Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach
Abstract Nearshore erosion is well‐documented in sediment‐deficit river deltas but remains less understood beyond their delta front (DF), particularly its extension to the deeper prodelta (PD) and distal mud (DM). This study investigates the response of Changjiang subaqueous delta and its DM to sedi...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-02-01
|
| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2024GL113057 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849322165432745984 |
|---|---|
| author | Yijing Wu Daidu Fan Jianfeng Su |
| author_facet | Yijing Wu Daidu Fan Jianfeng Su |
| author_sort | Yijing Wu |
| collection | DOAJ |
| description | Abstract Nearshore erosion is well‐documented in sediment‐deficit river deltas but remains less understood beyond their delta front (DF), particularly its extension to the deeper prodelta (PD) and distal mud (DM). This study investigates the response of Changjiang subaqueous delta and its DM to sediment decline following the 2003 closure of the Three Gorges Dam. By analyzing temporal and spatial variations in 210Pbex profile styles, discrepancies between 210Pb and 137Cs sediment accumulation rates, and surface sediment grain sizes, we identified the onset of erosion at the DF shortly after 2003, which spread to the PD by 2009 and reached the northern DM by 2015. By tracking the burial depths of the 1963 137Cs peak, we found progressively lower erosion rates in newly eroded subzones primarily due to sediment redistribution. This study, leveraging historical radionuclides data, offers a valuable approach for monitoring erosion in areas lacking remote sensing detection and historical bathymetric data. |
| format | Article |
| id | doaj-art-ced09442fea84348b43663bc83c267a6 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-ced09442fea84348b43663bc83c267a62025-08-20T03:49:31ZengWileyGeophysical Research Letters0094-82761944-80072025-02-01524n/an/a10.1029/2024GL113057Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide ApproachYijing Wu0Daidu Fan1Jianfeng Su2State Key Laboratory of Marine Geology Tongji University Shanghai ChinaState Key Laboratory of Marine Geology Tongji University Shanghai ChinaState Key Laboratory of Marine Geology Tongji University Shanghai ChinaAbstract Nearshore erosion is well‐documented in sediment‐deficit river deltas but remains less understood beyond their delta front (DF), particularly its extension to the deeper prodelta (PD) and distal mud (DM). This study investigates the response of Changjiang subaqueous delta and its DM to sediment decline following the 2003 closure of the Three Gorges Dam. By analyzing temporal and spatial variations in 210Pbex profile styles, discrepancies between 210Pb and 137Cs sediment accumulation rates, and surface sediment grain sizes, we identified the onset of erosion at the DF shortly after 2003, which spread to the PD by 2009 and reached the northern DM by 2015. By tracking the burial depths of the 1963 137Cs peak, we found progressively lower erosion rates in newly eroded subzones primarily due to sediment redistribution. This study, leveraging historical radionuclides data, offers a valuable approach for monitoring erosion in areas lacking remote sensing detection and historical bathymetric data.https://doi.org/10.1029/2024GL113057delta regime shiftsubaqueous delta erosiondistal mudnon‐steady‐state accumulation |
| spellingShingle | Yijing Wu Daidu Fan Jianfeng Su Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach Geophysical Research Letters delta regime shift subaqueous delta erosion distal mud non‐steady‐state accumulation |
| title | Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach |
| title_full | Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach |
| title_fullStr | Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach |
| title_full_unstemmed | Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach |
| title_short | Cascading Erosion in the Tide‐Dominated Changjiang Delta: A Novel Radionuclide Approach |
| title_sort | cascading erosion in the tide dominated changjiang delta a novel radionuclide approach |
| topic | delta regime shift subaqueous delta erosion distal mud non‐steady‐state accumulation |
| url | https://doi.org/10.1029/2024GL113057 |
| work_keys_str_mv | AT yijingwu cascadingerosioninthetidedominatedchangjiangdeltaanovelradionuclideapproach AT daidufan cascadingerosioninthetidedominatedchangjiangdeltaanovelradionuclideapproach AT jianfengsu cascadingerosioninthetidedominatedchangjiangdeltaanovelradionuclideapproach |