An Efficient Method Of The Suspended Sediment-Discharge Measurement Using Entropy Concept

  • Choo, Tai-Ho (Assistant Manager, Pusan Regional Office, KOWACO)
  • Published : 2000.04.01

Abstract

A method is presented which enables easily the computation of the suspended sediment discharge as the mean sediment concentration and mean flow velocity. This method has significant advantages over the traditional method, which principally depend on a set of measured concentration data. The method is based on both a new sediment concentration and mean sediment concentration equations which have been derived from the entropy concept used in statistical mechanics and information theory: (1) The sediment concentration distribution equations derived, are capable of describing the variation of the concentration in the vertical direction. (2) The mean concentration equation derived, is capable of calculating easily the mean concentration by using only one measured concentration in open channel. The present study mainly addresses the following two subjects : (1) new sediment concentration and mean sediment concentration equations are derived from the entropy concept : (2) An efficient and useful method of suspended sediment-discharge measurements is developed which can facilitate the estimation of suspended sediment-discharge in open channel. Flume and laboratory data are used to carry out the research task outlined above. An efficient method for determining the suspended sediment-discharge in the open channel has been developed. The method presented also is efficient and applicable in estimating the sediment transport in rivers and the sediment deposit in the reservoirs, and can drastically reduce the time and cost of sediment measurements.

Keywords

References

  1. Amoroco, J. and Espildora, B. (1973). 'Entropy in the Assesment of Uncertainty of Hydrologic Systems and Models.' Water Resources Research, Vol. 9, No. 6, pp. 1515-1522
  2. Chiu, C.-L. and Chiou, J.-D. (1986). 'Structure of 3-D. Flow in Rectangular Open Channels.' Journal of Hydraulic Engineering. ASCE. Vol. 112, No. 11, pp. 1050-1068
  3. Chiu, C.-L.(1987), 'Entropy and Probability Concepts in Hydraulics.' Journal of Hydraulic Engineering. ASCE. Vol. 113, No. 5, pp. 583-600
  4. Chiu, C.-L.(1989). 'Entropy and 2-D. Velocity Distribution in Open Channel Flows.' Journal of Hydraulic Engineering. ASCE. Vol. 114, No. 7, pp. 738-756
  5. Chiu, C.-L.(1989). 'Velocity Distribution in Open Channel Flows.' Journal of Hydraulic Engineering. ASCE. Vol. 115, No. 5, pp. 576-594
  6. Chiu, C.-L.(1991). 'Application of Entropy Concept in Open Channel Flow.' Journal of Hydraulic Engineering. ASCE. Vol. 117, No. 5, pp. 615-628
  7. Chiu, C.-L.(1995). 'Maximum and Mean Velocity and Entropy in Open Channel Flow.' Journal of Hydraulic Engineering. ASCE. Vol. 121, No. 1, pp. 26-35 https://doi.org/10.1061/(ASCE)0733-9429(1995)121:1(26)
  8. Coleman, N.L. (1981). 'Velocity Profiles with Suspended Sediment.' Journal of Hydrauic Research. IAHR. Vol. 19, No. 3, pp. 211-229
  9. Coleman, N.L. (1986). 'Effects of Suspended Sediment on the Open-Channel Velocity Distribution.' Journal of Water Resources Research. Vol. 22, No. 10, pp. 1377-1384
  10. Choo T.H. (1998). 'An Efficient Method of Discharge Measurement in Sandy Rivers.' Ph.D. Dissertation, University of Pittsburgh, Pitsburgh, U.S.A.
  11. Shannon, C.E. (1948). 'A Mathematical Theory of Communication.' Bell System Technical Journal. Vol. 27, No. 3, pp. 279-423 and 623-659
  12. Singh, V.P. (1997a). 'The Use of Entropy in Hydrology and Water Resources.' hydrological processes. Vol. 11, pp. 587-626 https://doi.org/10.1002/(SICI)1099-1085(199705)11:6<587::AID-HYP479>3.0.CO;2-P
  13. Singh, V.P. (1997b). 'Effect of Class Interval Size on Entropy.' Stochastic hydrology and hydraulics. Vol. 11, pp. 423-431 https://doi.org/10.1007/BF02427927
  14. Singh, V.P. and Guo, H. (1997). 'Parameter Estimation for 2-parameter Generalized Pareto Distribution by POME.' Stochastic hydrology and hydraulics. Vol. 11, No. 3, pp. 211-228 https://doi.org/10.1007/BF02427916
  15. Singh, V.P. (1998). 'Entropy-based Parameter Estimation in Hydrology.' Kluwer Academic Publishers, Boston
  16. Van Rijn, L. C. (1981). 'Model for Sedimentation Predictions.' Nineteenth Congress IAHR, New Delhi, India Publication No. 241
  17. Van Rijn, L. C. (1981). 'Computation of Bed-Load Concentration and Transport.' Report S487-I
  18. Van Rijn, L. C. (1982). 'Computation of Bed-Load and Suspended Load.' Report S487-II
  19. Van Rijn, L. C.(1984). 'Sediment Transport, Part I: Bed Load Transport.' Journal of Hydraulic Engineering. ASCE, Vol. 110, No. 10, 1431-1457
  20. Van Rijn, L. C. (1984). 'Sediment Transport, Part II: Suspended Load Trasport.' Journal of Hydraulic Engineering. ASCE, Vol. 110, No. 11, 1613-1641
  21. Vanoni, V. A., and Brooks, N. H.,(1957). 'Laboratory Studies of the Roughness and Supended Load of Alluvial Streams.' Sedimentation Laboratory, California Institute of Technology, Report E-68, Pasadena, California
  22. Xia R.(1997). 'Relation Between Mean and Maximum Velocities in a Natural River.' Journal of Hydraulic Engineering. ASCE. Vol. 123, No. 8, pp. 720-723 https://doi.org/10.1061/(ASCE)0733-9429(1997)123:8(720)