TY - JOUR
T1 - Impact of Anthropogenic Activities and Sea Level Rise on a Lagoon System
T2 - Model and Field Observations
AU - Kuang, Cuiping
AU - Cong, Xin
AU - Dong, Zhichao
AU - Zou, Qingping
AU - Zhan, Huaming
AU - Zhao, Wei
N1 - Funding Information:
Funding: This research was funded by the National Natural Science Foundation of China under contract no. 41976159, and the National Key Research and Development Project of China under contract no. 2019YFC1407900.
Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/12/6
Y1 - 2021/12/6
N2 - The long-term geomorphological evolution of a coastal lagoon is driven by hydrodynamic forcing and is influenced by climate changes and human activities. In this study, a numerical model of the Qilihai lagoon (QL) system was established based on field measurements, previous hydrology data and satellite remote sensing measurements, to simulate the geomorphological evolution of QL from 1900 to 2018. The influences of sea level rise, runoff and human activities on the evolution of geomorphology were investigated. The results of the model show that the construction projects including the tide gate, the bridge, reclamation and the straightening or widening of the tidal channel increased the net deposition within the QL system. Furthermore, the spatial distribution of tidal asymmetry during the natural time period was similar to that of the change in bed thickness. However, bed erosion or deposition was not only dependent on tidal asymmetry but it was also affected by the external sediment supply and the discharge of upstream rivers. Moreover, sea level rise had a significant effect on the tidal asymmetry; therefore, it enhanced the accumulation of sediments in the QL system, while runoff had little effect on the tidal asymmetry or geomorphological changes in the system.
AB - The long-term geomorphological evolution of a coastal lagoon is driven by hydrodynamic forcing and is influenced by climate changes and human activities. In this study, a numerical model of the Qilihai lagoon (QL) system was established based on field measurements, previous hydrology data and satellite remote sensing measurements, to simulate the geomorphological evolution of QL from 1900 to 2018. The influences of sea level rise, runoff and human activities on the evolution of geomorphology were investigated. The results of the model show that the construction projects including the tide gate, the bridge, reclamation and the straightening or widening of the tidal channel increased the net deposition within the QL system. Furthermore, the spatial distribution of tidal asymmetry during the natural time period was similar to that of the change in bed thickness. However, bed erosion or deposition was not only dependent on tidal asymmetry but it was also affected by the external sediment supply and the discharge of upstream rivers. Moreover, sea level rise had a significant effect on the tidal asymmetry; therefore, it enhanced the accumulation of sediments in the QL system, while runoff had little effect on the tidal asymmetry or geomorphological changes in the system.
KW - Anthropogenic activities
KW - Geomorphological evolution
KW - Qilihai lagoon
KW - Sea level rise
KW - Tidal asymmetry
KW - Tidal channel
UR - http://www.scopus.com/inward/record.url?scp=85121729113&partnerID=8YFLogxK
U2 - 10.3390/jmse9121393
DO - 10.3390/jmse9121393
M3 - Article
SN - 2077-1312
VL - 9
JO - Journal of Marine Science and Engineering
JF - Journal of Marine Science and Engineering
IS - 12
M1 - 1393
ER -