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汉江上游郧西段全新世古洪水事件研究

ISSN号：0375-5444
期刊名称：Acta Geographica Sinica
时间：2012
页码：671-680
分类：P467[天文地球—大气科学及气象学]
作者机构：[1]陕西师范大学旅游与环境学院,西安720062
相关基金：国家自然基金重点项目（41030637）;教育部博士点基金优先发展领域项目（20110202130002）;中央高校基本科研业务费专项基金（GK200901007）;陕西省教育厅自然科学研究计划项目（11JK0733）
相关项目：汉江上游(南水北调水源区)万年尺度古洪水水文学研究

关键词：汉江上游, 全新世, 滞流沉积物, 古洪水, 现代洪水, Hanjiang River, Holocene, slackwater deposit, palaeoflood, modem flood

中文摘要：

古洪水水文学是全球变化科学领域的前沿课题。通过对汉江上游的深入调查研究，在郧西段基岩峡谷发现全新世古洪水滞流沉积地层。通过沉积学观察研究，采样分析和与2010年汉江洪水滞流沉积物的粒度、磁化率特征对比，判定为典型的全新世洪水滞流沉积物（SWD）。通过全新世地层对比和光释光（OSL）测年，确定其记录了全新世时期3200-2800aBP的特大古洪水事件。在确定了古洪水洪峰水位和相关参数的基础上，采用比降法水文模型推算出该期洪水洪峰流量在48830-51710m^3/s之间。同时在该断面观测了汉江上游1983年、2005年和2010年洪水洪痕水位，采用相同水文参数和模型，恢复了其洪峰流量，与白河水文站实测流量比较，误差在1．99％-4．21％之间，说明我们对于古洪水水文参数选择与洪峰流量计算结果是合理的。从而将古洪水数据加入洪水频率序列中，建立了万年尺度洪水流量与频率关系。该研究成果为汉江上游水资源水能源开发利用和防洪减灾等，提供了重要的水文资料。

英文摘要：

Through field investigation in the upper reaches of Hanjiang River, palaeoflood slackwater deposits （SWD） were found in the bedrock gorges in the Yunxi reach. Based on field observation, laboratory analysis including grain-size distribution and magnetic susceptibility, and comparison with modem flood deposits, this SWD is identified as the most typical Holocene palaeoflood deposits in the Hanjiang River basin. By using stratigraphic correlation and OSL dating method, the palaeoflood events were dated to 3200-2800 aBP at the turn from the middle to late Holocene. According to the palaeoflood peak stages and hydraulic parameters, the peak discharges of the palaeoflood were reconstructed to 48830-51710 m^3/s by using the slope-area method. At the same time, the flood peak discharges of 1983, 2005 and 2010 extraordinary floods were reconstructed with the same method and hydraulic parameters in the same cross-section. The error between the reconstructed and gauged discharges is 1.99%-4.21%. This shows that the reconstructed palaeoflood peak discharges are reliable. The flood peak discharge-frequency relationship at 10000-year time scale is established by a combination of the data of gauged flood, historical flood and palaeoflood hydrology.

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