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Modelling the transport of sediment discharged by Colombian rivers to the southern Caribbean Sea

机译：建模哥伦比亚河流排放到加勒比海南部的沉积物运输

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The three-dimensional transport of sediments released by the main rivers in the Colombian Caribbean basin is investigated using numerical model simulations. Different types of sediments (fine sands, very fine sands and coarse silts) were tracked by implementing SedimentDrift software, a subclass of the OpenDrift open-source trajectory framework. The simulations were forced with climatological winds from ERA-5 and currents from the Copernicus Marine Environment Monitoring Service (CMEMS). In situ measurements from the area were utilised in the evaluation of the forcing fields. The diagnostic analysis of ERA-5 and CMEMS at the evaluated stations in the Colombian basin led to the conclusion that these datasets are reliable; hence, they can be used for several oceanographic and coastal engineering studies. The sediment transport of non-cohesive particles at each river mouth is subject to the variability of local hydrodynamics, morphological features and the grain size, which determines the settling velocities. These factors were considered and evaluated in detail. Given the lack of available in situ information, the performance of the Lagrangian model is evaluated by comparing the resulting simulations with previous studies reported in the area for river plume dynamics. However, this study presents an initial analysis of the pathways that sediments of different sizes follow, from the river mouth to the seafloor. This approach is convenient given that the Colombian rivers deliver large amounts of sediment of various grain sizes, there are insufficient in situ data to assess the seasonal cycle of sediment transport and many aspects of the sediment dynamics are not fully resolved. The resulting simulations provide evidence of the importance of high-resolution ocean current data, given that this is the main factor determining the trajectories and dispersion patterns at seasonal scales.
机译：使用数值模拟模拟研究了哥伦比亚加勒比盆地主要河流释放的沉积物的三维运输。通过实施沉淀件软件，通过实施沉淀型软件，Opendrift开源轨迹框架的子类跟踪不同类型的沉积物（细砂，非常细的沙子和粗液）。从ERA-5的气候风中迫使模拟和来自Copernicus Marine环境监测服务（CMEMS）的电流。从该区域的原位测量用于评估迫使领域。 ERA-5和CMEM在哥伦比亚盆地评估站的诊断分析导致了这些数据集可靠的结论;因此，它们可用于多个海洋和沿​​海工程研究。在每个河口处的非粘性颗粒的沉积物传输受到局部流体动力学，形态特征和晶粒尺寸的可变性，这决定了沉降速度。详细考虑和评估这些因素。鉴于缺乏现场信息，通过将结果模拟与以前的研究中报告的河流羽流动力学的区域进行比较来评估拉格朗日模型的性能。然而，本研究提出了对不同尺寸的沉积物，从河口到海底的途径初步分析。这种方法很方便，鉴于哥伦比亚河流提供大量粒度的沉积物，原位数据不足以评估沉积物运输的季节性循环，并且沉积物动力学的许多方面都没有完全解决。结果模拟提供了高分辨率海洋当前数据的重要性，因为这是确定季节性尺度的轨迹和分散模式的主要因素。

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