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首页> 外文期刊>Journal of hydro-environment research >Spatial variability of phosphorus adsorption in surface sediment at channel confluences: Field and laboratory experimental evidence
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Spatial variability of phosphorus adsorption in surface sediment at channel confluences: Field and laboratory experimental evidence

机译：河道汇合处表层沉积物中磷吸附的空间变异性：现场和实验室实验证据

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摘要

Field surveys and a laboratory experiment have been conducted to characterize the spatial variability of phosphorus (P) adsorption in surface sediment at channel confluences with a large tributary discharge. The results show that the grain size of surface sediment and the concentration of soluble reactive phosphorus in overlying water are the most important factors affecting the spatial variability of P in surface sediment. Their differences in the two combining flows can be reduced dramatically by the mixing layer, and the mixing distance can be largely decreased by the distortion of the shear layer and the complex bed morphology as they can increase the transverse mixing of the two combining flows. The influence of hydrodynamics is highlighted especially when other factors were comparable in the two tributaries. The downwelling flow shall improve the hyporheic exchange and induce more P to be absorbed onto the bed sediment at channel confluences. The horizontal flow velocity shall be a more appropriate indicator of the influence of hydrodynamics on P enrichment. Thus, the region of flow separation is beneficial to P adsorption, while the region of shear layer and maximum flow velocity are adverse to P enrichment. All these results help to better understand and predict the spatial variability of P adsorption in surface sediment at channel confluences.
机译：已经进行了野外调查和实验室实验，以表征具有大支流排放的河道汇合处表层沉积物中磷（P）吸附的空间变异性。结果表明，表层沉积物的粒径和上覆水中可溶性反应性磷的浓度是影响表层沉积物中磷空间变异性的最重要因素。通过混合层可以显着减小它们在两种结合流中的差异，并且通过剪切层的变形和复杂床层的形态可以大大减小混合距离，因为它们可以增加两种结合流的横向混合。突出了流体动力学的影响，尤其是当两个支流中的其他因素具有可比性时。下行流将改善水流交换，并在通道汇合处诱导更多的P被吸收到床沉积物上。水平流速应是水动力对磷富集影响的更合适的指标。因此，流动分离区域有利于磷的吸附，而剪切层区域和最大流速则不利于磷的富集。所有这些结果有助于更好地了解和预测通道汇合处地表沉积物中P吸附的空间变异性。

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  • 来源
    《Journal of hydro-environment research》 |2018年第2期|25-36|共12页
  • 作者

    Yuan Saiyu; Tang Hongwu; Xiao Yang; Chen Xi; Xia Yang; Jiang Zhaoyu;

  • 作者单位

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;

    Huaihe River Basin Water Resources Protect Bur, Bengbu 233000, Peoples R China;

    Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Jiangsu, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Channel confluence; Field survey; Laboratory experiment; Phosphorus; Surface sediment;

    机译：通道汇合;野外调查;实验室实验;磷;表面沉积物;

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