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Delft3D_NetCDF_Output_overview.md

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Delft3D NetCDF output keywords

NetCDF output in Delft3D-FLOW can be toggled by setting the FlNcdf = #maphis# in the .mdf file.

Vector components

Keywords set Description Dimensions U/ $\xi$ Dimensions V/ $\eta$
U1, V1 U, V velocity per layer in U, V point (time, KMAXOUT_RESTR, MC, N) (time, KMAXOUT_RESTR, M, NC)
SBUU, SBVV Bed-load transport in u,v-direction (u point) (v point) (time, LSEDTOT, MC, N) (time, LSEDTOT, M, NC)
SSUU, SSVV Suspended-load transport in u,v-direction (u point) (v point) (time, LSED, MC, N) (time, LSED, M, NC)
TAUKSI, TAUETA Bottom stress in U,V - point (time, MC, N) (time, M, NC)
SBUUA, SBVVA Stat stuff: Average bed-load transport (avgtime, LSEDTOT, MC, N) (avgtime, LSEDTOT, M, NC)
SSUUA, SSVVA Stat stuff: Average suspended-load transport (avgtime, LSEDTOT, MC, N) (avgtime, LSEDTOT, MC, N)

Bottom surface properties

Keyword Description Dimensions
DM Arithmetic mean sediment diameter (time, M, N)
DG Geometric mean sediment diameter (time, M, N)
DMSEDCUM Accumulated net sedimentation over the period between two map-file output times $\frac{kg}{m^2}$ (time, LSEDTOT, M, N)
TAUKSI, TAUETA Vector comps; Bottom stress in U,V - point (time, MC, N)

Underlayer properties

Keyword Description Dimensions
MSED Mass of sediment in layer (time, LSEDTOT, nlyr, M, N)
LYRFRAC Volume fraction of sediment in underlayer (time, LSEDTOT, nlyr, M, N)
DP_BEDLYR Vertical position of sediment layer interface (time, nlyrp1, M, N)

Constants

Keyword Description Dimensions
GRAVITY Gravitational acceleration constant $\left(\frac{m}{s^2}\right)$ -
RHOCONST User specified constant density $\left(\frac{kg}{m^3}\right)$ -

Attributes, grid and coordinates

Keyword Description Dimensions
grid Attributes describing SGRID
DPS Bottom depth at time (sigma point) (time, M, N)
DP0 Initial bottom depth (positive down) (MC, NC)
NAMCON Name of constituent quantity (eg sediments, solvents, tracers) (LSTSCI)
NAMTUR Name of turbulent quantities (eg Turbulent energy, Energy dissipation) (LTUR)
SIG_LYR Sigma-coordinates of layer centres -
SIG_INTF Sigma-coordinates of layer interfaces -
LSTSCI Array of indices for constituents (eg sediments, solvents, tracers) -
LSEDTOT Array with indices for sediments (total?) -
LSED Also array with indices of Sediments, no idea what the difference between this and LSEDTOT is ¯_(ツ)_/¯ -
KMAXOUT User selected output layer interfaces -
KMAXOUT_RESTR User selected output layer centres -
time List of datetimes of output time-steps following CF conventions (time)
XZ X Meshgrid of face coordinates -
YZ Y Meshgrid of face coordinates -
XCOR X-coordinate of grid points (ie the grid nodes) -
YCOR Y-coordinate of grid points (ie the grid nodes) -
M face dimensions (M:MC (padding: low) -
N face dimensions (N:NC (padding: low)) -
MC node dimensions -
NC node dimensions -
nlyr Number of underlayer -
nlyrp1 Interfaces of underlayers -

Various

Keyword Description Dimensions
GSQS Horizontal area of computational cell (M, N)
RHO Density per layer in sigma point (time, KMAXOUT_RESTR, M, N)
R1 Concentrations per layer in sigma point (time, LSTSCI, KMAXOUT_RESTR, M, N)
WPHY W-velocity per layer in sigma point : sediment fall velocity? (m/s) (time, KMAXOUT_RESTR, M, N)
W W-omega per layer in sigma point : wave angle? [ω is the vertical velocity relative to the σ-plane] (time, KMAXOUT, M, N)
WS Settling velocity per sigma-layer (time, LSED, KMAXOUT, M, N)
S1 Water-level in sigma point (time, M, N)
DPS0 Initial bottom depth at sigma points (positive down)
DPU0 Initial bottom depth at u points (positive down)
DPV0 Initial bottom depth at v points (positive down)
ALFAS Orientation ksi-axis w.r.t. pos.x-axis at water level point
PPARTITION Partition (???) (M, N)
TAUMAX Tau_max in sigma points (scalar) ie max bottom stress $\frac{N}{m^2}$ (time, M, N)
UMNLDF Filtered U-velocity (time, MC, N)
VMNLDF Filtered V-velocity (time, M, NC)
MORFAC Morphological acceleration factor (MORFAC) (time)
MORFT Morphological time (days since start of simulation
MFTAVG Morphological time (days since start of simulation) (avgtime)
MORAVG Average MORFAC used during averaging period

Stat stuff

These can be toggled in the morphology file under output with

StatWaterDepth = MIN MAX MEAN STD StatVelocity = MIN MAX MEAN STD StatBedLoad = MIN MAX MEAN STD StatSuspload = MIN MAX MEAN STD

Keyword Description
MIN_H1 Minimum water depth
MAX_H1 Maximum water depth
MEAN_H1 Mean water depth
STD_H1 Standard deviation of water depth
MIN_UV Minimum velocity
MAX_UV Maximum velocity
MEAN_UV mean velocity
STD_UV Standard deviation of velocity
STD_SSUV Standard deviation of total suspended transport
MIN_SBUV Minimum total bedload transport
MAX_SBUV Maximum total bedload transport
MEAN_SBUV Mean total bedload transport
STD_SBUV Standard deviation of total bedload transport
MIN_SSUV Minimum total suspended transport
MAX_SSUV Maximum total suspended transport
MEAN_SSUV Mean total suspended transport

Masks

Keyword Description
KCS Non-active/active water-level point
KFU Non-active/active in U-point
KFV Non-active/active in V-point
KCU Mask array for U-velocity points
KCV Mask array for V-velocity points

Turbulence modelling

Vorticity and enstrophy can be toggled Vortic = #Y# in the .mdf file

Keyword Description Dimensions
RTUR1 Turbulent quantity per layer in sigma point (1. Turbulent Kinetic Energy $k$ and 2. Turbulent energy dissipation $\epsilon$) (time, LTUR, KMAXOUT, M, N)
VICWW Vertical eddy viscosity-3D in sigma point (time, KMAXOUT, M, N)
DICWW Vertical eddy diffusivity-3D in sigma point (time, KMAXOUT, M, N)
RICH Richardson number (time, KMAXOUT, M, N)
VICUV horizontal eddy viscosity in zeta point (time, KMAXOUT_RESTR, M, N)
RCA Near-bed reference concentration of sediment (time, LSED, M, N)
VORTIC Vorticity at each layer in depth point $\frac{1}{s}$ (time, KMAXOUT_RESTR, MC, NC)
ENSTRO Enstrophy at each layer in depth point $\frac{1}{s}$ (time, KMAXOUT_RESTR, MC, NC)