GSTDTAP  > 资源环境科学
DOI10.1029/2019WR025514
The Role of Collapsed Bank Soil on Tidal Channel Evolution: A Process-Based Model Involving Bank Collapse and Sediment Dynamics
Zhao, K.1; Gong, Z.1,2; Xu, F.3; Zhou, Z.1; Zhang, C. K.1; Perillo, G. M. E.4,5; Coco, G.6
2019-11-14
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2019
文章类型Article;Early Access
语种英语
国家Peoples R China; Argentina; New Zealand
英文摘要

We develop a process-based model to simulate the geomorphodynamic evolution of tidal channels, considering hydrodynamics, flow-induced bank erosion, gravity-induced bank collapse, and sediment dynamics. A stress-deformation analysis and the Mohr-Coulomb criterion, calibrated through previous laboratory experiments, are included in a model simulating bank collapse. Results show that collapsed bank soil plays a primary role in the dynamics of bank retreat. For bank collapse with small bank height, tensile failure in the middle of the bank (Stage I), tensile failure on the bank top (Stage II), and sectional cracking from bank top to the toe (Stage III) are present sequentially before bank collapse occurs. A significant linear relation is observed between bank height and the contribution of bank collapse to bank retreat. Contrary to flow-induced bank erosion, bank collapse prevents further widening since the collapsed bank soil protects the bank from direct bank erosion. The bank profile is linear or slightly convex, and the planimetric shape of tidal channels (gradually decreasing in width landward) is similar when approaching equilibrium, regardless of the consideration of bank erosion and collapse. Moreover, the simulated width-to-depth ratio in all runs is comparable with observations from the Venice Lagoon. This indicates that the equilibrium configuration of tidal channels depends on hydrodynamic conditions and sediment properties, while bank erosion and collapse greatly affect the transient behavior (before equilibrium) of the tidal channels. Overall, this contribution highlights the importance of collapsed bank soil in investigating tidal channel morphodynamics using a combined perspective of geotechnics and soil mechanics.


英文关键词tidal channels bank collapse numerical modeling collapsed bank soil
领域资源环境
收录类别SCI-E
WOS记录号WOS:000496483300001
WOS关键词SEEPAGE EROSION ; SALT MARSHES ; EQUILIBRIUM ; STABILITY ; RETREAT ; MORPHODYNAMICS ; CONSOLIDATION ; MIGRATION ; GEOMETRY ; FAILURES
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/223896
专题资源环境科学
作者单位1.Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;
2.Hohai Univ, Jiangsu Key Lab Coast Ocean Resources Dev & Envir, Nanjing, Jiangsu, Peoples R China;
3.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China;
4.Consejo Nacl Invest Cient & Tecn, Inst Argentino Oceanog, Bahia Blanca, Buenos Aires, Argentina;
5.UNS, Bahia Blanca, Buenos Aires, Argentina;
6.Univ Auckland, Sch Environm, Auckland, New Zealand
推荐引用方式
GB/T 7714
Zhao, K.,Gong, Z.,Xu, F.,et al. The Role of Collapsed Bank Soil on Tidal Channel Evolution: A Process-Based Model Involving Bank Collapse and Sediment Dynamics[J]. WATER RESOURCES RESEARCH,2019.
APA Zhao, K..,Gong, Z..,Xu, F..,Zhou, Z..,Zhang, C. K..,...&Coco, G..(2019).The Role of Collapsed Bank Soil on Tidal Channel Evolution: A Process-Based Model Involving Bank Collapse and Sediment Dynamics.WATER RESOURCES RESEARCH.
MLA Zhao, K.,et al."The Role of Collapsed Bank Soil on Tidal Channel Evolution: A Process-Based Model Involving Bank Collapse and Sediment Dynamics".WATER RESOURCES RESEARCH (2019).
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