We see groundwater as a water reservoir inside the earth crust. It is defined that the top of the groundwater reservoir is called water table, but we rarely ever ask ourselves how deep groundwater is or about its quality. A complete vision of the hydrogeological system requires the understanding of the current state of groundwater quality and quantity.
Read MoreModel optimization involves adjusting parameter values so that the simulated results match stream flows as closely as posible. The software have two different search algorithms for the optimization as well as a variety of objective functions to measure the goodness of fit between simulated and observed stream flow.
Optimization trials are quite simple to set up and compute. This tutorial show the complete procedure to run a optimization for a hydrological model on a andean basin.
Read MoreA hydrogeological evaluation needs a numerical representation of the groundwater flow regime. Numerical models are a great tool to evaluate the current and future conditions of groundwater flow. In order to make a model, it is necessary to have geological and climate data, among other types.
The following list describes the input data needed to carry out a hydrogeological modeling. The information required could be either in tabular or vectorial format.
Read MoreSentinel-2 carries an innovative wide swath high-resolution multispectral imager with 13 spectral bands for a new perspective of our land and vegetation. The mission is based on a constellation of two identical satellites in the same orbit, 180° apart for optimal coverage and data delivery. Together they cover all Earth’s land surfaces, large islands, inland and coastal waters every five days at the equator (source ESA).
This is a group of videos called "Working with Sentinel 2 Imagery on QGIS" that shows the complete procedure to download, represent and process Sentinel 2 images in QGIS.
Read MoreThis tutorial show the procedure to create contours from a raster file considering interval definition. The example is made from a NDVI raster file.
Read MoreThis tutorial show the procedure to cut a NDVI Raster File calculated from a Sentinel 2 Granule on QGIS.
Read MoreImpact on groundwater flow from mining facilities could be evaluated many times along the different mining phases, many of these evaluations are done by different consultant companies. This post is focused on strategies and best practices for cost (& time) optimization, specially for hydrogeological investigation on mining projects.
Read MoreThis tutorial show the prodecure to calculate the NDVI from Sentinel 2 bands on QGIS.
Read MoreFalse color images are used to enhance certain cover types as vegetation on the image representation. This tutorial show the procedure represent the bands of a False Color image from Sentinel 2 bands in QGIS.
Read MoreThis tutorial show the procedure represent the bands of a Sentinel 2 Granule (Image) in QGIS. The representation of the image is True Color (Red, Green and Blue)
Read MoreIn order to make a hydraulic modeling with HEC-RAS, one of the most important input data needed is the river and cross sections geometry. However this data is not always available.
In this opportunity we want to present a QGIS complement called Q-RAS that, in a very simple way, creates the geometry data using a DEM file.
Read MoreIn the actual society, the environmental aspects are a concern when planning projects related to water resources. In this context, numerical models are useful tools to represent the superficial water and groundwater cycle and determine the contamination effects.
Read MoreInteresting tutorial that explains how to make a map with QGIS.
Read MoreThe Sentinel 2 satellites have a Multi-Spectral Instrument (MSI) with 13 spectral bands that range from the visible range to the shortwave infrared (SWIR). Bands come in variable resolutions from 10 to 60 meter and their wavelenght is determined based on specific purposes.
Read MoreThe NDVI (Normalized Difference Vegetation Index) is a versatile vegetation index to evaluate the vegetation and dynamic of the vegetation coverage change. This index has been studied and evaluated with many satellites over the years, changing its calculus method in relation to the number and type of bands of the satellite. The following tutorial shows the NDVI calculus for Landsat 8 images using QGIS.
Read MoreIf you need hydrogeology bibliography that includes topics like modeling, groundwater quality and remediation, the options are scarce. In this article we will show 8 excellent and recent groundwater books and a summary about them.
The following books have been bought by the author in bookstores or through websites. They all are in English and are in no particular order.
Read MoreSentinel-2 carries an innovative wide swath high-resolution multispectral imager with 13 spectral bands for a new perspective of our land and vegetation. The mission is based on a constellation of two identical satellites in the same orbit, 180° apart for optimal coverage and data delivery. Together they cover all Earth’s land surfaces, large islands, inland and coastal waters every five days at the equator (source ESA).
This tutorial show the procedure to download especific granules from a ESA Sentinel 2 Image using the website: https://scihub.copernicus.eu/
Read MoreSentinel-2 carries an innovative wide swath high-resolution multispectral imager with 13 spectral bands for a new perspective of our land and vegetation. The mission is based on a constellation of two identical satellites in the same orbit, 180° apart for optimal coverage and data delivery. Together they cover all Earth’s land surfaces, large islands, inland and coastal waters every five days at the equator (source ESA).
This tutorial show the procedure to download images of ESA Sentinel 2 from the website: https://scihub.copernicus.eu/
Read MoreOne of the most common tasks when working with Geographic Information Systems (GIS) is the representation of points from a spreadsheet to a shapefile. Here, we will explain the steps to achieve this.
Read MoreEvaporation is accomplished by removing water from the chemical system. Water can be removed as an irreversible reactant with a negative reaction coefficient in the REACTION keyword input. This example uses this method; the REACTION data block is used to simulate concentration of rain water by approximately 20 fold by removing 95 percent of the water. The resulting solution contains only about 0.05 kg of water. In a subsequent simulation, the MIX keyword is used to generate a solution that has the same concentrations as the evaporated solution, but has a total of mass of water of approximately 1 kg.
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