CASC2D-SED Input/output files

CASC2D-SED INPUT/OUTPUT

Model input and output files are defined in a Project file. The project file name represents the argument of the CASC2D-SED program. The list of input/output files and their definition is found in Table 1 and Table 2 below. An example of a project file is found in Appendix III.

Input Files

Required CASC2D inputs and options are:

(1) Simulation control data: computational time step, simulation duration, and number of rows and columns and cell size of the grid.

(2) Precipitation data: precipitation duration and a) if uniform rainfall, the intensity or b) number of raingages, rainfall data time step, and rainfall gages UTM coordinates if distributed rainfall.

(3) Basin outlet characteristics: a) row, column and overland slope of the basin at the outlet and b) link characteristics if channel routing is selected: (link number, total nodes, type, width, depth, side slope, roughness and sinuosity)

(4) Soil parameters: number of different soil types, and a) if infiltration occurs: hydraulic conductivity, suction head, and moisture deficit and b) if erosion option is selected: percentages of sand, silt and clay in soil and USLE soil erodibility factor.

(5) Land use parameters: number of different soil uses, roughness coefficient and interception depth and, if erosion option is selected: USLE cover and management practice factors.

The input files are: the simulation control file (specifying parameters defined in the last 5 paragraphs), channel data file, and precipitation file (if distributed rainfall is used). Input as raster ASCII maps are: DEM, soil index, land use index, watershed mask, and channel links and nodes (if channel routing is selected). The storage depth ASCII grid is an optional input grid.

Examples of input files can be found in Appendix III.

Output Files

CASC2D-SED creates the next output files:

(1) Summary file: contains information on the simulation parameters, channel topology inferred from the link and node maps and the final results of the hydrological and erosion components.

(2) Flow and sediment flow files: containing the water flow [m3/s] and sediment flow [m3/s] at the outlet. Results can optionally be written at other internal locations inside the watershed.

(3) Time-series grids: They are optional and represent simulation values at predetermined times. Output raster maps include: water depth, rainfall rates, accumulated infiltrated depth, total sediment volume, suspended sediment volume, and sediment flux and concentration by size fraction. Time series maps can be later used as input in an animated file.

Examples of CASC2D-SED output files can be found in Appendix III.

Table 1: CASC2D-SED input and output text files

	*Project name*	*File variable*	*Description*
*Input Text Files*	CONTROL	control_file	Controls the simulation.
	PRECIP	rain_file	Precipitation data if gages are present [in/hr]
	CHANNEL	chn_file	Channel characteristics data for each link and node.
*Output Text Files*	SUMMARY	Summ_file	Simulation summary file
	DISCHARGE_OUT	dis_out_file	Hydrograph at outlet and, if selected, at internal locations [m³/s]
	SEDIMENT_OUT	sed_out_file	Sedigraph at outlet and, if selected, at internal locations [m³/s]

Table 2: CASC2D-SED input raster maps.

	*Project name*	*File variable*	*Variable Read / Displayed*	*Description*
*Input Grids*	ELEVATION	elev_file	e[j][k]	Grid elevation at (j,k) [m]
	SOIL	soil_file	isoil[j][k]	Soil type index at (j,k)
	LANDUSE	iman_file	iman[j][k]	Land use / land cover index at (j,k)
	MASK	shap_file	ishp[j][k]	Watershed and channel network definition at (j,k)
	LINK	link_file	link[j][k]	Link number at (j,k)
	NODE	node_file	node[j][k]	Node number at (j,k)
	STORAGE_DEPTH	sdep_file	sdep[j][k]	Storage deposition at (j,k) [m]
*Time Series Output Grids*	RAINFALL	rname	rint[j][k]	Rainfall rates at (j,k) [in/hr]
	INF_DEPTH	vinfname	vinf[j][k]	Volume of infiltrated water at (j,k) [m]
	WATER_DEPTH	dname	h[j][k] or hch[j][k]	Depth of water (channels and overland) at (j,k) [m]
	SUS_SED	susname	totsus[j][k]	Total volume of suspended sediment at (j,k) [mm]
	SED_CONC	cname	Sqovs[SizeFr][j][k] / (water volume)	Total suspended sediment concentration at (j,k) [m³/m³]
	EROS_DEP	erosdepname	totnetv[j][k]	Total net erosion at (j,k) [mm]
	SAND_FLUX_OUT	sandfluxname	SedFluxOut[1][j][k]	Total sand flux out of (j,k) [m³/s]
	SILT_FLUX_OUT	siltfluxname	SedFluxOut[2][j][k]	Total silt flux out of (j,k) [m³/s]
	CLAY_FLUX_OUT	clayfluxname	SedFluxOut[3][j][k]	Total clay flux out of (j,k) [m³/s]
	TOTAL_FLUX_OUT	totalfluxname	qss[j][k]/dt	Total sediment flux out of (j,k) [m³/s]
	SAND_MFAC_OUT	sandMFACname	MFAC[1][j][k]	Max. flux-averaged concentration of sand out of (j,k) [m³/s / m³/s]
	SILT_MFAC_OUT	siltMFACname	MFAC[2][j][k]	Max. flux-averaged concentration of silt out of (j,k) [m³/s / m³/s]
	CLAY_MFAC_OUT	clayMFACname	MFAC[3][j][k]	Max. flux-averaged concentration of clay out of (j,k) [m³/s / m³/s]
	TOTAL_MFAC_OUT	totalMFACname	MaxFluxCout[j][k]	Max. flux-averaged concentration of sediment out of (j,k) [m³/s / m³/s]