基于地形因子特征值的喀斯特流域地貌类型判别

利用数字地面高程模型进行子流域划分,提取反映喀斯特地貌形态的7个地形因子——高程、坡度、地形起伏度、地形粗糙度、地表切割深度、高程变异系数和地形指数,提出根据地形因子特征值进行喀斯特地貌类型判别方法。以贵州省后寨河流域为例,在划分的18个流域中,选取16个流域通过单个地形因子特征值相关分析和多个地形因子特征值模糊聚类分析,确定峰丛-洼地和峰林-盆地地貌类型判别的阈值,选取另外两个流域进行判别方法检验。结果表明:基于地形因子特征值可定量判别出喀斯特流域不同地貌类型。 

Categorization of karst landform on the basis of landform factor eigenvalue

In this paper, digital elevation model (DEM) is used to divide sub-basin and seven landform factors that affect the karst geomorphology, including elevation, slope, relief amplitude, surface roughness, surface incision and elevation variance coefficient as well as topographic index, are extracted. A method of terrain factor eigenvalue is proposed for categorizing karst landform. Houzhai basin was chosen to be divided into eighteen basins. Sixteen basins were selected to distinguish their landform type, and the other two are chosen for the method verification. The statistical analysis of a single landform factor and fuzzy cluster analysis of multi-landform factors of the landform factor eigenvalue are carried out in order to determine the threshold of the peak cluster and peak forest landform in the Houzhai basin. The results demonstrate that the method based on landform factor eigenvalue is suitable for quantitative categorization of karst basin landform.