IDENTIFICATION AND SELECTION OF BEST.FlTTING CANDIDATE DISTRIBUTION FOR RAINFALL FREQUENCY ANALYSIS IN CAMERON HIGHLANDS
DOI:
https://doi.org/10.11113/mjce.v8.15566Keywords:
Cocopeat, Filter bed, Heavy metals, HYDRUS-1D, SSGM wastewaterAbstract
In frequency analysis based on analytical method, there are quite a number of probability distributions to be used for quantile estimation. The selection of inappropriate one will lead to either overestimation or underestimation of the quantiles. Thus the identification and selection of the best fitting probability distribution should be given emphasis. The L-moment method offers advantages over the conventional method of moment and thus is more reliable in the distribution identification. The focus of this study is on the identification and selection of best fitting probability distribution, based on L-moment ratio parameters and L-moment ratio diagram. The results show that the GEV (Generalized Extreme Value) distribution fits quite well to data series at most of the homogeneous regions and rainfall intervals.References
Greenwood, lA. Landwehr, 1.M., Matalas, N.C. and Wallis, J.R. (1979). "Probability Weighted Moments Definition and Relation to Parameters of Several Distributions Expressablc in Inverse Form", Water Resources Research, 15(5): 1049-1054.
Haan, c.T. (1977). Statistical Methods in Hvdrolog)', Iowa State University Press, Ames, IA.
Hosking, J.R.M. (1986). "The Theory of Probability Weighted Moments", Res. Rep. ReJ22JO, IBM Research, Yorktown Heights, N.Y. (As cited by Hosking and Wallis, 1993)
Hosking, lR.M. (1989). "Some Theoretical Results Concerning L-Moments", Res. Rep. RC14492, IBM Research, Yorktown Heights, N.Y.
Hosking. J.R.M. (1990). "L.Moments : Analysis and Estimation of
Distributions Using Linear Combinations of Order Statistics", 1. R. Statist. Soc., 52(1): 105-124.
Hosking, J.R.M. and Wallis, J.R. (1993). "Some Statistics Useful in Regional Frequency Analysis", Water Resour. Res., 29(2): 271-281.
Hosking, J.R.M., Wallis, lR. and Wood, E.F. (1985). "Estimation of the Generalized Extreme-Value Distribution by the Method of Probability~ Weighted Moments", Technometrics, 27(3) : 251-261.
Lake, K.W. (1994). Clustering Rainfall Frequencies for Klang River Basin, Master Thesis, Universiti Teknologi Malaysia. Maidment, D.R. (Ed.) (1993). Handbook of Hvdrology, McGraw-Hill Inc., New York.
Pilon, P.l. and Adomowski, K. (1992). "The Value of Regional Information to Flood Frequency Analysis Using the Method of L Moments", Can. J. Civ. Eng., 19: 137-147.
Pilon, PJ., Adomowski, K. and AIila, Y. (1991). "Regional Analysis of Annual Maxima Precipitation Using L-Moments",Atm. Res., 27: 81-92.
Viessman, W., Lewis, G.L. and Knapp, lW. (1989). Introduction to
Hvdrologv, 3rd. Edition, Harper & Row, Singapore.
Vivekananda, M. (1981). Analvsis of Rainfall Characteristics (or Hydrological Design, Undergraduate Thesis, Universiti Teknologi Malaysia, Malaysia. 9
Vogel, R.M. and Fennessey, M. (1993). "L Moment Diagrams Should Replace Product Moment Diagrams", Water Resour. Res., 29(6) : 1745-1752.
Yevjevich, V, (1972). Probability and Statistics in Hydrology, Water Resources Publications, Colorado, U.S.A.