AquaTellUs

Fluvial-dominated delta sedimentation model

AquaTellUs

true

Contributor(s)

Initial contribute: 2021-09-07

Authorship

:  
University of Colorado
:  
overeem@colorado.edu
:  
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Classification(s)

Application-focused categoriesNatural-perspectiveLand regions
Application-focused categoriesIntegrated-perspectiveRegional scale

Detailed Description

English {{currentDetailLanguage}} English

Quote from: https://csdms.colorado.edu/wiki/Model:AquaTellUs

  AquaTellUs models fluvial-dominated delta sedimentation. AquaTellUS uses a nested model approach; a 2D longitudinal profiles, embedded as a dynamical flowpath in a 3D grid-based space. A main channel belt is modeled as a 2D longitudinal profile that responds dynamically to changes in discharge, sediment load and sea level. Sediment flux is described by separate erosion and sedimentation components. Multiple grain-size classes are independently tracked. Erosion flux depends on discharge and slope, similar to process descriptions used in hill-slope models and is independent of grain-size. Offshore, where we assume unconfined flow, the erosion capacity decreases with increasing water depth. The erosion flux is a proxy for gravity flows in submarine channels close to the coast and for down-slope diffusion over the entire slope due to waves, tides and creep. Erosion is restricted to the main flowpath. This appears to be valid for the river-channel belt, but underestimates the spatial extent and variability of marine erosion processes.

  Deposition flux depends on the stream velocity and on a travel-distance factor, which depends on grain size (i.e. settling velocity). The travel-distance factor is different in the fluvial and marine domains, which results in a sharp increase of the settling rate at the river mouth, mimicking bedload dumping.

  Dynamic boundary conditions such as climatic changes over time are incorporated by increasing or decreasing discharge and sediment load for each time step.

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Irina Overeem (2021). AquaTellUs, Model Item, OpenGMS, https://geomodeling.njnu.edu.cn/modelItem/5f747645-fd2d-4de0-97bf-a229f37e2222
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Contributor(s)

Initial contribute : 2021-09-07

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Authorship

:  
University of Colorado
:  
overeem@colorado.edu
:  
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Is authorship not correct? Feed back

History

Last modifier
HaoCheng Wang
Last modify time
2021-09-07
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