Spatio-Temporal Trend Analysis of Reference Evapotranspiration in Central Luzon, Philippines

Q3 Multidisciplinary Philippine Journal of Science Pub Date : 2023-05-03 DOI:10.56899/152.s1.03
L. Caguiat, R. Saludes, M. Castro, R. Lampayan
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引用次数: 1

Abstract

Understanding trends in reference evapotranspiration (ETₒ) and their influencing factors is crucial for calculations of irrigation requirements and water management. Meteorological data in Central Luzon (1985–2019) were used to estimate ETₒ using the FAO Penman-Monteith method. Spatial and temporal ETₒ trends were analyzed using the Mann-Kendall test and Sen’s slope estimator. Correlation and sensitivity analyses were conducted to analyze the impact of weather variables on ETₒ. Positive correlations were observed for maximum temperature, solar radiation, and wind speed whereas negative correlations were observed for relative humidity and minimum temperature. In general, ETₒ was statistically dependent and most sensitive to solar radiation, maximum temperature, and relative humidity. ETₒ in the stations surrounded by mountains was consistently lower than the stations in the agricultural areas by 197 and 207 mm for the dry season and annual basis, respectively. The increasing trends with a magnitude of 3.98 mm/yr in annual ETₒ were caused by the rising trend in solar radiation and maximum temperature and a decreasing trend in relative humidity. The decreasing ETₒ trend (–2.6 to –4.63 mm/yr) predominant in the study area was mainly attributed to the decreasing trend of solar radiation and wind speed. Areas with increasing ETₒ trends indicate the need for supplemental irrigation. Decreasing ETₒ trends may indicate climate change, land-use change, or human-related factors.
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菲律宾吕宋岛中部参考蒸散量时空趋势分析
了解参考蒸散趋势(ETₒ)及其影响因素对于计算灌溉需求和水管理至关重要。利用1985-2019年吕宋岛中部的气象数据,采用粮农组织Penman-Monteith方法估算ETₒ。利用Mann-Kendall检验和Sen 's斜率估计分析时空ETₒ趋势。通过相关分析和敏感性分析分析天气变量对ET的影响ₒ。最高温度、太阳辐射和风速呈正相关,而相对湿度和最低温度呈负相关。总的来说,ETₒ在统计上依赖于太阳辐射、最高温度和相对湿度,并且对其最敏感。在旱季和年基础上,山地站的ETₒ分别比农业区站低197和207 mm。年ETₒ增加幅度为3.98 mm/yr,主要是由于太阳辐射和最高温度的增加和相对湿度的减少。研究区ET的减少ₒ趋势(-2.6 ~ -4.63 mm/yr)主要归因于太阳辐射和风速的减少趋势。ET增加ₒ趋势的地区表明需要补充灌溉。ET降低ₒ趋势可能表明气候变化、土地利用变化或与人类有关的因素。
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来源期刊
Philippine Journal of Science
Philippine Journal of Science Multidisciplinary-Multidisciplinary
CiteScore
1.20
自引率
0.00%
发文量
55
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