Monitoring and modeling of short-term morphology changes at a river entrance

Abstract

     It is known that morphology change occurs more rapidly at a mouth of small or medium rivers as compared with large rivers. This is mainly due to distinctly difference of fresh water and tidal discharge between small and large rivers, although corresponding wave forces are more or less similar between them. For river mouth management, accordingly, more frequent monitoring is highly required at small river mouths. However, such monitoring system enabling frequent acquisition of morphological information has not been established. In the present study, a monitoring method is proposed for topography change at a small and medium river mouth using an automated digital camera installed at a river entrance. Through the value of right and left sand spit, we can determine the river mouth width. By using measurement data, parameters for numerical model were also determined.