Modelling Rivers


Rivers are natural water courses. They have vital contributions to the social and economical welfare of societies living along their course. They provide continuous, usually dependable, flow and supply of water. Accordingly, centralised civilisation began emerging independently along number of river valleys; e.g. the Nile, Tigris and Euphrates, the Indus and the Yellow Rivers. Since then, mankind has been in continuous struggle to understand and live in harmony with this gift/force of nature. Modelling rivers is the modern way to understand their behaviour and is an essential tool to tackle several river problems.

Delft3D is the state-of-the-art modelling framework for hydrodynamics, water quality, ecology, waves and morphology.
Here, in this space, we share knowledge & experiences, and discuss issues related to modelling of rivers.





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


Message Boards

map-file time inconsistency

Jacob Morgan, modified 3 Years ago.

map-file time inconsistency

Youngling Posts: 5 Join Date: 7/31/15 Recent Posts
I am having an interesting issue restarting from map-files that I am not sure if others have experienced (or if they have I have not found any threads about it).

I have a series of morphodynamic simulations that I need to restart from previous map-files. In the original simulations the reference time started on the hour and map-files were specified to be updated every ten minutes (my timestep, 0.0005 min, should allow this). When I look at the map-files though the times associated with them are not exactly at ten minute intervals. They are off by very small fractions of a second. Because of this, I am unable to restart from them. When I put in the time on the ten minute interval that they should be I get an error saying that restart time is not found on the map-file. When I do put in the exact time associated with the map-file I get an error saying that the restart time is not a multiple of the time step.

1. What could be the cause of this? Does it have something to do with the simulation time (100 hrs) being too long for a single reference date?

2. Is there a way to proceed from this point and use the map-files I already have? For example, is there a way to change the timestamp associated with the outputs in a map-file to be either on the ten minute interval or at least a multiple of my timestep?

I would appreciate any help!

William Smith, modified 12 Days ago.

RE: map-file time inconsistency

Youngling Posts: 1 Join Date: 3/26/20 Recent Posts
ya sir i read your whole qstn i need some time to explain it because im stuck right now in other things PrepaidGiftBalance