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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/npg-2020-1
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-2020-1
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Apr 2020

01 Apr 2020

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This preprint was under review for the journal NPG but the revision was not accepted.

Application of Gamma functions to the determination of unit hydrographs

Hongyan Li and Yangzong Cidan Hongyan Li and Yangzong Cidan
  • Key Laboratory of Groundwater Resources and Environment, Ministryof Education, Jilin University, Changchun, 130021, China

Abstract. There are many methods for calculating unit hydrograph, such as analysis method, trial algorithm and least squares method. But these methods have certain requirements for flood datas and the unit hydrograph may not be optimal. Based on the theory of composition, a hydrological system was viewed as a generalized collection in this study and Gamma functions were used to simulate the basin convergence process. At the same time, the Gamma function is parameterized and the parameters of Gamma function are optimized by genetic algorithm, which is based on the minimum error between the calculation of confluence process and the measurement process, before deriving the unit hydrograph. The Collins iteration method was used to compute the unit hydrograph. The results of actual calculated examples showe that this method is more precise than other methods, while it can also illustrate the law of runoff.

Hongyan Li and Yangzong Cidan

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Hongyan Li and Yangzong Cidan

Hongyan Li and Yangzong Cidan

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Short summary
Based on the theory of composition, a hydrological system was viewed as a generalized collection and Gamma functions were used to simulate the basin convergence process. At the same time, the Gamma function is parameterized and the parameters of Gamma function are optimized by genetic algorithm,before deriving the unit hydrograph. The Collins iteration method was used to compute the unit hydrograph. This method is more precise and illustrate the law of runoff.
Based on the theory of composition, a hydrological system was viewed as a generalized collection...
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