Concordance measures of a new class of bivariate Copula

We study the concordance measures Kendall's σ and Spearman's ρ of a new class of bivariate Copulas. Taking the relief factors of debris flow of drainage height difference and cutting degree for the example, we calculate the concordance measures σ and ρ of the two relief factors, with the relationship of them can be better prepared to that of the new class of Copulas. Furthermore, the value ranges of σ and ρ in the values of the four parameters are discussed to set out a few specific Copulas, which can be better fitting to the dependence structure of drainage height difference and cutting degree.