基于Priestley-Taylor模型的低丘红壤区水热通量变化及影响因素  

Research on the Change of Water and Heat Flux and Influencing Factors in Low Hilly Red Soil Region Based on Priestley-Taylor Model

作　　者：姚欢欢 景元书[1] 韩丽娟 YAO Huan-huan;JING Yuan-shu;HAN Li-juan(Collaborative Innovation Center of Meteorological Disaster Forecasting Warning and Assessment,Nanjing University of Information Science and Technology,Nanjing 210044,China;National Meteorological Center,Beijing 100081,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]国家气象中心,北京100081

出　　处：《中国农村水利水电》2020年第9期1-7,15,共8页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(41575111,41175098);第9批“六大人才高峰”高层次人才项目(NY-038)。

摘　　要：Priestley-Taylor参考作物蒸散模型系数的本地化是提高区域蒸散模拟精度的关键。以江西省低丘红壤区农田为研究对象,基于大孔径闪烁仪的观测数据,利用通径分析方法对农田不同时间尺度水热通量特征进行了定量研究。同时,采用Priestley-Taylor模型模拟了红壤区作物蒸散,与实测蒸散进行了比较,并对该模型的系数进行了修正,评价了P-T1.26及P-T1.07模型在本地模拟蒸散的适用性。结果表明,逐日尺度下农田水热通量变化曲线呈单峰形且受天气条件影响明显,逐月尺度下净辐射通量、潜热通量及土壤热通量呈减小的变化趋势;净辐射通量、空气温度及水汽压亏缺是影响潜热通量的主导因子,均对潜热交换有促进作用;P-T1.26模拟的蒸散比实测偏高13.77%,P-T1.07模拟的蒸散比实测偏低3.39%,参数修正后的P-T1.07模型模拟精度明显提高,α=1.07可以作为研究区Priestley-Taylor模型的本地化适宜参数。The localization of Priestley-Taylor reference crop evapotranspiration model coefficients is the key to improving the accuracy of regional evapotranspiration simulation.In this paper,the farmland in the low hilly red soil region of Jiangxi Province is taken as the research object.Based on the observation data of the large aperture scintillator,the water and heat flux characteristics of farmland at different time scales are quantitatively studied by the path analysis method.At the same time,the Priestley-Taylor model is used to simulate the evapotranspiration of the red soil region,and the measured evapotranspiration is compared.The coefficients of the model are modified to evaluate the local evapotranspiration of the P-T1.26 and P-T1.07 model.applicability.The results show that the curve of water-heat flux in farmland is unimodal and is affected by weather conditions on a daily scale.The net radiant flux,latent heat flux and soil heat flux decrease at a monthly scale.Rn,T and VPD are the dominant factors affecting latent heat flux,both of which promote the latent heat exchange.P-T1.26 simulated evapotranspiration is 13.77%higher than the actual measurement,and P-T1.07 simulated evapotranspiration is 3.39%lower than the actual measurement.The P-T1.07 model with modified parameters has a significantly improved simulation accuracy,andα=1.07 can be used as a suitable localization parameter for the Priestley-Taylor model in the study area.

关 键 词：低丘红壤区 大孔径闪烁仪 水热通量 通径分析 Priestley-Taylor系数 

分 类 号：TV93[水利工程—水利水电工程] S15[农业科学—土壤学]