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Rain vs Evapotranspiration

Discussion of the Cumulusutils tool and website generator.

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Rain vs Evapotranspiration

Post by HansR »

Recent posts about the excessive rain this year and my experiments with the recent CustomLogs (webtag charting) gave me the idea for a new chart under the graphs Miscellaneous menu item (the climatic charts). It will be available in the coming 6.22 version (not sure yet when)

The chart will look like this (NB: one year will be the default startup period), any comment? :
    Schermafbeelding 2023-11-20 194430.png
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    Re: Rain vs Evapotranspiration

    Post by AndyKF650 »

    Hi Hans

    I like that, :D I had put that chart into my custom logs so it is only showing up for less than a month. Having it for multiple years it will show just how the interaction of sun and rain play out.
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    Re: Rain vs Evapotranspiration

    Post by PaulMy »

    Hi Hans,
    I haven't gotten into the customlogs so will need to do some catch up. I've often wondered on the correlation of ET and sunshine. Would it be possible to add sunshine?

    Enjoy,
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    Re: Rain vs Evapotranspiration

    Post by Dador »

    Cool idea, I'm in favor of it.
    If possible, I would like to see the Normal Yearly Rainfall option there as a line, as it is in graphsrain.txt.
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    Re: Rain vs Evapotranspiration

    Post by freddie »

    PaulMy wrote: Mon 20 Nov 2023 7:24 pm Hi Hans,
    I haven't gotten into the customlogs so will need to do some catch up. I've often wondered on the correlation of ET and sunshine. Would it be possible to add sunshine?

    Enjoy,
    Paul
    There's a correlation with wind speed and humidity too.
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    Re: Rain vs Evapotranspiration

    Post by freddie »

    @hans have you considered a plot of (rainfall - ET) against time? That shows you the deficit/surplus nicely.
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    Re: Rain vs Evapotranspiration

    Post by HansR »

    PaulMy wrote: Mon 20 Nov 2023 7:24 pm I haven't gotten into the customlogs so will need to do some catch up. I've often wondered on the correlation of ET and sunshine. Would it be possible to add sunshine?
    Hi Paul, I could add sunshine in that chart but I won't because a correlation is pretty evident and for this 'climate' chart it would be too much. I think the ChartsCompiler, ExtraSensors en now the CustomsLogs (specifically) in combination with the output specifier and the menus, you have all degrees of freedom you want.

    ET and Sunshine(hrs) in the same chart is possible. If you want, just specify a chart, what you want to see and where you want to show it and I will help you there if you have problems.
    Dador wrote: Mon 20 Nov 2023 7:36 pm Cool idea, I'm in favor of it.
    If possible, I would like to see the Normal Yearly Rainfall option there as a line, as it is in graphsrain.txt.
    Yes I get your point. I'll add it.
    I will also add verticals of 1 April to 1 October. These dates are in the Netherlands the boundaries for drought levels. Outside those dates agriculture is no longer interested in drought.
    freddie wrote: Mon 20 Nov 2023 7:49 pm @hans have you considered a plot of (rainfall - ET) against time? That shows you the deficit/surplus nicely.
    What you are actually asking is the area when ET is above the rain line. I thought about colouring that area - red hatched lines - in some way but I am not sure yet. I do not want to overdo the chart. I will not plot the difference explicitly as it is already in the chart itself.
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    Re: Rain vs Evapotranspiration

    Post by HansR »

    OK, This is the second version. The coloured ares are implemented as arearanges so the two separate series are no longer really visible so it is the tooltip supplying the detail1. I think this is it, I only think about an even much lighter colour of green. This seems a bit dominant.
    I started out this chart being in the miscellaneous menu, I'll give it its final place in the Rain graphs menu where I think it is more relevant.

    [1]: The arearange doesn't make life easier and I skipped the intersection calculations if the lines cross somewhere between two days. In this case not so very important I think. Btw... zooming in and out goes by the scroll of the mouse wheel. Did you know?
      Schermafbeelding 2023-11-22 180634.png
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      Re: Rain vs Evapotranspiration

      Post by Dador »

      It's good.

      For me, such a chart is clear and legible.
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      Re: Rain vs Evapotranspiration

      Post by Phil23 »

      Very interesting for Us Down here in Aus.

      I'm sure you may recall some of Our chats on the EVT Topic.

      Excessive Rain is not what I look at, lack of rain & EVT are much more an issue here generally.
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      Re: Rain vs Evapotranspiration

      Post by HansR »

      Phil23 wrote: Thu 23 Nov 2023 9:19 pm Very interesting for Us Down here in Aus.

      I'm sure you may recall some of Our chats on the EVT Topic.
      Sure, one of the sources for this chart.
      Phil23 wrote: Thu 23 Nov 2023 9:19 pm Excessive Rain is not what I look at, lack of rain & EVT are much more an issue here generally.
      I thought you would be interested :D

      But first you need to get your CUtils site running again: apparently you did restore a backup and with that the realtime location got lost again and you're back at the mixed content problem. That needs to be solved first. Than you can update and have the chart.

      And indeed I'am curious what the chart says in your area!

      [EDIT] But you always must remember EVT is derivative. It is not a true measurement like rain.
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      Re: Rain vs Evapotranspiration

      Post by mcrossley »

      and really EVT should be customised to the crop type, the MX calculation uses the "default" grass crop type.
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      Re: Rain vs Evapotranspiration

      Post by Phil23 »

      Welcome to the North West Slopes & Plains......
      EVT Vs Rain.jpg
      Edit:- And Daily Rain.
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      Re: Rain vs Evapotranspiration

      Post by Dador »

      Hans,

      2 quick things.

      - as you can see in the image, the Normal Yearly Rainfall text is under the layer. Can it be moved to the front?
      - in the CUstrings file I cannot find and translate the text Normal Yearly Rainfall, Daily Rain, Daliy EVT into my language.
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      Re: Rain vs Evapotranspiration

      Post by HansR »

      mcrossley wrote: Fri 24 Nov 2023 1:27 pm and really EVT should be customised to the crop type, the MX calculation uses the "default" grass crop type.
      Indeed... could be parametrized either in the equation or by different EVT types (different equations) ;)

      And probably also to climate zone : in arid zones the vegetation has anatomical strategies to prevent transpiration and keep the water inside (e.g. the stomata). In polar regions it is probably only evaporation from ice and snow directly into water vapour.

      I'm not asking but if there is a scientist who is able to give distinctive, proven formulas you might give it a try 8-)
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