BASIN-SCALE ACESSMENT OF LONGITUDINAL FINE SEDIMENT DYANAMICS BY REMOTE SENSING TECHNIQUE

Abstract

 Remote sensing technique has enabled to depict the turbidity distribution not only at limited observation points but also throughout watersheds. In this study, turbidity maps were processed based on satellite data information (Sentinel-2). They were used to investigate the turbidity distribution in spatiotemporal manner in the Iwaki River basin (Japan). The characteristics of turbidity in each tributary were different in terms of intensity and duration, which were agreed with the rainfall distribution and geological structures. Turbidity distribution was converted into fine sediment discharge through rainfall-runoff model, and we confirmed the continuity of fine sediment discharge before and after the confluence of the tributaries.