2002 Volume 8 Pages 109-114
The Shiribetsu is the first -class river which is located in the southwest part of Hokkaido, has its source on the Mt.Fure-dake, flows along the foot of the Mt. Youtei, and fills the Sea of Japan. At the river mouth, because of the northwestern waves during the winter and littoral drift, some problems have been arisen due to the instability of the river mouth and development of sandbar. Namely, inland water problem, transportation problem of fishing boat in-and-out trough the river mouth and damage of ascension fishes, are becoming serious.
In the river-mouth region of the Shiribetsu, since various phenomena, such as water and sediment runoff, salt water ascension, development of sandbar, and littoral cunrrent are co -existing, the mechanism of the formation and stability of the mouth is complicated. Based on these situations, a research group on the Shiribetsu was formed in 2000, and studies and field survey are performed. This paper summarizes the investigation and research result of this research group.
