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Evaluating the influence of wetland vegetation on chemical residence time in Mississippi Delta drainage ditches

Author

Listed:
  • Kröger, R.
  • Moore, M.T.
  • Locke, M.A.
  • Cullum, R.F.
  • Steinriede Jr., R.W.
  • Testa III, S.
  • Bryant, C.T.
  • Cooper, C.M.

Abstract

The presence of emergent vegetation within channelized aquatic environments has the capacity to provide a number of biological functions as well as alter the hydrology of the system. Vegetation within the channel exerts roughness, drag and friction on flowing water, reducing flow rates, increasing water depths and increasing hydraulic retention time. By increasing the hydraulic retention time, chemical residence time (CRT) is increased, thus improving the potential of pollutant mitigation. The study compared two geomorphologically similar drainage ditches, one vegetated and one non-vegetated to evaluate the effect obligate, in-stream wetland vegetation had on CRT. A fluoride (F-) tracer was amended to both ditches with nutrients and sediments to simulate stormwater runoff event. The measured CRT of the vegetated drainage ditch was at least twice that of the non-vegetated ditch. These results suggest that with the presence of vegetation increasing CRT, chemical removal rates will improve, and as a result increase the possibility of microbial transformation, adsorption, and macrophyte assimilation. By dredging or clear-scraping ditches and removing the vegetative component, farmers and managers alike will increase water flows, decrease CRT and potentially increase pollutant loads into aquatic receiving systems.

Suggested Citation

  • Kröger, R. & Moore, M.T. & Locke, M.A. & Cullum, R.F. & Steinriede Jr., R.W. & Testa III, S. & Bryant, C.T. & Cooper, C.M., 2009. "Evaluating the influence of wetland vegetation on chemical residence time in Mississippi Delta drainage ditches," Agricultural Water Management, Elsevier, vol. 96(7), pages 1175-1179, July.
    • Handle: RePEc:eee:agiwat:v:96:y:2009:i:7:p:1175-1179
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    References listed on IDEAS

    as
    1. Kröger, R. & Cooper, C.M. & Moore, M.T., 2008. "A preliminary study of an alternative controlled drainage strategy in surface drainage ditches: Low-grade weirs," Agricultural Water Management, Elsevier, vol. 95(6), pages 678-684, June.
    2. Li, Zhe & Zhang, Juntao, 2001. "Calculation of Field Manning's Roughness Coefficient," Agricultural Water Management, Elsevier, vol. 49(2), pages 153-161, July.
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