Laboratory model tests on geosynthetics application for protecting the coastal cliff erosion

As well as the sand erosion, the cliff erosion has still been an important issue to be solved from a viewpoint of the disaster prevention, environmental maintenance and landscape at the coastal area. In these five years the authors have been making an extensive effort to investigate the characteristics of the cliff erosion at laboratory and at fields of the coastal area in Northern Ibaraki. Among them, the present paper highlights the results from the wave tank model tests at laboratory which were carried out to investigate on what kind of the countermeasure method was most effective to protecting the coastal cliff erosion. As far as the countermeasures using the geosynthetics, were concerned, it was concluded from them that the geosynthetic-folded filter unit including the stone wastes inside was most promising enough for the present purpose.