Abstract
Field observation was carried out to investigate beach erosion in Blue Bay area in Mauritius. The effectiveness of a method combined with a satellite image, in which field observation points are accurately shown, and field photographs with a scale such as a measuring stick was shown. In this area, severe beach erosion occurred in the past, but the exact cause was not clear. The cause was such that the longshore movement of sand supplied from the reef edge was obstructed by the construction of groins.
