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http://dx.doi.org/10.5389/KSAE.2014.56.2.001

Modeling System for Unsteady Flow Simulations in Drainage Channel Networks of Paddy Field Districts  

Kang, Min Goo (미래자원연구원)
Publication Information
Journal of The Korean Society of Agricultural Engineers / v.56, no.2, 2014 , pp. 1-9 More about this Journal
Abstract
A modeling system is constructed by integrating an one-dimensional unsteady flow simulation model and a hydrologic model to simulate flood flows in drainage channel networks of paddy field districts. The modeling system's applicability is validated by simulating flood discharges from a paddy field district, which consists of nine paddy fields and one drainage channel. The simulation results are in good agreement with the observed. Particularly, in the verification stage, the relative errors of peak flows and peak depths between the observed and simulated hydrographs range 8.96 to 10.26 % and -10.26 to 2.97 %, respectively. The modeling system's capability is compared with that of a water balance equation-based model; it is revealed that the modeling system's accuracy is superior to the other model. In addition, the simulations of flood discharges from large-sized paddy fields through drainage channels show that the flood discharge patterns are affected by drainage outlet management for paddy fields and physical characteristics of the drainage channels. Finally, it is concluded that to efficiently design drainage channel networks, it is necessary to analyze the results from simulating flood discharges of the drainage channel networks according to their physical characteristics and connectivities.
Keywords
Unsteady flow; paddy fields; drainage channel network; hydraulic characteristics; drainage outlet management;
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