From a conversation with a specialist in soil subsidence we came to the conclusion about which was the most critical hydrogeological data needed for a numerical model. There is a proposed list of required data on this link, but when we plan a hydrogeological study which is critical? Data about the groundwater flow regime and the hydrogeological environment is always scarce. And there are even more complications on the data gathering because these data depend on a number of institutions and shareholders that could not be willing to share it because there is a mainstream ideaRead More
Hydrogeologist need to support the industry in a modular manner where hydrogeological concepts and evaluations has to be understood by all the related stakeholders in order to conduct an industrial activity with a clear sense of pumping / water level performance and changes in water quality with time.Read More
Stable isotope analysis is a powerful tool for the evaluation of groundwater origin and groundwater dynamics, specially when the observation points and recording periods are limited. Isotope representation can be done with any spreadsheet software, but the workflow is defficient specially when plotting scatter points, solid lines, labels and legends.
This tutorial shows a the complete procedure to represent a stable isotope representation of groundwater samples from remediation site in New Mexico, USA. The script is done with Python 3, Pandas and other packages that come alread installed on the Anaconda distribution. Code for the representation of the Global Meteoric Water Line is also included as well as options for the figure storage.Read More
Dear FREEWAT Users,
We wish to inform you that a new version of the FREEWAT plugin (v.1.1.1) is available since December the 4th 2018.
Besides fixing some minor bugs (thanks to Iacopo Borsi – TEA SISTEMI SpA) notified by the FREEWAT Users, this release includes:
an enhancement of the Multi-Node Well package (MNW2) of MODFLOW (thanks to Giovanna De Filippis – Scuola Superiore Sant’Anna);
two new packages for solute exchange with surface water bodies (e.g., rivers, lakes). This is now accomplished in FREEWAT through the integration of the Streamflow Transport (SFT) and Lake Transport (LKT) packages of MT3D-USGS (thanks to Giovanna De Filippis – Scuola Superiore Sant’Anna).
A list of the bugs fixed is available in the plugin folder.Read More
On a conversation with a colleague we have discussed the potential of selling groundwater modeling through the Internet. The idea (that is not so new) to develop groundwater models from remote areas optimizing the human resources, logistics and time involved on the evaluations its kind of the next step in numerical modeling but it has some arguments to be discussed for its implementation. From the management point of view, if we focus on mass production from and if we take into account theoretical concepts of business administration the idea of outsourcing tasks can be ideal for the success of a company or industry; however from the hydrogeological point of view there are serious complexities on the groundwater flow regime analysis, limitations on the input data and skills deficiencies that put the hydrogeological evaluation in risk if we work a groundwater model online.
In a global world we can make video call to almost anywhere for a reasonable price and our need/disponibility of broadband is always increasing but our ideas are not well conected and the group ideas are more distant than religion beliefs, therefore the method of developing a groundwater model could be of great importance in the quality of the groundwater evaluation through numerical modeling. This article discuss some key aspects of developing a groundwater model as a product (MAAP) and review its advantages and limitations.Read More
If we compare the amount of hydrologist vs. the amount of hydrogeologist, we can see that there is a gap in between the number of specialists in surface water and groundwater. Traditionally, the hydrology as a academic course is related to surface hydrology while the underground hydrology (hydrogeology) has been scarcely treated in typical undergraduate or graduate studies. As a comparison with then chicken and the egg, the lower or less popular academic opportunities in hydrogeology has produced a limited number of groundwater specialist who deal with a limited sort of groundwater studies.Read More
Maybe confined or unconfined aquifer are terms that would sound familiar from your first hydrogeology class, however it´s a simple definition about the location of the hydraulic head over the vertical limits of your aquifer. It might be that you have employed those terms in different reports, or maybe you have seen this aquifer classification on some environmental impact assessments or geological reports, but which is the relevance of this classification on the groundwater flow? This article talks about the comparison of the the confined / unconfined aquifer condition based on numerical modeling with some discussion about the convertible character of the aquifer.Read More
This example problem is adapted from the MODFLOW documentation and use to demostrate the use of MODFLOW with Model Muse. The model is implemented without parameters and uses the LPF Package. The model decribes a regional aquifer setup with acuifers and aquitards with the interaction of many boundary conditions as recharge, evapotranspiration, constant head and wells. Groundwater flow simulation was done on steady state conditions.Read More
Modflow with Model Muse are a powerful set of softwares developed by the USGS for groundwater modeling. Model Muse is very handy when working with GIS files but sometimes there are some specific requirements about the hydrogeologic features to conceptualize. This time we have prepared a tutorial about the multiple well configuration on a regional groundwater model. The tutorial deals with the model construction and configuration of 182 pumping wells on a 84km x 54km area in the north of Mexico.Read More
Model Muse is a software for the pre and post data processing of hydrogeological 3D model in MODFLOW. Both Model Muse and MODFLOW are developed by the USGS (usgs.gov). Model Muse is designed to work with objects and datasets, a powerful model construction methodology that allows the quick setup of boundary conditions, a simple way of progressive refinement and interesting features as inserting geological fractures on the numerical model.
