SMS:SRH-2D Files: Difference between revisions
Line 359: | Line 359: | ||
===Guidance for creating a sediment rating curve=== | ===Guidance for creating a sediment rating curve=== | ||
When modeling sediment transport with SRH-2D a sediment rating curve may be specified for the upstream inflow boundary condition(s). The sediment rating curve option in SRH-2D requires that a Qs (or sediment discharge in cfs or m3/s) be provided for each size fraction in the run. It would be common for field measurements to provide the sediment concentration as parts per million by weight (ppm-wt) or mg/L. | When modeling sediment transport with SRH-2D a sediment rating curve may be specified for the upstream inflow boundary condition(s). The sediment rating curve option in SRH-2D requires that a Qs (or sediment discharge in cfs or m3/s) be provided for each size fraction in the run. It would be common for field measurements to provide the sediment concentration as parts per million by weight (ppm-wt) or mg/L. Here is a guideline for converting between such a quantity and the required input for SRH-2D (Qs). | ||
For low sediment concentrations (Cmg/L < 25,000) the conversion from concentration to sediment discharge, Qs is: | For low sediment concentrations (Cmg/L < 25,000) the conversion from concentration to sediment discharge, Qs is: | ||
Line 373: | Line 374: | ||
For higher concentrations the sediment contribution to the total flow volume should not be ignored. See HDS-6 Section 4.8 (FHWA, 2001) or a sediment transport textbook for exact relationships for high-concentration conditions. | For higher concentrations the sediment contribution to the total flow volume should not be ignored. See HDS-6 Section 4.8 (FHWA, 2001) or a sediment transport textbook for exact relationships for high-concentration conditions. | ||
Particle Diameter Thresholds (in mm) must be specified when modeling sediment transport with SRH-2D. These values are entered in the BC Type Parameters dialog accessed by right-clicking on the SRH-2D Boundary Conditions coverage used in the SRH-2D sediment simulation and selecting BC Types. | Particle Diameter Thresholds (in mm) must be specified when modeling sediment transport with SRH-2D. These values are entered in the ''BC Type Parameters'' dialog accessed by right-clicking on the SRH-2D Boundary Conditions coverage used in the SRH-2D sediment simulation and selecting '''BC Types'''. | ||
The number of columns in the sediment rating curve file should correspond to the intervals between the thresholds (or the number of thresholds minus one) plus an additional column at the beginning with the corresponding flow. It is the responsibility of the user to decide how many flows (one row for each) should be entered in the sediment rating curve. A particle size distribution analysis should be performed for the incoming sediment to determine the Qs in each size class in each particle diameter threshold interval. The number of sediment size classes in the sediment gradation curves specified for each layer in the sediment materials coverage don’t necessarily need to match the number of intervals between thresholds. | The number of columns in the sediment rating curve file should correspond to the intervals between the thresholds (or the number of thresholds minus one) plus an additional column at the beginning with the corresponding flow. It is the responsibility of the user to decide how many flows (one row for each) should be entered in the sediment rating curve. A particle size distribution analysis should be performed for the incoming sediment to determine the Qs in each size class in each particle diameter threshold interval. The number of sediment size classes in the sediment gradation curves specified for each layer in the sediment materials coverage don’t necessarily need to match the number of intervals between thresholds. |
Revision as of 15:46, 3 January 2019
The available input and output files for SRH-2D are listed below.
