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Showing results for tags 'flow'.
Hello, I have a problem with modelling a small summer discharge of 0.013 m3/s with SRH-2D using an SMS model that has been used before to model the same amount of discharge via Hydro_AS. Looking at the first three monitor lines there is no problem, beside the SRH-2D water arriving earlier. Since the primary objective will be a temperature modelling it is ok for the hydraulics to not align perfectly temporally. However, after the streambed passes by a small lake, that is connected to the stream via two bed ramps that function as an inflow and outflow, additional water seems to appear out of nowhere. Despite the Inflow Boundary Condition at the start of the model area being a constant 0.013 m3/s as well as the inflow BC written in the_SIF.dat-file, a higher discharge gets recorded by the monitor lines downstream of the lake. This happens BOTH when the lake has been pre-filled via the ZONAL approach for Initial Flow Condition Method as well as when it has been left empty/DRY before modelling. Monitor line shows some of the excess water of the pre-filled lake entering the streambed before the discharge of the Inflow Boundary Condition arrives. It is now about 0.022 m3/s instead of 0.013 m3/s. In reality the stream passes through a culvert right after the lake. Since the discharge issues seemed to start there/after the culvert I hoped for an improvement by modelling it as an open channel in SMS. However, no change can be seen in the excel-discharge-graph. Also, the further downstream I go the more the discharge oscillates. Does anyone have an idea why or how this happens and how I could solve this? Kind regards, Hans
Hello to all, i have an issue with a TRANSIENT model that runs WITHOUT PROBLEMS IN MODFLOW for a problem of for years pumping and injecting water within a site. I am now using a STEADY FEMWATER model to simulate a complex stratigraphy present on the unsaturated aquifers that could influence some contamination present in the site due to the presence of clay lenses. The model is well defined the whole conceptual model followed according to the femwater tutorials, the only change is that I am defining the layers top and bottom from solids obtained from stratigraphic data, defining specific clay lenses top/bottom scattered within the site. WHEN I run the check femwater there are no errors, only some warnings regarding the fact that I have some injection wells with positive flow-rate and some areas with recharge equal to zero, the femwater start and then I got the message that I have to change the MAXNPK to 14842, I HAVE NO IDEA WHERE I CAN CHANGE THOSE SETTINGS, seems to be that this is the only issue avoiding my model to run ( i hope so!), does anybody could give a hint to fix this problem? . besides i would also accept other suggestions when using injection and pumping wells within a transient model (not this one but the one i want to set up after this steady-state converges) i REALLY would appreciate your help IN ADVANCE THANKS A LOT ALEXXANDER