Effects of Hydro-Meteorological Factors on Streamflow Withdrawal for Irrigation

crossref(2021)

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摘要
Abstract The relationships between a variety of hydro-meteorological variables and irrigation water use rates (WUR) were investigated in this study. Standardized Precipitation Index (SPI), Potential Evapotranspiration (PET), and Normalized difference vegetation index (NDVI) are explored in order to identify the relationship with the WUR. The Yeongsan river basin which agricultural land is mostly occupied by well-irrigated paddy was used for the pilot study. 4 different temporal scale of SPI-3, 6, 9, and 12-were tested, and PET was calculated using Thornthwaite method. To calculate NDVI, the surface spectral reflectance data, which was acquired by Moderate Resolution Imaging Spectroradiometer (MODIS) equipped on Terra satellite, were used. As a result, there was a statistically significant relationship between SPI9 and the WUR during drought period in which negative values of SPI9 occurred. Besides, the WUR was strongly correlated with both PET and NDVI. Comparing to SPI, the variability of WUR in this study area was more sensitively affected by PET and NDVI which can cause potential lack of agricultural water supply. Based on the finding of this study, it implies that SPI9, PET, and NDVI are the critical factors for predicting water withdrawal during drought conditions so that they can be used for the irrigational water use management. Although the findings of this study have been suggested by a few previous studies, this study has its novelty in quantifying those discussions using actual field observations of streamflow withdrawal for irrigation.
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