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天然河道水面线计算是水利规划设计中工作量较大的课题,这一课题实行电算,选用机型和算法众目繁多。由于微型电脑PC-1500在功能及其容量都优于Fx-702P和TI-59等可编程序电算器,本文仅介绍PC-1500电算在推算河道水面线中的程序(BA-SIC语言),该程序设计采用三点抛物插值试算法,它可直接根据测量数据(距离x和水位y)推算Y-K(输水系数)曲线;并可推求天然河道的汇流;分汊情况时的水面线以及反算糙率。本文末尾附有鄱阳湖赣江尾闾整治研究中,河洪20年一遇(1982年洪水)第一方案(现状,由实测水面线反推糙率)及第四方案推算水面线的电算成果表。
Natural river surface water line calculation is a large workload in water conservancy planning and design issues, the implementation of computer computing, selection of models and algorithms numerous. Since PC-1500 is superior to both Fx-702P and TI-59 in terms of function and capacity, this article describes only the PC-1500 program for estimating waterline in the river (BA-SIC language ), The program uses a three-point parabolic interpolation trial algorithm that directly estimates the YK (water transfer coefficient) curve based on the measured data (distance x and water level y), as well as the confluence of natural rivers, And the inverse roughness. At the end of this paper, the first plan (status quo, inverse roughness of measured water line) and the calculation results of the water surface in the fourth scheme table.