Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
권호 표지
DOI QR코드

DOI QR Code

Determination of Equivalent Roughness for Estimating Flow Resistance in Stabled Gravel-Bed River: II. Review of Model Applicability

  • Published : 2008.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, we estimated, the equivalent roughness using an estimation model, which considered grain distribution on the bed and the protrusion height of the grains. We also reviewed the appropriateness of the estimated equivalent roughness at the Goksung and Gurey station in the Seomjin River. To review the appropriateness of this model, we presented the water level-discharge relation curve applying the equivalent roughness to the flow model and compared and reviewed it to observed data. Also, we compared and reviewed the observed data by estimating the Manning coefficient n, the Chezy coefficient C, and the Darcy-Weisbach friction coefficient f by the equivalent roughness. The calculation results of the RMSE showed within 5% error range in comparison with observed value. Therefore the estimated equivalent roughness values by the model could be proved appropriate.

Keywords

References

  1. Bergeron N. E., 1994, An Analysis of Flow Velocity Profiles, Stream bed Roughness, and Resistance to Flow in Natural Gravel Bed Streams. Ph. D Dissertation, State University of New York, Buffalo
  2. Wiberg P. L., Smith J. D., 1991, Velocity Distribution and Bed Roughness in High-Gradient Stream, Water Resources Research, 27(5), 825-838 https://doi.org/10.1029/90WR02770
  3. Martin V., 2003, Hydraulic Roughness of Armoured Gravel Beds: the Role of Grain Protrusion. Ph. D Dissertation, University of British, Columbia
  4. Einstein H. A., El-Sayed A., El-Samni., 1949, Hydrodynamic Forces on a Rough Wall, Rev. Mod. Phys., 21, 520-524 https://doi.org/10.1103/RevModPhys.21.520
  5. Coleman N. L., 1967, A Theoretical and Experimental Study of Drag and Lift Forces Acting on a Sphere Resting on a Hypothetical Stream Bed, Proc., 12th Congress, IAHR, 3, 185-192
  6. Chepil W. S., 1959, The Use of Evenly Spaced Hemispheres to Evaluate Aerodynamic Forces on a Soil Surface, Transactions, Am. Geophysical Union, 39, 397-404
  7. Kamphuis J. W., 1974, Determination of Sand Roughness for Fixed Beds, Journal of Hydraulics Research, 12(2), 193-202 https://doi.org/10.1080/00221687409499737
  8. Gessler J., 1990, Friction Factor of Armored River Beds, Journal of Hydraulics Engineering, ASCE, 116(4), 531-543 https://doi.org/10.1061/(ASCE)0733-9429(1990)116:4(531)
  9. Bray D. I., 1980, Evaluation of Effective Boundary Roughness for Gravel-Bed River, Can. J. Civ. Eng., 7, 392-397 https://doi.org/10.1139/l80-047
  10. Hey R. D., 1979, Flow Resistance in Gravel-Bed Rivers, Journal of the Hydraulics Division, ASCE, 105(4), 365-379
  11. Wark J. B., Samuels P. G., Ervine D. V., 1990, A Practical Method of Estimating Velocity and Discharge in a Compound Channel, Flood Hydr., W. R. while, ed., John Wiley and Sons, Inc., Chichester England, 163-172
  12. Darby S. E., Thorne C. R., 1996, Predicting Stage- Discharge Curve in Channels with Bank Vegetation, Journal of Hydraulics Engineering, ASCE, 122(10), 583-586 https://doi.org/10.1061/(ASCE)0733-9429(1996)122:10(583)