Management of irrigation water in Al-Baha Region, Saudi Arabia using simple and alternative equation to Penman-Monteith equation

IF 1.1 4区工程技术 Q3 ENGINEERING, CIVIL Proceedings of the Institution of Civil Engineers-Water Management Pub Date : 2023-07-03 DOI:10.1680/jwama.23.00012

Khalid Alkhuzai

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Abstract

Estimation of reference crop evapotranspiration (ETo) is very important in planning and scheduling irrigation water. An estimation of ETo by other simple methods is necessary with the loss of one or more meteorological factors required for estimation by the Penmen-Monteith equation. So, the aim of the study was to manage irrigation water in the Al-Baha region of Saudi Arabia using a simple equation to estimate ETo based on air temperature and an effective alternative to the Penmen-Monteith equation (PM). Four simple temperature dependent equations, Thornthwaite, Blaney-Criddle, Hamon and Linacre were selected. The results showed that the Linacre method is the best equation for estimating ETo and although the ETo rate was overestimated based on the Linacre equation compared to PM, it had the lowest error percentage (9.55%) in addition to the highest R2 (0.97). After deducing a new and accurate equation based on the Linacre equation and its high ability to estimate the ETo rate and give it values closest to the results obtained using PM in the Al-Baha region in Saudi Arabia, it can be relied upon to estimate the irrigation needs in the Al-Baha region with irrigation systems used in this region.

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利用Penman-Monteith方程的简单替代方程对沙特阿拉伯Al-Baha地区灌溉水的管理

参考作物蒸散量的估算对灌溉用水的规划和调度具有重要意义。由于Penmen-Monteith方程需要损失一个或多个气象因子，因此需要用其他简单方法估计ETo。因此，该研究的目的是使用一个简单的方程来估计基于气温的ETo，并使用一个有效的替代Penmen-Monteith方程(PM)来管理沙特阿拉伯Al-Baha地区的灌溉用水。选择了四个简单的温度相关方程:Thornthwaite、Blaney-Criddle、Hamon和Linacre。结果表明，Linacre法是估计ETo的最佳方程，尽管Linacre法的ETo率与PM相比存在高估，但其误差率最低(9.55%)，R2最高(0.97)。在Linacre方程的基础上推导出一个新的、准确的方程，该方程具有较高的估计ETo率的能力，并给出了最接近于沙特阿拉伯Al-Baha地区使用PM获得的结果的值，可以依靠该方程来估计该地区使用灌溉系统的灌溉需求。

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来源期刊

Proceedings of the Institution of Civil Engineers-Water Management 工程技术-工程：土木

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Water Management publishes papers on all aspects of water treatment, water supply, river, wetland and catchment management, inland waterways and urban regeneration. Topics covered: applied fluid dynamics and water (including supply, treatment and sewerage) and river engineering; together with the increasingly important fields of wetland and catchment management, groundwater and contaminated land, waterfront development and urban regeneration. The scope also covers hydroinformatics tools, risk and uncertainty methods, as well as environmental, social and economic issues relating to sustainable development.