Flood Modeller Tutorial Module02: Difference between revisions
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The FMT_M02_001_DEM_Z.asc is a grid of the final zpts used by TUFLOW after processing of each of the layers within the tgc. It can be read by most mainstream GIS software and also visualised in SMS.
'''Review Changes to Roughness'''<br>
From the <b>TUFLOW\check\2d\</b> folder import (into MapInfo) or open (ArcMap and QGIS):
*FMT_M02_DEV_001_grd_check
The grd_check file contains information on all cells within the model extent, such as ZC elevation and the location of the cell in relation to the model origin. One of the attributes of this check layer is the Material ID assigned to each cell. A review of this check file is recommended particularly when using multiple GIS layers to define the roughness of a 2D domain. The file can be colour coded to provide a visual representation of the roughness assigned to the entire model extent by:
*Thematically mapping the grd_check layer in MapInfo
*Changing the style of the grd_check file to 'Categorized' by the 'Material' column in QGIS
*By right clicking on the grd_check layer within the table of contents and click Properties. Once the properties dialogue window is open select the Symbology tab. Choose the Unique values option under Categories in the left-hand list and map the Value Field of interest.
'''Review Pipe Network'''<br>
From the <b>TUFLOW\check\1d\</b> folder import (into MapInfo) or open (ArcMap and QGIS):
*FMT_M02_001_nwk_C_check
*FMT_M02_001_nwk_N_check
These two check files provide information on the all 1D elements within the model. The _nwk_C_check layer provides information on all 1D channels (including structures) in the model, whilst the _nwk_N_check layer provides information on the nodes. Notice how the _nwk_C check layer shows a series of dashed lines at the locations where we have specified pits in the model. These lines represent 'pit channels', zero length channels that connect the 1D pipe network to the 2D floodplain. Viewing in conjunction with the _nwk_N check layer shows two nodes are created at the upstream (ground level) and downstream (invert of the pipe network) ends of the pit channel. The orange triangle at the upstream end provides information on the link created with the 2D floodplain. The blue diamond at the downstream end provides information on the automatically created manhole at the junction between the culverts of the pipe network.
'''Review Boundaries and 1D/2D Links'''
From the <b>TUFLOW\check\2d\</b> folder import (into MapInfo) or open (ArcMap and QGIS):
*FMT_M02_001_1d_to_2d_check
*FMT_M02_001_sac_check
The _1d_to_2d_check layer highlights the location of all 1D/2D boundary links within the model. Where we have digitised the pipe network, this check file shows the SX boundaries that have been created at the location of the pits. This check file also shows the ZC elevation of the SX boundary which can be compared to surrounding ZC elevations by viewing alongside the grd_check layer. The check layer also shows the HX boundaries digitised along the river banks in Module 01.
The _sac_check layer highlights the 2D cells connected to 1D pits where the 2d_sa inflow boundaries have been applied. The check file has been colour coded to show which 2D cells each of the four inflow boundaries has been applied to. The flow is distributed equally among each of the 2D cells.
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