汉江上游沉积记录的东汉时期古洪水事件考证研究
The palaeoflood events recorded by slackwater deposits in sedimentary profiles during the Eastern Han Dynasty in the upper reaches of the Hanjiang River
查看参考文献57篇
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文摘
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总结近年来在汉江上游古洪水研究成果的基础之上,采用文献资料分析和洪水模拟计算方法,对汉江上游6个沉积剖面纪录的东汉时期古洪水事件进行了年代考证和洪水模拟计算。结果表明,通过分析文献记载的汉江上游东汉时期洪水影响范围、强度和程度,以及结合洪痕沉积规律,在时间上考证认为这6个沉积剖面记录的东汉时期古洪水事件可能是东汉建安二年(197年)九月的一次特大洪水事件。选取合适的河槽横断面和糙率系数,采用HEC-RAS模型对距离较近的4个沉积面记录的东汉时期古洪水事件进行洪水模拟计算,模拟洪水位与各剖面依据古洪水SWD恢复的洪水位误差在-0.18%~0.25%,而且模拟的1983年洪水位与剖面及其附近发现的1983年洪痕水位误差小于0.25%,说明洪水模拟计算选取的河槽横断面和水文参数准确、可靠,从洪水模拟计算的角度也说明了汉江上游沉积记录的东汉时期古洪水事件可能为一次特大洪水事件。该研究结果不仅延长了汉江上游洪水序列,而且也为汉江上游水利工程建设、水资源管理和防洪减灾等提供重要的水文资料。 |
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其他语种文摘
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Based on the research on palaeoflood hydrology in the upper reaches of Hanjiang River, the palaeoflood events recorded by slackwater deposits in upper layers of 6 loess- soil profiles were found to occur during the Eastern Han Dynasty. In this paper, the flood time of the palaeoflood events during the study period was examined textually by the historical literature analysis, and the flood simulaton was made using the HEC-RAS model. The study results showed that the palaeoflood during the Eastern Han Dynasty might be an extraordinary flood event that occurred in September (lunar month), the second year of the Jian'an period (197) in terms of the influence scope, degree, intensity, and the deposit rule of the floodmarks. Then selecting reasonable channel sections and roughness coefficient, and setting the river boundary conditions and initial conditions, we used the HEC-RAS model to conduct the flood simulation of the palaeoflood events. The errors between the simulated and the calculated flood stages were -0.18%~0.25%/o. Moreover, the errors of the simulated flood stages in 1983 were 0.25% less than those of the floodmark stages in 1983 found near the profiles. The flood simulation results showed that the selected channel sections and hydrological parameters were accurate and reliable, indicating that the palaeoflood events during the Eastern Han Dynasty might be an extraordinary flood event. The study results not only prolonged the flood sequences, but also provided the important hydrological data for the hydropower project construction, water resource management and the flood control and disaster mitigation in the upper reaches of the Hanjiang River. |
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来源
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地理学报
,2017,72(9):1634-1644 【核心库】
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DOI
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10.11821/dlxb201709008
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关键词
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古洪水事件
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沉积记录
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东汉时期
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汉江上游
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考证研究
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地址
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陕西师范大学地理科学与旅游学院地理学国家级实验教学示范中心, 西安, 710062
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0375-5444 |
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学科
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地球物理学 |
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基金
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国家社会科学基金
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国家自然科学基金项目
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中央高校基本科研业务费专项资金
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文献收藏号
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CSCD:6068308
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57
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