Snow-modelling now based on Snow Water Equivalent

The snow-modelling part of the hydrological models integrating a snow component (Snow-GSM, GSM, SOCONT and HBV) has been improved. In former versions of RS MINERVE, the information of Snow water equivalent (SWE) was not directly available. The user only had access to two variables from which the SWE value could be computed: Hsnow, corresponding to the solid fraction of the SWE, and Theta, providing the relative water content.

From the new version 2.6, the variable Hsnow has been replaced by the variable SWE, accounting for both the liquid and the solid fraction of the snow pack:

SWE = Hsnow (solid fraction) + Wsnow (liquid fraction)

Analyses of the snow pack through an information accounting for the entire water content of the snow pack should thereby be made easier to RS MINERVE users.

Revised elevation gradient for Precipitation

When simulating in RS MINERVE, precipitation and temperature intensities are interpolated from the nearest stations using either Thiessen Polygons (nearest point) or the Shepard method, also known as the Inverse distance weighting method.

In the process of interpolation, a vertical gradient can be also used. For temperature, it is an additive term, whereas for precipitation it is a multiplicative coefficient.

By default for precipitation, it is set to 0 (no gradient).  As from the version 2.5.5.0, available as Beta since June 23rd 2017 and officially released on July 17th 2017, the unit of this gradient has been modified. The gradient of precipitation is newly expressed in [1/m], corresponding to percentage of increase/decrease per meter.

In addition, the gradient for the Potential Evapotranspiration has been also redefined in the same way.

Example : if the user wants to increase the precipitation by 20 per cent for each 1000 meters of altitude, the coefficient is equal to (20/100)/1000 = 0.0002.

The Technical manual of RS MINERVE has been consequently updated .

New Plugin manager

The Plugin Manager is a new feature of RS MINERVE that allows installing, updating and removing plugins from RS MINERVE. Interaction with the official list of plugins allows the Plugin Manager to inform the user when new versions are available and always show the complete list of available plugins.

RS MINERVE plugin manager

Plugin manager

Available since version 2.5.1.0

Features

  • Install, Update and Remove existing plugins ;
  • Notify when an installed plugin has an update available, and allow the user to update it ;
  • Install additional (personal) plugins.

And you can download the new CRUEX++ plugin directly from plugin manager. More info about the project on: https://cruex.crealp.ch

Improved GR4J model

The parameters introduction for the GR4J model has been slightly modified. Until version 2.4.2.0, the so-called transformed values had to be entered in RS MINERVE. As from version 2.5.0.0, released today as Beta version (available here), the real values will have to be entered.

The initial choice of using transformed values was based on users recommendations. However, using real values has the considerable advantage of having a physical meaning, for example for the store capacities in meter defined by the parameters X1 and X3. It also allows quick comparison between the parameters and the state variables.

When opening a .rsm model created with previous versions of RS MINERVE, a conversion into the new GR4J model version is proposed to automatically convert the values. Thereby, users will be able to continue working with their already existing models (Warning : once converted, no way back !).

Improved snow-melting model

Snow melting is an important component of the hydrological cycle, in particular in mountainous areas.  Modelling adequately this process is therefore important.

This led to the improvement of the snow-melting equations of the Snow-GSM, GSM and SOCONT models in RS MINERVE. Until now, the degree-day snowmelt coefficient, defining the quantity of melted snow per day as a function of temperature (mm/°C/day), was a constant factor. In the latest release of RS MINERVE, this coefficient can now vary over the year (see title image). The new parametrization is given by :

  • A reference degree-day snowmelt coefficient (Asn)
  • A degree-day snowmelt interval (AsnInt)
  • A phase shift of the sinusoidal function (AsnPh)

The first parameter defines the average degree-day snowmelt coefficient and the second parameter the interval of variation of the coefficient over the year. The third parameter defines the phase shift of the sinusoidal curve with respect to the first day of the year. As a first guess, it is recommend to use the day number of the year corresponding to the beginning of spring (80 for the Northern hemisphere, 264 for the Southern hemisphere).

 

New planner object to model complex hydraulic structures

How to model complex hydraulic structures and management rules like:

  • Control of irrigation systems?
  • Hydropower generation based  to the reservoir level or the electricity price?
  • Management of water shortages or overflows?

RS MINERVE provides a new feature to allow modeling the discharge of hydraulic structures based on a set of rules and conditions, reusing results of any model component.

The new modeling object, called “Planner”, offers many modeling options such as custom time-series or a time-based management using hourly, daily or monthly calendars.

The combination of management rules and conditions in this new Planner makes RS MINERVE a powerful tool to explore and optimize the management practices of complex hydraulic structures.

Be the first to test it!

New Regulation soon available

Would you like to manage your hydropower plant based on the reservoir level or the electricity price? Would you like to pump based on the upper level reservoir? To determine predefined rules to manage floods and reduce peak discharge downstream?

The new regulation available to realize these examples will be available in the coming days. This regulation allows the discharge management based on different inputs from anywhere of the model.  In addition, it can also take into account a defined timetable based on hours, days or months.

The combination of complex rules and conditions in the new regulation can characterize main real states of hydropower plants or other hydraulic structures. It will allow RS MINERVE to be positioned as a very interesting software for solving hydraulic issues.

New objects descriptions

The new version of RS MINERVE includes new information focused on helping the user to identify and understand each parameter and initial condition. It contains now the description of the parameters and initial conditions as well as the characteristic ranges. It allows quickly understand the usefulness of each of the elements of the program.

You can find more information about hydrological and hydraulics objects in the technical manual.

Descrip

Courses about ‘Hydrological and hydraulic modelling with RS MINERVE’ in Lima (Peru) – May 2016

Two courses (beginner and advanced) about ‘Hydrological and hydraulic modelling with RS MINERVE’ were held on May 17th to 19th and on May 20th 2016 in the Headquarters of the National Service of Meteorology and Hydrology of Peru (SENAMHI), in Lima, Peru.

In the first course, for beginners, theoretical and practical parts have been combined to provide the required knowledge to model hydrological basins with the help of RS MINERVE. 42 participants from different Peruvian organizations and consulting enterprises took part with a great interest and success.

In the second course, for advanced users which already followed the course for beginners in 2014 or 2015, the details of the different modules of RS MINERVE where revealed. Then, a practical exercise allowed the participants to become experts in hydrological and hydraulic modelling with RS MINERVE. 31 participants took part in this second course.

The courses, taught by J. García Hernández and J. Fluixá Sanmartín, from the Centre de recherche sur l’environnement alpin (CREALP-Switzerland) was organized in collaboration with the SENAMHI, the CREALP, the University of Zurich, the Swiss Agency for Development and Cooperation (SDC), Meteodat, Care Perú, Proyecto Glaciares+ and the Ecole Polytechnique Fédédale de Lausanne (EPFL).

More information (in Spanish) on this webpage.

Video about Hydropower object available from now

RS MINERVE contains different hydrological models for rainfall-runoff, such as GSM, SOCONT, SAC-SMA, GR4J and HBV. The combination of hydraulic structure models (reservoirs, turbines, spillways,…) can also reproduce complex hydropower schemes. In addition, a hydropower model computes the net height and the linear pressure losses, providing energy production values and total income based on the turbine performance and on the sale price of energy.

Basic instructions for using the Hydropower objects in RS MINERVE are presented in youtube.

More tutorial videos in the Hydro10 YouTube Channel.

free hydrologic – hydraulic modeling software

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