Displaying 20 results from an estimated 1000 matches similar to: "Question regarding reservoir volume and water level"
2024 Apr 07
1
Question regarding reservoir volume and water level
?s 13:27 de 07/04/2024, javad bayat escreveu:
> Dear all;
> I have a question about the water level of a reservoir, when the volume
> changed or doubled.
> There is a DEM file with the highest elevation 1267 m. The lowest elevation
> is 1230 m. The current volume of the reservoir is 7,000,000 m3 at 1240 m.
> Now I want to know what would be the water level if the volume rises to
2024 Apr 07
1
Question regarding reservoir volume and water level
Aside from the fact that the original question might well be a class exercise (or homework), the question is unanswerable given the data given by the original poster. One needs to know the dimensions of the reservoir, above and below the current waterline. Are the sides, above and below the waterline smooth? Is the region currently above the waterline that can store water a mirror image of the
2024 Apr 07
1
Question regarding reservoir volume and water level
John,
Your reaction was what my original reaction was until I realized I had to
find out what a DEM file was and that contains enough of the kind of
depth-dimension data you describe albeit what may be a very irregular cross
section to calculate for areas and thence volumes.
If I read it correctly, this can be a very real-world problem worthy of a
solution, such as in places like California
2024 Apr 10
1
Question regarding reservoir volume and water level
Dear all;
Thank you for your reply.
David has explained an interesting method.
David I have DEM file of the region and I have extracted the xyz data from
that.
Also I can extract bathymetry data as xyz file.
I have calculated the storage (volume) of reservoir at the current
elevation.
But the method I have used to calculate the volume is different from your
method. I have crop DEM by the reservoir
2024 Apr 09
1
Question regarding reservoir volume and water level
Water engineer here. The standard approach is to 1) get the storage vs.
elevation data from the designers of the reservoir or, barring that, 2)
get the bathymetry data from USBR or state DWR, or, if available, get
the DEM data from USGS if the survey was done before the reservoir was
built or 3) get a boat+sonar with GPS? +lots of time and survey the
bottom elevation yourself. Put the xyz
2024 Apr 07
1
Question regarding reservoir volume and water level
Homework?
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
On April 7, 2024 8:27:18 AM EDT, javad bayat <j.bayat194 at gmail.com> wrote:
>Dear all;
>I have a question about the water level of a reservoir, when the volume
>changed or doubled.
>There is a DEM file with the highest elevation 1267 m. The lowest elevation
>is 1230 m. The current volume of
2023 Dec 06
2
Volume of polygon
The volume of a polygon = 0. Polyhedra have volumes.
This may be irrelevant, but if the lake is cylindrical == constant cross
sectional area at all depths, then height doubles when the volume does and
vice versa. Otherwise you have to know how area varies with height or use
more sensible approximations thereto.
Cheers,
Bert
On Tue, Dec 5, 2023, 20:13 javad bayat <j.bayat194 at
2023 Dec 06
2
Volume of polygon
Dear all;
I am trying to calculate the volume of a polygon shapefile according to a
DEM raster. I have provided some codes at the end of this email.I dont know
if the codes are correct or not. Following this, I have another question
too.
I want to know if the volume of the reservoir rises or doubles, what would
be the elevation?
I would be more than happy if anyone could help me.
Sincerely
"
2023 Dec 06
1
Volume of polygon
Hi,
As already mentioned, this is a great topic for R-sig-geo, where you'd
probably get specialist answers like the lake morphology package
https://cran.r-project.org/web/packages/lakemorpho/index.html which is
explicitly designed for this kind of question.
Sarah
On Tue, Dec 5, 2023 at 11:13?PM javad bayat <j.bayat194 at gmail.com> wrote:
>
> Dear all;
> I am trying to
2023 Dec 09
1
Linear model and approx function
Dear all;
I have a dataframe with several columns. The columns are the elevation,
volume and the area of the cells (which were placed inside a polygon). I
have extracted them from DEM raster to calculate the volume under polygon
and the elevation for a specific volume of the reservoir.
