Coast / Estuary

Coastal systems are among the most dynamic physical systems on earth and are subject to a large variety of forces. The morphodynamic changes occurring to coastlines worldwide are of great interest and importance. These changes occur as a result of the erosion of sediments, its subsequent transport as bed load or suspended load, and eventual deposition. 
Estuaries are partly enclosed water bodies that have an open connection to the coast. Estuaries generally have one or more branching channels, intertidal mudflats and/or salt marshes. Intertidal areas are of high ecological importance and trap sediments (sands, silts, clays and organic matter).
Within the Delft3D modelling package a large variation of coastal and estuarine physical and chemical processes can be simulated. These include waves, tidal propagation, wind- or wave-induced water level setup, flow induced by salinity or temperature gradients, sand and mud transport, water quality and changing bathymetry (morphology). Delft3D can also be used operationally e.g. storm, surge and algal bloom forecasting. 
On this discussion page you can post questions, research discussions or just share your experience about modelling coastal and/or estuarine systems with Delft3D FM. 




Sub groups
D-Flow Flexible Mesh
Cohesive sediments & muddy systems


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RE: Results using MorFac

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Results using MorFac
morphological changes morfac
Answer (Unmark)
11/21/17 11:53 AM
Hi all,

I´m just starting to use Delft3D and I´m running a hydromorphodynamic model of an estuary using MorFac. The simulation runs for a period of 30 days plus a MorFac of 12, this is to assess morphological changes after 1 year.

My questions is?

  1. Are the results (hydrodynamic and erosion/deposition) valid for instants between the initial and final time of the simulation? e.g. for a period of 30 days plus a MorFac of 12 the results after 15 days will be valid?

Thank you in advance.


RE: Results using MorFac
Answer (Unmark)
2/12/18 10:26 AMas a reply to Eduardo G-Gorbeña.
Hi Eduardo,

As far as I understand, MorFac methodology is based on the assumption that the magnified morphological effect of some selected sea states can represent the effect of the real sea state time series from which the simulated states where selected.

To me, this means that the only valid result is the one that corresponds to the complete time series period.

So, if you are characterizing your "mean year wave climate" by selecting some representative sea states and repeating them so that their accumulated duration is one month and then multiplying this effect times 12, your minimum time range is one year.
Let's look at an example:
- You are creating a one month duration sea state time series which represents a complete year.
- If your "15 day question" answer was "true", you would be assuming that the wave climate in your first 15 days behaves the same as in your last 15 days. Usually, this assumption is not true, as it would mean that "the first 6 months of your year behave the same as the last 6 months".

I hope that this is useful for you.

Can someone shed some more light on this?