仅仅数十年的实测洪水数据和史料记载的仅数百年的历史洪水数据，极大地限制了水利水电工程建设与交通工程建设中 “设计洪水” 的精度。丹江流域是南水北调中线水源地，对洪水资源化、能源化的合理调度和转化的要求逐渐升高。通过野外考察观测、采样和室内实验分析，获得史前大洪水事件及其洪峰水位的沉积学证据，结合光释光测年技术，确定这些洪水事件的发生年代。采用古洪水水文学方法和HEC-RAS模型恢复其洪峰水位和洪峰流量，将丹江流域洪水水文数据延长到万年尺度。结合实测洪水和历史洪水建立万年尺度洪水流量与频率关系，在“千年一遇”、“万年一遇”的设计洪水中由外延转变为内插，从而提高设计精度。同时将以丹江现代实测大洪水水位和流量为基础数据，来对史前大洪水水文恢复的精度进行验证和误差分析。这对于丹江流域水资源及水能源开发和防洪减灾等具有现实意义。对大洪水事件发生的气候背景及全球变化的响应具有重要的科学意义。

Only a few decades of measured flood data and the historical flood data of hundreds of years have greatly restricted the accuracy of design flood in the construction of water conservancy and hydropower projects and the construction of traffic engineering. The Danjiang basin is the water source of the Middle Route South-North Water Transfer Project. The reasonable scheduling and transformation of the resources and energy of flood is gradually increasing. Sedimentary records of the pre-historical great floods events and their peak stages will be identified based on field observation, measurement, sediment sampling and laboratory analysis. These flood events will be dated by using OSL dating and historical dating methods. The peak stages and discharges of these pre-historical great floods will be reconstructed by using p HEC-RAS hydraulic models. The flood data series will be extended to a 10,000-year time-scale in the Danjiang River. The relations of flood discharge-occurrence frequency within a timescale of 10,000 years will be established by using the composed data series of the pre-historical great floods, historical floods and modern floods recorded in hydrological gauge stations. In the design flood, the extension will be changed into interpolation. These results are very useful in utilizing water resources and water energy and mitigating of flood disasters along the Danjiang River. They are of great importance in revealing the relations between extraordinary flood events and monsoonal climatic change, and in understanding the responses of hydrological system to global change in the Danjiang River.