Short- and long-term sediment transport in western Bohai Bay and coastal areas

Huan Feng, Weiguo Zhang, Li Jia, Michael P. Weinstein, Qiufeng Zhang, Dekui Yuan, Jianhua Tao, Lizhong Yu

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Sediment cores (~40-100 cm) were collected at 12 locations in the western Bohai Bay, the Haihe River estuary, the Yongding River estuary and the Tianjin Harbor, China, during 24-26 July 2007, and analyzed for 7Be and 210Pb activities. Due to localized hydrodynamic patterns and frequent disturbance from dredging activities, steady-state sedimentation features were not observed in this study. As demonstrated in the 7Be and 210Pb profiles, the temporal and spatial variations of these radionuclides support a non-steady state depositional environment in the study area. By comparing 7Be and 210Pb inventories in the sediments with those of the atmospheric source, we found that: 1) sediments dredged from the Tianjin Harbor or eroded from nearby estuarine and coastal areas are retained in the western Bohai Bay for relatively short intervals (several months), as reflected in the relatively high 7Be inventories in the western Bohai Bay; 2) over the long-term (years to decades), 210Pb inventories in the sediments imply that there is a net on-shore transport of sediments, and the sediments are mass-balanced in the entire study area. Overall, our results suggest that the sediments are retained in the estuaries and the western Bohai Bay despite local variability in sediment dynamics and disturbance due to human activities.

Original languageEnglish
Pages (from-to)583-592
Number of pages10
JournalChinese Journal of Oceanology and Limnology
Volume28
Issue number3
DOIs
StatePublished - 1 May 2010

Keywords

  • Bohai Bay
  • estuary
  • radionuclide
  • sediment transport
  • sedimentation

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