Study on eutrophication characteristics of rainy and dry season in Shenzhen Bay

Abstract

Abstract Firstly, the eutrophication of five monitoring points in Shenzhen Bay was analyzed by using the nutritional status quality index method, and the eutrophication of the entire Shenzhen Bay was analyzed by the results of the eutrophication model simulation. The results showed that the maximum of the nutritional status quality index(NQI) in the dry season was 22, the minimum was 3;the maximum NQI in the rainy season was 23, the minimum was 4, and when NQI is greater than 3, the water is eutrophication level, so whether it was the dry season or the rainy season, Shenzhen Bay is basically eutrophic, and the eutrophication of the Shenzhen Bay in the rainy season is more serious than that in the dry season. Regardless of the dry season or the rainy season, the NQI of the Shenzhen Bay outer area is basically around 5, while the NQI of the interior area is basically larger than that of the outer area. The degree of eutrophication is more serious than that of the outer area;the maximum NQI is 22 in the high tide during the dry season, and the maximum NQI is 23 in the rainy season;the maximum NQI is 21 in the ebb during the dry season, and the maximum NQI in the rainy season is 22, so the eutrophication of Shenzhen Bay is more serious than the ebb when the high tide.