For your modelling purposes, you were asking
for a DTM. I am providing that rotated map sheet that I use as a
standard for all these figures. The grid is provided at 2m
resolution and the pixel dimensions are:
This grid is the channel and lobe as it as in April of this
year - as each flow passes, the relief subtly changes. But this
should be adequate for modeling the 2019 (and 18) flows. For each
survey epoch, I have this same grid in the same format. All the
surface difference maps that you see are just one array
subtracted from the other.
The links below provide the grid bathymetry:
- ASCII
file (.llz) (97 Mb) containing lat-lon-depth
values for all filled nodes
- ASCII file
(.asc) (39 Mb) containing a 2D array (size
3700x1100) matrix of depths (unfilled cells contain :
-99999.000).
The upstream ADCP location is at:
- 49.672644 N -123.189593 W
- in pixel coordinates of the provided array : 802 376
The Channel Mouth ADCP is at :
- 49.673450 N -123.207028 W
- in pixel coordinates of the provided array : 1335 704
For interest, the three hydrophones were laid at:
- 49.674093 -123.1892
proximal_south
- 49.672317 -123.204155 mouth_south
- 49.672946 -123.222370 distal_south
I haven't processed those yet, but hopefully, all three heard this
flow.
Note that, with these early surveys, there are lots of bathymetric
artifacts due to imperfectly calibrated systems, thus much of the
background grey level fluctuations that you see are not real. I
hope you can see past this to recognize the periodic signature of
the migrating dunes.