Multiple Scales of Suspended Sediment Dynamics in a Complex Geometry Estuary

Fernanda Minikowski Achete

• Publisher: CRC Press
• Year: 2020
• ISBN:
  9780429611506
• Edition: 1
• Topic: Physical Sciences
• Subtopic: Geology & Earth Sciences

Many estuaries are located in urbanized, highly engineered environments. Cohesive sediment plays an important role due to its link with estuarine health and ecology. An important ecological parameter is the suspended sediment concentration (SSC) translated into turbidity levels and sediment budget.
This study contributes to investigate and forecast turbidity levels and sediment budget variability at San Francisco Bay-Delta system at a variety of spatial and temporal scales applying a flexible mesh process-based model (Delft3D FM). It is possible to have a robust sediment model, which reproduces 90% of the yearly data derived sediment budget, with simple model settings, like applying one mud fraction and a simple bottom sediment distribution. This finding opens the horizon for modeling less monitored estuaries.
Comparing two case studies, i.e. the Sacramento-San Joaquin Delta and Alviso Slough, a classification for estuaries regarding the main sediment dynamic forcing is proposed: event-driven estuary (Delta) and tide-driven estuary (Alviso Slough). In the event-driven estuaries, the rivers are the main sediment source and the tides have minor impact in the net sediment transport. In the tide-driven estuaries, the main sediment source is the bottom sediment and the tide asymmetry defines the net sediment transport.
This research also makes advances in connecting different scientific fields and developing a managerial tool to support decision making. It provides the basis to a chain of models, which goes from the hydrodynamics, to suspended sediment, to phytoplankton, to fish, clams and marshes.

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Dedication
• Acknowledgments
• Summary
• Samenvatting
• Resumo
• Table of Contents
• 1: General Introduction
• 2: A 2d Process-Based Model for Suspended Sediment Dynamics: A First Step Towards Ecological Modeling
• 3: Suspended Sediment Dynamics in a Tidal Channel Network Under Peak River Flow
• 4: Impact of a Sudden Tidal Prism Increase in Estuarine Sediment Flux: Implications to Remobilization of Hg-contaminated Sediment
• 5: How Important are Climate Change and Foreseen Engineering Measures on the Sediment Dynamics in the San Francisco Bay-delta System?
• 6: Conclusions
• 7: References
• Exposure
• Biography
• Sense Diploma