A note on the time compression approximation

被引:19
作者
Liu, MC
Parlange, JY
Sivapalan, M
Brutsaert, W
机构
[1] Cornell Univ, Dept Agr & Biol Engn, Ithaca, NY 14853 USA
[2] Univ Western Australia, Ctr Water Res, Dept Environm Engn, Nedlands, WA 6009, Australia
[3] Cornell Univ, Sch Civil & Environm Engn, Ithaca, NY 14853 USA
关键词
D O I
10.1029/98WR02741
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this paper the work by Sivapalan and Milly [1989] is extended beyond the time of pending to estimate the errors of the time compression approximation (TCA) when an exact solution exists. The diffusion coefficient is set to be constant, and gravitational effects are not considered here. The largest error of standard TCA in calculating cumulative infiltration is about 2.5%, while its underestimate of the time to ponding is about 19%. A modified TCA is also proposed, in which the exact time of pending is used directly instead of the flux to improve the estimate of postponding infiltration. The error for the modified TCA is about half of the error for the standard TCA in predicting cumulative infiltration, and thus the modified TCA should be preferred wherever pending time is or can be measured.
引用
收藏
页码:3683 / 3686
页数:4
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