Tuesday, March 21, 2023

2023 Stockholm Water Prize went to Andrea Rinaldo

As any year, the first day of Spring and the day before the Water Day, it is announced the Stockholm Water Prize. The Stockholm Water Prize is often described as the Nobel Prize of water and is characterized by a similar selection process. Since 1991, the Stockholm Water Prize has been awarded to people and organizations for extraordinary water-related achievements. Its official site is SIWI. Last year the Prize was given to Wilfried Brutsaert

This year prize was assigned to Andrea Rinaldo, first Italian to receive it, as a recognition of his achievements and its role for the Italian and International Community of Hydrologist. Professor in Padova and at Ecole Politechnique in Lausanne, he was one of the founder and head of the Civil and Environmental Engineering Department of the University of Trento of the degrees in Environmental Engineering.  The the official announcement has been shared on SIWI’s Youtube channel on Tuesday 21 March, at 3pm CET.  SIWI website (https://siwi.org/stockholm-water-prize/) contains further information. 

Andrea Rinaldo (center) in Mesiano - Trento - Department of Civil, Environment and Mechanical Engineering Department 


Andrea Rinaldo  is one of the most eminent Italian Hydrologists ever. The Italian community of hydrologist bloomed in the last twenty years and is now one of the most active and productive in the World. This was certainly due to the positive action that Andrea Rinaldo started since the late eighties of last century to promote young researchers and put them in contact with some of the most outstanding scientists in the field, starting from Ignacio Rodriguez-Iturbe,  Gedeon Dagan and Peter Eagleson (all of them have received the Stockholm Water Prize),  Raphael Bras and others. He was him between the very few who captured the attention of these greats with his creativity and dedication and involved them in researchers with Italians gifting many youngster of an incomparable education in hydrology. 

He steered the Italian Water Community to put attention on the important topics of water management, hydrology and geomorphology.  Some of the younger Italian scientists could not be aware of that but when some good research is published from Italians, there is a good chance that at least some drops of it have a seed in Rinaldo's academic and scientific work. 


Andrea Rinaldo   himself is an extraordinary researcher. He gave fundamental contributions in understanding the shape of river networks and his book with Ignacio Rodriguez-Iturbe is a long-standing milestone on the subject. The theory of optimal channel networks not only gives explanation of how the river networks evolve and behave but also has risen the interest for hydrology of scientists  working on related disciplines, and, in particular, of those working on transportation networks making hydrology an epitome of many other physical phenomena. 

He contemporarily worked on the theory of the Instantaneous Unit Hydrograph, where his contributions are among the the most cited. More recently he renewed the topic with a couple of papers that completely changed the view on travel times and residence times and related issues. Those contributions are definitive in clarifying the subject and they close with a neat theory ninety years of research history. At the same time those contributions are the seeds of the current studies with tracers and isotopes that are going to push greatly forward our knowledge on water movements in hillslopes and vegetation.


Together with  Rodriguez-Iturbe and younger fellows, he was architect of many eco-hydrological studies since the year 2000 that brought new insights in the soil-vegetation-atmosphere interactions and inspired new directions of research.


While continuing to frequent his vast collections of research topics that he manages masterfully, and where there are many “minor’’ contributions that could just be the reward of a carrier for others, he worked intensively in the last twenty years to understand the mechanics of  the spreading of the water borne diseases and, in general, of the spreading of populations. In this he actually joined together several of his research favorite topics, river networks, water, transportation issues, complexity, theoretical, field and laboratory work. His recent book with Marino Gatto and Ignacio Rodriguez-Iturbe is a compendium of  provoking ideas and methods that certainly will last long in the libraries (virtual or not) of the researchers of the field.

Monday, March 20, 2023

The Hydrology Class - The lab

Schedule

Index

The lab is almost half of the class. According to the motto "learning by doing" it covers at least three numerical experiments:

  • The estimation of the Intensity-Duration-Frequency curves
  • A few experiments with infiltration
  • A few experiments with evaporation and transpiration 
Please find below
Videos and material are  indicated singularly below.



