例文
- By the method used in 13 , 32 , one can estimate the mean depth d and the effective length l in each grid . the slope of the aquifer can also be calculated through an analysis of the digital elevation model . the two parameters a and b in the quasi - steady subsurface model can be calculated by the following method : the nonlinearity parameter b is taken to be 2 . 0 , the parameter a can be calculated by plotting the values for dq dt versus q in a log - log graph 13
