地形地貌检测在琼州海峡500 kV海底电缆运维中的应用

Application of Geomorphology Survey for the Maintenance of 500 kV Submarine Cable in the Qiongzhou Strait

简要介绍了琼州海峡500 kV海底电缆地形地貌特点及保护方式,分析了侧扫声呐及多波束检测的基本原理,对侧扫声呐在海底电缆裸露及悬空检测的原理进行了重点阐述。结合海南联网500 kV海底电缆近几次检测数据,通过侧扫声呐地貌检测结果,重点对海底电缆裸露情况、抛石坝及铸铁套管保护状况、海底电缆周围异常进行了分析,能够正常检测出海底电缆的裸露、抛石坝的坍塌及周围异物等异常情况。通过多波束地形检测结果,分析了海底电缆路由区域整体地形状况及抛石坝整体状况、通过Kriging插值方法生成不同的DEM(数字高程模型,Digital Elevation Model),分别从宏观和微观角度对海底电缆路由区域地形冲淤变化进行了分析,并对沙波稳定性进行了分析。结论认为,部分区域地形冲刷严重,容易造成海底电缆裸露、悬空,需要及早关注并采取防冲刷措施。

The topographical features and protection methods of the 500 kV submarine cable in the Qiongzhou Strait are briefly introduced,so the basic principles of cable routing survey with side scan sonar and multi-beam bathymetry,in which the principle of side scan sonar in the submarine cable bareness and suspending detection is highlighted.It is analyzed in detail about the recent survey data about 500 kV submarine cable of the Hainan Interconnection Project.For the side scan sonar geomorphology survey results,the key analysis focuses on the bareness of the submarine cable,the protection status of the rock-dumping,the cast iron,and the anomalies around.Obviously,abnormalities such as bareness,collapse of the rock-dumping,as well as foreign body around,could be detected correctly.For multi-beam terrain detection results,the overall topographical condition of the submarine cable routing area and the status of the whole rock-dumping are analyzed.The different DEM(Digital Elevation Model)is produced by using Kriging interpolation method,then the terrain erosion and deposition changes in the routing area are discussed from the macroscopic and microscopic.The stability of the sand wave is also analyzed.It is proved that it is scoured extremely seriously for the terrain in some areas of the cable routing,which could easily cause the submarine cable to be exposed and suspended.So it is quite necessary to pay attention in an early manner and take anti-scouring measures.