TY - JOUR
T1 - The impact of salt marsh change on sediment accumulation and wave attenuation at the East Chongming Island
AU - Ren, Linjing
AU - Li, Xiuzhen
AU - Yang, Shilun
AU - Yan, Zhongzheng
AU - Huang, Xing
PY - 2014
Y1 - 2014
N2 - As a key part of substance and energy exchange between land and ocean, estuarine wetland is the hotspot and focus of multiple disciplines. Under natural and artificial influences such as sea level rising, human reclamation, nature conservation, and exotic species invasion, salt marsh in the East Chongming wetlands had undergone severe changes during the past decades. Based on field investigation, remotely sensed images were classified and corrected for the periods of 1980, 1990, 2000 and 2010 at the East Chongming Island. In combination with existing research results, the impact of salt marsh change on sediment accumulation and wave attenuation of the East Chongming wetlands were quantified. The results showed that: the area ratio of Phragmites / Spartina / Scirpus were 23:0:77, 73:0:27, 33:9:58 and 34:34:32 in 1980, 1990, 2000 and 2010, respectively, with the total area of salt marsh vegetation changed from 51 km2 to 83 km2, 37 km2 and 44 km2. Under constant sedimentation during 1980-1990, the total amount of suspended particulate matter adhered by vegetation increased by 2669 t, while the amount of sediment accumulation increased by 619×104 m3. The length of seawall without enough vegetation protection under normal tidal heights and under storm surge decreased by 5 km and 14 km, respectively. Due to intensive human reclamation during 1990-2000, the total amount of suspended particulate matter adhered byvegetation decreased by 2453 t, the amount of sediment accumulation decreased by 1384×104 m3. The length of seawall without enough vegetation protection under normal tides and under storm surge increased by 7 km and 21 km, respectively. With the influences of constant sedimentation and exotic species invasion during 2000-2010, the total amount of suspended particulate matter adhered by vegetation increased by 2503 t, and sediment accumulation increased by 91×104 m3. The length of seawall without enough protection under normal tides and under storm surge decreased to 6 km and 20 km, respectively. Saltmarsh vegetation protection is of great importance for land accretion and for the safety behind the seawall, in addition to its importance for a number of other ecological functions such as bio-productivity, biodiversity, and purification.
AB - As a key part of substance and energy exchange between land and ocean, estuarine wetland is the hotspot and focus of multiple disciplines. Under natural and artificial influences such as sea level rising, human reclamation, nature conservation, and exotic species invasion, salt marsh in the East Chongming wetlands had undergone severe changes during the past decades. Based on field investigation, remotely sensed images were classified and corrected for the periods of 1980, 1990, 2000 and 2010 at the East Chongming Island. In combination with existing research results, the impact of salt marsh change on sediment accumulation and wave attenuation of the East Chongming wetlands were quantified. The results showed that: the area ratio of Phragmites / Spartina / Scirpus were 23:0:77, 73:0:27, 33:9:58 and 34:34:32 in 1980, 1990, 2000 and 2010, respectively, with the total area of salt marsh vegetation changed from 51 km2 to 83 km2, 37 km2 and 44 km2. Under constant sedimentation during 1980-1990, the total amount of suspended particulate matter adhered by vegetation increased by 2669 t, while the amount of sediment accumulation increased by 619×104 m3. The length of seawall without enough vegetation protection under normal tidal heights and under storm surge decreased by 5 km and 14 km, respectively. Due to intensive human reclamation during 1990-2000, the total amount of suspended particulate matter adhered byvegetation decreased by 2453 t, the amount of sediment accumulation decreased by 1384×104 m3. The length of seawall without enough vegetation protection under normal tides and under storm surge increased by 7 km and 21 km, respectively. With the influences of constant sedimentation and exotic species invasion during 2000-2010, the total amount of suspended particulate matter adhered by vegetation increased by 2503 t, and sediment accumulation increased by 91×104 m3. The length of seawall without enough protection under normal tides and under storm surge decreased to 6 km and 20 km, respectively. Saltmarsh vegetation protection is of great importance for land accretion and for the safety behind the seawall, in addition to its importance for a number of other ecological functions such as bio-productivity, biodiversity, and purification.
KW - East Chongming Island
KW - Salt marsh vegetation
KW - Sediment accumulation
KW - Total suspended particulate matter adhered
KW - Wave attenuation
UR - https://www.scopus.com/pages/publications/84904201634
U2 - 10.5846/stxb201311042665
DO - 10.5846/stxb201311042665
M3 - 文章
AN - SCOPUS:84904201634
SN - 1000-0933
VL - 34
SP - 3350
EP - 3358
JO - Shengtai Xuebao
JF - Shengtai Xuebao
IS - 12
ER -
