Surface Drainage Simulation Model for Irrigation Districts Composed of Paddy and Protected Cultivation
2013
Song, J.H., Seoul National University, Seoul, Republic of Korea | Kang, M.S., Seoul National University, Seoul, Republic of Korea | Song, I.H., Seoul National University, Seoul, Republic of Korea | Hwang, S.H., Seoul National University, Seoul, Republic of Korea | Park, J.H., Seoul National University, Seoul, Republic of Korea | Ahn, J,H., Seoul National University, Seoul, Republic of Korea
The objectives of this study were to develop a hydrologic simulation model to estimate surface drainage for irrigation districts consisting of paddy and protected cultivation, and to evaluate the applicability of the developed model. The model consists of three sub-models; agricultural supply, paddy block drainage, and protected cultivation runoff. The model simulates daily total drainage as the sum of paddy field drainage, irrigation canal drainage, and protected cultivation runoff at the outlets of the irrigation districts. The agricultural supply sub-model was formulated considering crop water requirement for growing seasons and agricultural water management loss. Agricultural supply was calculated for use as input data for the paddy block sub-model. The paddy block drainage sub-model simulates paddy field drainage based on water balance, and irrigation canal drainage as a fraction of agricultural supply. Protected cultivation runoff is calculated based on NRCS (Natural Resources Conservation Service) curve number method. The Idong reservoir irrigation district was selected for surface drainage monitoring and model verification. The parameters of model were calibrated using a trial and error technique, and validated with the measured data from the study site. The model can be a useful tool to estimate surface drainage for irrigated districts consisting of paddy and protected cultivation.
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