自全国水文地质勘察规范(初稿)中推荐用非稳定抽水试验的拐点法求参数以来,有的单位正在使用。在试用过程中遇到一些问题。其中一个主要问题是抽水试验所测得之s-lgt曲线时常和理论上的s-lgt曲线有较大差别。当利用拐点法计算水文地质参数时,拐点很难确定,有时可以得出好几个拐点。给计算工作带来很大困难。因此,往往引起对越层补给的拐点法理论产生怀疑。根据我们对理论的分析与实践的验证,在抽水进行不太长的时间内(相邻补给层未出现明显水位下降或疏干时),越层补给理论与实际情况极为近似。故将该理论用于测定水文地质参数完全可行。但在具体应用时,必须注意 Since the National Institute of Hydrogeological Investigations (first draft) recommended the use of the inflection point method for non-steady pumping tests to determine parameters, some units are in use. Some problems were encountered during the trial process. One of the main problems is that the s-lgt curve measured by the pumping test is often quite different from the theoretical s-lgt curve. When using the inflection point method to calculate hydrogeological parameters, the inflection point is difficult to determine, and sometimes several inflection points can be obtained. It has brought great difficulties to the calculation work. Therefore, it often causes skepticism about the inflection point theory of the replenishment. According to our theoretical analysis and practical verification, when the pumping process is not carried out for a long period of time (with no obvious water level drop or draining in the adjacent recharge layer), the theory of the layer recharge is very similar to the actual situation. Therefore, it is completely feasible to use this theory for the determination of hydrogeological parameters. But in the specific application, it must be noted