Abstract
Groins are facilities to control the sand drift for maintenance and the recovery of the shoreline. In Japan, impermeable groins with the concrete block are general. However, groins of the timber piles remain in the Netherlands, and there is a possibility to adopt permeable groins as a construction method also in Japan according to the needed function of littoral drift control. Moreover, the permeability of the groins is a control element as well as the length of the groin in moderately easing influence of the longshore sediment transport control to the downstream. The model experiments were done in a tank aiming to clarify control function of the permeable groins on littoral drift.
