Posts tagged #aquifer

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.



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.





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.



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.