Revision as of 16:26, 12 December 2017 view source Mitch3007 (talk \| contribs) Bureaucrats, Administrators 1,585 edits →Topography and Bed Resistance ← Older edit		Revision as of 16:28, 12 December 2017 view source Mitch3007 (talk \| contribs) Bureaucrats, Administrators 1,585 edits →Boundary Conditions Newer edit →
Line 73: ==Boundary Conditions== The 1d/2d linking was along the top of the levee. The elevations along these levees were extracted from the 10ft DEM, these and other significant features were included in the TUFLOW model as 3D GIS breakline layers, ensuring the hydraulic control is represented in the grid regardless of cell size.▼ The 1D river channel model was linked to the 2D model using HX cells along the top of either natural or build levees on either side of the channel. These locations defined the location of spill into the floodplain and are the key control on how much flow can interact between the floodplain and river conveyance area. ===Open Boundaries=== All outflow from the model was assumed to be only via the main channel (ie. there was no water level boundary applied to the 2D overbank domain). ===1D/2D Linking=== ▲The ~~1d/2d~~1D ~~linking~~river channel model was linked to the 2D model using HX cells along the top of either natural or build levees on either side of the ~~levee~~channel. These locations defined the location of spill into the floodplain and are the key control on how much flow can interact between the floodplain and river conveyance area. The elevations along these levees were extracted from the 10ft DEM, ~~these~~ and other significant features were included in the TUFLOW model as 3D GIS breakline layers, ensuring the hydraulic control is represented in the grid regardless of cell size. ==Non-Infiltration Results== The flood extent from the 100ft 2D grid model is shown below. [[File:FMA3_3.jpg\|600px]] ===Sensitivity Creek Manning's n Test (Scenario 100ft n0.1)== As discussed in the Manning’s n table above, the main creek n value of 0.20 is considered very high, especially in the lower reaches of the study area. A sensitivity analysis was carried out by lowering all the Manning’s n values in the main channel (modeled as 1D cross-sections) to 0.10.

FMA Challenge 3: Difference between revisions