Author(s): Pan Ei Phyu; Gubash Azhikodan; Katsuhide Yokoyama
Linked Author(s):
Keywords: Riverbed changes; Sediment volume changes; Sediment rating curve and landslide disaster
Abstract: River morphological changes and spatial and temporal sediment load changes of the Chikugo River from 1998 to 2020 were reproduced using the HEC-RAS 1D sediment transport model. Survey data shows that the riverbed from midstream to upstream was almost stable (0.92 Mm 3) during the nodisaster period (P1,1998-2007). However, it increased during the disaster period (P2,2011-2020) with an increase in sediment volume (1.73 Mm3). The model successfully reproduced the elevation and sediment volume changes from midstream to upstream (P1:1. 01 Mm3 and P2:1. 7 Mm3) except for the tidal sediment transport. Sediment rating curves during P1 and P2 are analyzed individually and rating curves of P2 at 40 km and 50 km show higher sediment transport than P1. These results revealed that an increase in elevation and sediment load of the Chikugo River during P2 was caused by the landslide disaster.
Year: 2024