基于数值分析的广域节水灌溉工程对水土保持的影响研究

规模性节水灌溉工程是影响降低我国农业水资源损耗、提高水资源利用率的重要水利工程,同时对区域水土保持工作尤其是地下水位也带来重要的影响。文章将根据新疆某片区大规模、广域型节水工程灌溉项目实例,基于数值分析预测模型,展开了节水灌溉工程对区域地下水位变化规律影响的研究,为区域水土保持工作提供指导。研究发现:①相对于土渠,混凝土节水衬砌渠道具有良好的防渗漏性能,相等水位水力作用下,30d内混凝土渠水的渗透距离仅达到土渠的7.84%,能够起到降低水资源耗费的结果;②数值分析预测模型应用模拟得出水流渗透深度呈指数型增长,相关性系数R2=0.9991,高度符合节水灌溉工程中的实际情况,可以将之推广到其他节水灌溉工程影响研究中。

Application of Extreme Value Theory to Generation and Analysis of Pseudorandom Samples

The article deals with the methodology of pseudorandom data analysis. As a mathematical tool for carrying out the research the extreme value theory was used that creates one of the directions in mathematical statistics, and is related to investigating the extreme deviations from the median values in probability distributions. Also, the methods for estimating unknown parameters and algorithm of random-number generation are discussed. The models of treatment the extreme values are constructed which are based on machine generated sample and approach is proposed for their future application for constructing forecasting models.