Posts tagged #groundwater

Soil cover system design for mine waste dumps

 

Surface water and groundwater surrounding a mining operation can be significantly affected by contaminated seepage from the Acid Rock Drainage (ARD) in the waste-dumps and tailings deposits. An evaluation for prevention and mitigation of environmental impacts generated by the DAR is necessary to minimize the impact to the environment.

Posted on October 4, 2013 and filed under Mining, Water quality.

 

 

Cost (& Time) optimization of hydrogeological studies

Impact on groundwater flow from mining facilities could be evaluated many times alongs the different mining phases, many of these evaluation 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.

 

 

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.

 

 

 

Tailing and waste dump seepage evaluation and remediation

 

Current and historical mining activities have a seepage and waste-dumps legacy that are the concern for mining companies, population and regulatory authorities. Old waste-dumps have not been regulated and most of the old tailings have been deposited in soils without covering. Tailing deposits and waste-dumps should be analyzed in a particular way because of the ground, instalation details, mineralized body geology, mined type, weather and other parameters.

 

 

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.

 

 

Isotope investigation for understanding groundwater flow regime

 

Environmental isotope investigation is a tool for understanding the regional groundwater flow and confirms or refutes the inferred relations between aquifers. Isotope investigation can give information about groundwater sources, ages, travel times and flow paths.

Posted on October 3, 2013 and filed under Hydrogeology.

 

 

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.

 

 

To learn MODFLOW with MODEL MUSE

 

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.

 

 

Main factors affecting groundwater regime

The concept of a groundwater regime is based on the fact that the occurrence and distribution of groundwater is not merely a product of chance, but the result of a combination of climatic, hydrologic, geologic, topographic and soil-forming factors that together form an integrated dynamic system. These factors are interrelated in such a way that each provides some insight into the functioning of the total system and thus serves as an indicator of local conditions of groundwater occurrence and distribution (PAEL, 1993).

 

 

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.

 

 

Main predictive simulations for an EIA in mining

 

Impact assessment of mining projects on groundwater resources can be a challenging task due to uncertainty on groundwater flow regime, the complex numerical tools to successfully simulate stresses on groundwater resources posed by mining projects, and timeframe and budget of the EIAs.

 

 

Groundwater monitoring system implementation

A monitoring system is a platform where the level and quality records that describe groundwater resources are generated, made available and evaluated. These records are consistent, representative and long lasting. To manage the aquifer on a local or regional level it is required to have environmental managers with easy access to comprehensive, representative and reliable information.

 

 

Design and implementation of groundwater monitoring systems

 

A monitoring network is a system where the level and quality records that groundwater describes are generated, become available and are evaluated. These records are consistent, representative and long lasting. A monitoring network provides levels and quality data that can be used to answer different questions about water resources underground in a variety of regional and local scale.

Posted on October 1, 2013 and filed under Hydrogeology.

 

 

Feasibility and environmental assessment of hydropower plants

 

Hydropower is the energy source that requires no fossil fuels and doesn´t present carbon emissions to the environment in its operational stage. Within the global energy framework there is great demand for both types of energy, renewable and non-renewable, and a special interest in the search of undeveloped hydroelectric resources in high potential and the Andean countries.

Posted on October 1, 2013 and filed under Hydraulic.

 

 

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.

 

 

Case studies of watershed-based water balance

 

A watershed can be defined as “the topographic area within which apparent surface water runoff drains to a specific point on a stream or to a waterbody such as a lake” (Shimon, 2010), in this way a watershed works as a large water collector converting water inputs into runoff and water storage (Chavarri, 2012).