Abstract We reviewed historical data on surface sediment composition/distribution and hydrodynamics of the Patos-Mirim lagoonal system, the largest coastal shallow limnological system of the world, located in eastern South America, which is ca.15,000 km2, the maximum length is almost 500 km and maximum depth is around 7 m. We inferred the geographical position of six mud depocenters in relation to the hydrodynamic conditions evolved from predominant winds and morphometry. Littoral zones of sediment resuspension dominated by sand were identified where current velocity was higher than 0.2 m s−1 and depth was 5 m. Such conditions observed for the central zones represent appropriate morphodynamic controls for mud depocenter formation. The six permanent Holocene depocenters for the whole Patos-Mirim system were all dominated mostly by silty clayey facies and exhibited an Mz value equal to or higher than 7.5. Because of the dominance of the fine fraction, we propose them as future potential key-spots for monitoring the environmental quality of the system to assist regional sustainable management.

中文翻译：

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审查大型浅海岸泻湖的沉积学和水动力数据，以将泥浆沉积中心定义为环境监测站点

摘要 我们回顾了位于南美洲东部约 15,000 平方公里，最大长度近 500 平方公里的世界上最大的沿海浅层湖沼系统——帕托斯-米里姆泻湖系统的表层沉积物组成/分布和流体动力学的历史数据。 km，最大深度约为 7 m。我们推断了六个泥浆沉积中心的地理位置与由主导风和形态测量演变而来的水动力条件有关。确定了以砂为主的沉积物再悬浮沿岸带，其中流速高于 0.2 m s-1，深度为 5 m。在中央区域观察到的这种条件代表了对泥浆沉积中心形成的适当形态动力学控制。整个Patos-Mirim系统的6个永久全新世沉积中心均以粉砂质粘土相为主，Mz值等于或高于7.5。由于精细部分的优势，我们建议将它们作为未来监测系统环境质量以协助区域可持续管理的潜在重点。