scholarly journals Constraining a Flow Model with Field Measurements to Assess Water Transit Time Through a Vadose Zone

Ground Water ◽  
2020 ◽  
Author(s):  
Lamine Boumaiza ◽  
Romain Chesnaux ◽  
Julien Walter ◽  
Christine Stumpp
Keyword(s):  
Transit Time ◽  
Vadose Zone ◽  
Flow Model ◽  
Field Measurements

Evaluation of the Conceptual Flow Model for a Deep Vadose Zone System Using Advanced Tensiometers

2004 ◽  
Vol 3 (1) ◽  
pp. 170
Author(s):  
Deborah L. McElroy ◽  
Joel M. Hubbell
Keyword(s):  
Vadose Zone ◽  
Flow Model

scholarly journals Conceptual and Mathematical Modeling of a Coastal Aquifer in Eastern Delta of R. Nestos (N. Greece)

Hydrology ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 23
Author(s):  
Ioannis Gkiougkis ◽  
Christos Pouliaris ◽  
Fotios-Konstantinos Pliakas ◽  
Ioannis Diamantis ◽  
Andreas Kallioras
Keyword(s):  
Mathematical Modeling ◽  
Groundwater Flow ◽  
Coastal Aquifer ◽  
Flow Model ◽  
Meteorological Data ◽  
Field Measurements ◽  
Groundwater Flow Model ◽  
Aquifer System ◽  
Geophysical Surveys ◽  
The Mathematical Model

In this paper, the development of the conceptual and groundwater flow model for the coastal aquifer system of the alluvial plain of River Nestos (N. Greece), that suffers from seawater intrusion due to over-pumping for irrigation, is analyzed. The study area is a typical semi-arid hydrogeologic environment, composed of a multi-layer granular aquifers that covers the eastern coastal delta system of R. Nestos. This study demonstrates the results of a series of field measurements (such as geophysical surveys, hydrochemical and isotopical measurements, hydro-meteorological data, land use, irrigation schemes) that were conducted during the period 2009 to 2014. The synthesis of the above resulted in the development of the conceptual model for this aquifer system, that formed the basis for the application of the mathematical model for simulating groundwater flow. The mathematical modeling was achieved using the finite difference method after the application of the USGS code MODFLOW-2005.

Borehole-based study of CO2-rich air transport in the vadose zone of a Mediterranean karst system (Malaga, southern Spain)

2020 ◽  
Author(s):  
Lucía Ojeda ◽  
José Benavente ◽  
Iñaki Vadillo ◽  
Cristina Liñán ◽  
Enrique P. Sanchez-Cañete
Keyword(s):  
Vadose Zone ◽  
Karst Aquifer ◽  
Field Measurements ◽  
Temporal Variations ◽  
Groundwater Levels ◽  
Sources And Sinks ◽  
Global Carbon Budget ◽  
Vertical Heterogeneity ◽  
Test Linking ◽  
Karst Systems

<p>The characterization of CO<sub>2 </sub>transport, and other C compounds (CH<sub>4</sub>, DIC, organic matter, etc.), in the vadose zone of a karst aquifer is key in order to quantify sources and sinks of carbon. In karst environments, most of the studies are focused on the dynamics of CO<sub>2</sub> in caves, but only a few studies are related to field measurements of the CO<sub>2</sub> content in boreholes, which provides direct insights about the vadose zone. Located at the east of the Nerja Cave (Malaga, Andalusia), one of the most important tourist caves in Spain, the vadose zone was accessed by 9 boreholes drilled into the vadose zone of a Triassic carbonate aquifer, with depths ranging between 15 and 30 m. The karst network in the study area is characterized by a great vertical heterogeneity, with significant cavities and voids at specific intervals. Groundwater levels at different altitudes are a consequence of this heterogeneity. Similarly, CO<sub>2</sub> distribution and transport are clearly determined by the complex karst network.</p><p>Our study aims to identify significant horizontal gradients of CO<sub>2</sub> in the karst vadose air, both spatial and temporally. We present monthly measurements of CO<sub>2</sub> concentration, relative humidity, air temperature and <sup>222</sup>Rn inside boreholes. In addition, we present CO<sub>2</sub> results from an 18 hours-atmospheric air injection test. Linking them to the geophysical knowledge of voids in the study area, the results allow us to identify lateral fluxes of CO<sub>2</sub>-rich air in the vadose zone and how these fluxes are favoured by the incidence of the main karst discontinuity orientations. We observe different ventilation patterns:  in spring the vadose air seems to be stored in specific orientations, while in summer there is a lower convective ventilation. The results contribute to explain the temporal variations of the chemical composition of recharge water in karst systems, as well as to support studies on the global carbon budget.</p>

Evaluation of the Conceptual Flow Model for a Deep Vadose Zone System Using Advanced Tensiometers

2004 ◽  
Vol 3 (1) ◽  
pp. 170-182 ◽  
Author(s):  
Deborah L. McElroy ◽  
Joel M. Hubbell
Keyword(s):  
Vadose Zone ◽  
Flow Model

Brine Transport in the Bedded Salt of the Waste Isolation Pilot Plant (wipp): Field Measurements and a Darcy Flow Model

1987 ◽  
Vol 112 ◽  
Author(s):  
David F. Mctigue ◽  
E. James Nowak
Keyword(s):  
Field Experiments ◽  
Flow Model ◽  
Radial Flow ◽  
Field Measurements ◽  
Darcy Flow ◽  
Waste Isolation Pilot Plant ◽  
One Dimensional ◽  
Brine Transport ◽  
Order Of Magnitude ◽  
Linearized Model

AbstractBrine flow has been measured to unheated boreholes for periods of a few days and to heated holes for two years in the WIPP facility. It is proposed that Darcy flow may dominate the observed influx of brine. Exact solutions to a linearized model for one-dimensional, radial flow are evaluated for conditions approximating the field experiments. Flow rates of the correct order of magnitude are calculated for permeabilities in the range 10−21–1020 m2 (1–10 nanodarcy) for both the unheated and heated cases.

Examination of groundwater recharge with a calibrated/validated flow model of the deep vadose zone

2015 ◽  
Vol 522 ◽  
pp. 618-627 ◽  
Author(s):  
T. Turkeltaub ◽  
D. Kurtzman ◽  
G. Bel ◽  
O. Dahan
Keyword(s):  
Groundwater Recharge ◽  
Vadose Zone ◽  
Flow Model

scholarly journals Comparison of soil moisture indices and field measurements in hilly agricultural lands of SW Hungary

2021 ◽  
Vol 15 (1) ◽  
pp. 50-57
Author(s):  
Gábor Nagy ◽  
Dénes Lóczy ◽  
Szabolcs Czigány ◽  
Mauro Hrvatin ◽  
Rok Ciglič
Keyword(s):  
Soil Moisture ◽  
Vadose Zone ◽  
Surface Runoff ◽  
Agricultural Land ◽  
Field Measurements ◽  
Land Use Types ◽  
Remote Sensing Techniques ◽  
Moisture Conditions ◽  
Agricultural Areas ◽  
Moisture Dynamics

The retention of surface runoff and the preservation of soil moisture are among the most important water-related ecosystem services. In addition to field monitoring, advanced remote sensing techniques have been devised to reveal soil moisture dynamics on agricultural land. In our study we compare two soil moisture indices, TWI and SAVI, in three agricultural areas with different land use types. The SAVI has been found suitable to point out spatial variation on the moisture conditions of the vadose zone.

Sign in / Sign up

Export Citation Format

Share Document