Volume 19, Issue 72 (summer 2015)                   jwss 2015, 19(72): 11-21 | Back to browse issues page

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Ghamarnia H, Sasani F. Evaluation of SIMDualKC Using Lysimetric Data for Estimating Daily Evapotranspiration of (Coriandrum Sativum L. (. jwss 2015; 19 (72) :11-21
URL: http://jstnar.iut.ac.ir/article-1-3055-en.html
Dept. of Water Eng., Campus of Agric. and Natur. Res. Razi Univ. of Kermanshah, Kermanshah, Iran. , hghamarnia@razi.ac.ir
Abstract:   (14046 Views)
The SIMDualKc model is an irrigation scheduling simulation model that uses dual crop coefficient method for estimating ETc by computing two separate soil water balances in daily time-step, one for the soil evaporation layer from which Ke is computed, and the other one for the entire root zone to compute the actual Kcb adjusted to the soil moisture conditions. In this study, lysimetric measurements of evapotranspiration rates relative to (Coriandrum sativum L.) during 2 years were used for model calibration and validation. Kcb values for coriandrum were found as 0.21 for the initial, 1.12 for the mid-season and 0.79 at harvesting period. Model results have shown a good agreement between the actual daily evapotranspiration predicted by the model and the ones resulting in water balance calculation on drainable lysimeters, and root mean square errors of estimates (RMSE) of about 1.64 mm and 1.53 mm for the calibration and validation, respectively.The modeling efficiency EF and the index of agreement dIA were equal to 0.8 and 0.93, respectively, thus indicating good performance of modeling with SIMDualKc. Model estimates of evaporation (E) for validation and calibration years displayed an average of 181 mm, representing 25% of ETc. In conclusion, results show that the model is appropriate to simulate the daily evapotranspiration adopting the dual Kc approach for coriandrum in west regions of Iran.
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Type of Study: Research | Subject: Ggeneral
Received: 2015/08/23 | Accepted: 2015/08/23 | Published: 2015/08/23

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