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Applying Water Footprint Model to Estimate Water Requirements of Rice Crops
Crop water requirements and irrigation scheduling are important in agricultural production. Recently, Arjen Hoekstra’s water footprint model has been used to determine crop water use effectively, in which the total water-required volume, including surface and groundwater, precipitation, and fresh water to assimilate pollutants, is computed based on weather condition, land cover, and topography in the study area. This study applies the water footprint model to estimate the water use for a rice crop in Phu Yen Province, Vietnam, in which input data was collected during the period from December 2015 to April 2016, also called the winter-spring rice crop. The input data consist of in situ measurements from meteorological stations, ASTER GDEM data and Landsat 8 images. The meteorological measurements, including air temperature, humidity, wind speed, hours of solar radiation and precipitation, in combination with the topographical factors derived from the ASTER GDEM data are used to determine reference crop evapotranspiration (ET0). Moreover, INDVIs, derived from Landsat-8 images, corresponding to rice-growth stages, are used to determine crop evapotranspiration (ETC). Rice crop water requirements are estimated based on the indicators ET0 and ETC. A processing of the input data for estimating rice crop water use is designed, using the ArcGIS Model Builder Tool. The results indicate that for the whole Phu Yen province, a spatial pattern of water requirements of the rice crop is different, and additionally, for yielding one ton of rice, the total water use requires an average of 395,69 m3, in which the green, blue, and grey water footprints are 14.25%, 80.67%, and 5.08%, respectively.
Applying Water Footprint Model to Estimate Water Requirements of Rice Crops
Crop water requirements and irrigation scheduling are important in agricultural production. Recently, Arjen Hoekstra’s water footprint model has been used to determine crop water use effectively, in which the total water-required volume, including surface and groundwater, precipitation, and fresh water to assimilate pollutants, is computed based on weather condition, land cover, and topography in the study area. This study applies the water footprint model to estimate the water use for a rice crop in Phu Yen Province, Vietnam, in which input data was collected during the period from December 2015 to April 2016, also called the winter-spring rice crop. The input data consist of in situ measurements from meteorological stations, ASTER GDEM data and Landsat 8 images. The meteorological measurements, including air temperature, humidity, wind speed, hours of solar radiation and precipitation, in combination with the topographical factors derived from the ASTER GDEM data are used to determine reference crop evapotranspiration (ET0). Moreover, INDVIs, derived from Landsat-8 images, corresponding to rice-growth stages, are used to determine crop evapotranspiration (ETC). Rice crop water requirements are estimated based on the indicators ET0 and ETC. A processing of the input data for estimating rice crop water use is designed, using the ArcGIS Model Builder Tool. The results indicate that for the whole Phu Yen province, a spatial pattern of water requirements of the rice crop is different, and additionally, for yielding one ton of rice, the total water use requires an average of 395,69 m3, in which the green, blue, and grey water footprints are 14.25%, 80.67%, and 5.08%, respectively.
Applying Water Footprint Model to Estimate Water Requirements of Rice Crops
Lecture Notes in Civil Engineering
Reddy, J. N. (editor) / Wang, Chien Ming (editor) / Luong, Van Hai (editor) / Le, Anh Tuan (editor) / Phan, Vu Hien (author) / Nguyen, Anh Tuan (author)
2020-07-28
8 pages
Article/Chapter (Book)
Electronic Resource
English
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