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KMID : 1024520150240040515
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Journal of the Environmental Sciences
2015 Volume.24 No. 4 p.515 ~ p.524
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Development of Agricultural Groundwater Usage Model Considering Multipurpose Water in Jeju Island
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An Jung-Gi
Song Sung-Ho
Lee Dong-Rim
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Abstract
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The estimation of groundwater usage in Jeju island is important to understand hydrologic cycle system and to plan management of water resource because large amounts of groundwater have been used for agricultural and domestic purpose. The model has been developed to estimate agricultural groundwater usage for garlic at uplands and citrus at orchards raising outdoors using the soil water balance model from FAO 56, respectively. The total amount of water supplied for the crop evapotranspiration and the multipurpose function such as sprout promotion can be simulated by the model. However, due to the discrepancy of water use in initial stage between calculated and observed, the model was calibrated and verified using actual groundwater usage monitoring data for 3.5 years (2011.6 to 2014.12) at three uplands for garlic and three orchards for citrus. Consequently, it would be concluded that the model simulated efficiently actual water usage in that root mean square (RMS) and normalized RMS of the validation stage were less than 8.99 mm and 2.43%, respectively, in two different conditions.
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KEYWORD
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Agricultural groundwater usage, Citrus, Crop evapotranspiration, Garlic, Multipurpose water, Soil water balance model
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