Field observations on the characteristics of sand ripples on tidal flats

IF 2.7 2区 地球科学 Q1 GEOLOGY Sedimentary Geology Pub Date : 2024-07-06 DOI:10.1016/j.sedgeo.2024.106714
Chuang Jin , Zheng Gong , Ran Ge , Xindi Chen
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Abstract

Ripples on tidal flats significantly influence bedform roughness and near-bed turbulence, yet their dynamics in sandy and muddy environments remain incompletely understood. While laboratory studies have elucidated the effects of mud content and extracellular polymeric substances (EPSs) on ripple formation and stability, the interactions between ripple characteristics, EPS, and mud content in natural settings are more complex and not thoroughly explored. To address this gap, we conducted field studies on sand ripples at the central Jiangsu coast, China, using high-resolution drone photogrammetry to accurately measure ripple dimensions. We performed bedload sampling at both ripple crests and troughs to analyze median grain size, mud content, and EPS concentrations. Our results show that the investigated ripple wavelengths range from 34 to 46 mm, and heights vary between 2.7 and 5.3 mm. Ripples developed near tidal creeks show pronounced asymmetry. Significantly, EPS concentrations are markedly higher at the ripple crests than at the troughs, and it follows a power-law relationship with the median grain size. These results highlight the complex intricate relationship between the ripple morphology, environmental forcing conditions, and EPS content. Our findings enrich the understanding of ripple development and the factors influencing current-dominated ripples in natural environments. This research also adds to the better prediction of the bedform roughness and quantification of the near bed sediment transport.

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实地观察滩涂沙纹的特征
滩涂上的波纹对床面粗糙度和近床湍流有很大影响,但人们对波纹在沙质和泥质环境中的动态仍不甚了解。虽然实验室研究已经阐明了泥浆含量和细胞外高分子物质(EPS)对波纹形成和稳定性的影响,但自然环境中波纹特征、EPS 和泥浆含量之间的相互作用更为复杂,尚未得到深入探讨。为了弥补这一空白,我们在中国江苏中部沿海地区对沙质波纹进行了实地研究,利用高分辨率无人机摄影测量技术精确测量了波纹的尺寸。我们在波纹波峰和波谷进行了床面负荷取样,分析了中值粒径、含泥量和 EPS 浓度。结果表明,所调查的波纹波长在 34 至 46 毫米之间,高度在 2.7 至 5.3 毫米之间。在潮汐溪流附近形成的波纹具有明显的不对称性。值得注意的是,波纹波峰处的 EPS 浓度明显高于波纹波谷处,且与中值粒径呈幂律关系。这些结果凸显了波纹形态、环境胁迫条件和 EPS 含量之间错综复杂的关系。我们的研究结果丰富了人们对波纹发展以及自然环境中以海流为主的波纹的影响因素的认识。这项研究还有助于更好地预测床形粗糙度和量化近床沉积物运移。
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来源期刊
Sedimentary Geology
Sedimentary Geology 地学-地质学
CiteScore
5.10
自引率
7.10%
发文量
133
审稿时长
32 days
期刊介绍: Sedimentary Geology is a journal that rapidly publishes high quality, original research and review papers that cover all aspects of sediments and sedimentary rocks at all spatial and temporal scales. Submitted papers must make a significant contribution to the field of study and must place the research in a broad context, so that it is of interest to the diverse, international readership of the journal. Papers that are largely descriptive in nature, of limited scope or local geographical significance, or based on limited data will not be considered for publication.
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