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groundwater inflow and treatment

Tue, 05/05/2009 - 12:00pm — Michaela
Hi, I have a lake without any inflow like a river. There is only groundwater inflow, groundwater outflow and sometimes there is a discharge of water to keep up the water level of the lake. The discharge I have defined with the qin_br1.npt (qot_br.npt = 0). The groundwater inflow/outflow is calculated by a seperat groundwater model. The results of these groundwater model I want to integrate in the ce-qual model by the tributary card in the w2_con.npt. I know the segment x has a groundwater flow y with the concentration z. Is this procedural method correct/possible? Next question I have, the lake has a disposal on the bottom which relase NH4. To support the nitification there were installed three deepwater aerations/ventilations. How can I consider the O2-Input in a definite deep? Thanks a lot! Michi
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Hydrodynamics
Wed, 05/06/2009 - 12:57pm — chris

Hi Michi, Yes, you can add groundwater flow to your system using a tributary. Also, you could add a O2 input using the tributary feature. To avoid affecting the water balance, you could have a very low flow rate. The desired O2 loading rate could be obtained by using a very high O2 concentration in the constituent input file. chris
Thu, 05/07/2009 - 4:30am — Michaela

Hi Chris, thank you for your fast reply. But to simulate the hydrodynamic due the deep water ventilation don't I have to use the real inflow rate? I'm not sure whether the deep water ventilation have an effect on the stratification and the hydrodynamic. The inflow rate averages ca. 1.2 m³/s. We have measured the O2-distribution in the waterbody and have seen that the effect of the ventilation reaches only 25 m far from the outlet. To ensure the water balance I would add the "ventilation-inflow-rate" on the qot_br1.npt. What do you think? Michi
Wed, 05/13/2009 - 10:52am — chris

Michi, Definitely use the 1.2 cms flow rate in the tributary file. Adding this flow to the qot_br1.npt file should keep the water balance intact. chris