海洋地质与第四纪地质2026，Vol.46Issue(3)：57-67,11.DOI:10.16562/j.cnki.0256-1492.2025040702
内波影响下南海东沙海底沙波发育及迁移演化研究
Development,migration and evolution of submarine sandwaves in the Dongsha Atoll of the South China Sea under the influence of internal waves
摘要
Abstract
Submarine sandwaves are common undulating sandy landforms in estuaries,bays,continental shelf,and continental slope regions.Due to the fact that their morphological development characteristics can reflect the regional hydrodynamic environment,they have attracted extensive attention from scholars.Under the action of marine hydrodynamic forces,submarine sandwaves could migrate,which is likely to cause hazards such as the suspension and burial of submarine pipelines,the silting of nearshore channels,and the overturning of offshore oil and gas platforms.Therefore,the study on submarine sandwaves is of great theoretical significance and engineering value.Based on the field observation work carried out in the sandwave area in the northeast of the Dongsha Atoll in the South China Sea in 2020 and 2022,the morphological development characteristics,migration and evolution processes,and dynamic sources of the sandwaves in this area were analyzed.Results indicate that the observed sandwaves developed at 700～830 m water depth with wave length of 140～400 m and wave height of 1.4～16.5 m,could be classified as giant sandwaves.By the calculation with the Shields parameter,we found that both the distribution direction of the crest lines and the migration direction of the sandwaves in the study area were mainly influenced by the regional internal tide.Under the influence of the internal tide,the crest lines of the sandwaves were distributed along the NNE-SSW direction and migrate towards the NWW direction at speed of 10 m/a.These findings enriched our understanding of the development characteristics of deep-sea sandwaves in the Dongsha Atoll of the South China Sea,provided a new perspective on the influence of internal waves on the migration and evolution of deep-sea sandwaves,and contributed to more systematic research on deep-sea sandwaves.关键词
深海沙波/沙波迁移/内孤立波/内潮/沉积物再悬浮Key words
deep-sea sand waves/sandwave migration/internal solitary waves/internal tide/sediment resuspension分类
海洋科学引用本文复制引用
张腾龙,刘晓磊,陆杨,李伟甲,安茂国..内波影响下南海东沙海底沙波发育及迁移演化研究[J].海洋地质与第四纪地质,2026,46(3):57-67,11.基金项目
海南省自然科学基金项目(426JCQN0975) （426JCQN0975）
山东省自然科学基金项目(ZR2025QA02) （ZR2025QA02）
国家自然科学基金项目(42507283) （42507283）
