intro story Coast / Estuary

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



Message Boards

Boundary conditions flow and salinity

Esther Espinoza, modified 3 Years ago.

Boundary conditions flow and salinity

Padawan Posts: 25 Join Date: 4/6/17 Recent Posts
Hi ! I hope you can help me with something:

I am modeling flow and salinity of a estuary and I have some questions about the data that is needed to start:

Sorry if this is to obvious to ask, but I am starting to use the model

1) For boundary conditions: Is it necessary that both boundary conditions, flow conditions and transport conditions for salinity start and finish at the same time and are located in the same points? Also, If the data for flow is hourly the data for salinity should be hourly too or can it be daily ? I mean for example:

Flow: Time Begin End Salinity Time Begin End

28 04 2016 02 00 00 -1.45 -1.45 20 03 2014 10 00 00 33 33

It would be ok the example above? The thing is that the data available are not in the same monitoring stations, so tide and salinity data are from different locations and probably won't match in dates and times.

2) For the bathymetry data, Does it matter if the spacial resolution is 5 m at one specific zone of the grid and 50 m in the outer part, and then 100 m somewhere else? Which is the necessary resolution for this type of area? Is an estuary with internal channels of approximately 2 km of width and increasing its width until ending like a gulf with several km of width in the mouth.

The problem is that the data available doesn't have the same resolution for all the study area, because they just collect data at the navigation channel and in the outter part the resolution is too coarse, maybe like 200 m or more.

3) Do you have any recommendations or advices to start modeling salinity and flow?

Thank you so much for your help!