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Bathymetry map (DEM) and the reservoir Volume from bathymetry points

Question asked by fsh.shafiei on Feb 21, 2017
Latest reply on Feb 22, 2017 by dkwiens

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Hi,

I would like to create a bathymetry map (DEM) and calculate the volume for a large riverine reservoir (Lake Diefenbaker). I have the bathymetry depth points. The first issue is how can I restrict the interpolation area to the shoreline areas? Because points are along the river valley which it divides into a fork at the end (T shape reservoir, attached photo), I can’t simply create a TIN surface without creating a boundary around.

Could anyone provide me with a workflow from POINTS --> Bathymetry map (DEM) and the reservoir Volume?

Thanks

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LD bathymetry points.jpg68.3 KB

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dkwiens

Feb 21, 2017 1:47 PM

As far as I know, you do need to include the shoreline delineation as height = 0.

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fsh.shafiei @ dkwiens on Feb 22, 2017 8:42 AM

Hi Darren, Can you tell me how to do it?

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dkwiens

@ fsh.shafiei on Feb 22, 2017 9:16 AM

You can delineate the shoreline in many different ways. The problem is that the surface height of the water can change through time, so you need to somehow account for the surface height at the time of your bathymetry collection.

1.) Survey (not feasible for large lakes)

2.) GPS the shoreline (not feasible for large lakes)

3.) Delineate from very recent aerial photos (probably not available)

4.) Use an existing delineation of the lake (e.g. CanVec waterbodies, or higher resolution if you can find it for SK). Ideally, you collected accurate GPS points on the shoreline, and better yet you collected shoreline profiles at locations around the lake, so that you can adjust the existing shoreline delineation to the current condition.

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dkwiens Feb 21, 2017 1:47 PM
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As far as I know, you do need to include the shoreline delineation as height = 0.
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- fsh.shafiei @ dkwiens on Feb 22, 2017 8:42 AM
  Mark Correct
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  Hi Darren, Can you tell me how to do it?
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  - dkwiens @ fsh.shafiei on Feb 22, 2017 9:16 AM
    Mark Correct
    Correct Answer
    You can delineate the shoreline in many different ways. The problem is that the surface height of the water can change through time, so you need to somehow account for the surface height at the time of your bathymetry collection.
    
    1.) Survey (not feasible for large lakes)
    2.) GPS the shoreline (not feasible for large lakes)
    3.) Delineate from very recent aerial photos (probably not available)
    4.) Use an existing delineation of the lake (e.g. CanVec waterbodies, or higher resolution if you can find it for SK). Ideally, you collected accurate GPS points on the shoreline, and better yet you collected shoreline profiles at locations around the lake, so that you can adjust the existing shoreline delineation to the current condition.
    1 person found this helpful
    Like • Show 1 Like1
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Bathymetry map (DEM) and the reservoir Volume from bathymetry points

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