四万十川におけるアユの産卵に適した環境場の抽出と出水後の予測に関する研究
キーワード:
sweet fish,
spawning ground,
rapid and pool,
penetration test of riverbed,
two-dimensional bed formation analysis
2017 年 23 巻 p. 687-692
詳細
2017 年 23 巻 p. 687-692
In the Shimanto River, the catch of sweet fish has been decreasing in recent years, main causes of the decrease are reduction of rapids for the spawning grounds.
In this paper, we conducted detailed riverbed shape measurement before and after the flood using the UAV photogrammetry technique and survey of riverbed penetration near the spawning ground of sweet fish. Environmental conditions were extracted from the results of flow analysis during flood and the results of the search on the spawning ground, and the possibility of prediction of the formation condition of the spawning ground after the flooding was examined from the two-dimensional bed formation analysis.
