The phenological soil water balance: a proposed model for estimating water resources for an entire watershed using crop coefficients

Authors

DOI:

https://doi.org/10.36253/ijam-2334

Keywords:

water resources management, watershed deficit, soil water balance, actual evapotranspiration, deep percolation

Abstract

The aim of the research was to develop a model that would allow the application, at a watershed scale, of the hydrological soil water balance model proposed by the FAO for the dosing of irrigation water in agriculture, which uses crop coefficients (Kc) for the calculation of potential crop evapotranspiration (ETc). To be able to assess the water resources of a territory in which there are land uses other than agricultural ones, the application of the proposed model has made it necessary to determine the crop coefficients of the latter. Since crop coefficients vary according to phenological stage, this model was termed ‘phenological soil water balance’. A correction factor for precipitation and potential evapotranspiration, using an acclivity coefficient (i.e., the ratio between the actual area and the projected area), has also been proposed to obtain accurate results even in non-flat areas, which allowed us to consider the actual area of the territory instead of the projected one. The model was applied daily for 7 consecutive years (from 2013 to 2019) in the Santa Maria degli Angeli watershed (Urbino, central Italy) whose area is about 14 km2. The calibration and validation of the model were conducted by comparing the deep percolation computed by the model with baseflow values of the Santa Maria degli Angeli stream obtained by flow measurements made at the closing section of the sample watershed. The results of the model showed that the total values of deep percolation and measured baseflow only differed by 3% in the whole period considered; thus the phenological soil water balance model can be used to accurately estimate water resources and can be applied at different time intervals (daily, monthly, annual, etc.). The structure of the model makes it suitable for application in both small and large watersheds and territories.

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Published

2024-08-26

How to Cite

Bartolucci, M., & Veneri, F. (2024). The phenological soil water balance: a proposed model for estimating water resources for an entire watershed using crop coefficients. Italian Journal of Agrometeorology, (1), 17–48. https://doi.org/10.36253/ijam-2334

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No. 1 (2024)

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RESEARCH ARTICLES

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Copyright (c) 2024 Michele Bartolucci, Francesco Veneri

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