Abstract
Abstract. This research was applied high-resolution Sentinel-2A imagery which aims to monitor a suitability of MultiSpectral Imager (MSI) at higher resolution (10 m) for mapping of Total Suspended Solids (TSS) ) in the upper reaches of the Mekong Delta – An Giang province. The field survey is carried out to collect TSS at random distribution sites outside full-dyke protection. A remote sensing algorithm with a regression function method is developed to estimate TSS concentration automatically to select between the most sensitive TSS and water reflectance relationship. The regression analytical algorithm is predicted the output values based on normalized suspended material index (NSMI) (r2 = 0.92), showing the MSI sensor’s great potential to estimate TSS. The results confirm that suspended materials in the surface water reached the minimum of 10.36 mg/l and the maximum of 328.56 mg/l in An Giang province, the suspended materials distributional tendency with high content was mainly in flooded fields near the upstream of the basin of Hau river, especially in areas without the dike enclosure and the content was low in the areas within the dike enclosure. These findings promote further research in water quality studies relying on both operational Sentinel-2A and Sentinel-2B imageries with great implications to improve the understanding of turbid coastal and inland water environments.
Highlights
Suspended sediment is an important factor in determining the quality of water (Xue Z, 2011) such as water clarity, reservoir storage and sediment serves as a vehicle for the transport of many binding contaminates, including nutrients, trace metals, semi-volatile organic compounds, and numerous pesticides (EPA, 2000)
This study focused on established and analyzed Sentinel-2A multispectral imagery to retrieve suspended sediment concentration in the Hau River, Vietnam
The obtained results in this study indicate that water in Hau River is suitable for irrigation purposes or similar water quality purposes with low quality water requirements
Summary
Suspended sediment is an important factor in determining the quality of water (Xue Z,, 2011) such as water clarity, reservoir storage and sediment serves as a vehicle for the transport of many binding contaminates, including nutrients, trace metals, semi-volatile organic compounds, and numerous pesticides (EPA, 2000). The monitoring of suspended sediment components is critical to implement the effect of the environmental management (Duan W., 2013). The spatial and temporal heterogeneity of water bodied layers combined the conventional sampling methods leading to an inadequate monitoring and characterization of water quality (Liu Y., 2003). The application of remote sensing to assess inland water quality has been recognized recently because its capability of scanning wide water bodies within a short time period (2003). A combined approach of the spatial and temporal remote sensing with conventional water sampling presents a potentially effective solution to monitor freshwater environment (Yang W., 2011). The successful application of remote sensing technology to suspended sediment load monitoring of rivers could be a very useful tool for management and development at basin scales (Julian JP., 2008)
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