NDLI: Impact of a sudden tidal prism increase in estuarine sediment flux: implications to remobilization of Hg-contaminated sediment

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Impact of a sudden tidal prism increase in estuarine sediment flux: implications to remobilization of Hg-contaminated sediment

Content Provider	Scilit
Author	Achete, Fernanda Minikowski
Copyright Year	2020
Description	In tide driven estuaries the tidal prism is an important process for the magnitude of the sediment flux. Since heavy metals adhere to fine sediment, the sediment path dictates the contaminant's fate. Alviso Slough in South San Francisco Bay is experiencing restoration of adjacent salt ponds into tidal ponds and salt marsh, which is having the effect of increasing the tidal prism and remobilizing mercury-contaminated sediment. We used a process-based model for investigating the impact of tidal prism increase on both sediment flux in the slough and the remobilization of contaminated sediment. Our results demonstrate that in Alviso Slough, the increase of tidal prism leads to erosion of the slough, increasing sediment export to the bay. Most of the exported sediment are due to erosion close to the mouth of Alviso Slough. Sedimentation in the slough decreases with increased tidal prism as a result of the changes in sediment flux and the import of sediment into the restored tidal ponds. Within a 3 month simulation, restoration of salt ponds to tidal exchange with the bay remobilizes about 3 kg of mercury. Most of the sediment remobilized from upstream, and mid-slough sediment is trapped inside the ponds, which to a large extent minimizes the export of this higher contaminated sediment into the South Bay. Book Name: Multiple Scales of Suspended Sediment Dynamics in a Complex Geometry Estuary
Related Links	https://content.taylorfrancis.com/books/download?dac=C2016-0-96512-1&isbn=9780138746278&doi=10.1201/9780138746278-4&format=pdf
Ending Page	88
Page Count	24
Starting Page	65
DOI	10.1201/9780138746278-4
Language	English
Publisher	Informa UK Limited
Publisher Date	2020-04-22
Access Restriction	Open
Subject Keyword	Book Name: Multiple Scales of Suspended Sediment Dynamics in a Complex Geometry Estuary Limnology Contaminated Salt Sediment Flux Tidal Prism Increase Ponds Slough
Content Type	Text
Resource Type	Chapter

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