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Found 7 results

  1. Hi all, I am not a constant user of GMS so I am often re-learning data processing techniques. I am looking for help with a procedure to accomplish the following objective. I have a 10 layer, steady state flow model of a coastal plain. The top layer predominantly represents a confining clay layer (material 1 in brown) with several small discontinuous regions where the underlying aquifer is exposed (material 2 in green) and some inactive regions (in red). Regions where the underlying aquifer are exposed have specified values for recharge (using polygon feature objects derived from shapefile). Other BC's are defined on the top layer: (CHD for ocean - in cyan; rivers in blue; drains appearing only in material 2 - not shown). I would like to specify a constant head in layer 1 equal to (TOP-1m) for every cell where clay is present but not interfere with other BCs subject to the following constraints: If (TOP -1) > BOT, Constant head = TOP - 1 Else Constant head = BOT + (TOP - BOT) * 0.1 Any help on a process for accomplishing this task would be greatly appreciated. Thanks Ted
  2. Greeting, I will like to know how GSSHA handles the variable stage (water surface elevation) boundary conditions. Does the GSSHA water depth results for a cell are being forced with this overland flow boundary condition if the feature point is located within the same cell or the boundary condition is being applied at the cell and GSSHA is allow to compute the hydrodynamics for this cell? In other words, does the GSSHA water depth results will be identical to the boundary condition applied at the same cell. Also, what does GSSHA does between the variable stage overland boundary condition? Does it compute the hydrodynamics at each time step for the boundary condition or does it linearly interpolate between boundary condition steps? For example, if the time step of my boundary condition is 5 minutes but the computational time step of GSSHA is 1 sec, does GSSHA computes the hydrodynamics each 5 minutes using the latest boundary condition data or does it interpolate the values between each 5 minutes? Any comments or feedback will be greatly appreciated. Please feel free to ask any question if my doubt was not clear. Thanks in advance,
  3. Hello, Has anyone run into issues using the "link" boundary condition type, specifically with the SRH-2D preprocessor stalling when a link boundary condition type is used? Thanks!
  4. Hey all! I have a question regarding boundary condition set up. I am working on a regional model of an large aquifer field which is used for drinking water purposes. Hydrologic and hydrogeologic conditions are at this stage of the research verry clear. We are dealing with open aquifer field where boundary condition is representing inflow to the aquifer from surrounding sedimentary formations. We have calculated the infow using National groundwater recharge model and at this stage we have data of infow (Q [m^3/s]) for every cell of the boundary condition. Is it possible to calculate the needed hydraulic head in order to simulate the boundary conditions as constant head?
  5. AKRF

    SRH-2D Error

    We are using SRH-2D to model a proposed channel cut in a river. The inlet boundary condition we're using is a variable flow rate with positive and negative values as we have a tidal flow condition. When I run the model, I receive the error shown below. It seems like the negative flow rates are the source of the error. Does anyone know how to allow for negative flow rates in SRH-2D?
  6. Has anyone experienced gaps in boundary conditions (not all cells along a boundary arc are being assigned the boundary condition) with MODFLOW-USG or after converting a structured grid to an unstructured grid? What could be causing this problem? Greg
  7. karunakar

    Node strings

    hello there, of recent i've encountered a typical problem. i've built a mesh for a domain and done a lot of manual editing on it. unknowingly i've lost the land boundary node string, i've tried changing colors, but of no use. ocean nodestring is visible in blue. so 'm sure land node string is gone. is there any automated way to get it back (please don't suggest i've to manually do it). Thanks in advance, great day. --karunakar kintada Scientist
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