Integrated Modeling of Typhoon Damrey’s Effects on Sediment Resuspension and Transport in the North Passage of Changjiang Estuary, China

The role of a remote tropical cyclone in sediment resuspension over the subaqueous delta front in the Changjiang Estuary, China

After the construction of the Deep-water Navigational Channel (DNC) in the North Passage of the Changjiang Estuary, siltation in the channel became severe during the flood season in the navigation channel. To investigate the causes, field observations of tidal current, salinity and suspended sediment concentration (SSC) were conducted by 16 anchored boats in the navigation channel of North Passage during spring tide in the flood season. The across-channel differences of salinity, SSC, and near bottom residual sediment transport at the high siltation area of the DNC were observed and analyzed. The results show that the near bottom SSC presented a south-to-north decreasing trend during the flood tide at the lower reach of the North Passage. During the ebb tide, a suspended sediment cloud of extremely high concentration was detected within the channel. The observed longitudinal sediment trapping was not only shown as the turbidity maximum (TM) trapped within the moving salinity front but also as the longitudinal convergence of the residual sediment transport at the middle reach. The mechanism for the longitudinal sediment trapping was due to the tidal asymmetry in mixing. The observed lateral sediment trapping was prominent at the most severe siltation area of the DNC in the section #2. The lateral sediment trapping at the across-channel section #2 was not only shown as the lateral transport of the sediments from the channel flanks during the flood slack but also as the lateral convergence of the residual sediment transport during the entire spring tidal cycle. The mechanism for the lateral sediment trapping was dominated by the advective transport. The lateral impact on the channel sediment trapping was not negligible in view of the depth-mean lateral tidal straining on the water stratification. The observed convergences of both the longitudinal and the lateral residual sediment transports were responsible for the severe channel siltation in the North Passage.

Observation of the sediment trapping during flood season in the deep-water navigational channel of the Changjiang Estuary, China

Typhoon triggers estuarine heavy metal risk by regulating the multifractal grainsize of resuspended sediment.

This paper proposes a metanetwork framework for modeling dependent Actor-Plan-Task-Infrastructure networks. The proposed framework is able to quantitatively evaluate the extent to which coo...

Metanetwork Framework for Analysis of Actor-Plan-Task-Infrastructure Networks in Resilience Planning and Management

Shen, Q; Gu, F; Qi, D, and Huang, W, 2014 Numerical study on the flow and sediment variation affected by the sea-level rise in the north passage of the Yangtze estuary A three-dimensional, sigma coordinate coastal ocean model, based on unstructured C-grid and semi-implicit finite volume method, is built to study the flow and sediment variation affected by the sea-level rise (SLR) at the north passage of the Yangtze estuary Firstly, the details of the numerical method used in this model are introduced, including the layout of model variables, the discretization of the governing equations and the semi-implicit method, etc Then, two test cases are employed to verify the proposal model, including an idealized test case as well as a simulation of the tidal flow and mass transport at the north passage of the Yangtze Estuary Finally, based on the verified model, a numerical study on the flow and sediment variation affected by the SLR at the north passage of the Yangtze estuary is carried out T

Numerical Study of Flow and Sediment Variation Affected by Sea-Level Rise in the North Passage of the Yangtze Estuary

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Integrated Modeling of Typhoon Damrey’s Effects on Sediment Resuspension and Transport in the North Passage of Changjiang Estuary, China

Numerical Study of Flow and Sediment Variation Affected by Sea-Level Rise in the North Passage of the Yangtze Estuary