This tutorial show the whole procedure for the conceptualization of several fractures based on some known fracture information as a point on the fractures, the azimuth and elevation. The tutorial deals with the theorethical determination of the fracture plane equation, the construction of a dataset with the desired equation plus the implementation of object that represents the fracture with the relevant hydrogeological features.Read More
Groundwater flow modeling depends on GIS data, and its output is compatible with a sort of GIS tools. In order to do analysis or representation from contaminant transport modeling it is needed a sort of commands, formats, tools and plugins from a stack of programs as ModelMuse and QGIS.
This tutorial is not only a example of water quality representation, it is as well a discussión on the main parts of modeling construction and simulation.Read More
Model Muse and QGIS makes possible to deal with geological data for the groundwater flow model cocntstruction. A diverse group of tools are required to process and insert geological features as contacts or faults. This tutorial show the whole procedure from the ground up to build the model geometry and insert a geological contact as the interfase within two layers.Read More
The processes of the superficial and groundwater water cycle are related to the precipitation (shape and intensity) and the dynamic of soil moisture. This dynamic of soil moisture is determined by the type of soil and the root zone in a daily, or even hourly, temporal scale. These phenomena have not been considered or studied in conventional hydrogeology text books, maybe because of their intensive use of modeling tools and complex conceptualizations and validations.Read More
GRIDGEN is a program developed by the United States Geological Survey (USGS) to create unstructured grids to be used in numerical models such as MODFLOW-USG.
The use of unstructured grids has advantages, like the capacity of refining specific areas. However, its design and manipulation is more complicated than in structured grids. The most complex step is the creation of input data, specifically the ones related to cell connectivity. For this reason, GRIDGEN is an useful tool that helps to simplify the process.Read More
The United States Geological Survey (USGS) has just released a new MODFLOW version: MODFLOW-6. This one comes with new functionalities to make it easier to create input files and perform simulations. Among the downloaded MODFLOW-6 files, there is an executable file to convert MODFLOW-2005 files to the new MODFLOW-6 format. In this tutorial we will show you how to do this.Read More
The United States Geological Survey (USGS) has just released the latest MODFLOW version: MODFLOW 6. It is the sixth core version of MODFLOW to be released by the USGS (previous core versions were released in 1984, 1988, 1996, 2000, and 2005).Read More
A new and fresh opensource preprocessing and post processing tool is available. Freewat 0.4 was launched as a beta version and publicly available upon registration from this website: http://freewat.eu/. Most of the developers are italian and the project is funded under the H2020 program from the European Union and the Regione Toscana. The software comes with clear and descriptive documentation and tutorials plus the installation instructions.
This article show the most important features of Freewat and its capabilities for representing the geospatially referenced regional groundwater flow.
Constructing and calibrating numerical models can be a challenging task in terms of time, available data and professional abilities of the modeler. Since this work is usually done alone, there are many questions about the conceptualization of the physical environment, the construction of the model and the calibration with observed data. Based on the questions asked by some attendees of our webminars, we have written this article for all the confused hydrogeological modelers.Read More
For most hydrogeologists numerical modeling of groundwater flow is still new and brings several challenges when dealing with input data, model construction and simulation. Most of our modeling efforts are done in gravity driven groundwater flow on shallow aquifers solved by Darcy law equations. Sometimes we excel ourselves in conceptualizing "advanced" topics as unsaturated flow, contaminant transport, variable density or baseflow calibration. What about if we consider another driving force besides gravity? Will out lives be happier/miserable? Could we cope with the huge amount of required data?Read More