STUDY ON INFLUENCE OF SEDIMENT DYNAMICS AND AYU BIOMASS BY SEDIMENT SLUICINGIN MIMIKAWA RIVER

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  • 耳川におけるダム通砂が土砂動態及びアユ現存量に及ぼす影響の検討

Abstract

<p> We evaluated the elucidation of river sediment dynamics and the impact on the ecosystem by sediment sluicing using UAV, SfM/MVS and environmental DNA for the Mimikawa River with the first three consecutive dams in Miyazaki prefecture. We could grasp the topography change caused by sediment sluicing in the water area where UAV photogrammetry is not applicable, using ArcGIS and the refraction correction factor. It was revealed that as the sediment transportation in the downstream of the dam was activated by sediment sluicing, depositional tendency near the dam and erosional tendency downstream from the dam have occurred. Our results suggest that the biomass of Ayu could have increased in the river because the environmental DNA concentration of Ayu in the downstream has increased with the activation of riverbed fluctuation by sediment sluicing.</p>

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