基于Blaney-Criddle方法估算潜在蒸散量的评价与校准
发布时间：2019-07-24 08:14
【摘要】：为提高Blaney-Criddle(BC)方法在陕西关中地区的估算精度,以Penman方法(PE)为标准,利用1960—1999年陕西关中地区6个站点逐日资料对BC方法进行适用性评价和参数修正,并使用2000—2015年资料对修正的BC方法进行验证,得到基于温度的潜在蒸散量估算方法(CBC方法)。结果表明:BC方法计算的月均ETp(潜在蒸散量)在温度较低时低估,在温度较高时高估。通过改进后,CBC与PE方法计算的月均ETp回归曲线的斜率更接近于1(改进前0.685,改进后0.999 7)。与PE方法的计算结果相比,改进后BC(CBC)计算月均ETp相对误差由-18.022%~16.269%变为1.290%~3.630%,均方根误差由0.529~0.921 mm/d降为0.214~0.283 mm/d;平均偏差由-0.063~0.601 mm/d变为-0.001 121~0.000 737 mm/d。修正前后BC方法计算月均ETp值与PE方法计算值拟合的决定系数由0.942提高到0.966。通过年累计ETp和年内月累计ETp的验证,CBC与PE计算的ETp变化趋势和数值更为接近。综合分析表明,CBC方法能够显著提高潜在蒸散量的计算精度(ETp),可以应用于陕西关中地区ETp的计算。
[Abstract]:In order to improve the estimation accuracy of Blaney-Criddle (BC) method in Guanzhong area of Shaanxi Province, taking Penman method (PE) as the standard, the applicability evaluation and parameter correction of BC method are carried out by using the daily data of 6 stations in Guanzhong area of Shaanxi Province from 1960 to 1999, and the modified BC method is verified by using 2000-2015 data, and the potential evaporation estimation method based on temperature (CBC method) is obtained. The results show that the monthly average ETp calculated by BC method is underestimated at low temperature and overestimated at high temperature. After the improvement, the slope of the monthly mean ETp regression curve calculated by CBC and PE method is closer to 1 (0.685 before improvement and 0.999 7 after improvement). Compared with the calculation results of PE method, the relative error of monthly average ETp calculated by improved BC (CBC) is from-18.022% 鈮，
本文编号：2518510
[Abstract]:In order to improve the estimation accuracy of Blaney-Criddle (BC) method in Guanzhong area of Shaanxi Province, taking Penman method (PE) as the standard, the applicability evaluation and parameter correction of BC method are carried out by using the daily data of 6 stations in Guanzhong area of Shaanxi Province from 1960 to 1999, and the modified BC method is verified by using 2000-2015 data, and the potential evaporation estimation method based on temperature (CBC method) is obtained. The results show that the monthly average ETp calculated by BC method is underestimated at low temperature and overestimated at high temperature. After the improvement, the slope of the monthly mean ETp regression curve calculated by CBC and PE method is closer to 1 (0.685 before improvement and 0.999 7 after improvement). Compared with the calculation results of PE method, the relative error of monthly average ETp calculated by improved BC (CBC) is from-18.022% 鈮，
本文编号：2518510
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