中文摘要：

蓄滞洪区作为水利工程的重要组成部分，在减轻沿岸大堤的洪水压力等方面起到了重要作用，但同时也造成蓄滞洪区内发生重大灾害。依据灾害系统理论与洪灾形成规律，系统地研究文安洼蓄滞洪区洪水灾害链。研究发现，文安洼蓄滞洪区洪水灾害属于雨一洪灾害链，从洪水蔓延角度看，蓄滞洪区灾害链又属于支干流域灾害链和蔓延侵蚀灾害链耦合形式。在搞清蓄滞洪区灾害链基础上，通过对大清河流域历史洪水灾害分析，发现流域洪水灾害具有明显的周期规律，将其在时间进程上划分为平静期、过渡期和活跃期3个阶段，而对某一大洪水而言，其灾害发生发展过程又可划分为早、中、晚期3个阶段。针对不同洪水灾害链式阶段，采用不同的措施，即孕育阶段采用断链措施，潜在期采用防御措施，诱发阶段采用治理措施。

英文摘要：

This article is aimed to introduce our research results on the characteristic features of flood chain and preventive-defensive measures in flooding-water storing and detention basins. As is known, the most important part of a hydraulic engineering project is to reduce the loss of flood disaster and detention of the flooding peaks. In this paper, we have done detailed study over the flood dis- aster chain in Wenanwa storage and detention basin so as to identify and analyze its characteristic features and the causes that are likely to result in the disaster both from the theoretical point of view and that of practice. The results of our investigation disclose that the flood disas- ter in the basin belongs to the rain-storm flood disaster chain coupled with the mountainous valley brooks gushing-in and spreading of the flood-erosion. Based on the analysis of the disaster chain theory and historical flood data recording in Daqinghe basin, the flood incidence regularity has been discovered by using the harmonic wave methods. It was found that the flood disaster process or course can be divided into quiet period, transition period and active period, the three phas- es of form an alternative cycle of different time lengths, usually a short period, of serious flooding disaster followed by a longer period, whose frequency may be influenced by the surrounding climatic envi- ronment. A big flood usually consists of three phases, namely, early, middle and late. And in turn corresponding measures are to be adopt- ed in correspondence of the actual disaster situation. The measures can be divided into preventive, defensive measures and controlling measures. Preventive and defensive measures are to be taken in the flood-potential phase whereas control measures are adopted in the out- break phase. The research results can be said to help lay a foundation of initial understanding of the flooding regularity and contribute to making efficient strategies of disaster prevention and reduction.