浅水风生波作用下再悬浮沉积物中磷释放的研究

程鹏达; 朱心广; 安翼; 冯春

doi:10.1007/s10409-021-09023-z

Research on phosphorus release from resuspended sediment under wind-induced waves in shallow water

doi: 10.1007/s10409-021-09023-z

Cheng Pengda¹,
Zhu Xinguang^{1, 2},
An Yi¹,
Feng Chun^{1,*
, ,}

1.
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
2.
School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

the Strategic Priority Research Program of the National Key R&D Program of China Grant

and the National Natural Science Foundation of China NSFC

More Information

Corresponding author: Feng Chun, E-mail address: fengchun@imech.ac.cn (Chun Feng)

摘要

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.
- Phosphorus /
- Wind-induced waves /
- Sediment resuspension /
- Sediment-water interface /
- Desorption

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1. Relationship between wind speed and wave parameters.

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2. Computational domain for simulation.

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3. Comparison of the numerical simulation results and experimental results.

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4. Pressure distribution for different wave periods.

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5. Peak pressure with wind velocity at different time.

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6. Vertical distributions of average volume fraction (φ) of particles in the overlying water at different time.

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7. Vertical distribution of φ in overlying water at 100T.

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8. Relationship between the average total P concentration and time.

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9. Relationship between the amount of P released per unit of sediment (c/φ) and time.

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10. Comparison of the initial and final values of c/φ.

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Table 1. Calculation parameters for model validation

h (m) H (m) T (s) L (m) D₅₀ (μm)

Experiment 1 [32] 0.3 0.14 1.7 2.71 130
Experiment 2 [32] 0.3 0.09 1.7 2.71 97
Experiment 3 [32] 11.3 2.0 8 72.43 80

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Table 2. Calculation parameters for wind-induced waves

U_{z = 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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Research on phosphorus release from resuspended sediment under wind-induced waves in shallow water

doi: 10.1007/s10409-021-09023-z

Corresponding author: Feng Chun, E-mail address: fengchun@imech.ac.cn (Chun Feng)

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目录

	h (m)	H (m)	T (s)	L (m)	D₅₀ (μm)
Experiment 1 [32]	0.3	0.14	1.7	2.71	130
Experiment 2 [32]	0.3	0.09	1.7	2.71	97
Experiment 3 [32]	11.3	2.0	8	72.43	80

	U_{z = 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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Research on phosphorus release from resuspended sediment under wind-induced waves in shallow water

doi: 10.1007/s10409-021-09023-z

Corresponding author: Feng Chun, E-mail address: fengchun@imech.ac.cn (Chun Feng)

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