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Impact of Coastal Infrastructure on Ocean Colour Remote Sensing: A Case Study in Jiaozhou Bay, China

1
School of Science, The University of New South Wales, Canberra ACT 2600, Australia
2
The Sino-Australian Research Centre for Coastal Management, The University of New South Wales, Canberra ACT 2600, Australia
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(8), 946; https://doi.org/10.3390/rs11080946
Received: 15 March 2019 / Revised: 4 April 2019 / Accepted: 8 April 2019 / Published: 19 April 2019
(This article belongs to the Special Issue Remote Sensing of Estuarine, Lagoon and Delta Environments)
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Abstract

Spatial and temporal ocean colour data are increasingly accessible through remote sensing, which is a key tool for evaluating coastal biogeochemical and physical processes, and for monitoring water quality. Coastal infrastructure such as cross-sea bridges may impact ocean colour remote sensing due to the different spectral characteristics of asphalt and the seawater surface. However, this potential impact is typically ignored during data post-processing. In this study, we use Jiaozhou Bay (East China) and its cross-bay bridge to examine the impact of coastal infrastructure on water-quality remote-sensing products, in particular on chlorophyll-a concentration and total suspended sediment. The values of these products in the bridge area were significantly different to those in the adjacent water. Analysis of the remote-sensing reflectance and application of the Normalised Difference Water Index demonstrate that this phenomenon is caused by contamination of the signal by bridge pixels. The Moderate Resolution Imaging Spectroradiometer (MODIS) products helped estimate the pixel scale that could be influenced by contamination. Furthermore, we found similar pixel contamination at Hangzhou Bay Bridge, suggesting that the impact of large coastal infrastructure on ocean colour data is common, and must therefore be considered in data post-processing. View Full-Text
Keywords: coastal infrastructure; remote sensing; data quality; Jiaozhou Bay; GOCI; chlorophyll-a; total suspended sediment coastal infrastructure; remote sensing; data quality; Jiaozhou Bay; GOCI; chlorophyll-a; total suspended sediment
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Yuan, Y.; Jalón-Rojas, I.; Wang, X.H. Impact of Coastal Infrastructure on Ocean Colour Remote Sensing: A Case Study in Jiaozhou Bay, China. Remote Sens. 2019, 11, 946.

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