W2 Forum - Water Quality

pH Computation

Saber — Sun, 05 Jul 2020 06:29:49 +0000

I wanna model pH in my reservoir, yet in the Active Constituent section, I have turned on TIC = pH. Of course, I have turned on pH on the Derived constituent computations. I was wondering if turning TIC to pH means that I can use pH data for inflow instead of TIC and the initial concentration also turns into pH?? I have searched the user manual thoroughly yet all I have found was information about when the TIC is ON and the fact that TIC means total inorganic carbon mg/l as C.

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Water Quality

Turbidity Modelling

Saber — Sat, 04 Jul 2020 05:47:40 +0000

The new version of the model can stimulate turbidity in the water column. I have tried the sediment diagenesis module, yet I have to modify the SOD in my reservoir to Zero. I have spent a lot of time calibrating the SOD in my reservoir also, I need to model the turbidity in this waterbody. Is there any way that I can model turbidity and keep my calibration data?

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Water Quality

Algae modeling

Tran — Fri, 12 Jun 2020 10:35:29 +0000

Hi everyone, I am looking for a model which simulates more than 3 algal groups. Can anyone name some papers or technical reports related? Thank you so much, Tran

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Water Quality

Time series constituents output

Hanief — Sat, 11 Apr 2020 13:51:23 +0000

I have a running model and have set the time series output for one segment at various elevations. Bathymetry has 1m depths for all segments For the time series output i have set ESTR to the surface layer (o) and layer 10 (ESTR=-10) which corresponds to 1500m. The model runs but when the water level drops below 1499m (surface elevation) i am still getting output for constituents at layer 10 (1500m). Surely I should only be getting output at the surface? Is layer 10 fixed as 10 layers below the surface layer or is it fixed at 1500m? Am i understanding ETSR correctly as the layer in the bathymetry file and its corresponding depth?

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Water Quality

hypolimnetic aeration

Kellie Vache — Thu, 26 Sep 2019 22:02:47 +0000

I am using the hypolimnetic aeration algorithms to explore the value of an aeration system on DO, but I'm also interested in potential changes in pH associated with the CO2 that would come along with the O2. Am I correct that the algorithm adds oxygen, not air/C, and so won't project any changes in the carbonate model? If that's the case, would there be utility in also adding CO2? Thanks for any thoughts on this, Kellie

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Water Quality

Derived Constituents

Hanief — Sun, 28 Apr 2019 06:34:46 +0000

Does anyone know how to view the derived constituents (CST DERI) using the Post Processor?? I would really know what is happening to some of those constituents and since the runs are long it is not efficient to use the Output Control. Years ago I remember that Loginestics's AGPM could output Algal production, chl-a, pH etc as well (but you paid for it)

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Water Quality

Modelling pathogens/protozoa (Giardia)

Hanief — Thu, 07 Mar 2019 08:00:38 +0000

I am struggling to find a state variable that would represent non-motile protozoans. What i require is to represent them would involve the transport, death/decay, sedimentation and resuspension. If one models them as generic constituent (coliform) then no resuspension is accounted for. If they are modelled as suspended solids then there is no decay/death. Is there any way to include both mechanisms?

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Water Quality

CBOD and BOD

Ibrahim — Wed, 10 Oct 2018 05:03:14 +0000

hi everyone, maybe my question is easy. in the active constituent's of the model the CBOD parameter is exist. But I want to simulate BOD. I don't know how to simulate this. please help me.

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Water Quality

I have a problem with wind direction

MostafaS — Wed, 09 May 2018 08:01:04 +0000

Hi, I have a problem with wind direction. When I consider the direction of the wind in the same direction of flow in the reservoir, the concentration of pollution is decreasing, while it should increase. I ask you to answer that this problem is related to Which part? thank you

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Water Quality

New reservoir to the system

JuanA — Tue, 27 Feb 2018 13:38:05 +0000

Good morning to all, I have the following concern I have a model that has 6 reservoirs connected. The reservoir (1) pumps water to the reservoir (2). the model runs normally, but now I want to add a seventh reservoir, but at the moment of running I get this error: "Upstream pump elevation [EPU=134.000] > layer 2 for pump 6 Upstream elevation for turning pump on [EONPU=136.000] < layer 2 for pump 6 Upstream elevation for turning pump off [EOFFPU=134.000] < grid top elevation for pump 6" please help me with this doubt. Thank you

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Water Quality