两股红树林内河水流的汇合及其对沿海环境中沉积物迁移和沉积的影响

IF 2.1 3区 地球科学 Q2 OCEANOGRAPHY
Hemanth Vundavilli , Julia C. Mullarney , Iain T. MacDonald
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引用次数: 0

摘要

我们利用 Delft3D 进行了理想化数值试验,以研究凝聚浮力河流羽流与红树林植被的相互作用如何影响沿岸带的沉积物输运和沉积。我们的模型系统以新西兰北岛的泰晤士河为蓝本,设计为两条红树林衬砌的河流汇入一个沿岸海湾。通过量化一个潮汐周期内的沉积物通量,评估了进入三个相邻红树林区域(中部、西部和东部)的沉积物迁移模式。浮力河流羽流之间的相互作用形成了一个凝聚的河流羽流,沿着河流之间的红树林中部流动。进入红树林的总沉积物迁移量的主要贡献者随两条河流的总流量和相对流量而变化。当两条河流各自的流量被强制设定为观测流量的第 50 百分位数时,对中央森林沿线沉积物迁移通量的分析表明,河口两侧红树林内的沉积物沉积量比中央森林沿线中间区域的沉积物沉积量高出近四倍;这与泰晤士河湾的卫星图像一致。5 米/秒-1 的风速会使河流羽流向风的方向偏转,从而改变整个沉积物迁移模式。在东风情况下,由于科里奥利偏转和风向与较大羽流的沿岸流向一致,沿岸迁移得到加强,因此沉积物流量最大(与无风情况相比接近 80%)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The coalescence of two mangrove-lined river plumes and consequences for sediment transport and deposition in a coastal environment

We employed idealized numerical experiments using Delft3D to investigate how the interactions of coalescing buoyant river plumes with mangrove vegetation affect sediment transport and deposition in the coastal zone. Our model system, based on the Firth of Thames in the North Island of New Zealand, is designed to represent two mangrove-lined rivers debouching into a coastal bay. Sediment transport patterns into the three adjacent mangrove forest regions (central, western, and eastern) were assessed by quantifying the sediment fluxes over a tidal cycle. The interactions between the buoyant river plumes resulted in a coalesced river plume that flowed along the central mangrove forest between the rivers. The dominant contributors to the total sediment transport into the mangrove forests varied with both the total and the relative flows through the two rivers. When both rivers were forced with their respective flows at the 50th percentile of observed flow, the analysis of sediment transport fluxes along the central forest revealed sediment deposition inside the mangrove forests lining the river mouth nearly four times greater than in the intermediate regions along the central forest; consistent with satellite imagery of the Firth of Thames. Winds of 5 m s−1 modify the overall sediment transport patterns by deflecting the river plume in the direction of the wind. The magnitude of sediment flux is the highest (nearly 80% compared to the no-wind scenario) in the case of an easterly wind scenario as the alongshore transport is enhanced by Coriolis deflection and wind direction aligned with the alongshore flows of the larger plume.

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来源期刊
Continental Shelf Research
Continental Shelf Research 地学-海洋学
CiteScore
4.30
自引率
4.30%
发文量
136
审稿时长
6.1 months
期刊介绍: Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.
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