Assessment of salinity intrusion in coastal districts of Ben Tre province using Landsat 8 image
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Abstract
Monitoring and evaluation of saline water intrusion is an important task, especially for agricultural production in Ben Tre province. The paper introduces a new solution in the application of Landsat 8 satellite imagery and field survey data to determine the soil electrical conductivity (EC) for soil salinity assessment through the distribu-tion of EC indice value. Analyzing and establishing the correlation between reflectance value, salinity indices and EC allow selecting a suitable model for the creation of a soil salinity map in 4 levels corresponding to EC values: no salinity (0 - 4), mild (4 - 8), moderate (8 - 16), very salinity (> 16). Research results in 2019 showed that most of the coastal districts of Ben Tre province were salty with EC values ranging from 8 to 16. The salinity decreased gradually from the East Sea to the mainland with the distance from 15 to 25 km. In brief, the study proposed solutions for rapid monitoring and evaluation of soil salinity based on the easy access of Landsat 8 images to calculate the necessary indices in the establishment of soil salinity maps for the local and regional scale.
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References
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