Sunday, October 22, 2017

Simple models for hydrological hazard mapping

This contains the second talk I gave to high-school teacher at MUSE for the Life Project FRANCA. My intention was to show (under a lot of simplification assumptions) how hydrological models work, and give a few hints on which type of hydraulics models of sediment transport can be useful.
 Clicking on the figure above you can access the slides (in Italian but with a little time, I will provide a translation). In their simplicity, the slides are a storyboard for action that could be taken in the SteepStream project to provide an estimation of hazards of Meledrio river basin (and the other two selected).

Friday, October 20, 2017

On some Hydrological Extremes

This is the talk given at MUSE for the Life FRANCA Project. Life FRANCA has the objective to communicate with people about hydrological hazards and risk. In particular the Audience in this case was composed by high school teachers.


Clicking on the Figure you will be redirected to the presentation.

Wednesday, October 18, 2017

Using Colorblind friendly Plots

Brought to my attention by Michele Bottazzi. I rarely think to this. Instead it is important. Please refers to this Brian Connelly post:

Click on the figure to be redirected. BTW, this was the 500th post!🎉

Tuesday, October 17, 2017

TranspirAction

This post contains the presentation given by Michele Bottazzi. His presentation look forward to dig into the forecasting of transpiration from plants (and evaporation from soils) through concentrated parameters modelling. His findings will have a counterpart in our JGrass-NewAGE system.
The figure illustrate his willing to find a new, modern, way to scale up leaf theories to canopy and landscape. The starting point is one recent work by Schymanski and Or but it will go, hopefully, far beyond it. Click on the Figure to access his presentation.

An ML based meta modelling infrastructure for environmental meodels

This is the presentation Francesco gave for his admission to the third year of Ph.D. studies. He summarizes his work done so far and foresees his work during the next year.
Francesco's work is a keystone of the work in our group, since he sustains most of informatics and pur commitment to OMS3. Besides of this two are his major achievements: the building of the Ne3 infrastructure (an infrastructure inside an infrastructure!)  which allows an enormous flexibility to our modelling, and the new road opened towards modeling discharges through machine learning techniques. But there are other connections he opens that are visible through his talk. Please clisk on the figure to access the presentation.

Sunday, October 15, 2017

A few topics for a Master thesis in Hydrology

After the series about Meledrio I thought that each one of the post actually identifies at least one Thesis topic:

Actually, each one of them could be material for more than one Thesis, depending the direction we want to take. All the Theses topics assume that JGrass-NewAGE is the tool used for investigations.
Actually there are some spinoff of those topics:
  • Using machine learning to set part of model inputs and/or 
  • Doing hydrological modeling with machine learning
  • Preprocessing and treating (via Python or Java) satellite data as input of JGrass-NewAGE (a systematisation of some work made by Wuletawu Abera on Posina cacthment and/or Blue Nile)
  • Implementation of the new version of JGrass-NewAGE on val di Sole
  • Using satellite data, besides geometric features, to extract river networks
  • Snow models intercomparison (GEOtop and those in JGrass-NewAGE, with reference to work done by Stefano Tasin and Gabriele Massera) 
Other to other Hydrological topics:
  • Mars (also here) and planetary Hydrology (with GEOtop or some of its evolutions which account for different temperature ranges and other fluid fluxes)
  • Copying with Evapotranspiration and irrigation at various scales
  • Copying the carbon cycle to the hydrological cycle (either in GEOtop or in JGrass-NewAGE)
Other possible topics regarding water management:
  • Hypothesis on the management of reservoir for optimal water management in river Adige.
  • Managing Urban Waters Complexity
Other possible topics regards, on a more theoretical (mathematical-physical) side:
On the side of informatics:
For who wants to work with us on the Master thesis, the rules to follow are those for Ph.D. students, even if to a minor extent. See here:

Saturday, October 14, 2017

Meledrio, or a simple reflection on hydrological modelling - Part V

Another question related to discharges is, obviously their measure. Is discharge measure correct ? Is the stage-discharge relation reliable ? Why do not give intervals of confidence for the measures ? Yesterday, a colleague of mine, told me. A measure without an error band is not a measure. That is, obviously an issue. But today reflection is on a different question.  We have a record of discharges. It could look like this (forgive me the twisted lines):
Actually, what we imagine is the following:
I.e. we think it is all water. However, a little of reflection should make us think that, a more realistic picture is:
Meaning that part of the discharge volume is actually sediment transported around. This open the issue on how to quantify it. Figure enlighten than during some floods, actually the sediment could be a consistent part of the volume, and, if we are talking of small mountain catchments like Meledrio, it could be the major part of the discharge. Hydraulics and sediment transport, so far, was used separately from hydrology and hydrology separated from sediment transport, but what people see is both of them (water and sediment).
This actually could be not enough. The real picture could be, actually like this:
Where we have some darker water. The mass transport phenomena, in fact, could affect part of the basin during intense storms, but the liquid water could not be able to sustain all this transport. Aronne Armanini suggested to me that, in that case, debris flow can start and be stopped somewhere inside of the basin. Te water content they have, instead, could be equally likely released to the streams and boosting furthermore the flood.  Isn't it interesting ? Who said that modeling discharges is an assessed problem ?