Quantifying the Effects of Submerged Aquatic Vegetation on Internal Loading in Lake: A Modelling Study of the Largest Shallow Lake in North China
SSRN, ISSN: 1556-5068
2022
- 3Citations
- 200Usage
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Article Description
Shallow lakes are greatly influenced by submerged aquatic vegetation (SAV), which affects hydraulic and water quality during their entire life cycle. An integrated model was developed based on the Environmental Fluid Dynamics Code (EFDC), which considers the dynamic bottom roughness and sediment release flux related to SAV growth and decomposition. Model results of hydrodynamics, water quality, and sediment-P release in Baiyangdian Lake (BL) were analyzed with and without the SAV module. The results showed that SAV played a critical and alterable role in regulating the internal loading in lakes. During the period of exponential growth, SAV reduced the velocity and sediment-P release in Zaozhadian by 20.06% and 11.68%, respectively. During the period of senescence, SAV reduced the velocity by 19.32% and increased sediment-P release by 49.36%, which was mainly attributed to DO consumption during residue decomposition. To mitigate the adverse effects of SAV on internal loading, measures should be taken to control the growth of SAV and ensure timely salvage before decomposition.
Bibliographic Details
Elsevier BV
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