Monthly and annual effective infiltration coefficients in Dinaric karst: example of the Gradole karst spring catchment |
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| Authors: | OGNJEN BONACCI |
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| Institution: | Civil Engineering Faculty , University of Split , 21 000 Split, Matice hrvatske 15, Croatia E-mail: obonacci@gradst.hr |
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| Abstract: | Abstract The method of “historic event” is used to generate synthetic hyetographs based on statistical analysis of precipitation data. A synthetic triangular model was developed based on rainfall data of Zioud watershed (central Tunisia) with a standard time step of one hour. A database of 2799 observed rainfall events was used to provide statistical parameters for a simple triangular-shaped hyetograph model. The developed model provides a synthetic hyetograph in dimensionless form for different storm durations (2, 3 and 4 hours). For a given season and location, the variation of the first dimensionless moment with duration was relatively small, with an average range of 13% for all the stations. The resulting dimensionless hyetographs were found to be nearly identical when they were non-dimensionalized using the rainfall depth and duration, showing some seasonal effect and insignificant effects of the rainfall duration. A good agreement between simulated and observed hyetographs was achieved based on not only visual impressions, but also statistical numerical and graphical tests. |
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| Keywords: | effective infiltration coefficient karst hydrology master depletion curve Gradole karst spring (Istria-Croatia) |
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