西北大学 城市与环境学院,陕西 西安 710127

地貌发育; 定量研究; GIS

Quantitative analysis of landform development in the typical small watershed in Loess Plateau Based on Geographic Information System
WANG Hui-yuan,LIU Wan-qing,ZHAN Qing-qing(College of Urban and Environmental Science,Northwest University,Xi'an 710127)

(College of Urban and Environmental Science,Northwest University,Xi'an 710127)

landscape development; quantitative research; GIS;



The Yellow River sediments mainly come from north shaanxi Loess Plateau,this paper chose typical small watersheds in Loess Plateau as research object.Hypsometric Integral is often used to reflect the landform erode stage and evolution process.As one of the important indicator of watershed evolution characteristics,Hypsometric Integral plays an important role in macroscopic quantitative analysis of landform evolution in watershed scale.On the basis of Davis' theory of erosion cycle,landform evolution in watershed can be divided into young stage,mature stage and old stage.The longer the evolution,the severe the erosion,and the shape of Hypsometric curve changed from initial convex to “S” and finally to concave,the Integral value is also ranged from 0.6 to 0.35.Based on the review of landform evolution and its quantitative research,this paper quantitatively described the development stage of landform evolution of typical small watershed in Loess Plateau by the use of Hypsometric Integral.In addition,a new method is proposed and tested.on the basis of different stages of landform evolution and achievements of several scholars,this paper tried to determine and analysis the development stage of watershed landform by the combine use of Geographic Information System,Geomorphology and geography,and ArcGIS and Excel as technology platform.the result shows that the watersheds are in mature stage,and erosion is relatively serious.Instead of Hypsometric Integral,volume elevation integral has similar results in experiment.although Hypsometric Integral is relatively accurate,volume elevation integral is more intuitive and visual,and faster in computation.In addition,its results are closer to actual fact,and it will be a reliable method to study the development stages of landform.