5Stefan J. Uber die Theorien des Eisbildung insbesondere tiber die Eisbildung in Polarmure [ Z ] . Wien Sitzunsber. Akad. Wiss. , Ser. A, pt. 1889.
6Shen H T, Yapa P D . A unified degree-day method for river ice cover thickness simulation [J] . Can. J. Civ. Eng. , 1985, 18(1) : 54-62.
7Bilello M A. Maximum thickness and subsequent decay of lake, river and fast sea ice in Canada and Alaska[R] . CRREL Report 80-6, U . S. Army Cold Regions Research and Engineering Laboratory, Hanover, NH, 160 P. 1980.