An explanation of files used by and generated by SRH-2D are as follows: Output FilesA description of each file generated during an SRH-2D simulation run is as follows. In the file descriptions, * is a placeholder representing the specific case name as specified in the model control:
Native FilesSRH-2D makes use of native files. The four native files are *.SRHHYDRO, *.SRMAT, *.SRHSEDMAT, *.SRHMPOINT, and *.SRHGEOM as described below: SRHHYDRO FileSRHHYDRO is written out by SMS to guide SRH-2D through the hydraulic simulation. The SRHHYDRO file contains key information about the simulation while acting as a directory to other files for SRH-2D to use. The SRHHYDRO file stores the case name, simulation description, model type, turbulence model information, Manning’s n values, boundary conditions, boundary types, unsteady flow designation, simulation time, resultant output information, and initial conditions. Details of each card in the file are given as follows:
The file acts as a map guiding SRH-2D to other important files such as the SRHMAT file, the SRHMONITORPTS file, and the SRHGEOM file. SRHHYDRO ExampleSRHHYDRO 30 Case "Case" Description "Description" RunType FLOW ModelTemp OFF UnsteadyOutput UNSTEADY SimTime 0 1 3 TurbulenceModel PARABOLIC ParabolicTurbulence 0.7 InitCondOption DRY Grid "HohRiv.srhgeom" HydroMat "HohRiv.srhmat" MonitorPtFile "HohRiv.srhmpoint" OutputFormat XMDF ENGLISH OutputInterval 1 ManningsN 0 0.02 ManningsN 1 0.025 ManningsN 2 0.07 BC 6 WALL BC 5 WALL BC 4 MONITORING BC 3 MONITORING BC 2 EXIT-H BC 1 INLET-Q IQParams 1 "HohRiv.srhcurve1.xys" EN CONVEYANCE EWSParams 2 "HohRiv.srhcurve2.xys" EN SRHMAT FileThe SRHMAT file gives each element a material type. This file will categorize each element to a Manning’s n value. SRHMAT ExampleSRHMAT 30 NMaterials 3 MatName 1 "Channel" MatName 2 "Forest" Material 1 1 2 12 14 15 23 24 26 27 28 29 36 37 38 39 40 41 42 49 50 51 52 53 54 55 56 63 64 65 66 67 68 69 70 71 82 83 84 85 86 87 88 89 90 91 103 104 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 207 208 209 210 211 212 213 214 215 216 217 218 Material 2 3 4 5 6 7 8 9 10 11 13 16 17 18 19 20 21 22 25 30 31 32 33 34 35 43 44 45 46 47 48 57 58 59 60 61 62 72 73 74 75 76 77 78 79 80 81 92 93 94 95 96 97 98 99 100 101 102 105 122 123 124 125 126 127 128 129 130 131 160 161 162 163 164 165 166 167 168 169 197 198 199 200 201 202 203 204 205 206 228 229 237 238 239 240 241 242 243 244 245 246 SRHSEDMAT FileThe SRHSEDMAT file gives each element a sediment material type. This file will categorize each element with specific sediment layer thicknesses, bulk densities, and gradations. The sediment materials may be the same or differ from the material types. SRHSEDMAT ExampleSRHSEDMAT 30 NSedMaterials 3 SedMatName 1 "Channel" SedMatName 2 "Forest" SedMaterial 1 1 2 12 14 15 23 24 26 27 28 29 36 37 38 39 40 41 42 49 50 51 52 53 54 55 56 63 64 65 66 67 68 69 70 71 82 83 84 85 86 87 88 89 90 91 103 104 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 207 208 209 210 211 212 213 214 215 216 217 218 SedMaterial 2 3 4 5 6 7 8 9 10 11 13 16 17 18 19 20 21 22 25 30 31 32 33 34 35 43 44 45 46 47 48 57 58 59 60 61 62 72 73 74 75 76 77 78 79 80 81 92 93 94 95 96 97 98 99 100 101 102 105 122 123 124 125 126 127 128 129 130 131 160 161 162 163 164 165 166 167 168 169 197 198 199 200 201 202 203 204 205 206 228 229 237 238 239 240 241 242 243 244 245 246 SRHMPOINT FileThe SRHMONITORPTS file or SRHMPOINT file is tells SRH-2D that there are monitor points to watch and where those points are located. SRH-2D will take the coordinates from SMS to locate the areas to be monitored. SRHMPOINT ExampleSRHMON 30 NUMMONITORPTS 2 monitorpt 1 798814 309513 monitorpt 2 799387 305853 SRHGEOM FileThe SRHGEOM file tells SRH-2D where each node is