Abstract:
Geomorphic regionalization is the basis for the study of spatial differentiation of regional geomorphology, and it plays an important role in the geomorphological research work of Qinba Mountain area. The index of geographic linear density coefficient, which can account for the horizontal cutting degree of geomorphology, is one of the important standards in determining the geomorphic regionalization and drawing the geomorphological maps. Based on the grid digital elevation model and the extraction technology of geomorphic feature line, the feature line of landform types formed by the water erosion and denudation in Qinba Mountain area were extracted and analyzed, and the geomorphic cutting density coefficient of the middle-mountain, low-mountain and hilly areas were calculated in Qinba Mountain area, respectively. The reliability of geomorphic cutting density coefficient was also analyzed. The results showed that the geomorphic cutting density coefficients of the middle-mountain, low-mountain and hilly areas formed in Qinba Mountain area were 2.82, 3.53 and 3.83, respectively. Geomorphological cutting degree in water erosion and denudation areas was hilly area > low-mountain area > middle-mountain area.Moreover, there were differences in geomorphological cutting degree whether north or south sides of the Qinling Mountains. In particular, the difference of the middle-mountain area formed by water erosion and denudation was most significant in the north of Qinling Mountain.
