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首页> 外文期刊>Scientific reports. >Modelling Holocene analogues of coastal plain estuaries reveals the magnitude of sea-level threat
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Modelling Holocene analogues of coastal plain estuaries reveals the magnitude of sea-level threat

机译：沿海平原河口的全新世模式建模揭示了海拔威胁的大小

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Hydrodynamic modelling of Australia’s lower Murray River demonstrates the response of a large coastal plain estuary to the mid-Holocene (7,000–6,000?yr BP) sea-level highstand. The approximately two metre higher-than-present sea level during the highstand forced the estuarine limit upstream generating an extensive central basin environment extending more than 200 kilometres from the river mouth (143 kilometres upstream of the modern tidal limit). The geomorphic history of the region does not conform to conventional estuarine facies models as, for much of the Holocene, the lower Murray River acted as a landward, gorge-confined extension of the Murray estuary. The incredibly low relief of this coastal plain system drove significant saline incursion and limited current velocities across the estuary facilitating deposition of a laminated silt-clay sequence which our results suggest may be regionally extensive. Variations to discharge, barrier morphology, or the estuary’s bathymetry result in minimal change to the estuarine palaeo-environment. The shift to the present-day fresher water distribution in the Murray estuary requires a fall in sea level to present-day conditions. The dominance of sea level as the controlling factor on this estuarine palaeo-environment highlights the significant potential impact of climate change induced sea-level rise to coastal plain estuaries.
机译：澳大利亚较低的默里河的流体动力学型号展示了大型沿海普通浅滩到中东地区（7,000-6,000？YR BP）海平面高层的反应。高于高于现有的海拔大约两米的海平面，迫使河口河口的广泛的中央盆地环境从河口延伸超过200公里（现代潮汐极限的上游143公里）。该地区的地貌历史并不符合传统的河滨相模型，因为对于大部分全新世，下默里河占据着陆地峡谷的陆地峡谷延伸。这种沿海平原系统的令人难以置信的低浮雕在浅析探讨了我们的结果所表明的沉积可能是区域广泛的探讨，促进了盐水侵入和限制探测器。放电，屏障形态或河口的沐浴物质的变化导致河口古群环境的最小变化。在默里河口的当今新鲜水分布的转变需要落入海平面至当今的条件。海平面的主导地位为斯瓦里兰·普拉诺 - 环境的控制因素突出了气候变化引起的海平面升起对沿海平原河口的显着潜在影响。

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