Preprints
https://doi.org/10.5194/hess-2021-80
https://doi.org/10.5194/hess-2021-80

  22 Apr 2021

22 Apr 2021

Review status: this discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.

The application of Budyko framework to irrigation districts in China under various climatic conditions

Hang Chen1, Zailin Huo2, Lu Zhang3, Jing Cui4, Yingying Shen4, and Zhenzhong Han4 Hang Chen et al.
  • 1College ofCivil EngineeringandArchitecture, Guangxi University, Nanning530000, PR China
  • 2Centre for Agricultural Water Research in China, China Agricultural University, Beijing 100083, PR China
  • 3CSIRO Land and Water, Canberra, ACT2601, Australia
  • 4China Irrigation and Drainage Development Centre, Beijing 100054, PR China

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 (Pe) for irrigation areas is the sum of irrigation water (I), precipitation (P) and groundwater evaporation (ETgw). Results showed that the relationships between evapotranspiration (ET), water availability (Pe) and energy supply (ET0) can be accurately described by the Budyko's curves. The Fu's equation performed better in humid and semi-humid regions than arid and semi-arid regions. The comparison between δETPe and δETET0 confirmed the relative effect of water availability and energy supply on ET according to the variation of climatic conditions. The optimal values of Budyko parameter ω for each irrigation district was obtained with multi-annual data using least square method. Normalized Difference Vegetation Index (NDVI) and soil property (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 showed that the Budyko framework can be extended to irrigation areas and provide useful information on evapotranspiration to assist in water management in irrigation areas.

Hang Chen et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-80', Anonymous Referee #1, 27 May 2021
  • RC2: 'Comment on hess-2021-80', Anonymous Referee #2, 11 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-80', Anonymous Referee #1, 27 May 2021
  • RC2: 'Comment on hess-2021-80', Anonymous Referee #2, 11 Jun 2021

Hang Chen et al.

Hang Chen et al.

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Short summary
With a parameter introduced, Fu's equation has been widely used to study the water allocation in natural catchments. For agricultural irrigation districts, the extra water sources including groundwater evaporation were considered as water availability to improve the applicability of Fu's equation in unsteady-state districts. Soil texture and vegetation cover have been considered to investigate the relationship between irrigation districts characteristics and Budyko parameter.