摘要
蒸散发是水资源平衡的关键组成部分,准确估算蒸散发对于水资源的合理分配和利用至关重要。为深入认识鄱阳湖区潜在蒸散发(ET_(0))特性及不同ET_(0)估算公式在该区域的适用性,基于1961~2019年鄱阳气象站逐日气象资料,以FAO 56 Penman-Monteith法计算的多年ET_(0)作为标准值研究鄱阳湖区ET_(0)的时间变化特征,并从不同尺度对比了3种综合法、4种辐射法和2种温度法在该区域的适用性,此外采用通径分析探讨了ET_(0)的变化成因。结果表明:①1961~2019年鄱阳湖区多年ET_(0)均值为974.49 mm,呈不显著下降趋势(-2.68 mm/10 a),与多年显著升温趋势共同验证了该地区存在“蒸发悖论”现象;②综合法在该地区适用性最好,辐射法次之,其中Makkink和FAO 24 Penman法适用性最好,Mc Cloud法适用性最差;③5个气象因子对ET_(0)影响程度排序为净辐射>平均温度>日照时数>饱和水汽压差>2 m高度平均风速,净辐射是影响该区域ET_(0)变化最主要的气象因子,其次是温度。研究成果可为鄱阳湖区水资源合理配置与调控提供科学依据。
Evapotranspiration is a key component of water resource balance,and accurately estimating evapotranspiration is crucial for rational allocation and utilization of water resources.To gain a deeper understanding on the potential evapotranspiration(ET0)characteristics in Poyang Lake area and the applicability of different ET0 estimation formulas in this region,based on daily meteorological data from the Poyang meteorological station(from 1961 to 2019),we used the multi-year ET0 calculated by the FAO 56 Penman-Monteith method as the reference value to study the temporal variation of ET0 in Poyang Lake area.Additionally,we assessed the applicability of three combination methods,four radiation-based methods,and two temperature-based methods across various scales.Furthermore,path analysis was employed to explore the causes of ET0 variation.The results showed that:①Over the past 59 years,the average annual ET0 value in the lake area was 974.49 mm,exhibiting a non-significant downward trend(-2.68 mm/10 a),together along with the significant warming trend,which confirms the presence of the"evaporation paradox"phenomenon in this region.②The combination methods showed the best applicability in the region,followed by the radiation-based methods.Among the radiation-based methods,the Makkink and FAO 24 Penman methods had the best applicability,while the Mc Cloud method showed the worst applicability.③The five meteorological factors were ranked in a descending order of their influence on ET0 as follows:net radiation>mean temperature>sunshine duration>vapor pressure deficit>mean wind speed at 2 m height.Net radiation was the most essential meteorological factor influencing ET0 variation in the region,followed by temperature.This study provides scientific evidence for the rational allocation and regulation of water resources in Poyang Lake region.
作者
万珊珊
刘卫林
周展雄
殷彪彪
何少华
欧阳千林
WAN Shanshan;LIU Weilin;ZHOU Zhanxiong;YIN Biaobiao;HE Shaohua;OUYANG Qianlin(Key Laboratory of Jiangxi Provincial Water Resources Allocation and Efficient Utilization,Jiangxi University of Water Resources and Electric Power,Nanchang 330099,China;Poyang Lake Hydrology and Water Resources Monitoring Center,Nanchang 330002,China;Jiangxi Hydrological Monitoring Center,Nanchang 330002,China)
出处
《人民长江》
北大核心
2025年第8期91-98,115,共9页
Yangtze River
基金
国家自然科学基金项目(52069015)
江西省水利厅科技项目(202425YBKT13)。
关键词
潜在蒸散发
气象因子
适用性评估
通径分析
鄱阳湖
potential evapotranspiration
meteorological element
applicability evaluation
path analysis
Poyang Lake
作者简介
万珊珊,女,硕士研究生,主要从事水文水资源研究。E-mail:eilene0112@foxmail.com;通信作者:刘卫林,男,教授,博士,主要从事水文水资源研究。E-mail:weilin_liu@nit.edu.cn。
