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intro story DELWAQ


DELWAQ is the engine of the D-Water Quality and D-Ecology programmes of the Delft3D suite. It is based on a rich library from which relevant substances and processes can be selected to quickly put water and sediment quality models together.

The processes library covers many aspects of water quality and ecology, from basic tracers, dissolved oxygen, nutrients, organic matter, inorganic suspended matter, heavy metals, bacteria and organic micro-pollutants, to complex algae and macrophyte dynamics. High performance solvers enable the simulation of long periods, often required to capture the full cycles of the processes being modelled.

The finite volume approach underlying DELWAQ allows it to be coupled to both the structured grid hydrodynamics of the current Delft3D-FLOW engine and the upcoming D-Flow Flexible Mesh engine (1D-2D-3D) of the Delft3D Flexible Mesh Suite (or even other models such as TELEMAC).

'DELWAQ in open source' is our invitation to all leading experts to collaborate in further development and research in the field of water quality, ecology and morphology using Delft3D. Feel free to post your DELWAQ related questions or comments in this dedicated forum space. If you are new to DELWAQ, the tutorial (in the user manual) is a good place to start. A list of DELWAQ related publications is available here.




Sub groups
D-Flow Flexible Mesh

Cohesive sediments & muddy systems


Message Boards

undefined symbol: julian_

Ata Roudgar, modified 12 Months ago.

undefined symbol: julian_

Youngling Posts: 2 Join Date: 1/24/19 Recent Posts

Hi, I have compiled delft3d-63181 successfully but when I run the first example, 01_standard I get an error:  d_hydro ABORT: Cannot load component library "libflow2d3d.so": /home/aroudgar/src/delft3d/install/lib/libflow2d3d.so: undefined symbol: julian_

command "nm" also confirms that such symbol is not defined in libflow2d3d.so.


$ nm /home/aroudgar/src/delft3d/install/lib/libflow2d3d.so | grep julian_

000000000074d7e0 T diodeltatimestring2julian_
0000000000735700 T dio_ds_mp_diodstimestring2julian_
0000000000737820 T dioftimestring2julian_
0000000000742260 T dio_plt_rw_mp_diopltdefautowithjulian_
00000000007423d0 T dio_plt_rw_mp_diopltdefinewithjulian_
000000000074d390 T diotimestring2julian_
00000000008cf240 r diotimestring2julian_$MONLEN.0.3
                U julian_
0000000000c27f60 D time_modulecalendaryearmonthdaytojuliandatenumber_mp_justafterlastjulian_

Any suggestion?