罗毅, 杨诗秀, 雷志栋. 潜在腾发量的随机过程特性探讨—— 一个实例研究[J]. 水科学进展, 1998, 9(4): 338-344.
引用本文: 罗毅, 杨诗秀, 雷志栋. 潜在腾发量的随机过程特性探讨—— 一个实例研究[J]. 水科学进展, 1998, 9(4): 338-344.
Luo Yi, Yang Shixiu, Lei Zhidong. Stochastic Characteristics of Potential Evapotrnaspiration——A Case Study[J]. Advances in Water Science, 1998, 9(4): 338-344.
Citation: Luo Yi, Yang Shixiu, Lei Zhidong. Stochastic Characteristics of Potential Evapotrnaspiration——A Case Study[J]. Advances in Water Science, 1998, 9(4): 338-344.

潜在腾发量的随机过程特性探讨—— 一个实例研究

Stochastic Characteristics of Potential Evapotrnaspiration——A Case Study

  • 摘要: 利用中国科学院禹城试验站的系列气象观测资料计算了逐日潜在腾发量(ETP).将日潜在腾发量系列分解为均值项和随机项两个部分,利用标准差对随机项进行了标准化处理.而后着重研究了标准化以后的随机序列的随机过程特征.首先,建立了该系列的离散的时间序列模型,然后在此基础上建立了相应的连续参数的随机模型,取得了该序列的理论概率分布密度和稳态概率分布密度,并得到了观测结果的验证,同时,还得到了该序列的自相关函数和谱密度函数的解析表达式,从而比较全面地分析了腾发量系列的随机过程特性.

     

    Abstract: The serial daily potential evapotranspiration was calculated from meteorological data collected from the Yucheng Comphrensive Experimental Station,Chinese Academy of Sciences.Based on the serial data,normalized ETP series (NETP)were generated with the mean of ETP removed and the residue dimen-sionalized by standard deviation.Furtherly,a discrete AR(1)model was constructed for NETP.On the basis of the discrete AR(1)model,the corresponding continuous parameter model,namely A(1),wasest up and the coefficients invol vedestimated. A(1)is a first order stochastic differential equation.The probability density function,autocorrelation function and spectral density function associated with the A(1) were obtained analytically.

     

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