METHOD OF DEVELOPING ARTIFICIAL TIDELAND, AND EARTH RETAINING SUBMERGED BREAKWATER FOR DEVELOPING TIDELAND

PROBLEM TO BE SOLVED: To provide a method of developing an artificial tideland which can be maintained over a long time, and to provide an earth retaining submerged breakwater for use in developing the reclaimed tideland. SOLUTION: The method of developing the artificial tideland is carried out by constructing the earth retaining submerged breakwater 10 having a height about a low-water level LWL in the offing of a coast 1 along which the artificial tideland is developed, forming a breaker surface on an upper surface 11 of the earth retaining submerged breakwater 10 so as to decline from a coast side to an offshore side at an angle θ at which offshore waves 5 can be broken, placing tideland developing materials 20 at a location adjacent to a coast-side edge of the upper surface 11 of the earth retaining submerged breakwater 10, and allowing the developing materials 20 to be transported toward the coast with the help of broken waves 6 or a current, to thereby develop the tideland 21 between the earth retaining submerged breakwater 10 and the coast 1. Preferably an earth mounting area 16 having a height lower than that of the upper surface 11 of the earth retaining submerged breakwater 10 is formed on the coast side of the upper surface 11, and the developing materials 20 mounted on the earth mounting area 16 are transferred toward the coast with the help of the broken waves 6 or the current. In this case, preferably a depth of water of the earth mounting area 16 is set to less than 2 m. More preferably the angle θ at which waves at the upper surface 11 of the earth retaining submerged breakwater 10 can be broken, is set to 6 to 18 degrees, and a width W of the same in a coast-offing direction is set to 0.3 to 0.5 times a wavelength L of the offshore waves 5. COPYRIGHT: (C)2007,JPO&INPIT