ACCURACY OF AN ESTIMATION METHOD OF WATER DEPTH AT A RIVER MOUTH USING WATER LEVEL VARIATIONS

摘要

It is observed that the water level variation inside and outside the Natori River mouth shows distinct difference after the formation of sand spit at the mouth, although the difference is not so remarkable after flushing of the spit during a flood. Using a simple model for an inlet-bay system, an estimation method is proposed to calculate water depth at the throat section of the river mouth from measured water level variation. Detailed investigation is carried out for the accuracy of the estimation method.