New evidence of Yangtze delta recession after closing of the Three Gorges Dam.

Abstract:

:Many deltas are likely undergoing net erosion because of rapid decreases in riverine sediment supply and rising global sea levels. However, detecting erosion in subaqueous deltas is usually difficult because of the lack of bathymetric data. In this study, by comparing bathymetric data between 1981 and 2012 and surficial sediment grain sizes from the Yangtze subaqueous delta front over the last three decades, we found severe erosion and significant sediment coarsening in recent years since the construction of Three Gorges Dam (TGD), the largest dam in the world. We attributed these morphological and sedimentary variations mainly to the human-induced drastic decline of river sediment discharge. Combined with previous studies based on bathymetric data from different areas of the same delta, we theorize that the Yangtze subaqueous delta is experiencing overall (net) erosion, although local accumulation was also noted. We expect that the Yangtze sediment discharge will further decrease in the near future because of construction of new dams and delta recession will continue to occur.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Luo XX,Yang SL,Wang RS,Zhang CY,Li P

doi

10.1038/srep41735

subject

Has Abstract

pub_date

2017-02-01 00:00:00

pages

41735

issn

2045-2322

pii

srep41735

journal_volume

7

pub_type

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