土師ダム下流におけるオオカナダモの繁茂・流失要因の検討

抄録

The purpose of this study is to elucidate the environmental conditions causing the community of overgrowth of the alien aquatic weed Egeria densa and to construct an appropriate management method.

In this study, unmanned aerial vehicle (UAV) was used to survey to quantify the cover degree of E. densa. In addition, environmental conditions that affect the cover degree of E. densa were explored by using fluid models, geographic information system (GIS)．The results of this study showed that the cover degree of E. densa can be easily quantified by using images taken by UAV and GIS. When the flow velocity was <1.0m/sec and the water depth was <2.0m, a high coverage area was confirmed irrespective of hydraulic conditions.