多列砂州を有する大井川の河床変動特性と，流量時系列の変化が河床変動へ及ぼす影響

抄録

Physical environment should base on bar morphology which depends on river physical conditions. Complicated river morphology provides variation in hydraulics condition to river eco systems. And it gives some problems to river management.

This paper focuses on both multiple bars and braided channel at the downstream of the Ooi River. Characteristics of transformation on braided channel are important for river management because bank erosion problems often occur with braided channel move. So we tried to get more information about it from aerial photo and field observation. In this year, we got some results related to channel moving as follows. There are the relationships between number of bar mode and that of braided channel. And the rate that area of water surface exists in the area where water surface existed in the past aerial photos is very low. However, this rate recently becomes higher.