基于遥感的山区河流"断面-河段"形态特征分析OA

In mountainous rivers,the hydrological monitoring network is sparse,and the identification and analysis of large-scale river morphology form the foundation for runoff remote sensing monitoring in data-scarce regions.In this study,water-sur-face vectors of a mountain river were extracted from remote sensing data.An indicator system for cross-sectional morphological characteristics was established,and K-means clustering method was employed to identify the classification characteristics of cross sections and river reaches,as well as their combined classification features.The results show that:① according to the cluster a-nalysis results,cross-sectional morphology in the upper Jinsha River can be classified into five types,among which the symmetric canyon-controlled type(Type 0)accounts for 76.98%;the morphological characteristics are significantly associated with the hydrodynamic environment.② Reach morphological complexity increases with reach length(for reaches of 300～1 500 m,the number of clustered classes increases to 19).Short reaches are dominated by a single hydrodynamic process,whereas long reaches are strongly affected by terrain-flow interactions.③The mean ratio of water-surface width between the dry season and the flood season is 0.52,and a rightward bias of flood-season flow is observed(mean reach morphology index is 1.18),which is consist-ent with the Coriolis effect.These results provide a scientific basis for runoff estimation in data-scarce regions,hydrodynamic modeling of mountain rivers,ecological restoration,and flood-management practices.