Flood Modeller Tutorial Module02: Difference between revisions
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=Introduction=
In this tutorial we will add a representation of a proposed development which involves adding TUFLOW 1D pipe network elements into the existing model network to represent the drainage network, which will then be linked with Flood Modeller Pro.
<br>▼
This will involve:
*Modification of the floodplain topography by the creation of a 3D TIN surface;
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*The addition of pipes and pits to represent an underground drainage network;
*Linking the pipe network to Flood Modeller; and
*The addition of an inflow into the pipe network.<br>
=GIS and Model Inputs=
The steps necessary to modify each of the GIS inputs are demonstrated in MapInfo, ArcGIS and QGIS. At each stage please select your GIS package to view relevant instructions.
<br>
==Define Elevations (Building a TIN)==
We have provided the GIS layers necessary to modify the ground elevations to represent the proposed development. This part of the tutorial will demonstrate how a TIN is created from these GIS layers. We will also update the GIS defining the road crest level. Follow the instructions below for your preferred GIS package.
* [[FM Tute M02_ARC_Define_Elevations | ArcGIS]]
* [[FM Tute M02_MI_Define_Elevations | MapInfo]]
* [[FM Tute M02_QGIS_Define_Elevations | QGIS]]<br>
==Define Surface Roughness==
We have provided the GIS layers necessary to modify the land use areas that will change as part of the proposed development. This part of the tutorial will require populating the layer attributes to assign Manning’s n roughness values to each land use. Follow the instructions below for your preferred GIS package.
* [[FM Tute M02_ARC_Define_Roughness | ArcGIS]]
* [[FM Tute M02_MI_Define_Roughness | MapInfo]]
* [[FM Tute M02_QGIS_Define_Roughness | QGIS]]
==Define Pipe Network==
This part of the module creates the GIS layers that make up a pipe network. The pits of the pipe network will be linked to the 2D domain. We will also create the pit inlet database which links the GIS layers to depth-discharge curves. Follow the instructions below for your preferred GIS package.
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* [[FM Tute M02_MI_Pipe_Network | MapInfo]]
* [[FM Tute M02_QGIS_Pipe_Network | QGIS]]
==Define Boundary Conditions==
This part of the module demonstrates how an inflow can be applied directly to the pits of the pipe network. A GIS layer of the inflow boundary has been provided. We will also modify the existing Boundary Conditions Database to include these new inflows. Follow the instructions below for your preferred GIS package.
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* [[FM Tute M02_MI_Boundary_Conditions | MapInfo]]
* [[FM Tute M02_QGIS_Boundary_Conditions | QGIS]]
===Flood Modeller/ESTRY 1D/1D Link===▼
TUFLOW models can also be configured with Flood Modeller for dynamically linked 1D pipe network 2D overland flow modelling. The main driver for this feature is for Flood Modeller - TUFLOW models to utilise the powerful pipe network and manhole modelling capabilities of TUFLOW (see
▲===Flood Modeller 1D/1D Link===
<br>
▲TUFLOW models can also be configured with Flood Modeller for dynamically linked 1D pipe network 2D overland flow modelling. The main driver for this feature is for Flood Modeller - TUFLOW models to utilise the powerful pipe network and manhole modelling capabilities of TUFLOW (see Section 5.12) and be able to link these networks into a Flood Modeller river model.<br>
Flood Modeller and TUFLOW (ESTRY) nodes will be considered linked if:<br>
<ol>
<li> An ESTRY node in a 1d_nwk layer, and a Flood Modeller node in a Read GIS
<li> The ESTRY node has a 1d_nwk Conn_1D_2D attribute of either "X1DH" or "X1DQ".</li>
::(i) If Conn_1D_2D is blank then “X1DH” is assumed.
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<li> An ESTRY X1DH (the default) would be used for most Flood Modeller ESTRY links. An X1DQ might be more appropriate where a Flood Modeller model stops and flows into an ESTRY model.<br>
</ol>
Generally, an ESTRY timestep will be smaller than the Flood Modeller timestep. In these cases, the total volume is accumulated over all ESTRY timesteps within a Flood Modeller timestep, and applied to the Flood Modeller model as a discharge by dividing the volume by the Flood Modeller timestep.
