Priestley-Taylor模型在浮球覆盖下水面蒸发量估算中的应用  

Application of Priestley-Taylor Model in the Estimation of Water Surface Evaporation Covered by Spheres

作　　者：韩克武 侍克斌[1] 严新军[1] 蒋中明[2,3] 雷鹏 欧阳君[4] HAN Kewu;SHI Kebin;YAN Xinjun;JIANG Zhongming;LEI Peng;OUYANG Jun(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China;School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,China;Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province,Changsha 410114,China;Hunan Water Resources and Hydropower Survey,Design,Planning and Research,Changsha 410114,China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]长沙理工大学水利与环境工程学院,湖南长沙410114 [3]水沙科学与水灾害防治湖南省重点实验室,湖南长沙410114 [4]湖南省水利水电勘测设计规划研究总院有限公司,湖南长沙410114

出　　处：《应用基础与工程科学学报》2024年第2期479-487,共9页Journal of Basic Science and Engineering

基　　金：湖南省教育厅优秀青年项目(22B0309);校企合作项目(20230472);新疆水利科技专项(T201801)。

摘　　要：针对漂浮覆盖下干旱区平原水库防蒸发节水效果的评估问题,采用Priestley-Taylor(P-T)模型对浮球覆盖下水面蒸发量进行估算.结合完整非冰冻期内浮球覆盖下整体表面能量平衡组分变化权重,通过以下两种方法计算P-T模型系数α:(1)引入波文比β建立P-T模型系数α_1的计算公式;(2)以P-T模型中辐射项为自变量,实测水面蒸发量对应的潜热通量为因变量,通过线性拟合法得出P-T模型系数α_2值.根据波文比β和系数α的月际变化特征,在完整非冰冻期、单数月、双数月3种时间尺度下,对应用于P-T模型的估算效果进行分析.结果表明:P-T模型可较好地估算浮球覆盖下的水面蒸发量,而且系数α_2(0.42~0.44)对应的P-T模型模拟效果优于系数α_1(0.39~0.60)对应的P-T模型模拟效果.该研究结论对科学评价浮球覆盖下干旱区平原水库防蒸发节水效果具有参考价值.To solve the evaluating problem of the water surface evaporation under the coverage of spheres,the P-T model coefficientαis calculated by the following two methods,based on the weights of changes in the overall surface energy balance components covered by spheres during the complete non-freezing period.(1)Bowen ratioβis introduced to establish the calculation formula of the P-T coefficientαi;(2)the P-T coefficientα,is obtained by the linear fitting method across the origin,which taking the radiation term in the P-T formula as the independent variable,and the latent heat flux corresponding to the measured water surface evaporation as the dependent variable.According to the monthly change trend of Bowen ratioβand coefficientαduring the complete non-freezing period,the P-T model applied to the estimation effect of the water surface evaporation under the coverage of spheres was evaluated in the complete non-freezing period,odd months,and even months.The results show that the P-T model can better estimate the evaporation of the water surface covered by spheres,and the simulation effect of the P-T model corresponding to the coefficientα,(0.42~0.44)is better than the simulation effect of the P-T model corresponding to the coefficient a,(0.39~0.60).The conclusions of this study have reference value for scientific evaluation of evaporation prevention and water saving effect of plain reservoirs in arid areas covered by spheres.

关 键 词：Priestley-Taylor 能量平衡 波文比 辐射项 蒸发 浮球 

分 类 号：TV697[水利工程—水利水电工程]