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Aggregates explain the high clay retention of small constructed wetlands: a micromorphological study

(2008) BOREAL ENVIRONMENT RESEARCH. 13(3). p.275-284
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Abstract
Earlier studies have shown that small constructed wetlands are more efficient as sedimentation basins for eroded soil material than expected from calculations based on detention time. It has been suggested that this is caused by sedimentation of aggregates. The present microscopic study of thin sections made from undisturbed samples of wetland sediments confirmed that the fine silt and clay fractions are present in aggregated form. Aggregates from the wetland sediments had the same mineralogical composition as those from the corresponding arable land, but were more rounded, indicating erosion during transport. To prevent breakdown of aggregates, wetlands should therefore be constructed as close to the source of erosion as possible. A correct prediction of particle retention in constructed wetlands has to take into account the presence of aggregates. Textural analysis methods, which require clay dispersion pre-treatment, are not suitable for the calculation of the retention of fine silt and clay.
Keywords
RUNOFF, SEDIMENTATION, PHOSPHORUS, EROSION, POLLUTION, RIVERS

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Citation

Please use this url to cite or link to this publication:

MLA
Sveistrup, Tore E, Vera de Melo Marcelino, and Bent C Braskerud. “Aggregates Explain the High Clay Retention of Small Constructed Wetlands: a Micromorphological Study.” BOREAL ENVIRONMENT RESEARCH 13.3 (2008): 275–284. Print.
APA
Sveistrup, T. E., de Melo Marcelino, V., & Braskerud, B. C. (2008). Aggregates explain the high clay retention of small constructed wetlands: a micromorphological study. BOREAL ENVIRONMENT RESEARCH, 13(3), 275–284.
Chicago author-date
Sveistrup, Tore E, Vera de Melo Marcelino, and Bent C Braskerud. 2008. “Aggregates Explain the High Clay Retention of Small Constructed Wetlands: a Micromorphological Study.” Boreal Environment Research 13 (3): 275–284.
Chicago author-date (all authors)
Sveistrup, Tore E, Vera de Melo Marcelino, and Bent C Braskerud. 2008. “Aggregates Explain the High Clay Retention of Small Constructed Wetlands: a Micromorphological Study.” Boreal Environment Research 13 (3): 275–284.
Vancouver
1.
Sveistrup TE, de Melo Marcelino V, Braskerud BC. Aggregates explain the high clay retention of small constructed wetlands: a micromorphological study. BOREAL ENVIRONMENT RESEARCH. 2008;13(3):275–84.
IEEE
[1]
T. E. Sveistrup, V. de Melo Marcelino, and B. C. Braskerud, “Aggregates explain the high clay retention of small constructed wetlands: a micromorphological study,” BOREAL ENVIRONMENT RESEARCH, vol. 13, no. 3, pp. 275–284, 2008.
@article{746104,
  abstract     = {Earlier studies have shown that small constructed wetlands are more efficient as sedimentation basins for eroded soil material than expected from calculations based on detention time. It has been suggested that this is caused by sedimentation of aggregates. The present microscopic study of thin sections made from undisturbed samples of wetland sediments confirmed that the fine silt and clay fractions are present in aggregated form. Aggregates from the wetland sediments had the same mineralogical composition as those from the corresponding arable land, but were more rounded, indicating erosion during transport. To prevent breakdown of aggregates, wetlands should therefore be constructed as close to the source of erosion as possible. A correct prediction of particle retention in constructed wetlands has to take into account the presence of aggregates. Textural analysis methods, which require clay dispersion pre-treatment, are not suitable for the calculation of the retention of fine silt and clay.},
  author       = {Sveistrup, Tore E and de Melo Marcelino, Vera and Braskerud, Bent C},
  issn         = {1239-6095},
  journal      = {BOREAL ENVIRONMENT RESEARCH},
  keywords     = {RUNOFF,SEDIMENTATION,PHOSPHORUS,EROSION,POLLUTION,RIVERS},
  language     = {eng},
  number       = {3},
  pages        = {275--284},
  title        = {Aggregates explain the high clay retention of small constructed wetlands: a micromorphological study},
  url          = {http://www.borenv.net/BER/pdfs/ber13/ber13-275.pdf},
  volume       = {13},
  year         = {2008},
}

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