太平洋海底光缆中国段路由条件及评价

根据在太平洋海底光缆中国段路由勘察中所获得的多波束、侧扫声呐、浅地层剖面、海洋磁力、柱状取样等资料,结合勘察区的自然环境特征,对路由区的自然环境条件、海底工程地质条件进行了详细的分析,并对该段路由条件进行了综合评价。研究发现,此段路由在大陆架路由区海底地形平缓,平均坡度小于2°,其中发现沙波、麻坑、冲刷沟等轻微不良地貌因素,跨越了黏土/粉砂、砂砾、砾/固结砂海底,地震活动少,地壳稳定性好,适合海底光缆铺设;在大陆架与大陆坡结合带地形起伏大,最大落差达500 m,发育有海底峡谷、海槽、陡坎等海底地形,路由条件相对较差,综合所获资料,针对路由不良区域进行了适当调整,并提出应对措施。调整后的路由基本适合海底光缆的铺设。

Conditions and Evaluation of the Route of China Segment in Pacific Submarine cable System

Based on survey with multibeam system, side scan sonar, subbottom profiler, magnetometer, gravity core sampler and other data obtained in the route survey area of Pacific Light Cable Network System China Segment, we analyzed and evaluated the natural environment and engineering geologic conditions in the route area in details including: seabed terrain is flat and the average slope is less than 2°;the route crosses clay/silt gravel gravel/consolidated sand seabed areas, slight bad geomorphic factors such as sand waves pit erosion ditch etc. ,the route area is suitable for cable laying . But in the region between continental shelf and continental slope the condition is undulating, with a maximum drop of 500m, Submarine canyon trench erosion valley scarp etc., are found in the route area, After adjusting the route in the area where condition is relatively worse, and appropriate measures should be taken before laying. The conclusion is that the natural and engineering environment of the submarine light cable route area is suitable for cable laying.