Menyanthes User Manual - KWR Watercycle Research Institute

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8 Simulating groundwater level series8.1 Running a simulationUsing a time series model, a groundwater level series can be simulated over any period basedon data on the explanatory series and their estimated response. The simulation period may forexample be longer than the calibration period, or have a higher frequency or fill in gaps of theoriginal observations. To start a simulation, select one or more models in the model quadrantand press Simulate. Hereafter, the simulation window opens (Figure 18) in which a number ofoptions are available. These options can be set for each individual model or for several modelssimultaneously and are the:• Simulation period – restricted to the period over which data from all explanatory seriesis available• Simulation interval – time step between two simulated levels• Selected series – explanatory series that are used for the simulation• Threshold drainage – for nonlinear time series models groundwater levels can besimulated with or without the effect of local drainage systems.• Stochastic simulation – determines whether the stochastic part of the model is used forthe simulation.• Number of realizations – here you can chose the number of stochastic simulations youwant to do for each model.Figure 18 The simulation windowWhen the Simulate button is pressed, the simulation is performed for all models. When youpress Save the simulated series are stored in the Observation Wells quadrant of the mainwindow. By saving the simulation as a groundwater level series, all functions that are availablefor normal groundwater level series, like Statistics, can also be applied to the simulatedMenyanthes Manual© KWR - 33 -
groundwater level series. With Export the simulation results, including the 95% confidenceintervals, are saved to a .csv file and opened in ExcelNote:- Linear trends are not extrapolated outside the period for which they were estimated.- Make sure that you can distinguish simulated from actual measured series. Menyanthes usesthe suffix _sim by default for simulated series.8.2 Further interpretation of groundwater levels: Vegetation Reference ModuleThe groundwater level and it fluctuations may have a strong influence on vegetation. Menyanthes offersinsight whether specific vegetation may grow for the simulated groundwater levels. The acceptablegroundwater levels for a wide range of vegetation is accessible using the ‘Edit Vegetation Tolerancebutton . This opens the ‘Vegetation Reference Module’ window, which has two tabs: ‘Limburg’ and‘Staatsbosbeheer’.Both tabs show a list of vegetation types on the right and the tolerance of the selected vegetation type onthe right. The vertical axis gives the groundwater level with respect to the surface elevation (positive isgroundwater ponding; negative values indicate a groundwater level below the surface). The horizontalaxis is the frequency which is tolerable for the vegetation type that the the groundwater level exceeds thegiven value. The red lines in the graphs give an indication of the band width of the tolerance.Figure 19 The Limburg tab of the Vegetation Reference ModuleThe vegetation type tolerances provided by the Dutch Province of Limburg are defined by an upper andlower limit. Each limit is defined by three points. The point can be edited by the user.Menyanthes Manual© KWR - 34 -
Page 2 and 3: Menyanthes User ManualVersion 2.x.b
Page 4 and 5: ContentsContents 11 Introduction 41
Page 6 and 7: 10 List of references 47I Appendix
Page 8 and 9: - Improved output at different scre
Page 10 and 11: 2 Technical specifications andrequi
Page 12 and 13: 3 The installation procedure3.1 Ins
Page 14 and 15: Since then, Menyanthes also require
Page 16 and 17: New - open a new databaseOpen - fin
Page 18 and 19: 4.5 The ‘Explanatory Series’ se
Page 20 and 21: 5 Database and graphic functionalit
Page 22 and 23: pumping well or other explanatory s
Page 24 and 25: Figure 8 Module for editing the tec
Page 26 and 27: 6 Groundwater statistics6.1 The sta
Page 28 and 29: • Simulated series are affected b
Page 30 and 31: 7.1.1 Options in the Groundwater Le
Page 32 and 33: 2) Values of the explanatory series
Page 34 and 35: plotted, together with the estimate
Page 39 and 40: Figure 22 the two tabs of the Spati
Page 41 and 42: 1. Enter the barametric datalogger
Page 43 and 44: The three section of the Diver Data
Page 45 and 46: Figure 25 Screen to get a detailed
Page 47 and 48: Figure 26 The edit screen for datal
Page 49 and 50: Figure 27 Screen to edit technical
Page 51 and 52: I Appendix A: Description of import
Page 53 and 54: length of the sediment sump of the
Page 55 and 56: 2. Go the menu and to Tools > Digit
Page 57 and 58: M0 PRECSDEVEVAP FWELL NAMEM0 WELL-
Page 59 and 60: IV Appendix D: Data structure in MA
Page 61 and 62: V Appendix E : AcknowledgementsFina
Page 63: Postbus 1072 3430 BB Nieuwegein The

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