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为了了解官厅水庫修建后,永定河下游河道的变化情况、变化原因及其規律,給多沙游蕩河流特別是黄河的整治提供資料,自1956年起在永定河下游进行河道观測研究。这时,官厅水庫起作用已有三年了,芦沟桥附近河床已刷深不少,护岸工程基础露出,滩地坍失,防汛困难很大。考查这些新情况,以安排永定河本身的整治問題,則是观測研究工作的一个更重要的目的。1958年冬起,开始进行河道整治,观測工作也加多了一項目的和內容。
In order to understand the changes of the lower reaches of the Yongding River after the completion of the Guanting Reservoir and the causes and laws of the changes, the paper provides information on the regulation of the wandering wandering rivers, especially the Yellow River. Since 1956, the riverway observation has been carried out in the lower reaches of the Yongding River. At this time, Guanting Reservoir has been in operation for three years. The riverbed near the Lugou Bridge has been brushed a lot and the basal revetment project has been exposed. The collapse of the beachland has caused great difficulties in flood control. Examining these new circumstances to arrange for rectification of the Yongding River itself is a more important objective of observational research. Since the winter of 1958, the river regulation began, and an additional purpose and content have been added to the observation work.