随机地下水非平稳谱方法  

A nonstationary method for stochastic groundwater

作　　者：李连侠[1] 廖华胜[1] 刘达[1,2,3] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,成都610065 [2]广东省水利水电科学研究院,广州510610 [3]广东省水动力学应用研究重点实验室,广州510610

出　　处：《中国科技论文》2012年第5期382-387,394,共7页China Sciencepaper

基　　金：高等学校博士点专项科研基金资助项目(20090181120013);国家自然科学基金资助项目(51079091)

摘　　要：从一般的随机地下水模型出发,逐步给出了基于傅里叶变换的非平稳谱方法控制方程的建立过程。基于该框架的模型可以很好地处理实际地下水运动的非平稳性和随机性,给出了随机模拟最为关心的各阶距的求解方法,该方法采用半解析半数值技术,对高频部分采用解析方法,对低频部分采用数值方法,既提高了精度又减小了计算量。Based on the general stochastic groundwater governing equation, the complete nonstationary spectral stochastic model is deduced step by step, which can deal with the complicated heterogeneous and nonstationary properties of large-scale groundwater movement due to the complex structure and component of the stratum. Finally, an approach to compute the moments of the most concern to stochastic groundwater simulation is introduced by combining theoretical and numerical methods. The theoretical techniques are used to handle the item with high frequency and the numerical techniques are used to simulate the item with low frequency.

关 键 词：随机地下水 变异性 水力传导系数 非平稳谱方法 

分 类 号：P641.2[天文地球—地质矿产勘探]