Modeling water quality impacts from hurricanes and extreme weather events in urban coastal systems using Sentinel-2 spectral data
Modeling water quality impacts from hurricanes and extreme weather events in urban coastal systems using Sentinel-2 spectral data
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DOI：
10.1007/s10661-020-08291-5
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发表时间：
2020-04
影响因子：
3
通讯作者：
R. Sobel;Amin Kiaghadi;H. Rifai
中科院分区：
文献类型：
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作者：
R. Sobel;Amin Kiaghadi;H. Rifai
由于危险的条件，在极端风暴期间和之后立即进行常规水质测量几乎是不可能的。在这项研究中，遥感反射率被用来建立一个回归方程，在飓风哈维之后几乎实时地量化总悬浮固体(TSS)。该应用特别侧重于泥沙负荷和沉积及其对休斯顿航道和加尔维斯顿湾河流-河口系统的潜在影响。欧洲航天局的哨兵2号卫星在风暴发展的关键点捕捉到了图像，因此有必要为这一相对较新的卫星任务开发新的算法。分析了几个线性回归，目的是建立一个简单的单或两个波段的方程，最终的模型使用红色和近红外波段(R2= 0.74)。结果显示，哈维期间创纪录的水流为墨西哥湾带来了前所未有的悬浮泥沙负荷，浓度超过125m g/L，整个海湾的平均浓度为43m g/L。研究结果表明，风暴过后，泥沙输送最多需要11天才能减弱。
Conventional water quality measurements are nearly impossible during and immediately after extreme storms due to dangerous conditions. In this study, remotely sensed reflectance is used to develop a regression equation that quantifies total suspended solids (TSS) in near real-time after Hurricane Harvey. The application focused specifically on sediment loading and deposition and its potential impacts on the Houston Ship Channel and Galveston Bay riverine-estuarine system. The European Space Agency’s Sentinel-2 satellite captured images at critical points in the storm’s progression, necessitating the development of a new algorithm for this relatively new satellite mission. Several linear regressions were analyzed with the goal of developing a simple one- or two-band equation, and the final model uses the red and near infrared bands (R2= 0.74). Results show that record flows during Harvey delivered unprecedented suspended sediment loads to the Gulf of Mexico at concentrations above 125 mg/L with a mean concentration of 43 mg/L across the bay. The study findings demonstrated that it took up to 11 days after the storm for sediment transport to abate.