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准确估算流域潜在蒸散发量(PET)具有重要意义。文中基于黑河流域16个国家基本气象站1990～2000年的历史气象数据,利用FAO56-PM法和其它6种基于辐射的PET估算方法,对各站点PET进行估算。以PM法的计算结果作为标准,对6种方法进行参数校正,并对其估算精度进行评价。结果表明:采用初始参数时,Hargreaves法在黑河流域的PET估算精度最高。经过参数校正,Makkink法估算PET的精度最高。因此,在计算黑河流域PET时,推荐使用经过参数校正后的Makkink法。
Accurate estimation of potential evapotranspiration (PET) is of great significance. Based on the historical meteorological data of the basic meteorological stations in 16 countries in the Heihe River basin from 1990 to 2000, the paper uses the FAO56-PM method and six other methods of PET estimation based on radiation to estimate the PET of each site. Taking the calculation results of PM method as a standard, six kinds of methods are calibrated, and their estimation accuracy is evaluated. The results show that the Hargreaves method has the highest PET estimation accuracy in the Heihe River Basin with the initial parameters. After parameter calibration, Makkink method to estimate the highest accuracy of PET. Therefore, when calculating the PET in the Heihe River Basin, we recommend using the Makkink method after parameter correction.