Pre-Quaternary paleotopography reconstruction in the Ordos platform and its integration in the loess landform evolution modeling

TitlePre-Quaternary paleotopography reconstruction in the Ordos platform and its integration in the loess landform evolution modeling
Publication TypeBook Chapter
Year of Publication2015
AuthorsXiong, Liyang, and Guoan Tang
Secondary AuthorsJasiewicz, Jaroslaw, Zbigniew Zwoliński, Helena Mitasova, and Tomislav Hengl
Book TitleGeomorphometry for Geosciences
Pagination35 - 38
PublisherBogucki Wydawnictwo Naukowe, Adam Mickiewicz University in Poznań - Institute of Geoecology and Geoinformation
CityPoznań, Poland
ISBN Number978-83-7986-059-3
Abstract

The information underlying the earth surface is the indicator of the environment of the past. Especially the pre- Quaternary underlying terrain of the Ordos platform in the Loess Plateau of China, a base level of soil erosion process and a start geologic node of loess deposition process during the landscape evolution process, which acted as the erosion base to control the development and evolution of the loess landform. In this study, on a basis of multi-source information including detail geologic information, several drillings, RS images and DEMs, we used GIS spatial analysis methods to virtualize and reconstruct a digital elevation model of a pre-quaternary paleotopographic surface in a severe soil erosion area of the Loess Plateau. Then, several indicators are used to quantitatively express the controlling effect of the underlying terrain to the modern terrain. Finally, we used the underlying terrain as the initial topography, employed a landscape evolution model to virtualize the process of the loess landscape formation process. The result shows, the usage of geologic information, together with the GIS spatial analysis method, could help the Geomorphometry in the virtualization of the paleotopography as well as the past environment. A relatively strong landform inheritance relationship could be found according to the significant linear positive correlation between both terrains. The Quaternary loess-deposition process exhibited an apparent accumulation in the windward direction, which supported the hypothesis of an eolian origin for loess in China. With the initial topography and landscape evolution model, we virtualize the evolution process of loess landform. Our results deepen the understandings of the paleotopography and the past environment of the Ordos platform in the Loess Plateau of China, as well as boarding the theory and method in Geomorphometry.

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