Journal of Geographical Sciences ›› 2015, Vol. 25 ›› Issue (8): 899-916.doi: 10.1007/s11442-015-1209-4
• Orginal Article • Next Articles
Chengcheng SONG1,2(), Xiaojing SUN3, Jun WANG1,2,*(
), Mengya LI1,2, Lu ZHENG1,2
Received:
2014-12-20
Accepted:
2015-01-25
Online:
2015-08-15
Published:
2015-07-17
Contact:
Jun WANG
E-mail:songchengcheng2008@163.com;jwang@geo.ecnu.edu.cn
About author:
Author: Song Chengcheng (1991-), specialized in assessment of coastal disaster risk. E-mail:
Supported by:
Chengcheng SONG, Xiaojing SUN, Jun WANG, Mengya LI, Lu ZHENG. Spatio-temporal characteristics and causes of changes in erosion-accretion in the Yangtze (Changjiang) submerged delta from 1982 to 2010[J].Journal of Geographical Sciences, 2015, 25(8): 899-916.
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Table 1
Analysis of erosion-accretion for the different study periods"
Indicators/periods | 1982-2010 | 1982-1997 | 1997-2002 | 2002-2010 |
---|---|---|---|---|
Area ratio of accretion and erosion zones | 0.92 | 0.90 | 1.14 | 1.05 |
Net erosion-accretion quantity (108 m3/yr) | -0.54 | -1.26 | 0.74 | -0.01 |
Net erosion-accretion rate (cm/yr) | -1.11 | -2.56 | 1.50 | -0.02 |
Accretion area (108 m2) | 23.66 | 23.32 | 26.21 | 25.18 |
Accretion volume (108 m3) | 41.98 | 31.02 | 28.01 | 30.96 |
Erosion area (108 m2) | 25.46 | 25.80 | 22.92 | 23.96 |
Erosion volume (108 m3) | 57.25 | 49.93 | 24.32 | 31.02 |
Table 2
District statistics of erosion-accretion change in different periods in the Yangtze Estuary"
Indicators Areas/periods | Net erosion-accretion quantity (108 m3) | Net erosion-accretion rate (cm/yr) | ||||||
---|---|---|---|---|---|---|---|---|
1982-2010 | 1982-1997 | 1997-2002 | 2002-2010 | 1982-2010 | 1982-1997 | 1997-2002 | 2002-2010 | |
① NB | 1.91 | -0.76 | 1.35 | 1.32 | 3.11 | -2.32 | 12.31 | 7.52 |
② SB | -6.40 | -4.87 | 0.65 | -2.18 | -4.63 | -6.57 | 2.60 | -5.46 |
③ NC | -4.70 | -2.99 | -0.76 | -0.94 | -10.57 | -12.57 | -9.41 | -7.27 |
④ SC | -1.36 | 0.79 | -0.83 | -1.32 | -2.52 | 2.72 | -8.47 | -8.42 |
⑤ CM | -4.53 | -11.28 | 5.85 | 0.89 | -1.31 | -6.07 | 9.45 | 0.90 |
⑥ HS | -0.52 | -2.91 | -1.71 | 4.10 | -0.22 | -2.36 | -4.13 | 6.19 |
⑦ JDS | -0.18 | 1.90 | -0.35 | -1.73 | -0.09 | 1.86 | -1.02 | -3.14 |
⑧ NH | 0.83 | 1.41 | -0.56 | -0.02 | 0.27 | 0.86 | -1.03 | -0.03 |
Table 3
Statistics for the ESA of different isobaths"
Year | Total area (km2) | Change rate (km2/yr) | |||||
---|---|---|---|---|---|---|---|
1982 | 1997 | 2002 | 2010 | 1982-1997 | 1997-2002 | 2002-2010 | |
The area within 2 m isobath | 526.29 | 607.93 | 609.88 | 818.12 | 5.44 | 0.39 | 26.03 |
The area within 5 m isobath | 1685.09 | 1657.73 | 1712.27 | 1808.22 | -1.82 | 10.91 | 11.99 |
The area within 10 m isobath | / | 3938.22 | 3883.00 | 3693.94 | / | -11.04 | -23.63 |
The area within 15 m isobath | / | 4856.77 | 4724.45 | 4765.91 | / | -26.46 | 5.18 |
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