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	Investigation of loess positive and negative terrains based on DEMs - A case study in northern Shaanxi province
	Zhou, Yi ; Tang, Guoan ; Xiao, Chcnchao
	2009
英文摘要	China loess plateau is world-wide famous for its peculiar and unique landforms. The loess positive and negative terrains (hereafter called P-N terrains for short) which are separated by shouderlines play a significant role in the study of loess landform evolution, erosion process and environment protection. This study expatiate the conceptual model of the loess P-N terrains, including its characteristics, demarcation method as well as quantifying indices. Then a DEM based P-N terrains automatic extraction method called 'Butterfly Wings Operator' (BWO) was proposed. Tests in the loess Yuan and MaoLiang areas showed that this method had relatively high application adaptability and the area difference between positive terrains extracted from DEMs and reference results delineated on DOMs at the same location is less than 1.07km2 per 100km2.Based on this, P-N terrains of 48 geo-morphological units were extracted from 5m resolution DEMs and a series of thematic maps about the spatial distribution of the proposed indices were generated in the loess area in northern Shaanxi province. P-N terrains' indices spatial distribution rule was accordant to that of the loess relief character. This study also proved that positive terrain only accounted for 60.5% of the total loess area in northern Shaanxi currently. Thus it is imperative to strengthen soil and water conservation work in this area. ? 2009 Faculty of Construction and Land Use, The Hong Kong Polytechnic University.; EI; 0
语种	英语
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/327490]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhou, Yi,Tang, Guoan,Xiao, Chcnchao. Investigation of loess positive and negative terrains based on DEMs - A case study in northern Shaanxi province. 2009-01-01.

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