Spatial Pattern Analysis of Area-Elevation Integral in Sichuan Province
Quantitative analysis of the relationship between the cross-sectional area and elevation by area-elevation integral(HI)can be used as a mark to divide the geomorphologic morphology and development stages of the watershed.Based on ASTER GDEM data and extracted by ArcGIS and related softwares,the area-elevation integral value(HI)of Sichuan province is calculated by the relief ratio method to explore the geomorphology development of watershed there.The results indicate the following:the HI value of Si-chuan province is 0.11～0.76,with an average value of 0.43,which suggests that Sichuan province is in the prime stage of geomorphic development on the whole,driven by combined action of many factors such as topography,structure and lithology;the spatial distribution of HI value presents a trend of higher in the west but lower in the east,and HI value is related to elevation,relief and slope;the influence of tectonic movement on the activity of fault zone affects the development of gemorphology,and the relationship be-tween lithology and geomorphology is mainly embodied in the anti-erosion ability of rocks.This study helps understand the development characteristics of watershed in Sichuan province and lay a foundation for the later study on watershed geomorphology evolution.
DEMhydrological analysisarea-elevation integralspatial patterngeomorphic development
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