Factors influencing subaqueous dunes in the Scheldt Estuary
Factors influencing subaqueous dunes in the Scheldt Estuary
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DOI：
10.1007/s00367-003-0154-x
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发表时间：
2004-02
影响因子：
2.1
通讯作者：
F. Francken;S. Wartel;Reg Parker;E. Taverniers
中科院分区：
文献类型：
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作者：
F. Francken;S. Wartel;Reg Parker;E. Taverniers
研究了安特卫普与比利时-荷兰边界之间的Scheldt河水下沙丘的大小(波长和高度)及其影响因素。分析了60多个沙丘集群(每个集群由平均高度和波长表示，大多是10到20个或更多的观测值)。沙丘高度与波长之间有很好的指数相关关系(r=0.90)，可用Hean=0.0321 L0.918来描述。长度/深度比在0.2到9之间变化，高度/深度比在0.25到0.01之间变化。水流速度与沙丘大小之间没有明显的关系，不同大小的沙丘在相同的流速下共存。对22个沙丘进行了采样，显示出粒度(D50)在0.1到0.7 mm之间。在8个大型沙丘中，有7个分布在沙质和/或硬底(砾石、粗砂和贝壳碎屑)环境中，而小型和中型沙丘分布在泥沙和砂泥环境中。
The size (wavelength and height) and the factors influencing the characteristics of subaqueous dunes in the river Scheldt between Antwerp and the Belgian-Dutch border were studied. More than 60 dune clusters (each cluster represented by a mean height and wavelength of mostly 10 to 20 or more observations) were analysed. A very good exponential correlation between dune height and wavelength was observed (r=0.90) which can be described byHmean=0.0321L0.918. Length/depth ratios vary between 0.2 and 9, height/depth ratios between 0.25 and 0.01. There was no clear relationship between current velocity and dune size, as dunes of various sizes co-exist at the same current velocities. Twenty-two dunes were sampled and show grain sizes (d50) ranging between 0.1 and 0.7 mm. Seven out of eight large scale dune fields were found in sandy and/or hard bottom (gravel, coarse sand and shell fragments) environments, whereas small and medium dunes were found in muddy sand and sandy mud environments.