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首页> 外文期刊>Estuarine Coastal and Shelf Science >Multi-temporal dynamics of suspended particulate matter in a macro- tidal river Plume (the Gironde) as observed by satellite data
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Multi-temporal dynamics of suspended particulate matter in a macro- tidal river Plume (the Gironde) as observed by satellite data

机译：卫星数据观测到的潮汐河Plume（吉伦特省）中悬浮颗粒物的多时间动态

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摘要

The Gironde River plume area is unique in terms of Suspended Particulate Matter (SPM) dynamics. Multiple factors contribute to the variations of SPM at multiple time scales, from river outputs to wind stress, currents and tidal cycles. The formation and evolution of the Maximum Turbidity Zone (MTZ) inside the estuary also plays a significant role. Thus, detailed analyses and monitoring of the region is important for better understanding the mechanisms governing the turbid plume dynamics, for proper future management and monitoring of SPM export from the estuary to the coastal ocean. In this study we use an unprecedented volume of satellite data to capture and better understand the dynamics of the river plume. We combine two types of satellite information in order to achieve these goals: data collected by the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Spinning Enhanced Visible and Infrared Imager (SEVIRI) sensors. The integrated information allows accounting for multiple time scales, i.e. from seasonal to diurnal cycles. We show and parameterize the overall effects of river discharge rates over the plume extension. Seasonal variations are also analyzed and an overall relationship between river discharge rates and plume magnitude is computed. For the first time, we clearly observe and explain the diurnal cycle of SPM dynamics in the river plume. Despite the limited capabilities of the SEVIRI sensor, geostationary data was successfully used to derive such information and results similar to in-situ datasets were obtained. The same patterns are observed, with significant increase in SPM plume during spring/ebb tide periods. Results from our study can be further used to refine sediment transport models and to gain a better perspective on the ecological implications of the sediment output in the continental shelf area. (C) 2018 Elsevier Ltd. All rights reserved.
机译：吉伦特河羽状流区域在悬浮颗粒物（SPM）动力学方面非常独特。从河流输出到风应力，水流和潮汐周期，多种因素会导致SPM在多个时间尺度上的变化。河口内最大浊度区（MTZ）的形成和演化也起着重要作用。因此，对该区域进行详细的分析和监测对于更好地了解控制浑浊羽流动力学的机制，对未来的适当管理和监测从河口到沿海海洋的SPM出口具有重要意义。在这项研究中，我们使用了前所未有的卫星数据量来捕获和更好地了解河羽的动态。为了实现这些目标，我们结合了两种类型的卫星信息：中分辨率成像光谱仪（MODIS）和旋转增强型可见光和红外成像仪（SEVIRI）传感器收集的数据。集成的信息允许考虑多个时间尺度，即从季节到昼夜周期。我们显示并参数化了羽流扩展过程中河水排放速率的总体影响。还分析了季节变化，并计算了河流流量与羽流量之间的总体关系。第一次，我们清楚地观察和解释了河羽中SPM动态的昼夜循环。尽管SEVIRI传感器的功能有限，但地球静止数据已成功用于导出此类信息，并且获得了与原位数据集相似的结果。观察到相同的模式，在春季/退潮期间SPM羽流显着增加。我们的研究结果可以进一步用于完善泥沙运移模型，并更好地了解大陆架地区泥沙输出的生态影响。 （C）2018 Elsevier Ltd.保留所有权利。

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