Research on phosphorus release from resuspended sediment under wind-induced waves in shallow water
doi: 10.1007/s10409-021-09023-z
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摘要: 沉积物-水界面是湖泊的重要界面, 与大多数环境和生态问题有关. 风生波引起沉积物再悬浮造成水体二次污染. 由于水、再悬浮沉积物和磷的耦合机制会影响界面附近磷的释放, 因此探索了两种不同吸附-解吸能力沉积物的耦合模型, 以检查沉积物再悬浮后磷的释放规律. 得到了风速、风生波特性、沉积物分布和水体含磷量之间的关系. 风生波影响沉积物-水界面附近的局部流场, 造成沉积物再悬浮. 对于不同的沉积物, 单位沉积物解吸释放量与风速呈负相关. 中低风速时, 沉积物因界面小范围流场变化再悬浮, 上覆水中的磷快速增加, 且难于扩散. 此时, 磷的释放表现出小范围集中释放的特点, 可能迅速影响水环境, 也可能为治理提供了窗口期.Abstract: Sediment-water interfaces are important interfaces for lakes, which are related to most environmental and ecological problems. Wind-induced waves cause secondary pollution via sediment resuspension. Since the coupling mechanism of water, resuspended sediments, and phosphorus affects the release of phosphorus (P) near the interface, a coupled model was explored for two sediment types with different adsorption-desorption capabilities to examine sediment resuspension and P release. The relationships among wind speed, wave characteristics, sediment distribution and P concentration were obtained. For different sediments, the unit sediment desorption release is negatively correlated with wind speed. When sediments are resuspended under low or moderate wind speed, the P concentration in the overlying water increases abruptly, hampering diffusion. P release exhibits the characteristics of concentrated release in a small region and changes the water environment rapidly.
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Key words:
- Phosphorus /
- Wind-induced waves /
- Sediment resuspension /
- Sediment-water interface /
- Desorption
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Table 1. Calculation parameters for model validation
Table 2. Calculation parameters for wind-induced waves
Uz = 0.1·(gh)−0.5 T (s) L (m) H (cm) H/L Case 1 2.92 0.35 0.19 0.73 0.039 Case 2 5.36 0.49 0.38 1.66 0.044 Case 3 7.80 0.61 0.57 2.59 0.045 Case 4 10.24 0.73 0.76 3.51 0.046 -
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