolutionary ***,the effect of human activity on landformevolution of loess plateau is becoming more and more violent for several thou-sand *** erosion is one of very important landform evolution pheno-menon of loess *** authors have studied water-soil erosion of loess pla-teau area in Gansu province as example,analyzed the effect of human activity onwater-soil *** the position and the effect of human activity on landformevolution of loess plateau have been shown from one point.

关键词： human activity landform evolution plateau

ECO-ENVIRONMENT CONSTRUCTION IN WEST DEVELOPMENT:FROM THE ECOLOGICAL PERSPECTIVE

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Natural Disaster Reduction in China 2002年第1期 20-24页

作者： ai nanshan (College of Environmental Sciences and Engineering, Sichuan University, Chengdu 610041, China)

Minority population and sustainable development in mountain regions a case study of the Tibetan inhabited region in Sichuan, China

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 1998年第4期8卷 12-20页

作者： CHEN Yong HE Ginxi Institute of Population Research, Sichuan University, Chengdu 610064, CHINA ai nanshan Institute of Environmental Science & Engineering, Sichuan University, Chengdu 610064, CHINA

China boasts 56 nationalities who are mostly inhabited in the sparsely populated mountain regions in West China. Like many other places in the Han nationality distributed regions, minority nationality inhabited regions are also facing the challenge of sustainable development in terms of both natural and human factors. Taking the Tibetan inhabited regions (TIR) in Sichuan Province as a case, this paper points out some major problems in the process of economic development in perspective of sustainability and leaves some hints for development strategies. While natural conditions such as geological instability are playing a major role to the environmental degradation, human activities and improper use of resources might constitute an important agent in the environmental deterioration. In order to promote local economic development and improve people’s living standard, sustainable planning is expected to be made and people’s awareness of sustainability should be strengthened.

关键词： Tibetan inhabited region (TIR) minority population sustainable development development strategy.

Effect of sediment on concentration of dissolved phosphorus in the Three Gorges Reservoir

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2011年第1期26卷 87-95页

作者： CAO Zhijing~1,ZHANG Xinbao~2,and ai nanshan~3 Institute of Architecture and Environment,Sichuan University,Chengdu 610065,China, Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041, China, Institute of Architecture and Environment,Sichuan University,Chengdu 610065,China, Lecturer Institute of Architecture and Environment Sichuan University Chengdu 610065 China Prof. Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China Prof. Institute of Architecture and Environment Sichuan University Chengdu 610065 China

Eutrophication and algal bloom has been occurring in the Three Gorges Reservoir ever since the reservoir’s impoundment in *** concentration of dissolved phosphorus(DP) is one of the main controlling factors for algal *** sediment adsorbs DP thereby affecting the concentration of DP. The effect of the sediment reduction on the DP concentration of the Three Gorges Reservoir is discussed in this *** were taken from the Yangtze River and its tributaries,*** Minjiang River and the Tuojiang *** DP concentration of the water samples and the available phosphorus,total phosphorus,and phosphorus-fixing capacity of the sediment samples were *** amount of phosphorus adsorbed by the sediment was about 3%of the total DP load in the Yangtze *** experiment was done in the lab simulating the DP concentration,sediment concentration,and turbulence. The results showed that quite a high amount of DP was adsorbed by the *** adsorption capacity of the sediment was 135 mg/kg and the highest rate of adsorption was 29 mg/kg·*** Xiluodu Dam is located at nearly 1,100 km upstream of the Three Gorges *** Xiloudu Dam will trap sediment and thence reduce the sediment load entering the Three Gorges Reservoir after impoundment in *** is estimated that the sediment reduction due to the Xiluodu Dam may result in an increase of the DP concentration in the Three Gorges Reservoir by 6.8%.

关键词： Dissolved phosphorus Sediment load reduction Three Gorges Reservoir Adsorption capacity Eutrophication

外营力地貌作用随机特性和分形布朗地貌的稳定性

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地理研究 1998年第1期17卷 23-30页

作者：艾南山朱治军李后强四川联合大学物理系

通过建立外营力地貌作用的分形模型，揭示了外营力在微观上塑造地表不平的动力机制。外营力在宏观和微观上具有各自的表现，可能预示地貌空间尺度的差异，使演化具有不同的独特规律。

关键词：外力过程分形布朗运动地貌分形布朗地貌