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Sediment dynamics and deposits along the fluvial–marine transition: Tidal river to mangrove coast
Rivers supply the vast majority of sediment that reaches the global ocean. As many rivers approach the sea, they experience tidal influence in the absence of salinity, along a reach known as the tidal river. As a result, a significant fraction of the sediment discharged by rivers around the world passes through a tidal river ...
Investigating sediment transport on the Waipaoa margin: linking in situ observations with preserved deposits
Connecting the processes that control sediment transport to the deposits they leave behind is critical for understanding sedimentary system dynamics on modern timescales. Small mountainous river systems (SMRs) have been the focus of intense investigation for several decades, as they provide an ideal setting in which to study ...
Fjord sedimentation during the rapid retreat of tidewater glaciers: observations and modeling
Ice-ocean interactions remain poorly understood despite the growing recognition that they play significant roles in the complex behavior of glaciers that reach the oceans, which is of broad interest because it contributes substantially to the challenge of predicting global sea-level rise. This research focuses on the dynamics ...
Sediment dynamics in tidal environments spanning a range of fluvial influence
A full understanding of the transport of sediment from terrestrial source to marine sink requires knowledge of dynamics in a multitude of intermediate environments with both fluvial and marine influences. Two of these environments, tidal flats and tidal rivers, are dramatically different in scale and setting but are unified ...
Sediment dispersal and accumulation in an insular sea: deltas of Puget Sound
(2014-02-24)
Small rivers carry several million tons of sediment annually into Puget Sound and the Strait of Juan de Fuca. Once delivered to the marine environment, processes in the water column and on the seabed dictate dispersal, deposition and accumulation of these particles. To investigate these mechanisms, water-column measurements, ...
Processes and records of coastal sediment dispersal in contrasting deltaic systems
Rivers are responsible for most sediment delivery to the ocean, and at the river-ocean transition, a complex set of processes and pathways shape the ultimate fate of particulates. Conceptual and numerical models of fluvial-marine dispersal have become increasingly sophisticated through several decades of observational and ...
The Thermal and Fluid Environment of the Cascadia Subduction Zone, Southern Washington State
Subduction zones are areas of tectonic plate collision that produce associated earthquakes and destructive tsunamis and, in addition, provide a link between the atmosphere and ocean. Mapping the thermal and fluid circulation of an active subduction zone can advance our understanding of subduction zone dynamics and fluid ...
Fine-Grained Sediment Dynamics and Morphodynamics in Tide-Dominated Channels
Rivers supply the bulk of sediment to the world ocean and are, therefore, crucial in building the foundation of coastal ecosystems and communities. As rivers approach the ocean, sediment dispersal can become dominated by tidal processes, and much sediment is trapped within delta distributary channels. Sediment that is discharged ...
The response of seep and methane hydrate biogeochemical systems to variability in climate, hydrogeology, and trace metal availability
Cold seeps are seafloor manifestations of fluid flow from deeper within marine sediments, and they are often locations where methane discharges into the ocean. These dynamic environments are typically found along continental margins and serve as biological oases for specialized seafloor macro- and meio-fauna as well as seafloor ...
Connecting sediment dynamics to coastal morphology over linked spatial and temporal scales in Myanmar and New Zealand
Low-lying coastal environments are threatened by sea-level rise (SLR), which is often locally exacerbated by anthropogenic alterations that accelerate subsidence. Managing and protecting these valuable regions requires understanding the fundamental sedimentary processes that build coastal landforms. This thesis presents four ...