> head(x6,2)
Elevation Vol Area V_sum A_sum
1 2145 13990.38 85.83053 13990.38
2012 Oct 19
3
saving to docx
hi all,
how can i saving R output to docx or Jpeg format?
[[alternative HTML version deleted]]
2023 Jun 11
2
Problem with filling dataframe's column
Dear R users;
I am trying to fill a column based on a specific value in another column of
a dataframe, but it seems there is a problem with the codes!
The "Layer" and the "LU" are two different columns of the dataframe.
How can I fix this?
Sincerely
for (i in 1:nrow(data2$Layer)){
if (data2$Layer == "Level 12") {
data2$LU == "Park"
2018 Jan 30
2
Calculating angle of a polyline
Dear R users
I am trying to find a formula to calculate the angle of a polyline. Is
there a way to do this?
Many thanks.
--
Best Regards
Javad Bayat
M.Sc. Environment Engineering
Alternative Mail: bayat194 at yahoo.com
[[alternative HTML version deleted]]
2023 Jun 11
1
Problem with filling dataframe's column
?s 21:05 de 11/06/2023, javad bayat escreveu:
> Dear R users;
> I am trying to fill a column based on a specific value in another column of
> a dataframe, but it seems there is a problem with the codes!
> The "Layer" and the "LU" are two different columns of the dataframe.
> How can I fix this?
> Sincerely
>
>
> for (i in 1:nrow(data2$Layer)){
>
2023 Jun 11
1
Problem with filling dataframe's column
Dear Rui;
Many thanks for your email. I used one of your codes,
"data2$LU[which(data2$Layer == "Level 12")] <- "Park"", and it works
correctly for me.
Actually I need to expand the codes so as to consider all "Levels" in the
"Layer" column. There are more than hundred levels in the Layer column.
If I use your provided code, I have to write it
2018 Jan 30
2
Calculating angle of a polyline
Assuming your polyline is defined by two vectors, one for the x
coordinates, one for the y coordinates, you can try the following
library(NISTunits)
polyangles <- function(xV,yV) {
stopifnot( (length(xV)==length(yV)) && (length(xV) >= 3))
v <- function(i) { c( xV[i]-xV[i-1], yV[i]-yV[i-1])}
vlen <- function(v) { sqrt(sum(v*v)) }
lV <- rep(NA_real_,length(xV))
for
2018 Jan 30
0
Calculating angle of a polyline
A polyline by definition has many angles, so your question is ill-formed. And this is a question about math, not R, so is off topic here. I suggest reading Wikipedia.
--
Sent from my phone. Please excuse my brevity.
On January 29, 2018 11:10:02 PM PST, javad bayat <j.bayat194 at gmail.com> wrote:
>Dear R users
>I am trying to find a formula to calculate the angle of a polyline. Is
2005 Aug 01
1
How do you set the encoder bit reservoir size?
Hi; In the Vorbis 1.1 release notes from July 7, 2004, Monty says
"The 1.1 libvorbisenc allows setting the fixed reservoir size (in bits,
defaulting to two seconds worth of requested bitrate) and 'hoarding'
behavior (whether the encoder tends to keep the bit reservoir more
full or more empty) as well as the other encoding heuristics available
through the API of 1.0.1."
2023 Nov 20
1
Calculating volume under polygons
Dear all;
I am trying to calculate volume under each polygon of a shapefile according
to a DEM.
when I run the code, it gives me an error as follows.
"
Error in h(simpleError(msg, call)) :
error in evaluating the argument 'x' in selecting a method for function
'addAttrToGeom': sp supports Z dimension only for POINT and MULTIPOINT.
use `st_zm(...)` to coerce to XY dimensions
2018 Jan 30
0
Calculating angle of a polyline
I like to use complex numbers for 2-dimensional geometry. E.g.,
> polyAngles2
function (xV, yV)
{
stopifnot((length(xV) == length(yV)) && (length(xV) >= 3))
z <- complex(re = xV, im = yV)
c(NA, diff(Arg(diff(z))), NA) # radians, positive is counter-clockwise
}
> x <- c(0:3)
> y <- c(0,0,1,1)
> polyAngles2(x,y) / pi * 180
[1] NA 45 -45 NA
Bill