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在“人民长江”1956年9月号上及今年5月召开的长江水情预报技术交流会上,都提出了对“洪水预报方法”中第4、4、2节由入流合轴相关图推求出流过程的(?)河横排头到六安的合轴相关图[见“洪水预报方法”图(八十七)]的讨论意见,并引用了由分析法(即马司京干法)推得的出流演进公式作为对入流合轴相关图进行合理性检查的基础,从而获得一些论点,认为在这种合轴相关图上应该是两组平行等距的真线。关于这个问题,现提出一些个人意见和同志们讨论,希给予批评与指正。首先要谈谈图算法与合轴相关图解法的区别问题。图算法属于近似计算的范畴,其目的在于推求几个变数之间的函数关系。例如用入流演进公式:D_2=C_0I_2+C_1I_1+C_2D_1作图,就是图算法。因为在这个公式中,D_3=f(I_1、I_2、I_3)即D_3与I_1、I_2及I_3都是线性关系而C_0、C_1、C_2又为常数值,这
In the “People’s Yangtze River” in September 1956 and held in May this year, the Yangtze River hydrological forecasting technology exchange meeting, have proposed the “flood forecasting method” section 4,4,2 by the inflow of shaft-related map push (See the “Flood Forecasting Method” (Figure 87)] for the discussion of the coupled axis of the river from Hengtai to Lu’an (c. ) Derived push flow evolution formula as a basis for the rationality of the inlet and outlet co-axis correlation diagram to get some arguments that in this co-axis correlation diagram should be two sets of parallel isometric real line. On this issue, I have put forward some personal opinions and comrades to discuss it and I hope that it will be criticized and corrected. First of all, we should talk about the difference between graph algorithm and co-axis related graph method. The graph algorithm belongs to the category of approximate computation, and its purpose is to deduce the functional relationship between several variables. For example, with the inflow evolution formula: D_2 = C_0I_2 + C_1I_1 + C_2D_1 mapping, is the graph algorithm. Because in this formula, D_3 = f (I_1, I_2, I_3) that D_3 and I_1, I_2 and I_3 are linear relationship and C_0, C_1, C_2 and constant values, which