The mass balance _MB1D.csv file includes four new columns:
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*<b>X1DQ V Out</b>: The volume of water out via a X1DQ link.
The type or existence of a connection can be checked by viewing the Conn_1D_2D attribute in the 1d_nwk_N_check layer. The _messages.mif/.shp layer contains CHECK 1393 messages at each ESTRY node linked to a Flood Modeller node.
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=Modify Simulation Control Files=
Now that we have made all of the necessary changes to the GIS layers, we need to update our control files to include all the changes representing the proposed development.
<br>
==TUFLOW Geometry Control File==
There have been two changes to the model that impact the TGC file:
*We have created two layers that together form a 3D TIN representing changes to the ground elevations.
*We have created two 2d_mat layers that represent changes to the land use at the location of the proposed development.
▲<br>
<ol>
<li>Begin by opening <b>FMT_M01_001.tgc</b> in your text editor. Save the file as <b>FMT_M02_001.tgc</b>.
<li> Open <b>FMT_M02_001.tgc</b
<br>
'''MapInfo Users'''
<br>
<li>We will now add the commands to modify the topography to represent the proposed development. Add the following commands after the READ GIS Z Shape line:</li
:<font color="blue"><tt>Create TIN Zpts WRITE TIN </tt></font><font color="red"><tt>==</tt></font> mi\
▲:<font color="blue"><tt>Create TIN Zpts WRITE TIN </tt></font><font color="red"><tt>==</tt></font> mi\2d_ztin_FMT_M02_development_001.MIF | mi\2d_ztin_ FMT_M02_development_001.MIF </li>
The <font color="blue"><tt>Create TIN Zpts Write TIN </tt></font> command creates and writes an SMS .tin file to the same location as the GIS layer (in this case the TUFLOW\model\mi folder). The TIN can be viewed, checked and modified in SMS. This can then be read into the model directly using the <font color="blue"><tt>Read TIN zpts</tt></font> command for any subsequent model simulations.
<br>
Our intention for the 2d_mat layers created in this module is for them to build upon the existing commands which modify roughness. We would like for the new layers to overwrite the existing layers at the location of the proposed development. This process of layering and building up the model is a powerful tool in TUFLOW that minimises data duplication and provides a means of quality control. We need to ensure that the commands reading in our new 2d_mat layers are read in after the existing commands.
<br>
:<font color="blue"><tt>Read GIS Mat</tt></font><font color="red"><tt>==</tt></font> mi\
:<font color="blue"><tt>Read GIS Mat</tt></font><font color="red"><tt>==</tt></font> mi\
<br>
▲'''QGIS or ArcGIS Users'''<br>
<li>We will now add the commands to modify the topography to represent the proposed development. Add the following commands after the READ GIS Z Shape line:</li
▲<li>We will now add the commands to modify the topography to represent the proposed development. Add the following commands after the READ GIS Z Shape line:</li><br>
:<font color="blue"><tt>Create TIN Zpts WRITE TIN </tt></font><font color="red"><tt>==</tt></font> gis\2d_ztin_FMT_M02_development_001_R.shp | gis\2d_ztin_ FMT_M02_development_001_P.SHP </li>
The <font color="blue"><tt>Create TIN Zpts Write TIN </tt></font> command creates and writes an SMS .tin file to the same location as the GIS layer (in this case the TUFLOW\model\gis folder). The TIN can be viewed, checked and modified in SMS. This can then be read into the model directly using the <font color="blue"><tt>Read TIN zpts</tt></font> command for any subsequent model simulations.
