前言繪制控制曲綫法在恩·馬·别尔那茨基著的“河流水力学及其理論和方法”一書(莫斯科、列寧格勒、1933年版)中已作了闡明,为了要熟悉問題的理論方面就应該重視此書。在本文中我們的目的是对繪制控制曲綫給与实踐的指示,并以控制曲綫为依据來繪制無冰河床的自由水面曲线。为此,可根据水文观测資料 Preface The method of plotting control curves has been explained in the book Entropy of Rivers and its Theory and Method by Enmat Berniercki (Leningrad, Moscow, 1933), in order to be familiar with the problem Theory should pay attention to this book. In this paper, we aim to give an indication of the practice of drawing control curves and to plot the free-surface curves of an ice-free river bed based on control curves. To this end, according to hydrological observations