located and which nodes comprise each element. The SRHGEOM file also holds information about the units of the grid and node strings that are used for boundary conditions and monitor lines. SRHGEOM ExampleSRHGEOM 30 Name "HohRiverDomain" GridUnit "FOOT" Elem 1 5 1 6 15 Elem 2 1 2 7 6 Elem 3 3 1 5 Elem 4 2 1 3 Elem 5 5 8 3 Elem 6 3 8 10 Elem 7 9 8 4 Elem 8 13 4 14 Elem 9 14 4 8 Elem 10 11 4 13 Elem 11 4 11 9 Elem 12 14 5 15 24 Elem 13 8 5 14 Elem 14 6 7 17 16 Node 1 798908 309671 169.545 Node 2 798857 309733 170.299 Node 3 798975 309744 171.463 Node 4 799084 309550 170.097 Node 5 798959 309609 169.67 Node 6 798877 309645 169.34 Node 7 798828 309705 170.831 Node 8 799047 309635 171.189 NodeString 6 2 3 10 19 29 40 52 69 90 118 149 183 217 254 292 330 368 405 441 476 513 548 585 621 656 687 716 744 771 797 NodeString 5 171 205 240 278 316 354 391 426 462 500 536 574 610 646 679 710 740 767 793 819 843 867 891 915 939 963 986 1008 1031 1032
Sediment Rating Curve File "user_named.xys"The sediment rating curve file provides the water discharge versus sediment discharge for each of the size fractions included in the run. Both variables are in cfs or cms depending on the units selected for the project. The lines with “//” are comment lines.. Guidance for creating a sediment rating curveWhen modeling sediment transport with SRH-2D a sediment rating curve may be specified for the upstream inflow boundary condition(s). The sediment rating curve option in SRH-2D requires that a Qs (or sediment discharge in cfs or m3/s) be provided for each size fraction in the run. It would be common for field measurements to provide the sediment concentration as parts per million by weight (ppm-wt) or mg/L. Here is a guideline for converting between such a quantity and the required input for SRH-2D (Qs). For low sediment concentrations (Cmg/L < 25,000) the conversion from concentration to sediment discharge, Qs is: Where:
For higher concentrations the sediment contribution to the total flow volume should not be ignored. See HDS-6 Section 4.8 (FHWA, 2001) or a sediment transport textbook for exact relationships for high-concentration conditions. Particle Diameter Thresholds (in mm) must be specified when modeling sediment transport with SRH-2D. These values are entered in the BC Type Parameters dialog accessed by right-clicking on the SRH-2D Boundary Conditions coverage used in the SRH-2D sediment simulation and selecting BC Types. The number of columns in the sediment rating curve file should correspond to the intervals between the thresholds (or the number of thresholds minus one) plus an additional column at the beginning with the corresponding flow. It is the responsibility of the user to decide how many flows (one row for each) should be entered in the sediment rating curve. A particle size distribution analysis should be performed for the incoming sediment to determine the Qs in each size class in each particle diameter threshold interval. The number of sediment size classes in the sediment gradation curves specified for each layer in the sediment materials coverage don’t necessarily need to match the number of intervals between thresholds. SEDIMENT RATING CURVE ExampleRATING_CURVE // Q-vs- Qs rating curve at upstream boundary // 9 size fraction. 100ppm for cohesive sediment. 35315 1.3326 4.58713 2.49675 3.82647 1.36954 0.21376 0.01986 0.00174 0.00019 54080 2.0408 9.00825 4.97158 8.52648 3.24857 0.45732 0.02603 0.00245 0.00044 81910 3.0909 13.84716 9.12011 18.89248 11.53444 2.91612 0.34379 0.02711 0.00651 117161 4.4212 10.34221 9.51859 23.91257 20.10147 6.71838 1.17766 0.17474 0.03415 178208 6.7248 5.48430 6.92301 20.87747 21.68023 8.27505 1.58578 0.26850 0.05264 238037 8.9825 5.54236 7.73237 26.09735 31.32539 12.73831 2.58504 0.48187 0.12043 Related Topics
|