| 黄河靖远-景泰段全新世古洪水水文事件水文指标模拟及气候背景分析 |
| |
| 引用本文： | 胡贵明,黄春长,周亚利,庞奖励,查小春,郭永强,赵雪如.黄河靖远-景泰段全新世古洪水水文事件水文指标模拟及气候背景分析[J].资源科学,2015,37(10):2059-2067. |
| |
| 作者姓名： | 胡贵明 黄春长 周亚利 庞奖励 查小春 郭永强 赵雪如 |
| |
| 作者单位： | 陕西师范大学旅游与环境学院,西安 710062 |
| |
| 基金项目： | 国家自然科学基金面上项目(41471071) |
| |
| 摘 要： | 依黄河上游靖远-景泰峡谷段金坪村和营坪村两地点发现的典型全新世古洪水滞流沉积地层,将其命名为JPC和YPC剖面,系统观测该河段水文参数,采取ArcGIS耦合HEC-RAS模型技术路线,推算出其洪峰流量介于(15 110~17 740)m3/s。河槽糙率灵敏度检验表明,给定糙率±25%变幅,模型模拟得到的洪峰流量误差在-10.6%~5.5%之间。采用该模型和相同水文参数,根据该河段2012年大洪水洪痕高程,恢复推算其洪峰流量,其结果与实测数据误差仅为2.7%,可知采用ArcGIS耦合HEC-RAS模型模拟恢复古洪水洪峰水位和洪峰流量结果是可靠的。通过OSL技术测年和地层对比方法,确定该期古洪水事件发生在3 200a B.P.~3 000a B.P.,此时段东亚季风发生恶化转折,河流水文系统发生相应的变化。该期特大古洪水事件是河流水文系统对于季风气候事件的响应。这些研究成果可为黄河上游水利枢纽、交通工程和防洪工程建设提供基础性数据,对深入了解黄河上游流域环境对于全球变化的响应规律具有重要的科学意义。
|
| 关 键 词： | 全新世 古洪水 滞流沉积地层 HEC-RAS模型 气候变化 黄河靖远-景泰段 水文事件 水文指标 |
| 收稿时间： | 2015-01-07 |
| 修稿时间： | 2015-05-08 |
Hydrological reconstructions and climate events of the holocene paleoflood in the Jingyuan-Jingtai reach on the Yellow River |
| |
| HU Guiming,HUANG Chunchang,ZHOU Yali,PANG Jiangli,ZHA Xiaochun,GUO Yongqiang,ZHAO Xueru.Hydrological reconstructions and climate events of the holocene paleoflood in the Jingyuan-Jingtai reach on the Yellow River[J].Resources Science,2015,37(10):2059-2067. |
| |
| Authors: | HU Guiming HUANG Chunchang ZHOU Yali PANG Jiangli ZHA Xiaochun GUO Yongqiang ZHAO Xueru |
| |
| Institution: | College of Tourism and Environmental Sciences,Shanxi Normal University,Xi'an 710062,China |
| |
| Abstract: | Hydrological and geomorphological investigations were carried out in the upper reaches of the Yellow River. Typical palaeoflood slackwater deposit beds of the Holocene period were found at the JPC and YPC site in the Jingyuan-Jingtai gorge. The palaeoflood peak stages were estimated with elevations and deposition depths of the SWD. The results indicated palaeoflood discharges were estimated between 15 110 and 17 740m3/s using the HEC-RAS one dimensional model running with the ArcView environment. A sensitivity test performed on the model indicated that for a 25% variation in roughness values,an error between -10.6% and 5.5% was introduced in the results for peak discharge. Based on flood stage indicators,peak discharge of the 2012 flood was reconstructed in the same reach using the HEC-RAS model and the same hydraulic parameters. The error between the reconstructed and gauged peak flood discharges is 2.7%. These show that the results reconstructed by the HEC-RAS model are reliable. The reconstructed peak discharge of the palaeoflood are about twice the gauged largest floods in the upper Yellow River reach. The flood data series for the river were extended to a 10,000-year time-scale. Stratigraphic correlation and OSL dating shows that extreme palaeofloods were dated to 3 200~3 000 years ago at the turn of the termination of middle Holocene and the initiation of the late Holocene,during the monsoonal shift in the East Asia. The hydrological system experienced abrupt change under the climatic background. Extreme palaeoflood events were documented not only in the upper Yellow River reaches,but also in the middle reaches and other tributaries of the Yellow River. These findings are of significance in understanding interactions between hydrological systems and climatic change in arid and semi-arid regions in China. |
| |
| Keywords: | holocene palaeoflood slackwater deposit HEC-RAS model the Jingyuan-Jingtai reach on the Yellow River hydrological events hydrological parameters |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《资源科学》浏览原始摘要信息 |
| 点击此处可从《资源科学》下载免费的PDF全文 |
|
