DISTRIBUTION PATTERN AND CONTROL FACTORS OF SAND WAVES IN SOUTHEAST BEIBU GULF
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摘要:
北部湾东南海域海底发育大量沙波，利用最新获得的多波束测深、沉积物和水动力数据对沙波形态和分布特征进行综合分析，探讨沉积物特征、水动力条件，海平面变化等不同控制因素对海底沙波发育及分布的影响。结果表明研究区沙波广泛分布于沙脊顶部、沙脊槽中线附近及沙脊槽北端，沙波呈现远岸区尺度较小、对称性较好，近岸区尺度较大、多不对称的分布特征。海底沙波的发育和分布受现代潮流作用和沉积物特征的共同控制。潮流通道及流速的分布情况与沙波形态、规模的差异性分布一致。表层沉积物具有“远岸细、近岸粗”的特点，与沙波远岸尺度小、近岸尺度大的分布规律有较好的对应关系。此外，研究区出现有近对称形态的沙波，可能为海平面变化期间多期潮流共同作用形成的残余沙波。
Abstract:To access the main factors influencing development and distribution of sand waves, analyses have been undertaken on the characteristics of sediment, hydrodynamics and sea level changes using the latest high-resolution multibeam, surface sediment and hydrodynamic data collected in the southeast of Beibu Gulf, where sand waves are abundantly developed. Results suggest that sand waves in this area are widespread, mostly developed on the sand ridges and in the troughs between sand ridges. Sand waves are smaller in scale in the offshore area but larger in the area nearshore. The development and distribution features of sand waves depend upon modern hydrodynamics and sediment supply. Geometric features and dimension of sand waves depend upon tidal inlet and flow velocity. Surface sediments are usually "finer offshore and coarser nearshore", corresponding to the distribution of sand waves referred above. Besides, some of the symmetrical sand waves are found in certain areas with residual properties, perhaps as the result of different hydrodynamics while sea level changes in different periods.
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Key words:
- sand waves /
- distribution characteristics /
- control factors /
- Beibu Gulf
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表 1 D、E、F区沙波和沉积物基本参数
Table 1. The basic parameters of sand waves and sediments in district D、E、F
区域 D E F 平均波高/m 1.8 2.63 3.79 平均波长/m 54 80.27 112.9 平均水深/m 31 19 17 平均粒径/mm 0.2 0.511 0.693 
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