MECHANISM OF SAND DEPOSITION NEAR KATAKAI FISHING PORT LOCATED ON COAST WITH PREDOMINANT SOUTHWARD LONGSHORE SAND TRANSPORT

Abstract

 A large amount of sand was deposited in an area between the north breakwater and a jetty of Katakai fishing port, and it was calculated to be 7.7×10⁵ m³ in total with the mean rate of sand deposition of 4.5×10⁴ m³/yr between 1994 and 2011 on the basis of bathymetric survey data. This rate is in good agreement with the value of 4.9×10⁴ m³/yr calculated from the numerical simulation using the contour-line change model. Furthermore, southward longshore sand transport turning around the tip of Katakai fishing port has been trapped, resulting in the excessive deposition of sand in an area immediately south of north breakwater because of the extension of a jetty of 650 m length.