Posts filed under Modeling

Seepage flow modeling from mine waste dump with MODFLOW

This example is a simulation of a mining dump, which is a continuous source of concentrated leachate.

Hydrogeological complexities to consider: heterogeneity of the aquifer and the presence of fractured rock.

Groundwater system parameters:



Assessment of land subsidence from pumping


The MODFLOW SUB-WT code has been developed to simulate vertical compaction in regional groundwater flow models because due to pumping. MODFLOW SUB-WT can simulate changes in groundwater storages and compaction in discontinuous layers or extensive confining units. The MODFLOW SUB-WT modeling code considers the compaction of a particular layer of the numerical model as a function of effective effort changes in the layer.

Posted on October 3, 2013 and filed under Modeling.



How much does a groundwater modeler cost?


After my last job as a staff groundwater modeler I have received 6 unsolicited job offerings. Of course many modelers with more years and more conections than I have received much more offers, however, I feel happy with my humble record. The point of this comparison is that senior groundwater modelers with experience in mining hydrogeology are really scarce. Mining and consultant companies are looking for talented groundwater modelers, and somehow there are not much modelers coming out from the universities.




How to be a senior hydrogeologist in 6 years


When I was in second semester of my master degree, the course director gave me this advice: “Learn MODFLOW and you will have a job”. That was a small and sincere advice that helped me on the last eight years as hydrogeologist – numerical modeler. Nowadays, I want to give the guidelines for the interested people of how to be a senior hydrogeologist in 6 years.




Why is MODFLOW better than other softwares for groundwater modelling?


MODFLOW is the groundwater modelling software developed by the U.S. Geological Survey (USGS). It appeared in 1984 and has had a constant developement till now. MODFLOW's capacities allow the representation of regional or local groundwater flow and its interaction with superficial water bodies.

Posted on October 3, 2013 and filed under Hydrogeology, Modeling.



Geostatistics on water resources investigation

Before talking about the different researches that have had as main focus the water resources, I think it is necessary to explain first what geostatistics is.

Geostatistics is a type of statistics that is used in order to analyze and interpret geographically referenced data. It is not restricted to only work with point data, but can also work with GIS layers to explore spatial variation, improving generation of digital elevation models (DEM) and their respective simulations, optimization of spatial sampling, etc.

Posted on October 3, 2013 and filed under Hidrology, Modeling.



Overview of the "Radius of Influence"


Since an homogenous aquifer was modelled, there is an interest in comparing the results with an analytical solution. Some formulas give the drawdown value into the well for a steady flow in confined and unconfined aquifers that are homogeneous, isotropic and infinite in the horizontal extent with a single full penetrating well.

Posted on October 2, 2013 and filed under Hydrogeology, Modeling.





MODFLOW is the software for groundwater modeling developed by the USGS. The software is capable of representing conditions related to groundwater flow as evapotranspiration, recharge, drainage, river interaction among others. Its finite different approach gives the capability of calculating the flow regime with exceptional control on water budget discrepancy. 

Posted on October 2, 2013 and filed under Modeling.



Groundwater modeling of the Al Haza Oasis

The Kingdom of Saudi-Arabia, located in the central part of the Arabian Peninsula, is covered mostly by large deserts of rock and sand with low precipitation and a very arid climate. During the last 20 years a continuous increase in groundwater extraction has taken place due to industrial and agricultural activities.



Environmental flow determination by hidrological modeling


The world water legislation has a common challenge: distribute fresh water resources in a fair, efficient and sustainable way. Traditionally, agriculture, industry, mining and municipalities have competed for these limited resources. The old legal structures were created to satisfy economic and domestic use of water demands ignoring the ecosystem use, that until recently were not fully scientifically understood.

Posted on October 1, 2013 and filed under Modeling.