發(fā)布時(shí)間：2019-07-24 08:14

【摘要】：為提高Blaney-Criddle(BC)方法在陜西關(guān)中地區(qū)的估算精度,以Penman方法(PE)為標(biāo)準(zhǔn),利用1960—1999年陜西關(guān)中地區(qū)6個(gè)站點(diǎn)逐日資料對(duì)BC方法進(jìn)行適用性評(píng)價(jià)和參數(shù)修正,并使用2000—2015年資料對(duì)修正的BC方法進(jìn)行驗(yàn)證,得到基于溫度的潛在蒸散量估算方法(CBC方法)。結(jié)果表明:BC方法計(jì)算的月均ETp(潛在蒸散量)在溫度較低時(shí)低估,在溫度較高時(shí)高估。通過(guò)改進(jìn)后,CBC與PE方法計(jì)算的月均ETp回歸曲線(xiàn)的斜率更接近于1(改進(jìn)前0.685,改進(jìn)后0.999 7)。與PE方法的計(jì)算結(jié)果相比,改進(jìn)后BC(CBC)計(jì)算月均ETp相對(duì)誤差由-18.022%~16.269%變?yōu)?.290%~3.630%,均方根誤差由0.529~0.921 mm/d降為0.214~0.283 mm/d;平均偏差由-0.063~0.601 mm/d變?yōu)?0.001 121~0.000 737 mm/d。修正前后BC方法計(jì)算月均ETp值與PE方法計(jì)算值擬合的決定系數(shù)由0.942提高到0.966。通過(guò)年累計(jì)ETp和年內(nèi)月累計(jì)ETp的驗(yàn)證,CBC與PE計(jì)算的ETp變化趨勢(shì)和數(shù)值更為接近。綜合分析表明,CBC方法能夠顯著提高潛在蒸散量的計(jì)算精度(ETp),可以應(yīng)用于陜西關(guān)中地區(qū)ETp的計(jì)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，

本文編號(hào)：2518510