Tute M01 Boundaries SAGA: Difference between revisions

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Line 1: == Introduction == This page details the method for using SAGA to create the GIS based boundary layer files. Once the GIS layers are setup (detailed in this page), these are linked to data using a boundary database, (the boundary database is described in the <u>[[~~Tutorial_Module01~~Tutorial_Module01_Archive#~~Control_Files_and_Boundary_Condition_Database~~TUFLOW_Boundary_Condition_Database_.28bc_dbase.29 \| ~~the module~~Module 1 main page]]</u>). We will create three different boundaries: * Upstream flow boundary * Downstream water level - flow (stage-discharge) boundary Line 10: == Method == ===2d_bc Type Boundaries=== We will create the 2d_bc boundaries first. These boundaries are external and will "snap" to the edge of our active model area. Both of these boundaries have been aligned perpendicular to flow direction. <br> ''Note: This line orientation is recommended for 2d_bc QT, HQ and HT boundary inputs. Care should be taken to digitise these boundary types perpendicular to flow direction (i.e. across the waterway). If they are digitised oblique to the flow (i.e. not perpendicular) model instabilities can result in some cases.'' <ol> Line 73: <li>Save the file, by right clicking on it in the data tab and selecting save.</li> </ol> == Conclusion == SAGA has been used to create the 2d_bc layer that contains an upstream "QT" type inflow boundary and a downstream "HQ" stage-discharge type boundary. A second SAGA layer (2d_sa) defines an internal source boundary. Our next step is to assign hydrographs to the boundary locations created in this page. Please return to the tutorial model page [[~~Module1_test~~Tutorial_Module01_Archive#TUFLOW_Boundary_Control_File_.28TBC.29_Updates\|here]].