Using radar data as precipitation input

[Amit Kallush]

Hi,

I trying to use AGWA for simulating flash floods in hyper-arid environment.

I have radar data for the watershed. the data is a grid of pixels and each pixel has is one location (lon/lat) and the amount of rain.

I want to be able to take a radar data in some point time (accumulated rain) and use it as precipitation input for KINEROS model within AGWA.

Is there a way to do that?

Thank you

[Shea]

Apologies, I realize I missed this question last year. From one of the precipitation files you attached in another other post, it looks like you may have figured this out already, but for the benefit of others I'll describe how the data as you described it could be used (there is also a version of K2 that can read radar files directly, which can be described separately if desired).

If you have pixels of accumulated rainfall depth, you can represent each pixel as an individual rain gage and K2 will interpolate differences in depths and times for each element as described on the "Rainfall Interpolation + Interception" page of the K2 documentation at https://www.tucson.ars.ag.gov/kineros/. Each rain gage will need coordinates input as the X and Y parameters of the rain gage in the precipitation file, and the coordinates should equal the center of the radar pixel and be in the same projected coordinate system as the watershed is in AGWA.

e.g. 

BEGIN GAGE 1
  SAT = 0.2
  X = 594065.3, Y = 3514148.6
  N = 5
  TIME        DEPTH !(mm)
     0          0.00
     5          1.07
    10          3.29
    30         14.8
    60         30.12
END

BEGIN GAGE 2
  SAT = 0.2
  X = 593117.8, Y = 3513843.3
  N = 5
  TIME        DEPTH !(mm)
     0          0.00
     5          4.01
    10          7.07
    15         12.3
    20         19.01
END

BEGIN GAGE x

...

...

etc

[Amit Kallush]

Thank Shea!

Indeed I figure it out (with much help from others). I took it one step forward and assigned the plane average areal precipitation to a fake rain gauge positioned at the plane centroid. This way, every plane has its own fake rain gauge.

I didn't try to use the radar pixels as fake rain gauges, like you described, but in theory, I guess that all of the pixels coordinates has to be inside of the watershed delineation?

ב-יום שלישי, 7 בפברואר 2023 בשעה 20:51:48 UTC+2, Shea כתב/ה:

[Shea]

No, I don't believe the coordinates are required to be inside the delineation, but I'm not actually certain without testing it. If the raingages fall outside of the mapped planes, the interpolation between gages can still intersect the model elements depending on how many gages there are and where they are in relation to the watershed. 

Shea