Hi, I'm trying to simulate an estuary (the mouth of a river in the sea) but I can't find any information about the steps to follow to model the river that flows into the sea. I have already simulated the tidal hydrodynamic model in the estuary domain using MOHID Water. Then you should do a hydrodynamic model for the whole (tide + river discharge). Is there a guide with steps to follow for this type of simulations? Where can I find it? The explanations I have found are applied to MOHID Land, land drainage, urban flooding.Thank you.
Hello Gabriel,
Are you simulating a coastal scenario? You can look at setting up such a simulation here: Input wave parameters in a coastal simulation. Have you setup this simulation already?
Do you want to model flooding due to tidal intrusion front?
Can you please elaborate a bit more on what you want to simulate?
Regards,
Yashodhan Joshi
Hello Yashodhan,
Hello. Thanks for your reply. I am trying to simulate the hydrodynamic model at the mouth of a river. This is about a river that flows into the sea and I need to calculate how the river currents interact with the variation in sea level.To accomplish this, I ran a 2D model of the ocean side to get the tide in the river mouth domain. I understood that now I should nest the river simulation, correct? At the moment I don't need to calculate waves.
Hi Gabriel,
Without knowing the details and objectives of your simulation, I can't make many recommendations, but looking now in a little more detail to your grids/bathymetries I see the following:
1) the father grid has many areas that possibly didn't have enough bathymetry data and you've possibly chosen not to extrapolate during the bathymetry interpolation process. This produces many areas where the bathymetry is set to -55 (which is a default in OpenFlows FLOOD for undefined bathymetry value). If you play with the bathymetry color scale and plot all values below zero with a violet color you should see those areas easily, see example below (but there are at least 7-8 areas like this).
2) The son grid does not have sufficient resolution to model the upstream part of the river (see image below). The resolution should allow for adjacent grid cells to share a face. If not flow will not pass from one to the other. Also, the son bathymetry has the same problems in some areas as described in point 1)
Having more details on what you're trying to simulate I could make other suggestions .Maybe use a curvilinear grid for the river?
Hope this helps. Kind regards;Luis
Thank you for your response and I apologize for the delay in my response. I have managed to solve the problem but due to the resolution of the grid, I have not been able to simulate the river. To solve this problem, I have tried to make a curvilinear grid, but the software throws an error that I show below.I will be grateful if you can guide me to solve the problem.
As stated in the error message it looks like the polygon line is not a simple polyline. Check for possible line self-intersections and try to simplify the line where possible. Note that you do not need to give a very detailed outline of the coastline. You only need to delineate the major indents (e.g. tributary rivers, small bays, etc.).
You may find useful information in this article about generating curvilinear grids in OpenFlows FLOOD.
You can always send us the polygon file so we help point out what's causing the problem and how to solve it.
Kind regards,
Luis
Thank you very much Luis for your answer. Here I attach the polygon. Although I have carefully read the instructions for designing a curvilinear grid, there are some details that I have not considered.https://drive.google.com/drive/folders/18F1wsJZmQby4tN0XN_fRZaMMUIHr-vZW?usp=sharing
Because you have some many indents in your polygon line, but you've only identified 4 "turn right" points it gets complicated for the algorithm to generate a fine resolution grid. Try simplifying the polygon line by creating a new one enveloping the river area but with less points and no sharp small turns in direction (e.g. the line looks to follow a gridded format, with sharp 90 degree turns). Please let me know if following those guidelines solves your problem.
Kind regards,Luis