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:<font color="blue"><tt>Read GIS Mat</tt></font><font color="red"><tt>==</tt></font> gis\2d_mat_FMT_M02_DEV_Buildings_001_R.MIF
<li> Save the file. The .tgc file is now ready to be used.</ol
==ESTRY Control File==
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'''MapInfo Users'''<br>
<li> Add the following commands at the bottom of the file as follows:
:<font color="blue"><tt>Read GIS Network</tt></font> <font color="red"><tt>==</tt></font> mi\
:<font color="blue"><tt>Read GIS Network</tt></font> <font color="red"><tt>==</tt></font> mi\
:<font color="blue"><tt>Pit Inlet Database</tt></font> <font color="red"><tt>==</tt></font> ..\pit_dbase\pit_inlet_dbase.csv
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:<font color="blue"><tt>Pit Inlet Database</tt></font> <font color="red"><tt>==</tt></font> ..\pit_dbase\pit_inlet_dbase.csv
<li>Save the file. The 1D control file is now ready to be used.</ol
==TUFLOW Boundary Condition File==
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'''MapInfo Users'''<br>
<li>Insert the following commands after the existing <font color="blue"><tt>Read GIS SA</tt></font><font color="red"><tt> ==</tt></font> mi\
:<font color="blue"><tt>Read GIS SA PITS</tt></font><font color="red"><tt> ==</tt></font> mi\
'''QGIS or ArcGIS Users'''<br>
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==Flood Modeller Simulation Files==
<ol>
<li>Open the Flood Modeller Pro model as per [[Flood_Modeller_Tutorial_Module01
<li>In the 'Links' tab with the 2D scheme set as TUFLOW, change the full path of the 2D control file to the <b>FMT_M02_DEV_001.tcf</b> from the <b>\FMT_Tutorial\FMT_M02\TUFLOW\runs</b> folder
<li>Save the Scenario Data.</li></ol>
Use your preferred method to start the model <b>FMT_M02_001.ief</b> or follow the guidance in the [[Flood_Modeller_Tutorial_Module01
=Review Check Files=
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From the <b>TUFLOW\check\2d\</b> folder import (into MapInfo) or open (ArcMap and QGIS):
*FMT_M02_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:
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=Review the Results=
Open the 2D results in your results viewer or import to your GIS package. It can be seen that during the flood event the capacity of the pipe network is exceeded resulting in flooding of the roads in the proposed development.<br>
[[File:M07 2d Results.PNG|800px]]<br>
<br>
The 1D ESTRY results can be viewed by importing the time series (_TS.mif or _TS_P.shp from the TUFLOW\results\1D folder, or opening any of the csv files outputted to TUFLOW\results\1d\csv. Another useful method for viewing the results of pipe networks is by importing in the _1d_ccA result layer found in the TUFLOW/results/1D folder. For each conduit or bridge within the model extent, this layer will provide information on the performance of the structure. Information such as percentage full and the time (in hours) the structure is at capacity are shown in this result layer. The layer is also automatically colour coded with thicker, dark purple lines highlighting structures that have reached capacity during the simulation. Thinner, pink lines show pipes that still have capacity.▼
<br>
[[File:M07 ccA Results.PNG|800px]]
=Conclusion=
▲The 1D results can be viewed by importing the time series (_TS.mif or _TS_P.shp from the TUFLOW\results\1D folder, or opening any of the csv files outputted to TUFLOW\results\1d\csv. Another useful method for viewing the results of pipe networks is by importing in the _1d_ccA result layer found in the TUFLOW/results/1D folder. For each conduit or bridge within the model extent, this layer will provide information on the performance of the structure. Information such as percentage full and the time (in hours) the structure is at capacity are shown in this result layer. The layer is also automatically colour coded with thicker, dark purple lines highlighting structures that have reached capacity during the simulation. Thinner, pink lines show pipes that still have capacity.
We have added to the model a final proposed development scenario. Using the Create TIN Zpts command, we have altered the ground elevations to represent the development. We have also added a 1D pipe network which has been linked to the 2D domain as well as feeding flows in the 1-dimensional channel represented within Flood Modeller. A pit inlet database has been created to specify a depth-discharge relationship for flow into and out of the pits. This allows us to create a fully integrated urban drainage model comprises 1D representations of the pipe network and river system together with the 2D surface.<br>▼
For further training opportunities see <u>[https://tuflow.com/training/training-course-catalogue/ TUFLOW Training Catalogue]</u> and/or contact <u>[mailto:training@tuflow.com training@tuflow.com]</u>. <br>
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{{Tips Navigation
▲We have added to the model a final proposed development scenario. Using the Create TIN Zpts command, we have altered the ground elevations to represent the development. We have also added a 1D pipe network which has been linked to the 2D domain as well as feeding flows in the 1-dimensional channel represented within Flood Modeller. A pit inlet database has been created to specify a depth-discharge relationship for flow into and out of the pits.
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