Evaluation of Remote Sensing-Based Irrigation Water Accounting at River Basin District Management Scale

Author:

Garrido-Rubio JesúsORCID,Calera AlfonsoORCID,Arellano Irene,Belmonte Mario,Fraile Lorena,Ortega Tatiana,Bravo Raquel,González-Piqueras JoséORCID

Abstract

The Water Framework Directive in Europe requires extending metering and water abstraction controls to accurately satisfy the necessary water resource requirements. However, in situ measurement instruments are inappropriate for large irrigation surface areas, considering the high investment and maintenance service costs. In this study, Remote Sensing-based Irrigation Water Accounting (RS-IWA) (previously evaluated for commercial plots, water user associations, and groundwater water management scales) was applied to over 11 Spanish river basin districts during the period of 2014–2018. Using the FAO56 methodology and incorporating remote sensing basal crop coefficient time series to simulate the Remote Sensing-based Soil Water Balance (RS-SWB), we were able to provide spatially and temporally distributed net irrigation requirements. The results were evaluated against the irrigation water demands estimated by the Hydrological Planning Offices and published in the River Basin Management Plans applying the same spatial (Agricultural Demand Units and Exploitation Systems) and temporal (annual and monthly) water management scales used by these public water managers, ultimately returning ranges of agreement (r2 and dr) (Willmott refined index) of 0.79 and 0.99, respectively. Thus, this paper presents an operational tool for providing updated spatio-temporal maps of RS-IWA over large and diverse irrigation surface areas, which is ready to serve as a complementary irrigation water monitoring and management tool.

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

Reference107 articles.

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2. EEA Water Resources across Europe—Confronting Water Scarcity and Drought—European Environment Agencyhttps://www.eea.europa.eu/publications/water-resources-across-europe

3. Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 Establishing a Framework for Community Action in the Field of Water Policy,2000

4. Introduction to the EU Water Framework Directive—Environment—European Commissionhttps://ec.europa.eu/environment/water/water-framework/info/intro_en.htm

5. European Overview—Second River Basin Management Plans 5th Implementation Report,2019

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