2023-03-20 Introduction to working with Jupyter and Notebooks
2023-03-21
    • Counting the events and producing their empirical statistics (Vimeo2022)
2023 - 03 - 27/28
Interpolating the Gumbel distribution to annual precipitation maxima
2023-03-3
2023-05-17
  • Introduction to the Object Modelling System and its Console (Vimeo2023)
  • Creation of the WHETGEO - 1D Grid (Vimeo2023)
  • Introduction to WHETGEO - 1D (Vimeo2023)
2023-05-23
2023-05-29/ 2023-06-30
  • How to run WHETGEO-1D  (Vimeo 2023)
  • How to visualize the outputs of WHETGEO (Vimeo2023)
  • How to format and Create time series (Vimeo2023)
  • Estimating radiation in GEOframe (Vimeo2023)
  • The estimation of the transpiration stress factors (Vimeo2023)
  • The estimation of the evapotranspiration with the Priestley-Taylor formula (Vimeo2023)
  • The estimation of the evapotranspiration with the Penman-FAO formula (Vimeo2023)

Tuesday, March 7, 2023

When radiation hits canopies

 When radiation hits canopies its energy is partitioned among the leaves. Dealing with this complexity was faced since the studies by Monsi and Saeki, 1953 and summarised in Goudriaan, 1977 and Hirose, 2004. In the note at the link, there is a brief description of the Sun-Shade model by de Pury and Farquard, 1997 which assume that leaves are divided into 2 compartments, the leaves under sunlit and the leaves in shades. The Authors claim that this simplified model does not imply great errors in estimation of canopy radiation with respect to more complicate and computationally expensive models. 



References

Sunday, March 5, 2023

The DICAM-EXC Hydrological day

 As a conclusion of what done for the DICAM  excellence project we organized half a day of seminars. As keynote speaker we invited Andrea Rinaldo (GS), one of our mentors, who gave a keynote talk entitled "Reflected In Water". 



The contribution by Andrea was followed by the talk given by Giuseppe Formetta (GS) who was hired upon financial support of the project and presented his research activities. His talk was: Modeling multiple natural hazards with the GEOframe system in the Trentino Alto-Adige region (Video). 

Finally we had contributions from the three doctoral students also hired on the project, 

  • Concetta D'Amato, Steps toward a comprehensive treatment of the soil-plant-atmosphere continuum: the GEOSPACE model.
  • Maria Grazia Zanoni, Machine Learning for predicting and mapping hydrological and environmental variables.
  • Nerea Karmele Portilo de Alberoa. Microplastics in Riverine Systems: A Network-Based Model for Transport and Fate
Here please find the talk of Concetta D'Amato

Wednesday, February 15, 2023

The Hydrology Class 2023 - The Foreseen Schedule

This post contains the foreseen schedule of the course. Material uploaded is subject to modifications prior to the schedule date. All the lectures will be to students present in blended format. Meaning that students can be either present or attend remotely. All of them will be recorded and uploaded to web. 

Go to the Software Installation page



Topics in bold are definitive. Topics in normal characters are still subject to modifications.  All the 2022 videos will be available at this Vimeo Showcase.

2023-02-27 - Introduction to the course and to hydrology


2023-02-28 - Ground based Precipitations and their statistics Separation snow-rainfall - measure of precipitation

In this part of the class we describe where it rains and how much it rains using statistical concept. One important objective is to understand what are the extreme precipitations for their importance in engineering. 
2023-03-06 - 2023-03-13  - Statistics of extreme precipitations

 Some reviews on statistics - Return Period
Extreme precipitations  (Storyboard2020)
Distributions Storyboard2020

Determination of Gumbel's parameters
Extreme precipitations  II
2023-03- 14 -Beyond Gumbel
A summary about the extreme precipitation estimations (Whiteboard)

2023-03- 14 - Water in soil and aquifers. Darcy-Buckingham. Hydraulic conductivity. Soil water retention curves (Storyboard2020)

Once precipitations arrive to the ground surface they either infiltrate or generate runoff. We first state how they infiltrate and, actually how water behave in the soil and in the ground. We talk about the complexity of the Earth surface that contains life and call it, the Critical Zone. To study infiltration we introduce the Darcy and Richards equations of which we explain the characteristics. 
2023-04-03/04

2023 - 03- 21
 - The Richardson-Richards equation  (Storyboard 2020)
2023-03-27
    2021-04-20- Runoff Generation and propagation (Summary 2020)

    Once the rainfall gains the terrain, it can infiltrate or producing runoff. In the next we discuss the main mechanisms that produce runoff.
    Q&A - Runoff - Runoff 2022

    2022-05-03 - The surface water propagation (a brief Storyboard 2021)

    Runoff moves on the surface of the terrain according to the de Saint-Venant equation. In the following the equation is derived in the 1D case.

    Evaporation generalities 
    (Storyboard2020)

    A consistent part of root zone and surface water evaporates and returns to the atmosphere to eventually form clouds and precipitation again. The process follows quite complicate routes and is different when happening from liquid surfaces, soil or vegetation (and BTW animals).  In this group of lectures we try to figure out the physical mechanisms that act in the process and give some hint on methods to estimate evaporation and transpiration with physically based models. 
    2022-05-08 
    2022-05-15  -  Evaporation and Transpiration Formulas
    2022-05-15 -  After all radiation moves it all


    The Hydrology Class 2023 - Index

     Go to the foreseen schedule

    Go to the Software Installation page

    Go to the lab page

    What the Hydrology Course is About


    To have an idea about this class, please look at the Syllabus  slides in first lecture.  This year the class will be 90% similar to the one of the last year.  Laboratory work will be (mostly) concentrated in May and June. March and April up to Easter will be mostly spent to develop the theoretical parts.
    Lectures  and lab classes will be recorded and uploaded on my VIMEO channel. Old videos are also in my on my YouTube channel.

