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在许多粗粒潜水含水层中,用博尔顿或牛曼推导的解析法求出的给水度都偏小,因而不能用于水资源评价。虽然在博尔顿模型中似乎包括了潜水面以上的延迟给水,但本研究却发现,只有在饱水带中存在着垂向水力梯度才是博尔顿及牛曼模型的共同理论基础。实际上,非饱水带的延迟排水是引起降深-时间曲线发生畸变的因素,这种畸变使曲线解析的渗透系数偏大,而给水度偏小。
In many coarse-grained aquifers, the water-supply rates derived by Bolton or Neumann-derived analytical methods are too small to be used for water resource assessment. Although the Bolton model seems to include delayed water supply above the surface of the submerged surface, the present study found that only the vertical hydraulic gradient in the saturated water zone is the common theoretical basis for the Bolton and Neumann models. In fact, the delayed drainage of non-saturated zone is the factor that causes the deformation of the drawdown-time curve. This distortion causes the permeability coefficient of the curve analysis to be larger and the water supply to be smaller.