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Self-purification process and retention of nitrogen in floodplains of River Nemunas

机译：Nemunas河漫滩的自净过程和氮的保留

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摘要

Due to its catchment size and its significant level of agricultural pollution, the Nemunas river basin has been identified as an agricultural hot spot in the Baltic Sea basin. On average, the total annual inorganic nitrogen runoff into the river is 26.9 × 10~6kg, which corresponds to a load of 275kgkrrr~(-2)yr~(-1). A submerged floodplain, covering 605km2 of the River Nemunas lowland, maintains the natural retention threshold for pollutants in the water of the main canal and the outfall at Curonian Lagoon, as well as improving farming conditions in the inundated meadows of the valley. It also increases the sedimentation and nitrogen retention capacities of the Nemunas catchment. It has been estimated that about 40% of the fine suspended sediments can be retained and deposited in the flooded meadows of the delta. Controlled inundation of the floodplains in the Nemunas delta may reduce its runoff nitrogen load by 21 kg km~(-2) per flood event. As a result, nitrogen concentration decreases by approximately 8-10%, causing a self-purification process in the flooded area. Nitrogen retention is dependent upon the velocities of the flood current and has mostly been observed in zones of stagnating water.
机译：由于其流域规模和农业污染的严重程度，尼穆纳斯河流域已被确定为波罗的海流域的农业热点。平均每年流入河流的无机氮总量为26.9×10〜6kg，相当于275kgkrrr〜（-2）yr〜（-1）。淹没的平原占地605平方公里的尼穆纳斯河低地，保持了主要运河的水和库尔斯沙嘴泻湖的出水口污染物的自然保留阈值，并改善了被淹没的山谷草地的耕作条件。它还增加了尼玛纳斯流域的沉积和固氮能力。据估计，约有40％的细小悬浮沉积物可以保留并沉积在三角洲被淹的草地上。尼穆纳斯河三角洲洪泛区的受控淹没可能使每个洪灾事件的径流氮负荷降低21 kg km〜（-2）。结果，氮浓度降低了大约8-10％，从而在水灾地区引起了自净过程。氮的保留取决于洪水的速度，并且大多数在停水区域观察到。

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  • 来源
    《Hydrology research》 |2010年第4期|P.338-345|共8页
  • 作者

    Saulius Vaikasas; Antanas Dumbrauskas;

  • 作者单位

    Water Management Institute of Lithuanian University of Agriculture,Parko-6, vilainiai,LT-58102 Kedainiai,Lithuania Lithuanian University of Agriculture,studentu 11, Akademija,lt-53361 Kaunas District,Lithuania;

    rnLithuanian University of Agriculture,studentu 11, Akademija,lt-53361 Kaunas District,Lithuania;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    floodplain; flow; nitrogen; retention; sediment;

    机译：洪泛区流;氮;保留;沉淀;

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