Journal of Dalian Ocean University  2024, Vol. 39 Issue (1): 134-143 DOI: 10.16535/j.cnki.dlhyxb.2023-133 |
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| Numerical simulation of concentration distribution characteristics of ecological indicators in Liaodong Bay based on Delft3D model |
| ZHAO Ziyu，ZHU Xiaosen，WANG Zhuo，ZHANG Mingliang*
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1.College of Marine Science and Environment，Dalian Ocean University，Dalian116023，China；2.Technology Innovation Center for Coastal Ecological Environment and Disaster Protection，Dalian116023，China
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Abstract In order to explore the temporal and spatial distribution characteristics and interaction mechanism of chlorophyll a and nutrients in the Liaodong Bay, an ecological dynamic model is established including ecological indicators such as chlorophyll a (Chl-a), dissolved oxygen (DO), ammonia nitrogen  based on the numerical simulation method (Delft3D model), in Liaodong Bay based on Delft3D model. The accuracy of the model was verified, and then the spatial-temporal changes and distribution of ecological indicator concentrations including Chl-a in the Liaodong Bay waters were analyzed. The results showed that there were obvious spatial and temporal distribution characteristics of the ecological index concentrations in the Liaodong Bay. A trend of autumn (4.83 μg/L) >summer (4.13 μg/L) >spring (3.39 μg/L) in the concentration of Chl-a was observed, spring (9.41 mg/L) >summer (7.26 mg/L) >autumn (5.84 mg/L) in concentration of  was found, spring (0.76 mg/L) >autumn (0.56 mg/L) >summer (0.50 mg/L) in concentration of DO was occurred, spring (0.039 mg/L) >autumn (0.030 mg/L) >summer (0.026 mg/L) in the concentration of  was found and autumn (0.025 mg/L) >summer (0.020 mg/L) >spring (0.018 mg/L) in concentration of  was observed. In terms of spatial distribution, the high concentration distribution of Chl-a, (spring and summer) and (spring and summer) was found in the northeast Liaodong Bay and low in the southwest Liaodong Bay, and the concentration of was high at the bayhead and baymouth and low in the middle. It was found that the important factors affecting the temporal and spatial distribution of ecological index concentrations were of Liao River and Daliao River at the upper basin of Liaodong Bay, with the relative limitation of phosphorus as nutrient limitation in the Liaodong Bay.
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Published: 13 March 2024
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