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Outline
In recent years, frequent coastal water environmental issues have been caused by economic and population development. In this study, water quality sampling was conducted in the Guan River, Huai River, and their adjacent coastal areas from October 30 to November 1, 2022, and from June 12 to June 14, 2023. The eutrophication status of the water bodies in the region was evaluated using the organic pollution index, nitrogen-to-phosphorus ratio, and eutrophication index method. Based on the Delft3D model, a three-dimensional hydrodynamic water quality model was established for the coastal areas of the Guan River and Huai River in northern Jiangsu Province. The transport and transformation processes of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), chlorophyll-a (Chl-a), total nitrogen (TN), and total phosphorus (TP) were simulated. Six different discharge scenarios were designed, including varying the pollutant discharge volume from the rivers (reduced by 20%, reduced by 50%, and increased by 30%) and different discharge timings (normal discharge and discharge during ebb tide when estuary gates were opened). The results showed that the water quality concentration distribution in the coastal areas of the Guan River and Huai River exhibited significant temporal and spatial characteristics. The average concentrations of COD, NH3-N, Chl-a, and TN were higher in summer than in winter. Spatially, the average COD concentration in the Guan River channel was lower than that in the estuarine coastal area, while the average concentrations of NH3-N, Chl-a, TN, and TP gradually decreased along the Huai River channel toward the estuary. The overall water quality concentration in the study area displayed a fan-shaped diffusion trend from the river channels to the estuarine coastal zone. Future scenario simulations indicated that reducing the discharge volume by 50% and discharging pollutants during ebb tide when the gates were opened could most effectively reduce pollutant concentrations in the study area.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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