Dynamics of the turbidity plume in the Guadalquivir estuary (SW Spain): A remote sensing approach
Dynamics of the turbidity plume in the Guadalquivir estuary (SW Spain): A remote sensing approach
复制标题
瓜达尔基维尔河口（西班牙西南部）浊度羽流的动态：遥感方法
DOI：
10.1109/oceans-spain.2011.6003489
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
G. Navarro
中科院分区：
文献类型：
--
作者：
I. Caballero;J. Ruiz;G. Navarro
河口环境具有非常复杂和多变的形态动力学特征，是沉积物和污染物交换最关键的沿海地区之一。加的斯湾（伊比利亚半岛西南部）大陆架的施肥作用，其中瓜达尔基维尔河口和其他河流发挥着重要作用，是决定流域生产力的主要因素，也是邻近海岸沉积物的主要来源。这里介绍的工作是为了分析浊度羽流的空间和时间（季节到年度）变化与控制羽流的气象和海洋过程的关系。为了实现这一目标，我们处理了涵盖8年（2003-2010）期间的中分辨率成像光谱仪（MODIS）L2级图像。根据现场数据对传感器检索进行了验证，并显示出良好的相关性；这表明卫星天气观测作为该区域水质业务监测的有力工具的潜力。第一个初步结果证实，河口羽流的发展主要与雨季河流流量增加（负北大西洋涛动指数）有关，因此，这影响了叶绿素分布的季节性。通过此处描述的方法，已成功绘制了河口的浊度模式；建议将 MODIS 观测纳入该方法，因为这将提高对所研究现象的物理海洋学和海洋生物学方面的了解。这种方法具有广泛的沿海研究应用潜力。
Estuarine environments are characterized by very complex and varied morphodynamics and are one of the most critical coastal zones for the exchange of sediment and pollutants. The fertilization role of the continental shelf of the Gulf of Cadiz (SW Iberian Peninsula) in which the estuary of the Guadalquivir and other rivers play an influential role, is the major factor determining the productivity of the basin and is the main source of sediment for the adjacent coast. The work presented here was undertaken to analyze the spatial and temporal (seasonal-to-annual) variability of the turbidity plume in relation to the meteorological and oceanographic processes controlling the plume. To achieve this goal, we have processed Moderate Resolution Imaging Spectroradiometer (MODIS) level L2 images covering a period of 8 years (2003–2010). Validation of at-sensor retrieval against in situ data was performed and showed good correlation; this demonstrates the potential of satellite synoptic observations as a powerful tool for operational monitoring of water quality within the region. The first preliminary results confirm that the development of the estuarine plume is mostly associated with the increase in river discharge during the rainy seasons (negative North Atlantic Oscillation index), and this, therefore, affects the seasonality of chlorophyll distribution. By the approach described here, turbidity patterns in the estuary have been successfully mapped; the incorporation of MODIS observations in the approach is recommended, since this should improve knowledge of both the physical oceanography and the marine biology aspects of the phenomenon studied. This approach has potential application to a wide variety of coastal research.