제주 서남부 연안 환경친화형 해상풍력 연계 해저송전선로 보호방안에 대한 연구

Abstract

The purpose of this study to derive the best protection method of the undersea transmission line from offshore wind farm in southwestern coast of Jeju Island. The undersea transmission line is laid on the seabed surface from the offshore wind farm to the land. Since the transmission lines are placed on the seafloor, it is difficult to determine with the naked eye and it may result in damage to submarine cables due to a variety of reasons such as fishing boat, anchor, marine construction, natural disasters, etc. For this reason, the protection methods of undersea transmission line is very important factors to prevent from damaging to submarine cables. The protection methods of undersea transmission lines can be divided into three types : burying methods, direct cable protection methods and indirect cable protection methods. The results are as follows. First, it is advisable to apply the protection methods of burying and digging when water depth is up to DL(-)3.7m. Second, direct cable protection methods are suitable for applying the steel pipe in all sector regardless of burying and digging. Third, under the condition of no burying and digging, there are three methods of indirect cable protection depending on the water depth. When the water depth is shallower than DL(-)10.0m, it is fit to apply Stone bag(12ton, two line and triangle binding). At the water depth between DL(-)10.0m and DL(-)20.0m, it is recommended to use FCM or smaller Stone bag than the Stone bag of 12ton. When the water depth is deeper than DL(-)20.0m, it is a good choice to apply Rock berm for the submarine cable protection methods