An enhanced MODIS remote sensing model for detecting rainfall effects on sediment plume in the coastal waters of Apalachicola Bay.
An enhanced MODIS remote sensing model for detecting rainfall effects on sediment plume in the coastal waters of Apalachicola Bay.
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DOI：
10.1016/j.marenvres.2011.09.014
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发表时间：
2011-12
影响因子：
3.3
通讯作者：
Shuisen Chen;Wenrui Huang;Weiqi Chen;Xiuzhi Chen
中科院分区：
文献类型：
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作者：
Shuisen Chen;Wenrui Huang;Weiqi Chen;Xiuzhi Chen
绘制总悬浮固体（TSS）图是为了调查暴雨引起的阿巴拉契科拉湾沿岸水域沉积物羽流的特征。本研究提出了一种改进的 MODIS 遥感 TSS 二次多项式回归模型（校准：R2= 0.8586，N = 32；验证：RMSE 为 4.76 mg/l，N = 30）。 MODIS 暴雨事件前后的 TSS 绘图显示出 TSS 浓度明显的时空变化。在洋流驱动下，形成了宽度约40-50公里的风暴羽流，流向研究区西南部。在赛克斯切口附近发现了分隔高度浑浊的水（西侧）和相对清澈的水（东侧）的明显边界。此外，以局地暴雨造成的河流低流量条件下的TSS图作为背景TSS的参考，使用两个TSS阈值（分别为25和45mg/l）来估计暴雨羽流的范围和周围土地沉积物负荷的中心区域，以及当地暴雨期间沉积物羽流的空间范围和演变。此外，还发现Sites Cut东侧的TSS风暴羽流浓度迅速稀释到25 mg/L以下，形成了向东延伸、宽度约7-8公里的风暴羽流。本研究开发的方法可用于支持沿海雨水研究和管理活动。
Mapping of total suspended solids (TSS) was conducted to investigate rainstorm-induced characteristic of sediment plume in the coastal waters of Apalachicola Bay. An improved TSS quadratic polynomial regression model (Calibration: R2= 0.8586, N = 32; validation: RMSE of 4.76 mg/l, N = 30) for MODIS remote sensing was presented in this study. TSS mapping of MODIS before and after a rainstorm event showed distinct temporal–spatial variability of TSS concentration. Driven by ocean tidal current, a storm plume of width at about 40–50 km was formed flowing towards southwest of study area. The distinct boundary separating the highly turbid (west side) and relatively clear water (east side) was found near Sikes Cut. Further, by taking the TSS mapping under the low river discharge condition due to a local rainstorm as a reference of background TSS, two thresholds of TSS (25 and 45 mg/l respectively) were used to estimate the range of rainstorm plume and the central area of sediment load from surrounding land, and the spatial extent and evolution of the sediment plume during the local rainstorm. Besides, it was found that the storm plume concentration of TSS at east side of Sites Cut was quickly diluted under 25 mg/L, forming a storm plume towards east with width at about 7–8 km. The method developed in this study may be used to support coastal storm water research and management activities.