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《供水水文地质手册》第二册在“潜水完整井非稳定抽水确定水文地质参数”一节中,对直线解析法原理阐述的图形表示和实例应用的计算,均直接采用teα表示直线的斜率和进行实例运算(参见《供水水文地质手册》第二册114页至117页)。在单对数直角坐标系中,直线的斜率不应等于tgα。根据几何学中直线的点斜式方程可知,直线的斜率用直线上任意点的坐标计算为:
In the second volume of “Handbook of Water Supply Hydrogeology”, in the section of “Determining Hydrogeological Parameters by Unsteady Pumping in Complete Well”, the graphic representation and example application of the principle of straight line analysis are directly expressed by teα, Perform an example calculation (see Handbook for Water Supply Hydrogeology, Volume II, pages 114 to 117). In a single logarithmic rectangular coordinate system, the slope of the straight line should not be equal to tgα. According to the geometric point of the straight line equation, the slope of the straight line with any point on the coordinates calculated as: