海南岛西部近岸海底沙波几何参数及其与环境变量的关联性分析  

Analysis of geometric parameters of submarine sand waves in the western coastal area of Hainan Island and their correlation with environmental variables

作　　者：何艺玮 马小川[1] 高敏[3] 龚腾 He Yiwei;Ma Xiaochuan;Gao Min;Gong Teng(Key Laboratory of Marine Geology and Environment,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;College of Geodesy and Geomatics,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]中国科学院海洋研究所海洋地质与环境重点实验室,山东青岛266071 [2]中国科学院大学,北京100049 [3]山东科技大学测绘与空间信息学院,山东青岛266590

出　　处：《海洋学报》2024年第2期52-63,共12页

基　　金：国家自然科学基金项目(42276057,41876035)。

摘　　要：在发育复杂海底沙波的海域,对整个海域沙波几何参数空间分布规律的定量研究较为少见,且沙波复杂几何参数与环境变量的关联性尚未厘清。基于海南岛西部实测水深数据、沉积物粒度数据和流速数据,量化和提取了研究区的环境变量;并利用沙丘参数自动提取和分析方法计算了复杂海底沙波的形态参数,分析了沙波几何参数之间及其与环境变量的相关性。结果表明:研究区海底沙波形态特征复杂多变,平均波长范围为64~340 m,平均波高为0.39~4.13 m。波高与陡峭度、背流面平均角度存在强正相关性,波长与对称度之间存在强正相关性,沉积物中值粒径与背流面平均角度和波高之间存在较强正相关性。研究区海底沙波的发育特征受水深的影响较小。潮流作用下沉积物运移方式以推移质运移为主,海底沙波受到的侵蚀作用较弱;沙波演化以垂向生长和迁移为主,沙波波高增长优先于波长增大。在稳定潮流背景下,区域沉积物供应以及沉积物粒度均能影响海底沙波的规模。Quantitative studies on the spatial distribution of geometric parameters of complex submarine sand waves in the developmental area are rare,and the correlation between the complex geometric parameters of sand waves and environmental variables has not been clarified.Based on measured data of water depth,sediment grain size and flow velocity in the western area of Hainan Island,the environmental variables of the study area were quantified and extracted.The morphological parameters of complex submarine sand waves were calculated using an automated extraction and analysis method,and the correlation between sand wave geometric parameters and environmental variables was analyzed.The results show that the morphological characteristics of submarine sand waves in the study area are complex and variable,with an average wavelength ranging from 64 to 340 m and an average wave height ranging from 0.39 to 4.13 m.There is a strong positive correlation between wave height and steepness,as well as between wave height and the average angle of the lee side.There is also a strong positive correlation between wavelength and symmetry,and a strong positive correlation between median sediment grain size and the average angle of the lee side and wave height.The development of submarine sand waves in the study area is less influenced by water depth.Under the action of tidal currents,sediment transport is mainly by traction,and the erosion of submarine sand waves is relatively weak.The evolution of sand waves is mainly characterized by vertical growth and migration,with wave height growth prioritized over wavelength increase.Under stable tidal flow conditions,regional sediment supply and sediment grain size can both affect the scale of submarine sand waves.

关 键 词：沙波几何参数 沉积物 相关性分析 分布特征 

分 类 号：P736.213[天文地球—海洋地质]