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1. Numericle simulation of the formation of star dunes with DNS method | |||
Zhang Ruyan ,Luo Chunmei | |||
Earth Science 29 October 2010 | |||
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Abstract:In this paper, the star dunes with five arms are simulated numerically in order to make clear the mechanism of the formation. The numerical method employed in this study can be divided into three parts: (1) Calculation of the air flow above the sand dunes; (2) Estimation of the sand transfer caused by the flow through the friction; (3) Determination of the shape of the sand ground. Since the computational area has been changed due to the last step, these procedures are repeated until typical shapes of the sand dunes are formed. When the winds blow from five directions, the sand dune extends at five directions and becomes the shape of a star with five arms. | |||
TO cite this article:Zhang Ruyan ,Luo Chunmei. Numericle simulation of the formation of star dunes with DNS method[OL].[29 October 2010] http://en.paper.edu.cn/en_releasepaper/content/4389812 |
2. Research Status and Prospect of 3D Green Biomass Measures of Urban Forest | |||
Song Jinxiu ,Zhang Xiaoli | |||
Earth Science 22 October 2009 | |||
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Abstract:Three-dimension green biomass refers to the volume formed by stems and leaves of a plant. It overcomes the limitation of two-dimension indices, and more accurately reflects the rationality of the plant spatial constitution and the level of ecological benefit. This paper summarizes the research advances on TGB, expatiates its concept, introduces main calculate methods of TGB, and puts forward some key problems and the view on research direction of TGB measurement. The research of TGB measurement not only is important for the establishment of a city’s green database, but also provides an important index for the evaluation of urban green area. Therefore, it is useful for studying of the green environmental benefit. | |||
TO cite this article:Song Jinxiu ,Zhang Xiaoli . Research Status and Prospect of 3D Green Biomass Measures of Urban Forest[OL].[22 October 2009] http://en.paper.edu.cn/en_releasepaper/content/36007 |
3. Urban Expansion Analysis based on multi-temporal Remote Sensing and GIS in Wujiang, a typical Desakota in Sunan, China (1978-2004) | |||
ZHU Yuexia,ZHANG Xiaoxiang,A Huijuan | |||
Earth Science 18 April 2008 | |||
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Abstract:Rapid economic development during the last three decades has caused a large urban expansion in China, especially in the eastern and coastal areas of China. In these areas, a special urban expansion mode, Desakota (Semi-urbanization), is very popular. Wujiang, a typical Desakota are in Sunan, is chose as the research area to study the special urban expansion based on multi-temporal Remote Sensing and GIS. In this study, maximum likelihood supervised classification and post-classification change detection techniques were applied to Landsat MSS/TM images acquired in 1978, 1986, 1993, 2000, and 2004, respectively, to map land cover changes in the Wujiang, China. A supervised classification was carried out on the five images individually with the aid of ground truth data. Ground truth information collected during two field trips conducted between 2005, 2007 and land use map of 1997, 2004 were used to assess the accuracy of the classification results. Using ancillary data, visual interpretation and expert knowledge of the area through GIS further refined the classification results. Post-classification change detection technique was used to produce change image through cross-tabulation calculation. Changes among different land cover classes were assessed. During the study period, a very severe land cover change has taken place as a result of industrial and urban development projects. These changes in land cover led to cropland degradation in the study area. Result indicates the environmental impacts of urban sprawl of Wujiang. The research suggests that human activities, such as urbanization and industrialization, were playing a much more significant role in the change of land cover and landscape pattern during the last 30 years from 1978. | |||
TO cite this article:ZHU Yuexia,ZHANG Xiaoxiang,A Huijuan. Urban Expansion Analysis based on multi-temporal Remote Sensing and GIS in Wujiang, a typical Desakota in Sunan, China (1978-2004)[OL].[18 April 2008] http://en.paper.edu.cn/en_releasepaper/content/20641 |
4. POPULATION-DRIVEN URBAN EXPANSION MODELING: CASE STUDY | |||
Li Lin,Zhu Haihong | |||
Earth Science 06 December 2005 | |||
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Abstract:Urban expansion, as a dynamic process of land use change, may be linked with topography, transportation, land use, social structure and economic type, but it is generally related to demography and economy in a city. According to a physical diffusion process, population density is regarded as an internal driving factor for urban expansion. We will discuss methods to calculate population density based on statistical data and examine characteristics of urban expansion modeling based on population through two examples. On a regional scale, an approximate rank-size-rule may be applied to allocate the aggregated population data because of quite a lot of disconnected built-up areas in this region. At local scale, a negative exponential function may be used to distribute the total number of people of a city over its built-up areas, most of which are nearly connected with each other. | |||
TO cite this article:Li Lin,Zhu Haihong. POPULATION-DRIVEN URBAN EXPANSION MODELING: CASE STUDY[OL].[ 6 December 2005] http://en.paper.edu.cn/en_releasepaper/content/4105 |
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