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What is the range of water elevation at the downstream of the model? This tool only have one place to where all the water in the model flows to.A good programmer could extend this to multiple incoming flows What is the range of the discharge coming in into the river? Only one channel to have an input discharge.If there is an ice jam, what the manning n value of it?.What is the roughness of the ice cover? Again, like with ice thickness the same value is applied overall the river. In here you can have only one ice thickness for the whole river, but that value can be extended to overbanks or then they are zero. Meaning the thickness of ice before any ice jams. I see I had added an option to use the actual Manning n values or then a partition or multiplier of the original geometry n-values. Manning n values for the channel and left and right over banks (LOB, ROB).For a river with ice jam possibilities I thought these are important: Try to be realistic, remembering that the world can give surprises too. In this current version you must give a minimum and a maximum value. Try to think what kind of ranges the most important and/or meaningful physical quantities can have.Pay attention observations and measurements have a good quality. As the values can and will for example change with the decreasing and increasing discharge, downstream water elevation and growing and diminishing roughness factors (aquatic plants, landslides to river etc.) so it’s luckily useless to try to be perfect here. But unfortunately, as this isn’t a miracle doing everything for the user, it should be measured well and be able to produce good results. You don’t have to have a fully calibrated hydraulic river model.So how does my version of GLUE and the first ever (and still the best) hydraulic model for me, HEC-RAS, work together then? I personally named that as GLUE-RAS. Not applying the method then as the plan for the thesis was already made, but it would definitely have been a great help and make the results even better (well it was good enough if you ask reviewers and the 2008 version of me ? Link to the abstract of the master thesis). I have this book about GLUE and I can recommend it if you want to learn more – and numerous scientific articles. I don’t know if I ever realized GLUE (generalised likelihood uncertainty estiation) method correctly and there is still plenty to learn for sure, but I became a fan of it already when I did my master thesis. I wrote another post about this some time ago. I’ll use my old “Ice-GLUE” as an example. I still think it’s a very good way to make your modelling and results even better. I suppose I never emphasized properly (or enough) why GLUE method is so good.
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A blog then? ? I haven’t been doing anything hydraulic modelling related lately, so please let me tell something old stuff while updating the laptop, getting familiar with the keyboard and working routines and remembering too many forgotten passwords. I know especially now that documenting (and having a specific place for them) is vital if the purpose is to use them later. Yes I have, but like too many times before, it was not documented properly. One more specific reason could be a colleague who asked me if I still have my GLUE thing. But I just paid an extra year for this domain so publishing gives some instant value for the “investment”. What could be a better motivator to publish a new post than money? Many other, to be honest. And sharing is caring: At least I have gotten ideas from conferenses, scientific articles and just googling things. These are challenges, so training is for good. Well, readers or no, I think it’s good to at least to try to tell what I do and how and why – in an understandable and dense way. So this is not the typical “Hey I have a blog, please check this out!!1” and after a couple of posts and hardly any visitors: “but it’s so hard to publish new stuff and all this actually takes a lot of time, so let’s just let the time fade all this away” -explanation. That’s the reason why I haven’t published any new posts, especially almost right away after the start.
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