MATH
feflow_user_manual_classic.pdf

From the appearing submenu and close the sub menu

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from the appearing submenu and close the sub- menu clicking OK. Assign a value of - 0,05 m²/d along the northern border choosing the Assign - Border tool and clicking Flux (2nd kind) . The symbols for flux boundary conditions should be dis- played with an additional integral sign. We have to replace time-constant by time-varying boundaries with some constraints: The four wells will get time-varying pumping rates. Activate the Assign - Database option using the same settings as before ( Akima, linear, 3 neighbors, 0% over-/undershooting). This time
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cbcilt SKM `ä~ëëáÅ ö NOV NMKP qÜÉ Oa jçÇÉä import the file well_time_funcs.trp via the Import powerfunction IDs option from the lower right button group. Start the regionalization, click on Well (4th kind), choose ’interactive’, and hit <F2>. The time- varying boundary conditions are set. You can check the settings with the help of the Mesh inspector (zoom in first to locate the node of the well exactly). As the screens of the wells do not reach to the aqui- fer bottom we have to set a potential constraint ensur- ing that well drawdown is limited to the depth of the lower end of the respective well screen. Conversely, a rising water table must not get too close to the ground surface. We thus have to set both a minimum and a maximum potential constraint for each well (zoom- ing in as needed): Click on the arrow at the right of the Well (4th kind) button. The corresponding Constraint condi- tions menu becomes visible. Input the Min and Max constraints and click on the small toggles left of the input fields to acti- vate the settings. Click on Well (4th kind) and assign the constraint to the corresponding well on the mesh (Table 10.1). Repeat the steps for all wells. Leave the Con- straints menu via the arrow but- ton. Check the input by activating the Mesh inspector. If a constraint is set on a well the mes- sage ’time constant constraint behind!’ is displayed in the inspector window. cäçï ã~íÉêá~äë The items of the Flow materials menu have changed with the problem class. Assign Conductivity and Aquifer top- and bottom elevation by importing and regionalizing the corre- sponding data via the Assign - Database tool ( Akima interpolation, linear, 0% over-/ undershooting, import time-constant data): conduc2d.trp conductivity relief.trp aquifer top elevation bot_san2.trp aquifer bottom elevation The groundwater recharge varies over time. The set- ting of the values is therefore a little different than before: We want to import the values directly from a database. We will use a polygon file as template and link it with a database which contains the groundwater recharge values for different times. Select the Join tool from the scroll list below the mesh inspector icon, Choose Polygon from the small Join menu.
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