(一)前言 (1)需要和可能随着国民经济增长的需要,航道部门提出长江宜昌、沙市年最低水位预报的要求。年最低水位的数值和它出现的时间,对航运部门的确是很重要的,因为货运的周转和它的计划准确性与年最低水位有着重要关系;但是它对我们来说,还是一个新的课题,既无先例可循,又受目前技术水平的限制,难以作出较好的方案来,这里初次尝试作了两种预报方法,介绍出来,与同行共同研究。 (1) Preface (1) Necessary and Possible With the needs of national economic growth, the waterway department has put forward the requirements for forecasting the minimum water level in Yichang and Shashi in the Yangtze River. The value of the lowest water level for the year and the timing of its emergence is indeed important to the shipping sector as the flow of freight and the accuracy of its planning have an important bearing on the lowest water level of the year, but it is still a new topic for us , There is no precedent to follow, but also by the current technical limitations, it is difficult to make a better plan, where the first attempt to make two methods of forecasting, introduced, and colleagues to study.