Effective countermeasure has been concerned with the issue of wind-blown sand from nourished beach to hinterland in Niigata West Coast. Although it has been confirmed that the countermeasure using number of fences is effectively worked so far, it is expected to reduce the number of fences for the cost reduction. In this study a trench trap which has been usually used as measuring method of wind-blown sand was excavated with the size of D=1m, W=5m and L=20m on the beach in February, 2008 to check the effectiveness as the countermeasure of wind-blown sand. Through the 5 times observation surveys, it was found that the trench trap itself was effectively functioned to prevent wind-blown sand, however, the most part of trench trap was filled with the wind-blown sand when strong winter wind would continue to blow for about one week.
