7[1]Centre for Civil Engineering Research and Codes(CUR),Technical Advisory Committee on Water Defence(TAW).Guide for the Design of River Dikes,volume 1-upper river area[M].W.D.Meinema Lid,The Netherlands,1991.
8[2]Joannes B Sellmeijer.On the Mechanism of Piping Under Impervious Structures[D].PhD thesis,Technical University of Delft,The Netherlands,1988.
