2024 Volume 80 Issue 17 Article ID: 24-17152
At the mouth of the Kurobe River flowing into Toyama Bay, alluvial sand from the river discharges into the deep sea through the steep seabed near the mouth along with the discharge of sand into a steep seabed offshore of the Aramata area located immediately south of the mouth. The rest of the sand discharged from the mouth is transported southward and finally discharges into the deep sea in the Ikuji area located south of the Kurobe River. Thus, shore protection of these areas closely relates to the longshore sand movement and offshore discharge of sand. Selecting the Aramata and Ikuji areas as the study area, beach changes were analyzed using the NMB survey data. As a result, it was found in the Ikuji area that 3×104 m3 of sand discharged at a once offshore of the detached breakwater of pile structures, and the seabed became unstable when the seabed slope exceeds 1/1.9, causing the landslide on the seabed.
