In order to derive this equation , one has to assume no spatial variability in k , f and n , to neglect the effect of capillary rise above the groundwater table , and to invoke the dupuit - forcheimer approximation , which states that the hydraulic head is independent of depth 图1潜水面的示意图为了利用dupuit - forcheimer假设推导出以上的方程,必须假设k , f以及n t在整个潜水面上的空间不变性,同时忽略潜水面上的水分的毛细运动
空间: space; enclosure; room; blan ...不变性: invariance; invariance prope ...空间不变性条件: space invariability condition时间不变性: tine invariance空间不变: space invariance空间不变系统: spatial invariant system; spatially invariant system时间不变性运算: time invariant operation线性空间不变系统: linear spatially invariant system线性空间不变光学系统: linear space-invariatn optical system还采取了时间不变性投资组合保护策略: tipp时间不变的: invariant in time不变性: invariance; invariance property; constantness◇不变性原理 invariance principle不变,不变性: immutability空间不足: low hd space时间不变系统: time-invariant system不变, 不变性, 安定性: invariability不变性不变式: invariance磁盘空间不够: insuffvient disk space磁盘空间不足: insufficient disk space; out of disk space堆栈空间不足: insufficienft stack space空间不均匀性: spatial non uniformity; spatial nonuniformity空间不相关的: space-independent内存空间不够: insuffvient memorc不变性: c invariance变换不变性: invariance under transformation