In this report we describe the experiment conducted to know the changes of various surrounding conditions in the case of the entrusion of tsunami after the construction of Tsunami Breakwater at the port of Kochi. The main purpose of the present experiment was to perform the model tests of the score-prevention work against the local and sea bottom scoring at the vicinity of the mouth of Tsunami Breakwater.
　The effects of the score-prevention work are examined in comparison with the previous prerimental results described in the preceding report.
　The model used in the experiment, whose scale is 1/100 both in horizontal and in vertical, consists of the limitted region of water channel which is necessary for the investigation of scoring at the vicinity of the mouth of Tsunami Breakwater. As for the scoreprevention works, a few different cases have been examined experimentally where the bottom is paved directly with the blocks.