三峡河段古洪水平流沉积指标体系

Index system of ancient diluvial deposits at TGP dam site

长江三峡工程古洪水研究工作的第一个关键是如何寻找和准确判断古洪水信息载体———古洪水平流沉积，因为这些沉积尤其是带有尖灭点的沉积形成与保存所需要的条件是相当苛刻的。根据淮河响洪甸、海河黄壁庄水库的古洪水研究，结合三峡河段的特点，建立了一套野外寻求和识别及实验分析判定古洪水平流沉积的指标体系，对古洪水研究的推广应用具有较高的实用价值。

The first key to research work on ancient floods at the Three Gorges Project is how to find and accurately decide the information carrier of ancient floods ancient diluvial deposits, because the conditions needed for the formation and conservation of these deposits, especially of those with thin out point, are very strict. On the basis of studies on ancient flood at Xianghongdian reservoir on the Huaihe river and at Huangbizhuang reservoir on the Haihe river, and in consideration of the features of the Yangtze rivers Three Gorges reach, an index system to find and identify ancient diluvial deposit in field and to decide it through experiment and analysis has been established. This system has higher practical value for investigation of ancient floods.