| GAO Zengwen,ZHENG Xilai,XU Qinxuan. 2008. Resistance of the diffusive boundary layer to salt release from saline sediments to freshwater. Acta Oceanologica Sinica, (1):23－28 |
| Resistance of the diffusive boundary layer to salt release from saline sediments to freshwater |
| Resistance of the diffusive boundary layer to salt release from saline sediments to freshwater |
| Received:October 29, 2006 Revised:February 10, 2007 |
| DOI： |
| Key words:sediment-water interface diffusive boundary layer molecular diffusion salt transport resistance effect |
| 中文关键词: sediment-water interface diffusive boundary layer molecular diffusion salt transport resistance effect |
| 基金项目:The National Science Foundation of China under contract No.40572142;the Doctoral Foundation of the Ministry of Education of China under contract No.20040423016. |
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| Abstract: |
| The diffusive boundary layer (DBL) is the zone for matter exchange between surface water and aquatic sediments. To elucidate the influence of DBL on salt release from saline sediments to freshwater, two experiments with or without wind blowing were conducted. According to the experiments, a 3.5 cm DBL is formed above the smoothed sediments at a steady wind field and this thickness is greater than other studies. The observed flux of salt through the DBL is 6% larger than the calculated value from Fick's first law. The results indicate that molecular diffusion is the dominant mechanism for salt transport through the DBL. The presence of DBL suppresses the hydrodynamic enhancement for matter exchange between sediments and overlying water. Therefore, salts in the sediments of a polder reservoir may influence the water quality chronically. |
| 中文摘要: |
| The diffusive boundary layer (DBL) is the zone for matter exchange between surface water and aquatic sediments. To elucidate the influence of DBL on salt release from saline sediments to freshwater, two experiments with or without wind blowing were conducted. According to the experiments, a 3.5 cm DBL is formed above the smoothed sediments at a steady wind field and this thickness is greater than other studies. The observed flux of salt through the DBL is 6% larger than the calculated value from Fick's first law. The results indicate that molecular diffusion is the dominant mechanism for salt transport through the DBL. The presence of DBL suppresses the hydrodynamic enhancement for matter exchange between sediments and overlying water. Therefore, salts in the sediments of a polder reservoir may influence the water quality chronically. |
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