论文部分内容阅读
Priestley-Taylor公式是无平流的假设条件下提出的,而实际情况很难满足。为了消除基本假设所带来的计算误差,原公式中引入修正系数α。但大量研究表明,修正系数α具有很大的时空变异性,取值具有很大的不确定性。本文尝试直接引入平流项的方法来反映平流的影响作用。通过在乌江鸭池河流域进行实例验证分析,结果表明该方法具有一定的合理性,能够为冬季蒸散发的计算提供最小能量保证。相比原有的修正系数法,蒸散发的计算精度得到有效提高。特别是原有公式计算出现的冬季偏小、夏季偏大的情况得到了有效的改善。
Priestley-Taylor formula is proposed under the assumption of no advection, and the actual situation is difficult to meet. In order to eliminate the calculation error caused by the basic assumption, the correction coefficient α is introduced into the original formula. However, a large number of studies show that the correction coefficient α has a great spatiotemporal variability and the value has a great deal of uncertainty. This paper tries to introduce the method of advection directly to reflect the effect of advection. The results show that this method has certain rationality and can provide the minimum energy guarantee for the calculation of winter evapotranspiration. Compared with the original correction factor method, the calculation accuracy of evapotranspiration is effectively improved. In particular, the calculation of the original formula of the winter is too small, the summer is too large have been effectively improved.