Abstract
Water surface profile was investigated for a flood flow near the river mouth. where the initial densimetric Froude number, Fi0, based on the whole depth at the river mouth is more than unity. Model experiments for the dispersion of a river into the sea were performed and it was concluded that the present analyses are not directly applicable to the dispersion of rivers when Fi0 is less than 1.5. Thus a modified analysis was made for a flood flow in the neighbourhood of the river mouth. Precise measurements of the water surface profile were carried out in the river channel near the river mouth for a model flow as well as flood flows in rivers, and a rapid variation of the water surface which can not be described by the traditional analysis was observed. A new heoretical analysis was developed to predict the water surface profile near the river mouth.
