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Application of surface‐subsurface flow coupled with numerical simulator to runoff analysis in an actual field
Author(s) -
Itoh Kazumasa,
Tosaka Hiroyuki,
Nakajima Kitao,
Nakagawa Masahiro
Publication year - 2000
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/(sici)1099-1085(20000228)14:3<417::aid-hyp946>3.0.co;2-o
Subject(s) - hydrograph , surface runoff , discretization , subsurface flow , runoff model , sensitivity (control systems) , flow (mathematics) , environmental science , computer simulation , hydrology (agriculture) , geotechnical engineering , geology , computer science , simulation , mathematics , groundwater , engineering , geometry , mathematical analysis , ecology , electronic engineering , biology
A numerical simulator that treats three dimensional, multiphase, surface‐subsurface combined flows was applied to actual runoff analysis. A sensitivity study of hydraulic surface/subsurface interaction parameters required in numerical simulation was carried out utilizing short‐term data, and a set of parameters that reproduces an actual hydrograph was obtained. To improve reproducibility of the hydrograph, a modification of discretization in expressing riverbed was introduced, so that a more realistic hydrograph is reproduced and a better quantitative estimation about base and side flow is realized. Applying the result of the sensitivity study to long‐term runoff analysis, the hydrograph in one year was reproduced satisfactorily with the same hydraulic parameters obtained in the short‐term runoff analysis. Copyright © 2000 John Wiley & Sons, Ltd.