Application of Budyko framework to irrigation districts in China under various climatic conditions. Issue 3 (23rd March 2022)

• Record Type: Journal Article
• Authors: Chen, Hang; Huo, Zailin; Zhang, Lu; Cui, Jing; Shen, Yingying; Han, Zhenzhong
• Is Part Of: Hydrological processes. Volume 36:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-23
• Subjects: Budyko hypothesis -- empirical equation -- irrigation districts -- NDVI and soil properties; Hydrology -- Periodicals; Hydrology -- Research -- Periodicals; Hydrologic models -- Periodicals; Hydrological forecasting -- Periodicals; 631.432
• DOI: 10.1002/hyp.14542
• Languages: English
• ISSNs: 0885-6087

Abstract

Abstract: Budyko's framework has been widely used to study basin‐scale water balance. In this study, we focus on the extended application of Fu's equation (one formulation of the Budyko‐type curves) to 371 large irrigation districts in China over a period of 2010–2017. Water balance method was used to estimate actual evapotranspiration ET in the irrigated areas. Considering the contribution of shallow groundwater to ET, the water availability in the Budyko framework defined as equivalent precipitation P e for irrigation areas is the sum of irrigation water I, precipitation P and groundwater evaporation ET gw . Results showed that the relationships between evapotranspiration ET, water availability P e and energy supply ET 0 can be accurately described by the Budyko's curves. The optimal values of Budyko parameter ω for each irrigation district was obtained with multi‐annual data using least square method. The Fu's equation performed better in humid and semi‐humid regions than arid and semi‐arid regions. The comparison between ∂ET / ∂ P e and ∂ET / ∂ ET 0 confirmed the relative effect of water availability and energy supply on ET according to the variation of climatic conditions. Normalized difference vegetation index (NDVI) and soil properties (denoted by the proportion of clay and sand) were selected to develop empirical equation for parameter ω using multiple linear regression analysis method. This study shows that the Budyko framework can be extended to irrigation areas and provides useful information on evapotranspiration to assist in water management in irrigation areas. Abstract : Irrigation water and shallow groundwater consumption should be included in water availability when the Budyko framework is applied to irrigation districts. Dominant roles affecting evapotranspiration variation vary with the climatic conditions. Normalized difference vegetation index and soil properties are mainly responsible for the variation in the Budyko parameter.