The influencing factor analysis of geomorphologic development of karst drainage based on DEM

Karst drainage is a regional synthetic system that is made up of spatial drainage boundary,unique landform,river system structure and hydrologic dynamic processes and has its own special drainage structure.Thus,there are complicated and diversified factors that influence the Karst drainge geomorphologic development.Except for rock character and climate,there are very important factors for Karst basin water-streams and Elevation,basin slope,basin Cutted degree and earth's surface morphology Characteristics of Karst drainage.On the basis of DEM,TM and CBERS of 32 Karst drainages,the five important factors of affecting geomorphologic development are analyzed,and 25 indices are retrieved.Data processing and principal component analyzing have been done based on Spss and Matlab softwares,and nine principal components are gotten.It concludes that the factors to affect Karst geomorphologic development from big to small are the characteristic of Karst basin streams and elevation,basin slope,basin cutted degree and earth's surface morphology characteristics of Karst drainage.