    The intermediate exam will be written (or oral *) with 3 questions about the topics treated.  The students will be asked to answer with text, figures and formulas. The final exam will be a discussion of the exercises provided by the students int the form of Jupyter notebooks. Each of the exercises will be discussed separately by booking an appointment with the professor before the formal date of the exam or at the day of the final exam. 



    This Hydrology class aims to explain the physics (meaning the mathematical equations and their phenomenology) and, in some cases, the statistics (i.e. the distribution) of the basic hydrological processes (precipitation, runoff, infiltration, evaporation and transpiration)
    Students will be required to:
    •  being able to derive and comment the hydrological equations above mentioned and 
    • to do some statistics on hydrological data. Particular attention will be dedicated to the derivation of the statistics of extreme rainfall.
    • Besides students will be requested to get some basics of the tools that will be used to estimate the hydrological fluxes (using a GIS, Python, and other tools, among those in GEOframe).
    They will be required to be able, by means of some models provided by the instructors the main hydrological fluxes and represent them at catchment scale.

    This is intended to serve as a basis for getting further knowledge and
    • prevent, manage, control floods, landslides and snow-avalanches
    • manage irrigation
    • estimate water availability for hydropower production
    • forecast roads freezing
    • estimate soil, roads, or snow temperature
    • forecast snow water equivalent and snow height
    Assuming that the student will take a master in Environmental Engineering at Trento University, Acquedotti e fognature, Modelli idrologici, Ingegneria fluviale, are classe that request the knowledge communicate in this Hydrology class. 

    The first part of the course, until April 3, will be dedicated to the presentation and discussion of theoretical concepts through lectures that will be videotaped and uploaded on the course's Vimeo channel. The lessons will cover 4 of the five hours per week. The fifth hour will be devoted to simple exercises with Python and Jupyter lab and to the preparation of the data necessary for the projects to be completed in the second part of the course in groups of two or three students.
    The student must take care to understand the hydrological concepts and discuss them with the lecturer. The first twenty minutes of each lesson will be devoted to the discussion of the topics covered in the previous lesson. Each group will have to prepare one question or comment to which the teacher will answer. A summary of the lesson will follow, followed by the actual lesson. The second part of the course will take up the theoretical themes of the first part and using the tools made available to the GEOframe system. Students, in groups of two or three, will have to:

    • Analyze a series of rainfall and hydro-meteorological data with the use of Python 
    • Estimate the intensity-duration-frequency curves with the methods presented in the first part of the course using the data of a hydro-meteorological gauge station
    Besides, they have to accomplish two of the following three tasks under the supervision of the tutor and the teacher: 
    • Design and run some infiltration simulations in complex soils and discuss the results.
    • Design and perform the calculation of evaporation and transpiration in a chosen site
    • Studying the coupled transpiration and infiltration in one site. 
    * The exam  about the theory part will be written.

    References

    The lessons will be video recorded and made available. Each lesson will be given through slides in English which will be delivered to students in advance. When necessary, the lessons will be accompanied by appropriate in-depth articles. There is no real text because the course, even when it is fully in the hydrological tradition, elaborates the concepts in a contemporary way and uses innovative tools.

    As general reference texts we recommend:
    • Bras, R.L, An introduction to Hydrologic Science, ISBN-13: 978-0201059229, 1989 - ISBN-10: 0201059223, Addison-Wesley (July 1, 1989)
    • Brutsaert, W., Hydrology: an introduction, ISBN-13: 978-0521824798 - ISBN-10: 0521824796, Cambridge University Press, 2005
    • Dingmann, L., Physical Hydrology, ISBN-13: 978-1478611189, ISBN-10: 1478611189, Third Edition, Waveland Press, 2015
    • Freeze, A. ; Cherry, J., Groundwater, 1979
    • Lu, N. and Godt, J.W., Hillslope Hydrology and Stability, Cambridge University Press, ISBN-13: 978-1107021068, ISBN-10: 11070210652010, 2013

    These books represent a shareable review of phenomena and hydrological modeling but the methods they present are not necessarily those used in the course. The course, also for reasons of time, presents a selected and limited perspective of the subject that the texts cited dissect from various points of view.

