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Found 18 results

  1. Hi there, I am using GSSHA model for calibrating a rainfall event. When I calibrate a rainfall event, these two windows show after it run for about 20 minutes. These are the problem I met. 1. I checked the rainfall data times, total time and observe data times, all of them look normal. Is there anything I don’t notice? 2. This window shows up sometimes. I have no idea what “all your simulation data points have zero values” means. What can I do to solve it? 3. There is also a question: is there any table or web about gssha error and how to fix it? Thanks, Lu
  2. Hi Everyone, My apologies, this is my first post on here, however I am running into issues using GSSHA model. I get everything to run, however, when i read solutions, it shows that there is no stream depth, flow, velocity or flood depth. This leads me to believe that there is an issue with an index table or something, but I am at a complete loss. Also when running the simulation, it gave me errors for soil moisture. Attached is the video procedure I have done, If anyone has suggestions, please comment! Any help is greatly appreciated Tutorial2.mkv Tutorial2.mkv
  3. Greeting, I will like to know how GSSHA handles the variable stage (water surface elevation) boundary conditions. Does the GSSHA water depth results for a cell are being forced with this overland flow boundary condition if the feature point is located within the same cell or the boundary condition is being applied at the cell and GSSHA is allow to compute the hydrodynamics for this cell? In other words, does the GSSHA water depth results will be identical to the boundary condition applied at the same cell. Also, what does GSSHA does between the variable stage overland boundary condition? Does it compute the hydrodynamics at each time step for the boundary condition or does it linearly interpolate between boundary condition steps? For example, if the time step of my boundary condition is 5 minutes but the computational time step of GSSHA is 1 sec, does GSSHA computes the hydrodynamics each 5 minutes using the latest boundary condition data or does it interpolate the values between each 5 minutes? Any comments or feedback will be greatly appreciated. Please feel free to ask any question if my doubt was not clear. Thanks in advance,
  4. I am having a problem with my WMS 10.1.17 where when I run the CleanDam tool and accept changes, but the resultant grid still has depressions. It isn't readily apparent until I run a GSSHA simulation and look at the ponding. When I turn on digital dams in display properties I get no display of digital dams, however when I look at the flow directions with my depth grid, I can plainly see all four arrows pointing inward and a pond. I turn on elevations display values which confirms the flow directions honor the elevation file. I have tried running CleanDam externally from WMS as well with no luck.
  5. I'm attempting to model a small basin (~0.2 sq mi) using a long-term simulation. I can get the model to run without errors or warnings, but some of the model results are counter-intuitive. So I'd like to verify if I've set up my model correctly and throw out a couple concerns/questions that some of you might be able to help me out with. Some quick background about my model setup: I'm using a single rain gauge located very near the basin boundary, defined using a .gag file with hourly data for the duration of November 2009. I've compiled WES format hydrometeorological data file that also gives hourly data for November 2009. My HMET file includes no radiation data, so I'm relying on the GSSHA calculated radiation from lat/lon/time&date. Active modules are as follows: Overland flow computed by ADE with Interception; Evapotranspiration via Penman method; Infiltration via G & A with Redistribution (Soil moisture depth = 1.0 m, Top layer depth = 1.0 m); Channel routing via Diffusive wave. My primary concern with the results is the lack of evapotranspiration calculated by the simulation. Out of ~100,000 m^3 of precipitation during the simulation period, only ~100 m^3 are evaporated. (Roughly 20% of the precip is intercepted and the other 79.9% infiltrates.) 0.1% evapotranspiration seems alarmingly low, even for a very wet month with consistent cloud cover in the Pacific Northwest. I've tried manipulating all of the parameters that feed into the Penman ET calcs (including cloud cover and wind speeds in my HMET file), and I can only increase ET by about 50 m^3. Has anyone else had such a problem? Or can anyone think of a reason that ET would be so seemingly underrepresented? Secondarily, I'm not sure if I've understood the GAR layer depth parameters. I've read the Downer paper which explains the GAR (http://www.dtic.mil/get-tr-doc/pdf?AD=ADA473824) but still am unsure about the physical meaning of "Soil moisture depth" and "Top layer depth". Can someone clear this up? Ultimately, my basin of interest has approx. 1 m of silty loam resting atop an impermeable siltstone bedrock. A perched water table develops above the siltstone during the rainy season and it would be nice to recreate that with the model, but until now I've been unsuccessful with any of the Infiltration options. Could I model such a configuration with Richards Eq. or multi-layer G&A? Thanks in advance to anyone who reads! Hope it's all clear
  6. Hello everybody, I'm trying to run long-term simulation but it falls down very quickly. I suppose that the problem can be in my precipitation data file (.gag) as the last message concerns the precipitation data. Is there anyone who could confirm that to me? I attach the printscreen. The .gag file can be found at /data/files/osobni%20stranky/Vaclav%20David/model_data20180222_6_cont_prec.gag THanx in advance for any advice. Vaclav David
  7. Hello, My project has two large drainage basins that were delineated by creating two outlet points. However, after running the simple GSSHA model, only one hydrograph and summary data is created. Is it possible to generate hydrographs for both outlets as well as at other nodes in the model? Thank you in advance!
