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Title: Simplified two-parameter gamma distribution for derivation of synthetic unit hydrograph
Authors: Bhunya P.K.
Mishra, Surendra Kumar
Berndtsson R.
Published in: Journal of Hydrologic Engineering
Abstract: Several methods for synthetic unit hydrographs are available in the literature. Most of them involve manual, subjective fitting of a hydrograph through few data points. Because it is difficult, the generated unit hydrograph is often left unadjusted for unit runoff volume. To circumvent this problem, a simplified version of the existing two-parameter gamma distribution is introduced to derive a synthetic hydrograph more conveniently and accurately than the popular Gray, Soil Conservation Service, and Synder methods. The revised version incorporates the approximate, but accurate, empirical relations developed for the estimation of β and λ (factors governing the shape of the dimensionless unit hydrograph) from the Nash parameter n (=number of reservoirs). The Marquardt algorithm was used to develop the nonlinear relationships. The applicability of the simplified version is tested on both text and field data.
Citation: Journal of Hydrologic Engineering (2003), 8(4): 226-230
Issue Date: 2003
Keywords: Gamma function
ISSN: 10840699
Author Scopus IDs: 8268278000
Author Affiliations: Bhunya, P.K., National Institute of Hydrology, Roorkee, Uttaranchal 247 667, India
Mishra, S.K., National Institute of Hydrology, Roorkee, Uttaranchal 247 667, India
Berndtsson, R., Dept. of Water Resources Engineering, Lund Institute of Technology, Lund Univ., Lund, Sweden
Corresponding Author: Bhunya, P.K.; National Institute of Hydrology, Roorkee, Uttaranchal 247 667, India
Appears in Collections:Journal Publications [WR]

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