    The Hydrological Modelling Class 2023 - the foreseen schedule

     Index

    Go to:

     Foreseen Schedule (up to Easter)

    (boldface dates are those with definitive material, I or directly written in Italian  in for Italian,  unspecified for English. All slides are in English)

    To understand better what is below: 
    • storyboard is a summary, usually in Italian, of the lecture
    • A whiteboard is an explanation of a particular topic made on the whiteboard (using Notability on the iPad)
    • Slides are commented in English (since 2021)
    • Additional  information (only for the brave or the curious) and references are in italics



    The 2023 Videos can be found also at here in this Vimeo Showcase

    2023-02-27 - I  
    - Syllabus - Introduction 2 Hydrological Modelling 

    Here  I introduced the class. Its learning by doing philosophy (altered by the necessity due to COVID-19 times that impose to do first the all the theoretical parts and subsequently all the practical parts hoping that they can be done in presence). 
     Geomorphometry   - Discussion of previous lesson topics. Summary of the lecture in Italian. (This will be always done, each lesson, but for now on omitted). The rational of introducing these concepts  is that catchments are spatially extended and in this course we are interested to deal with catchments hydrology. 

    In this first part we deal with the geometrical (differential) characteristics of the topography. Elevations, slopes, curvatures. They will be necessary later to extract the river network and the parts of a catchment.
    In this class we define also what the drainage directions are and how they are computed in the case of DEMs (a topography discretized over a regular grid).  From drainage directions are determined the total contributing areas in each point of  a DEM. These two characteristics are eventually used to determine  the channels head and extract the river networkIn turn, the extraction of the channel network allows for the extraction of hillslope and a first definition of  the Hydrologic Response Units (HRU). 
      2023-03-02
      2023-03-06
      Q&A - 


      2023-03-02 -  Interpolations 
      This lecture, assuming that now you have at least the concepts of what a catchment is and theoretically you know how to extract it and subdivide it in parts, deals with the data to feed catchments hydrology models. Because catchments have a spatial distribution, then also the driving data must be distributed. We need therefore methods of interpolation. 

      2023-03-09 -  Interpolations part II. 
      In this class we try to understand how to estimate the errors over the estimates. Besides we introduce a method (the Normal Score) to avoid to obtain negative values when positive interpolated values are required.
      Q&A - 
      Spatial Interpolation (Vimeo2023)

       Hydrological Models. This is a class about hydrological models, so what are they ?

      The title is self-explanatory. A theoretical approach to modelling is necessary because we have to frame properly our action when we jump from the laws of physics to the laws of  hydrology. Making hydrology we do not have to forget physics but for getting usable models we have to do appropriate simplifications and distorsions. The type of model we will use in the course are those in the tradition are called lumped models. Here we also introduce a graphical tool to represent these models.
      Hydrological Models
      2023-03-13 - Hydrological Models - II
      2023-03-16
      2023-03-20 
       Linear Models for HRUs

      Once we have grasped the main general (and generic) ideas, we try to draw the simplest systems. They turn out to be analytically solvable, and we derive their solutions carefully. From the group of linear systems springs out the Nash model, whose derivation is performed.  Obviously, it remains the problem to understand how much the models can describe "reality". However, this an issue we leave for future investigations.
      2023-03-23 - 
       A little more on the IUH and looking at the variety of HDSys models

      We introduced previously without very much digging into it the concept of Instantaneous Unit Hydrograph. Here we explain more deeply its properties, Then we observe that there are issues related to the partition of fluxes and we discuss some simple models for obtaining them. Not rocket science here. The concept that we need those tools is more important than the tools themselves. We also observe that linearity is not satisfactory and we give a reference to many non linear models. Finally we discuss an implementation of some of the discussed concepts in the System GEOframe. 
      2023-03-30
      2023-04-06

       Travel Time, Residence Time and Response Time
      Here below we started a little series of lectures about a statistical way of seeing water movements in catchments. This view has a long history but recently had a closure with the work of Rinaldo, Botter and coworkers. Here it is presented an alternative vie to their concepts. Some passages could be of some difficulty but the gain in understanding the processes of fluxes formation at catchment scale is, in my view, of great value and deserves some effort.  The way of thinking is the following: a) the overall catchments fluxes are the sum of the movements of many small water volumes (molecules); b) the water of molecules can be seen through 3 distributions: the travel time distribution, the residence time distribution and the response time distributions; c) the relationships between these distributions are revealed; d) the relation of these distributions with the the treatment of the catchments made through ordinary differential equations is obtained through the definition of age ranked distributions; e) The theory this developed is a generalizations of the unit hydrograph theory. 
      2023-04-20
      Some References (advanced)

      Digressions I - A Glimpse on distributed process-based models

      Digressions II - Radiation -  After all radiation moves it all.
      Digressions III