ABSTRACT

An area-wide digital geomorphological map consisting of 12,180 non-overlapping polygons was created for the Sulden river basin (South Tyrol, Italian Alps) with the purpose to carry out a GIS-based sediment connectivity analysis. Thirty-one landform types were defined with respect to their role within sediment cascades. As such, the classification and the related symbology partly differ from a traditional geomorphological map where several areal objects are frequently represented by scaled and rotated point symbols. The catchment (∼130 km²), exhibits a high geomorphological variability as well as relatively large glacierized areas. We used the geomorphological map for a first qualitative estimate of the main differences between the two major sub-basins concerning the components of the sediment cascades: while the Trafoi sub-catchment exhibits a high number of small landslides and debris flow channels (i.e. source and transport landforms), the Sulden sub-catchment is rather characterized by large proglacial and talus landforms (i.e. temporary storage landforms).

摘要

为进行萨尔登河流域（南蒂罗尔，意大利阿尔卑斯山）创建了由12,180个非重叠多边形组成的区域数字地貌图，目的是进行基于GIS的沉积物连通性分析。根据它们在泥沙瀑布中的作用，定义了31种地貌类型。这样，分类和相关符号系统在一定程度上不同于传统的地貌图，在传统的地貌图中，经常用缩放和旋转的点符号来表示几个面对象。流域（约130km²）具有较高的地貌变异性和相对较大的冰川面积。我们使用地貌图对两个主要子流域之间关于沉积物级联分量的主要差异进行了第一性定性估计：