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首页> 外文期刊>Journal of great lakes research >Estimation of the width of the nearshore zone in Lake Michigan using eleven years of MODIS satellite imagery
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Estimation of the width of the nearshore zone in Lake Michigan using eleven years of MODIS satellite imagery

机译：利用MODIS卫星图像十一年估算密歇根湖近岸带的宽度

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The nearshore zone, that region of water directly influenced by its proximity to the coast, has received increasing attention in recent years. The extent of the nearshore zone has been defined by some constant descriptive feature: e.g., a specific depth or a particular distance offshore. This type of definition does not allow for the dynamic nature of the relationship between the land and water and how it may be influenced by local, seasonal, or transient effects. Here satellite observations examined evaluate how the width of the nearshore zone in Lake Michigan varies with position along the coastline and with time. Satellite-derived estimates of chlorophyll concentration along seventy-one shore-normal transects spaced approximately 10 km apart around the lake were used to determine the width of the nearshore zone, defined as the point at which the estimated chlorophyll concentration close to the shore approaches the more-uniform offshore concentration. Of a total of 23,807 transects extracted from MODIS observations made between 2003 and 2013, we successfully fit a bi-linear model relating chlorophyll concentration to distance offshore to 15,996. We found that the width of the nearshore zone is variable, both seasonally and spatially. Although the overall median width of 45 km (mean width 53 km) closely corresponds to the 5 km value used in a number of Great Lakes studies including Lake Michigan, 10% of the estimates are 8.9 km, likely representing times of enhanced mixing and transport of nearshore waters into the offshore. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
机译：近年来，近岸地区是受其靠近海岸直接影响的水域。近岸区域的范围已由一些恒定的描述性特征定义：例如，特定深度或海上特定距离。这种定义不允许土地和水之间的关系具有动态性质，也不能受到当地，季节性或暂时性影响的影响。在这里检查的卫星观测结果评估了密歇根湖近岸带的宽度如何随海岸线位置和时间而变化。利用卫星得出的沿湖周围约10 km的71个海岸正常样点的叶绿素浓度估算值，用于确定近岸区域的宽度，该宽度定义为靠近海岸的估算叶绿素浓度接近水面的点。离岸集中度更高。在2003年至2013年间从MODIS观测中提取的总共23,807个样点中，我们成功地拟合了一个双线性模型，该模型将叶绿素浓度与离岸到15,996的距离相关。我们发现，近岸带的宽度在季节和空间上都是可变的。尽管45 km的总中值宽度（平均宽度53 km）与包括密歇根湖在内的许多大湖区研究中使用的5 km值非常接近，但10％的估计值大于8.9 km，这可能代表了混合和增强混合的时间。近岸水域到近海的运输。由Elsevier B.V.代表国际大湖研究协会出版。

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