A study of sediment transport in a shallow estuary using MODIS imagery and particle tracking simulation
A study of sediment transport in a shallow estuary using MODIS imagery and particle tracking simulation
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DOI：
10.1080/01431161.2010.512938
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发表时间：
2011-10
影响因子：
3.4
通讯作者：
Haihong Zhao;Q. Chen;N. Walker;Q. Zheng;Hugh L. MacIntyre
中科院分区：
文献类型：
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作者：
Haihong Zhao;Q. Chen;N. Walker;Q. Zheng;Hugh L. MacIntyre
利用空间分辨率为250 m的中分辨率成像光谱仪（MODIS）红通道反射率，估计悬浮泥沙浓度（SSC）在移动的湾河口，亚拉巴马。基于每月现场采样，采用指数回归模型提出了一种新的算法。应用该算法对移动的海湾和密西西比海峡的无机悬浮泥沙浓度进行了研究和制图。冷锋通过期间的国际空间站地图揭示了沉积物的再悬浮和运输如何对这种微潮汐系统中的可变风强迫作出反应。利用基于三维流体动力学模型的粒子跟踪来解释从卫星图像中观察到的情况。结果表明，冷锋过境后ISS的快速消失主要是由于沉积物沉降而不是被冲出河口所致。该研究表明，结合国际空间站映射的中分辨率成像分光仪波段1反射率和三维数值模拟是一个有效的工具，分析沉积动力学在移动的湾河口和其他类似的河口。
The study utilized the Moderate Resolution Imaging Spectroradiometer (MODIS) red-channel reflectance with a spatial resolution of 250 m to estimate suspended sediment concentration (SSC) in the Mobile Bay estuary, Alabama. Based on monthly in situ sampling, a new algorithm was developed using an exponential regression model. The concentration of inorganic suspended sediments (ISS) in Mobile Bay and Mississippi Sound was concerned and mapped by applying the new algorithm. The ISS maps during a cold front passage have revealed how the resuspension and transport of sediments respond to the variable wind forcing in this micro-tidal system. Particle tracking based on a three-dimensional hydrodynamic model was utilized to explain what was observed from the satellite imagery. It has been found that the rapid disappearance of the surface ISS after a cold front passage was mainly caused by settling of sediments rather than flushing out of the estuary. The study demonstrates that a combination of ISS mapped from the MODIS band-1 reflectance and three-dimensional numerical modelling is an effective tool to analyse sediment dynamics in the Mobile Bay estuary and other similar estuaries.