  8. Hello, I'm attempting to construct a GSSHA model of a low-relief watershed containing a significant number of natural topographic depressions. I'm uncertain about how to build and apply the depression polygon mask within WMS. I have a polygon shapefile of the depressions for this watershed. Can someone either point me in the direction of a tutorial on this process, or provide general steps within the answer to this post? Thanks, David
  9. Hi. I was wondering if anyone could clarify an aspect of the water elevation in the channel when using GSSHA. In the development of the channel input file for GSSHA, firstly stream arcs are generated from the DEM in WMS for GSSHA; then the thalweg profile (vertices) are then assigned elevations and corrected using the Smooth GSSHA Streams dialog box; and finally channel properties (channel depth, bottom width and side slope, and Manning's N) are assigned (using the Feature Objects -> Attributes). Figure 1 (attached) illustrates the cross-section of a river, where the brown line is a 40m resolution DEM that was used as the DEM input to GSSHA, and used to generate the stream network. The orange lines are the actual channel bed derived from field observations, and the blue area is water in the channel. A was the water level in the channel when the cross-section was recorded, When the thalweg profile (at one data point in the form of a vertex for this location) is assigned using the Smooth GSSHA Streams option, the elevation extracted from the data for this location would be A (1m). Then the channel properties are assigned, in this case a trapezoidal channel with a channel depth of 0.5m. This would mean that the streambed elevation would be 1-0.5 = 0.5m. My question is, if the channel depth (CHANNEL_DEPTH) project card is included in the simulation, and the water elevation rises above A, what processes/computation does GSSHA use to calculate the channel depth, considering that what GSSHA thinks is the top of the river channel is reached? Would this only of consideration if the OVERLAND_BACKWATER and/or OVERBANK_FLOW project cards are included in the simulation? Thank you in advance for any information. Hamish Asmath Institute of Marine Affairs, Trinidad and Tobago
  10. For long term simulation in GSSHA, where can we download direct and global radiation? I downloaded other hydrometeorology parameters (Pressure, Sky Cover, Wind Speed and Temperature) from NCDC website (http://gis.ncdc.noaa.gov/map/viewer/#app=cdo). Relative Humidity was estimated based on dew point and average temperature using this formula: RH: =100*(EXP((17.625*TD)/(243.04+TD))/EXP((17.625*T)/(243.04+T))) Is there any other recommended method for Relative Humidity estimation?
  11. GSSHA needs observed peak and volume flow data to compare calibration runs for a closeness of fit. If an observed hydrograph has multiple peaks for a single event, how will automatic calibration in GSSHA deal with that? Also, does automatic calibration in GSSHA tends to match observed peak and volume only, but not the shape of hydrograph?
  12. Recently I've been experiencing issues trying to implement more soil layers into my model. The model which worked fine with classic G&A redistribution infiltration routine suddenly produces weird results with G&A multilayer routine. The only change I made was switching to multilayer routine and assigning the depth of all layers. No matter what the depth was, disregarding any less permeable second layer I tried to introduce - the model always produces the same hydrograph with the peak as much as 20x higher then before and much faster response to all precipitation pulses. Moreover, when I tried to assign less permeable parameters to all layers, the peaks reached astronomic values, the model responded with NEGATIVE infiltration and the discharge volume reached about 200% of precipitation total. Does anyone has similar experience and/or suggestions, what went wrong? I suspect there's a numeric calculation bug inside :-) Thx Ludek S. CTU Prague
  13. What version of GSSHA does WMS 9.1.8 have?
  14. Attached picture is from the GSSHA long-term runoff simulation summary file. Although the first rainfall event starts on 07/14/2013 at 15:00, the summary file writes Hydrometeorology (hmet) data began on 07/15/2013 at 2:00. Is this delay normal, shouldn't both rainfall and hmet data start on same time? Seaworth06.txt
  15. There is still time to register for the training course "Hydrologic Modelling with GSSHA and WMS" June 18-21, 2013 in Provo, Utah. For more information, see: http://www.aquaveo.com/gssha_training_provo In this course, we will cover all aspects of GSSHA modeling, from setting up a basic model to setting up and running models with overland and stream boundary conditions. Visit the web page for more information and to register. We hope you can make it to this interesting course. Thanks, Chris
  16. Is there a way to use a HecRAS geometry file or an *.idx cross section database file to populate the cross sections in stream arcs for GSSHA? Thanks!
  17. I was exploring WMS-GSSHA results visualization and I have a question: Is it possible to show aggregated sediment loss on the map for a longterm simulation ? now I can only view one time step at a time , and I was wondering if I can also view sediment lost for example for the whole month ..using color ramp display on the map.
  18. Hello everyone, I am new to WMS. I would like to know if it is possible to use WMS to perform real-time simulations. Both radar and gauge rainfalls are avaialbe every 10 mins. Once models (HMS, RAS, or GSSHA) are set up, I would like to have an automatic process. Thank you
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