Acta Geographica Sinica ›› 2009, Vol. 64 ›› Issue (5): 541-552.doi: 10.11821/xb200905003

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Palaeoflood Occurrence in the Late Period of the Longshan Culture in the Middle Reaches of the Jinghe River

LI Yuqin1, HUANG Chunchang1, ZHA Xiaochun1, PANG Jiangli2   

  1. 1. College of Tourism and Environmental Sciences,Shaanxi Normal University,Xi'an 710062,China;
    2. State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Institute of Water and Soil Conservation,CAS and Ministry of Water Resources,Yangling 712100,Shaanxi,China
  • Received:2008-10-08 Revised:2009-02-25 Online:2009-05-25 Published:2010-08-03
  • Supported by:

    National Natural Science Foundation of China,No.40771018;Doctoral Fund from the Ministry of Education,No. 20050718008;State Key Laboratory Fund of Soil Erosion and Dryland Farming on Loess Plateau,No.10501-176; Natural Science Foundation of Shaanxi,No. 2006D01

Abstract:

Through investigation of the middle reaches of the Jinghe River, we choose the slackwater deposits for palaeohydrology study. On the basis of field survey, samples of the slackwater deposits were collected and the grain-size distribution, the magnetic susceptibility variation, the loss on ignition and the content of calcium carbonate were determined. All of these indexes showed that the slackwater deposits were typical in the study area. According to the stratigraphic correlation and cultural remains including fragments of pottery and burnt earth, we identified the corresponding palaeoflood which occurred in the late period of Longshan Culture (4200-4000 a B.P.). Supported by the hydrological technique, we reconstructed that the peak discharges of the palaeofloods were 19490-22040 m3/s. Meanwhile, reconstruction of modern gauged flood proved the hydrological method was reliable. And the relationship between drainage area and flood peak discharge illustrated that the results were reasonable. Thus, the results prolong the flood data sequence of Jinghe River and provide significant data for engineering construction, flood control and disaster alleviation in the middle reaches of the Jinghe River.

Key words: Jinghe River, palaeoflood, slackwater deposits, palaeohydrology, Longshan Cultur