Oxygen Transfer through Air Entrainment in Riparian Riffles: A Case Study of Seomjin River, Korea
DOI:
https://doi.org/10.11113/jt.v74.4545Keywords:
Oxygen transfer, air entrainment, riffle, flow velocity, Froude numberAbstract
Field investigation on the oxygen transfer through the air entrainment, the riffle geometries, and the relationships between the efficiency of the oxygen transfer and the hydraulic parameters in the riparian riffles were performed. Investigation of the air entrainment and measurements of the oxygen transfer in the riffles were conducted. Types of bed height in the riffles were upward convex. Slopes of the water surface and the river bed were steeper at the downstream rather than at the upstream part. Air entrainment occurred more frequently in the edged gravels rather than in the round and edgeless gravels, and it was formed mainly from behind the trailing edges of the gravels. Oxygen transfer was found to be proportional to the flow velocity, the flow discharge, and the Froude number, but not closely related to the particle diameter. Average value of oxygen transfer in the riffles of the study area was about 0.085, which shows good habitat condition for the aquatic creatures.Â
References
Hong, I., Gang, J. G., and Yeo, H. G. 2012. Study on Characteristics of Riffle-Pool Sequence in Reaches of Namdae Stream. Proceedings of 2012 Conference of KWRA. 972–973.
Kim, J. H. 2003. Hydraulic Analysis of Oxygen Transfer through Air Entrainment in Riparian Riffles. Water Engineering Research. 4(3): 127–139.
Chanson, H. 1993. Self-aerated Flows on Chute and Spillways. Journal of the Hydraulic Engineering, ASCE. 119(2): 220–243.
Yang, J. Y. 2006. A Study on Fish Swimming Behavior by Riffle Characteristics. Master’s Dissertation, Chung-Ang University.
Chibana, T., Tsujimoto, T., Miyake, M., Sasaki, G., and Iwamoto, H. 2005. Hierarchical Analysis of Physical Environment in Riffles. Proceedings of the 2nd Annual Joint Seminar between Korea and Japan. 69–74.
Lee, H. S. and Kim, J. H. 1999. Site Investigation on the Flow Features of The Self-aerated Riffles. Proceedings of 1999 KSCE. 2: 315–318. (In Korean).
Kim, J. H. 2015. Oxygen Transfer through Air Entrainment over Stepped Weir. Applied Mechanics and Materials. 744–746: 2297–2230.
Avery, S. T. and Novak, P. 1978. Oxygen Transfer at Hydraulic Structures. Journal of the Hydraulics Division, ASCE. 104(11): 1521–1540.
Henry, T. 1985. Air-water Flow in Hydraulic Structures. Water Resources Technical Publication, Engineering Monograph. 41: 251–285.
Chanson, H. 1997. Measuring Air-water Interface Area in Supercritical Open Channel Flow. Water Research, IAWPRC. 31(6): 1414–1420.
Gullivers, J. S., Thene, J. R., and Rindels, A. J. 1990. Indexing Gas Transfer in Self-aerated Flows. Journal of Environmental Engineering, ASCE. 116(3): 503–523.
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