Author(s): Kazuya Watanabe; Hitoshi Tanaka
Linked Author(s): Hitoshi Tanaka
Keywords: River mouth; Natori River; Water depth estimation; Water level variation
Abstract: Sand spit development can be seen at wave-dominated river entrances. During a flood, sand spit may cause back water effect and resulting inundation damage in the surrounding area. It is thus necessary to make thorough understanding of sand spit behavior. In spite of the importance of morphology data at a river entrance, sufficiently frequent data acquisition is rare due to its high cost for field surveying. Considering this situation, the authors have proposed a method to estimate topographical information from measured water level variation. (Watanabe and Tanaka, 2003). However, its applicability to real field data was not sufficiently examined. In this study, two methods of water depth estimation are applied to field data at Natori River mouth for the periods before and after a flood, which caused abrupt change in water depth at the river mouth.