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	1. Dating of the River Terraces in Eastern Qilian Shan, Northwest China
	Pan Baotian,Gao Hongshan,Li Jijun
	Earth Science 10 November 2006
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	Abstract:The actively deformed foreland of eastern Qilian Shan (mountains) contains well-preserved geomorphic features such as river terraces and tectonically uplifted alluvial fans, providing suitable archives for research on regional tectonic activities and paleoclimatic changes. These geomorphic surfaces are well dated by using a combination of magnetostratigraphy, electron spin resonance (ESR), thermoluminescence (TL), infra-red stimulated luminescence (IRSL), radiocarbon dating, and correlation with the well-established loess-paleosol sequences of China. Our results show that the age of river terraces is 1.24 Ma, 820~870 ka, 780 ka, 420~440 ka, 230~250 ka, 140 ka, 60 ka and 10 ka, respectively. Repetitive stratigraphic and geomorphic pattern on these terraces indicate that climate variations play a significant role in controlling regional fluvial geomorphic evolution, even within this tectonic active regions.
	TO cite this article:Pan Baotian,Gao Hongshan,Li Jijun. Dating of the River Terraces in Eastern Qilian Shan, Northwest China[OL].[10 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9456


	2. 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


	3. DEM-based Watershed Topographic Attributes Extraction and Analysis
	Yuan Lifeng,Zhang Youshui
	Earth Science 03 November 2005
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	Abstract:n this paper we took Yan’er Gully watershed for an analysis instance, using ArcGIS software as a digital terrain analysis tool for studying topographic attributes extraction and analysis methods based on grid DEMs. The spatial and statistical distribution of topographic attributes were computed and compared. We assumed that a relative real DEM which is consistent with natural land surface can be produced through reconditioning basic material generated DEM and reprocessing DEM. We used mathematic statistics method and comparative analysis method to analyze effect of DEMs with different resolutions on the outcome of topographic terrain extraction, including elevation, slope, topographic index (i.e. ln (α/tan β)), watershed and subwatershed area, and drainage network. The analysis results of effect of DEM with different resolution on topographic attributes derived form DEMs indicated that terrain is smoothed, the mean value of slope decreases, the mean value of ln(α/tanβ) distribution i
	TO cite this article:Yuan Lifeng,Zhang Youshui. DEM-based Watershed Topographic Attributes Extraction and Analysis[OL].[ 3 November 2005] http://en.paper.edu.cn/en_releasepaper/content/3488

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