Comparison of three evaluation applications in hydrologic frequency computation
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Abstract:
The principle of parameter selections in the hydrologic frequency calculation is that the theoretical frequency curve matches with the empirical points. In this paper, three fitting evaluation applications and their advantages and disadvantages in the hydrologic frequency calculation are investigated, including Excel, frequency calculation software, and set pair analysis. T he Excel method and frequency calculation software use the sum of deviation square as the parameter selection criteria but it is in2 sensitive. According to connection number and the amount of a, b and c, the fitting degree between the frequency curve and measured points is analyzed by set pair analysis. This is a new way to evaluate the fitting of frequency curve quantitatively, which can avoid the subjective arbitrariness of current curve fitting methods.
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