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Position: Home > Articles > Study on ET_0 Calculation Method Considering the Terrain Effect on Temperature Water Saving Irrigation 2016 (8) 157-161+165

考虑地形对气温影响的ET_0计算方法研究

作  者：
高晓丽;徐俊增;缴锡云;王卫光;杨士红;熊玉江
单  位：
河海大学水利水电学院;河海大学水文水资源与水利工程科学国家重点实验室
关键词：
坡度;坡向;气温;参考作物需水量;贵州省
摘  要：
局部地形因子的剧烈变化对气温的影响会进一步影响参考作物需水量(ET0)的精确估算。以贵州省为例开展地形对气温影响下的ET0计算方法,采用符号回归的方法,构建Modis实测气温值与经度、纬度、海拔、坡度、坡向等地形因子以及插值气温之间的函数关系,并将其代入FAO56PM公式,进而得到考虑地形对气温影响的ET0计算方法。研究结果表明,计算所得的气温与Modis气温实测值之间的相关系数均大于0.49,可以有效减小气温的估算误差,具有较好的模拟效果;考虑地形对气温影响的ET0与传统插值方法所得的贵州省内日ET0空间分布特征相一致且较为连续;考虑地形对气温影响下南坡上的ET0大于北坡,且ET0随坡度的增加而减小,当坡度大于60°时,坡度对ET0的影响不容忽视。研究结果可为贵州地区农业精准灌溉和灌区水资源精准配置提供指导依据。
译  名：
Study on ET_0 Calculation Method Considering the Terrain Effect on Temperature
作  者：
GAO Xiao-li;XU Jun-zeng;JIAO Xi-yun;WANG Wei-guang;YANG Shi-hong;XIONG Yu-jiang;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University;College of Water Conservancy and Hydropower Engineering,Hohai University;
关键词：
slope;;aspect;;temperature;;reference evapotranspiration;;Guizhou Province
摘  要：
Effect of dramatic changes in local terrain factors on temperatures will further affect the accurate estimation of reference evapotranspiration(ET0).The calculation method of ET0 under the influence of temperature affected by terrain factors was conducted with a case study in Guizhou province.The function of measured modis temperature and topographical factors as longitude,latitude,elevation,slope and aspect was constructed using symbolic regression method.After the constructed temperature calculation method was substituted into FAO-56 Penman Monteith,the calculation method of ET0 under the influence of temperature affected by terrain factors was obtained.The results showed that the correlation coefficient between computed temperature and measured temperature was 0.721 2.The function of temperature can reduce the estimation error effectively,which have a good simulation result.The ET0 considering the terrain effect and using the traditional interpolation method displayed the similar and consistent spatial distributed characteristic.In addition,the ET0 in southern slope was higher than the result in northern slope and ET0 decreases with increasing slope.When the slope was over 60°,the effect of slope on ET0 can not be ignored.The research results can provide a guidance basis for agriculture precision irrigation and optimize allocating of water resource.

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