中文摘要：

在全面介绍逻辑树方法的原理及水尺计重方法的基础上,将“问题树”作为基本构造框架,经过逐层分析,找到影响水尺计重误差的所有相关问题,并据此建立水尺计重误差逻辑树.根据各类误差的定义,对26种误差源进行分类,并结合水尺计重算法分析各类误差的修正方法.在水尺计重的众多误差源中,甄别出水流导致的船体下沉造成的误差尚未得到修正.该误差属于系统误差,理应通过改进测量方法或增加修正量予以消减.

英文摘要：

Based on the comprehensive introduction of logic tree and the method of draft survey, using ＇ problem tree＇ as the basic framework, through analysis step by step, this paper identifies all related factors affecting the draft survey errors, and establishes the logic tree of draft survey errors. 26 kinds of error sources are defined, and correction of them is analyzed according to the draft survey algorithm. The analysis reveals that the system error caused by the squat due to water flow is not corrected, which requires additional correction term or new measuring method to improve.