摘要
通过对汉江上游古洪水研究成果的整理,发现6个黄土-古土壤沉积剖面可能记录东汉时期一次古洪水事件。选取其中分布较为集中的4个沉积剖面(LJZ、TJZ、QFC-B、LWD-A)所在河段为研究对象,根据合适的地形数据及水文参数,运用HEC-RAS模型对东汉时期古洪水事件进行了水面线计算和演进模拟研究。结果表明,4个沉积剖面的模拟水位与野外调查计算水位较好吻合,误差均小于0.25%;河段内洪峰传播时间历时约3 h,洪峰流量削减1.43%,这符合汉江上游的洪水传播特性。这一方面说明基于HEC-RAS模型对于沉积纪录的东汉时期古洪水事件的模拟结果较为可靠;另一方面也说明4个沉积剖面可能记录东汉时期一次古洪水事件。该研究对于充分认识汉江上游的洪水运动规律具有一定的科学意义;对于流域的防洪减灾和洪水预报具有重要的现实意义。
Thes tudy re sults of the palaeoflood in the upper reaches of the Ha nj iang River suggest that six loess-paleosol sedimentary profiles may record a palaeoflood event in the Eastern Han Dynasty. Four sedi-mentary profiles （ LJZ, TJZ, QFC-B an d LWD -A） located in Yunxi-Yunxian sect ion with relatively con -centrated distribution are selected as research objects. Based on appropriate terrain data and appropriatehydrological parameters, the HEC-RAS model was u sed to calculate the water sur fa ce line and flood routing simulation in the Eastern Han Dynasty. The results show that the simulated win good agreement with the estimated water level in the field survey, and tThe peak propagation time is about 3 h , and the peak discharge isreduced by 1.43 % , which is consis t-ent with the flood propagation characteristics in the upper reaches of the Hanjiang that the simulation results based on the HEC-RAS model for palaeoflood events in the Ety are relatively reliable. In addition, it also shows that four sedimentary profiles may record a palaeoflood event in the Eastern Han Dynasty. The study has scientific significance for fully understanevolution law in the upper reaches of the Hanjiang River; ithas important practical significe for floodcontrol and flood forecasting in the Hanjiang River Basin.
作者
王光朋
查小春
黄春长
庞奖励
张国芳
WANG Guangpeng;ZHA Xiaochun;HUANG Chunchang;PANG JiangU;ZHANG Guofang(School of Geography and Tour ism,Shaanxi Normal U n iv e rs i ty,Xi’an 7 1 0 1 1 9,C h in a)
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2018年第3期44-53,共10页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家社会科学基金(14BZS070)
国家自然科学基金(71471071)
中央高校基本科研业务费专项基金(GK201601006)
关键词
东汉时期
古洪水研究
HEC-RAS模型
汉江上游
Eastern Han Dynasty
palaeoflood research
HEC-RAS model
upper reaches of Hang＇iang River
