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在地下水资源计算中,常用降雨量和观测孔水位动态资料求降雨渗入系数(α),而应用此法的关健在于水位天然平均降速(△h)的取值。传统的方法系以降雨前期t_0日内水位天然平均降速(△h)来代替降雨时段内的水位天然平均降速(△h)的,其实质认为△h与水位的上升无关,即△h≈△h。但经本人的实验和反复实践证明,传统方法求取的△h与实际误差较大,导致计算的α值偏小,不宜采用。因为无论在实验中,或是在自然状态下,实际上△h总是随着水位标高的变化而变的,即水位标高愈大则△h愈大,反之则反,均与传统认识相违,因此本文提出在观测孔水位动态曲线上用水位标高类比法来求取△h,可能比传统方法更为接近实际,且方法简单。
In the calculation of groundwater resources, the rainfall infiltration coefficient (α) is often used for the rainfall and observation hole water level dynamic data. The key point of applying this method lies in the value of the natural average water drop (Δh). The traditional method replaces the natural mean drop (Δh) of water level during the rainy season with the mean decrease (△ h) of the domestic water level at the t0 day before the rainfall, which is irrelevant to the rise of the water level, that is, Δh≈ △ h. However, after my own experiments and repeated practice, it has been proved that the △ h and the actual error obtained by the traditional method are relatively large, which leads to the calculated value of α being too small and should not be used. Because in both experiments, or in the natural state, in fact, △ h always changes with the elevation of the water level changes, that is, the greater the water level elevation, the greater △ h, on the contrary, contrary to the traditional understanding of the contrary Therefore, this paper proposes to find △ h by the water level height analogy on the dynamic curve of observation hole water level, which may be more realistic than the traditional method, and the method is simple.