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disgreen

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Everything posted by disgreen

  1. disgreen

    Deleting Depression Polygon Mask

    Hi, This is a follow-up to a questions I asked previously. I have a model for which landscape depressions have been successfully masked and so are skipped over during the clean dams routine. However, for the purpose of run comparisons, I'd like to remove the polygon mask layer from my GSSHA model so that these features are filled while running the clean dam proceedure. It's not clear how this can be done easily. I've gone through the process of selecting the polygons using the select polygon tool in the map module and deleting these from the GSSHA coverage (I think). However, when I run clean dam, the output shows that numerous dams are still being ignored because of a depressional mask. How can I remove these masks without reconstructing the entire model from the raw DEM? Thanks. David
  2. disgreen

    Deleting Depression Polygon Mask

    Chris, Thank you for looking into this. The paper you linked to is the one I referenced in my question, and unfortunately doesn't really clarify the meaning of the L parameter in the context of explicitly and spatially defined arcs. I'll likely use a value of 1 since both drawdown formulations have L in the denominator and because my tiles are explicitly defined. My guess is that GSSHA will either encounter an internal computational INF error or produce numerically unstable results if L is zero. Thanks again. I really appreciate your help. David
  3. disgreen

    Deleting Depression Polygon Mask

    Hi Chris, Thank you for the reply. Your answer makes complete sense and works. Also, I have a question about tile drainage networks as conceptualized in the SuperLink model. According to Downer et al. (2014) the drainage spacing defines the lateral distance between parallel pipes. This parameter is a bit odd considering that individual pipes are represented by unique arcs in WMS and GSSHA. Does specifying a non-zero drainage spacing in WMS implicitly place additional pipes parallel to the primary pipe at the specified spacing, or does this parameter place pipes perpendicular to the primary pipe at the specified interval? Or, neither? Should I start a new topic, or can this be answered in this thread? Thanks again for all of your help. David
  4. disgreen

    Extracting Flow Depth Time-series

    Hello, I'm currently using GSSHA to model overland flow processes in a depression-dominated watershed. I've successfully mapped and retained the depressional characteristics of this basin, and have retained these features in the model and subsequent simulations. Now, I'd like to be able to determine the rate at which depressions fill from overland flow, and determine the extent of surface water connectivity between depressions using water depth contours at various times during a simulation. Is this possible using built-in WMS tools? Thanks, David
  5. disgreen

    Format of GSSHA.dep file

    Hello, I'm assuming that *.dep file the is the data file of simulated water depths for a given GSSHA simulation. I'd like to be able to import this file into Python or R to automate evaluation of simulated water depths at various locations within a model domain. Also, what is the general structure of the .dep file, and how is this linked to the model domain? Is the linkage through cell index or through the coordinates of the cell centroids? Thanks, David
  6. disgreen

    Converting GIS Point Features Into Gaging Stations

    Hi Chris, Sorry for the repeated posts. I wrote a small Python script to transform the point feature data into the gage file format you gave. It worked quite well. Thank you.
  7. Hello, I'm trying to retrieve dynamic stage in a number of depressional features within a model. Is there a way to convert points within a shapefile into monitoring gages within WMS? Thanks in advance. David
  8. disgreen

    Converting GIS Point Features Into Gaging Stations

    Hi Chris, An additional question: the gage file format looks to be space delimited. Is this correct? Thanks again, David
  9. disgreen

    Converting GIS Point Features Into Gaging Stations

    Hi Chris, As always, thank you for looking into this. I'll try your suggestion and let you know if it works. Perhaps this would be a good feature to add to WMS. Also, is there a way in WMS to do a bulk extraction of time-series from multiple gages? For example, one (ideal) export structure would be gages organized by ID (as columns) with a common time-stamp. Thanks again, David
  10. disgreen

    Extracting Flow Depth Time-series

    Hi Cody, Thank you for the suggestion. I'll take a look at placing monitoring gages in the depressions to get time-series of depth accumulation. The second part of my question is a bit vague, and is really mainly an idea at this point. In depressional landscapes depressions become connected through a fill-spill mechanism. This results in a continuous water surface connecting some depressions, but not all. The only way I can think of to map the connectivity of depressions at various points in a simulation is to evaluate the water depth contours and whether they intersect depressions. Is there a way to export these for a model domain for a set of time-steps? Thank you for your help. David
  11. disgreen

    Depression Polygon Mask

    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
  12. disgreen

    Depression Polygon Mask

    Hi Chris, Thank you for the prompt reply and detailed instructions. I've worked through most of the tutorials on WMS, but have yet to fully make connections between parts of the platform. As I mentioned in my post, we are modeling depressional storage and fill-spill processes on varied low-relief watersheds (i.e. think the prairie pothole region). I know that these depressions exist on the landscape, but am uncertain about whether they are retained in WMS when building a GSSHA model. For instance, are all depressions resolved when running TOPAZ?, and if so, does the elimination of these features show up in the model grid? How can I be certain that I am retaining depressional features on the landscape, and ensuring that GSSHA models their fill-spill processes correctly? Thanks in advance for your assistance. David
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