User:Jcreer/SMS:GSSHA Model Control

General

• Total time (TOT_TIME) – Enter an integer giving the total duration of the simulation in minutes
• Time step (TIMESTEP) – Enter an integer giving the duration of each time step in the simulation in seconds. The time step must be evenly divisible into 60 seconds (e.g., 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, or 60 seconds).
• Outlet slope (OUTSLOPE) – Enter an integer for the slope of the cell containing the watershed outlet. This must be a positive decimal number.

Overland Flow

• ELEVATION dataset –
  • Select – Opens Select dataset for ELEVATION dataset dialog. Must specify one for use in model.
• Solver(OVERTYPE) – Select one of the two following options from dropdown. Check any of the four following options if applicable.
  • "ADE" – Alternating Direction Explicit method.
  • "ADE-PC" – Alternating Direction Explicit Predictor-Corrector method. Completes most slowly, but is the most robust.
• ROUGH_EXP –
• INTERCEPTION – If selected, will use interception using data present in the Mapping Table file
• RETENTION –
• AREA_REDUCTION –

Infiltration

• Infiltration type – Select the method for calculating infiltration type from the drop down menu.
  • "No infiltration" – Select in order to not calculate any infiltration.
  • "Green & Ampt w/ soil moisture redistribution (INF_REDIST)" – Specifies infiltration calculations using Green and Ampt with Redistribution method - redistributes soil moisture during periods of no- or low- intensity rainfall
    • Soil moisture depth (SOIL_MOIST_DEPTH) –
    • Top layer depth (TOP_LAYER_DEPTH) –
  • "Green & Ampt multilayer (INF_LAYERED_SOIL)" – Specifies three layered Green and Ampt infiltration
    • Soil moisture depth (SOIL_MOIST_DEPTH) –
  • "Richards' infiltration (INF_RICHARDS)" – Select when using Richards' equation to simulate infiltration.
    • Weight (RICHARDS_WEIGHT) – Used to determine how much weight is placed on upper and lower cells using the arithmetic weighting method for calculating inter-cell hydraulic conductivities.
    • DTHETA MAx (RICHARDS_DTHETA_MAX) – Specifies maximum water content change allowable. Default value = 0.025.
    • C option (RICHARDS_C_OPTION) – Hydraulic conductivity and water capacity values dependent on water content of each cell. Select either brooks or havercamp
    • K option (RICHARDS_K_OPTION) – Inter-cell hydraulic conductivity weighting method - ARITHMETIC or GEOMETRIC
    • Upper option (RICHARDS_UPPER_OPTION) – Selections here compute the hydraulic conductivity at the ground surface - either green_ampt ( or average
    • Max Iteration (RICHARDS_ITER_MAX) – Maximum number of iterations specified by the user. Default = 1.
    • Max num. cells (MAX_NUMBER_CELLS) –
    • Soil moisture depth (SOIL_MOIST_DEPTH) – A decimal depth value in meters.

Channel Routing

• Channel routing computation scheme –
  • "No routing" –
  • "Diffusive wave (DIFFUSIVE_WAVE)" –
    • Allow overbank flow (OVERBANK_FLOW) –
    • Allow overland backwater (OVERLAND_BACKWATER) –
    • Outlet head BC (HEAD_BOUND / BOUND_DEPTH) – A decimal value in meters
    • Create hot start file – Check box to save a file containing soil moistures for every grid cell in the watershed after the simulation has run.
    • Start from hot start file – Check box in order to select a file containing starting surface moisture data for every grid cell in the watershed
    • Soil erosion (SOIL_EROSION) – Allows user to calculate overland soil erosion.
      • Sediment porosity (SED_POROSITY) – Enter the value of the porosity of the channel bed sediments. This value must be between 0.0 and 1.0. The default is 0.25.
      • Water temperature (WATER_TEMP) – Enter the value of the water temperature
      • Sand size (SAND_SIZE) – Enter the value of the representative grain-size of the sand.
    • Compute containment transport –
      • Decay coefficient (CHAN_DECAY_COEF) –
      • Dispersion coefficient (CHAN_DISP_COEF) –
      • Initial concentration (INIT_CHAN_CONC) –

Output – General

• Dataset write frequency (MAP_FREQ) –
• Hydrograph write frequency (HYD_FREQ) –
• Output units –
  • "English (QOUT_CFS)"
  • "Meters (METRIC)"
• Suppress screen printing (QUIET) –
• Suppress long term simulation printing (SUPER_QUIET) –
• Strict Julian dates (STRICT_JULIAN_DATE) –
• Output contaminants (ALL_CONTAM_OUTPUT) –