Acta Geographica Sinica ›› 2012, Vol. 67 ›› Issue (5): 609-620.doi: 10.11821/xb201205004

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Influence of Human Activities on the Riverbed Evolution in Yalu River Estuary during Recent One Century

CHENG Yan1, LIU Yue1, GAO Jianhua2, ZHANG Chunpeng1, LI Fuxiang1,3, LIU Jingwei1, ZHANG Liang1   

  1. 1. Urban Construction College, Eastern Liaoning University, Dandong 118003, Liaoning, China;
    2. Key Laboratory of Coast and Island Development of Ministry of Education, Nanjing University, Nanjing 210093, China;
    3. College of Urban and Environment Science, Liaoning Normal University, Dalian 116029, Liaoning, China
  • Received:2011-07-30 Revised:2012-02-03 Online:2012-05-20 Published:2012-05-20
  • Supported by:
    National Natural Science Foundation of China, No.40871019; No.40976051

Abstract: The two cores of modern sediments lying in the West-branch-way of Yalu River estuary is characterized by better continuity, higher time resolution and most gulf sediments. The deposition rate, grain characteristics, detrital minerals and heavy metals were measured and analyzed. The depositing process from 1920 with an average rate of 0.98 cm/a in the upstream of West-branch-way was recorded in the core. The vertical distribution of grain parameters, indicative detrital minerals and heavy metals shows that the sediments were mainly from the estuarine deposit of marine phase alternated with the deposit of fluvial phase. In comparison with previous studies, the result reveals the impact of human activities on the riverbed evolution in Yalu River estuary during recent 100 years. The influence of water conservancy projects was mainly in the early period, which led to a great change in riverbed landform. The evolution caused by land reclamation occurred in the middle period and it also exerted a significant effect on riverbed landform and made the terrestrial area bigger and water area smaller continuously. The influence of human activities such as waterway regulation appeared in the middle and late period, during which there was no obvious change in the riverbed landform. The influence of latest human activities needs to be further studied.

Key words: Yalu River estuary, human activities, riverbed evolution