The determination of sedimentation rates in various vegetational zones of Chongming tidal flat of the Changjiang Estuary

JIANG Yifei; DU Jinzhou; ZHANG Jing; ZHANG Wenxiang; ZHANG Jing

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JIANG Yifei, DU Jinzhou, ZHANG Jing, ZHANG Wenxiang, ZHANG Jing. The determination of sedimentation rates in various vegetational zones of Chongming tidal flat of the Changjiang Estuary[J]. Haiyang Xuebao, 2012, 34(2): 114-121.

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The determination of sedimentation rates in various vegetational zones of Chongming tidal flat of the Changjiang Estuary

1. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 2010-04-06
Rev Recd Date: 2011-10-19

Abstract

Abstract

Six sediment cores, collected from Chongming tidal flat of the Changjiang Estuary in flood and dry seasons of 2007, were used to measure the sedimentation rates by the depth profiles of radionuclide excess ²¹⁰Pb, and ²²⁸Th, and ⁷Be. Based on the constant activity model (CA), various sedimentation rates on different time scales were evaluated by excess ²¹⁰Pb and ²²⁸Th, and ⁷Be. The results show that the sedimentation rates by excess ²¹⁰Pb and ²²⁸Th, and ⁷Be were decreased from phragmites australis to bare flat zone. More, all the sedimentation rates were decrease from short-time to long-time scale, reflecting the tidal flat being rebuilt by hydrological dynamics. Combined with the distribution patterns of particle size of sediment on temporal and spatial scales and atmospheric deposition flux of these nuclides, the impact factors on sedimentation rate were discussed in details.
- sedimentation rate,
- lead-210,
- thorium-228,
- beryllium-7,
- Chongming tidal flat

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