scholarly journals General 1-D hydrogeological model for temporal near-surface loess saturation assessment for the needs of radon potential mapping

2021 ◽  
Vol 82 (3) ◽  
pp. 219-221
Author(s):  
Sava Kolev
Keyword(s):  
High Mobility ◽  
Domain Modeling ◽  
Hydrogeological Model ◽  
Saturation State ◽  
Near Surface ◽  
Infiltration Model ◽  
Potential Mapping ◽  
Radon Potential ◽  
Usual State ◽  
Constant Source

Radon gas has high mobility and is driven by advection and diffusion with the soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. Hence the radon potential of the area could be dependent on not only geology as a constant source of radon but also from the changes of the saturation state of the ground. The loess complex, characterized by its permeability and usual state of unsaturation, covers 10% of the Bulgarian territory. The study deals with the principles of unsaturated domain modeling. An attempt of generic vertical infiltration model coinciding with the most upper part of loess vadose zone was performed.

scholarly journals Contribution of top barrier materials to high mobility in near-surface InAs quantum wells grown on GaSb(001)

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Joon Sue Lee ◽  
Borzoyeh Shojaei ◽  
Mihir Pendharkar ◽  
Mayer Feldman ◽  
Kunal Mukherjee ◽  
...  
Keyword(s):  
Quantum Wells ◽  
High Mobility ◽  
Near Surface ◽  
Barrier Materials

Spatial modeling of radon potential mapping using deep learning algorithms

2021 ◽  
pp. 1-23
Author(s):  
Mahdi Panahi ◽  
Peyman Yariyan ◽  
Fatemeh Rezaie ◽  
Sung Won Kim ◽  
Alireza Sharifi ◽  
...  
Keyword(s):  
Deep Learning ◽  
Spatial Modeling ◽  
Learning Algorithms ◽  
Potential Mapping ◽  
Radon Potential

Radon potential mapping in Jangsu-gun, South Korea using probabilistic and deep learning algorithms

2021 ◽  
pp. 118385
Author(s):  
Fatemeh Rezaie ◽  
Mahdi Panahi ◽  
Jongchun Lee ◽  
Jungsub Lee ◽  
Seonhong Kim ◽  
...  
Keyword(s):  
Deep Learning ◽  
South Korea ◽  
Learning Algorithms ◽  
Potential Mapping ◽  
Radon Potential

Aspects of Radon Potential Mapping in Britain

1992 ◽  
Vol 45 (1-4) ◽  
pp. 211-214 ◽  
Author(s):  
T.K. Bull ◽  
D.G. Cameron ◽  
T.B. Colman
Keyword(s):  
Potential Mapping ◽  
Radon Potential

Aspects of Radon Potential Mapping in Britain

1992 ◽  
Vol 45 (1-4) ◽  
pp. 211-214 ◽  
Author(s):  
T.K. Bull ◽  
D.G. Cameron ◽  
T.B. Colman
Keyword(s):  
Potential Mapping ◽  
Radon Potential

scholarly journals Seepage Analysis on the Surface Layer of Multistage Filled Slope with Rainfall Infiltration

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Bingxiang Yuan ◽  
Zengrui Cai ◽  
Mengmeng Lu ◽  
Jianbing Lv ◽  
Zhilei Su ◽  
...  
Keyword(s):  
Rainfall Intensity ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Rainfall Infiltration ◽  
Feature Points ◽  
Saturation State ◽  
Seepage Analysis ◽  
Safety Coefficient ◽  
Infiltration Model ◽  
Saturation Region

Based on the theory of rainfall infiltration, the surface infiltration model of multilevel filled slope was established by using the SEEP/W module of GeoStudio. The changes of the volumetric water content (VWC) and pore water pressure (PWP) in the surface of the slope during the rainfall infiltration were analyzed, and the influence of the change of the rainfall conditions on the VWC and PWP was considered. The analysis showed that VWC and PWP increased when the rain fell, and the growth rate of the higher feature point was higher. The affected area was concentrated on the upper part of the surface about 0.75 m. With the increasing of rainfall intensity, the slope surface getting to transient saturation state was quick, and the time of the PWP increasing to 0 among the feature points of same elevation was shortened. Meanwhile, the PWP presented a positive value, and as the infiltration depth increased, the transient saturation region expanded. The safety coefficient of the multistage filled slope was continuously reduced; after the stop of rainfall, the VWC and the PWP decreased, and the decline rate of the higher feature points was higher. In addition, the PWP of the lower part increased, and the safety factor of the slope presented a trend of rebound.

scholarly journals Radon potential mapping in Piemonte (North-West Italy): An experimental approach

2012 ◽  
Vol 24 ◽  
pp. 06003
Author(s):  
E. Chiaberto ◽  
M. Magnoni ◽  
E. Serena ◽  
S. Procopio ◽  
A. Prandstatter ◽  
...  
Keyword(s):  
Experimental Approach ◽  
North West ◽  
Potential Mapping ◽  
Radon Potential

scholarly journals Analysis of the hydrogeological conditions in Bulgaria in connection with the radon potential

2021 ◽  
Vol 82 (3) ◽  
pp. 201-203
Author(s):  
Dimitar Antonov ◽  
Mila Trayanova ◽  
Sava Kolev ◽  
Aglaida Toteva ◽  
Aleksey Benderev ◽  
...  
Keyword(s):  
Noble Gas ◽  
High Mobility ◽  
Groundwater Table ◽  
Soil Gas ◽  
Hydrogeological Conditions ◽  
Different Types ◽  
Screening Assessment ◽  
Diffusion And Convection ◽  
Radon Potential ◽  
226Ra Content

Natural radon (222Rn) is a radioactive noble gas that occurs in every rock or soil due to the content of radium (226Ra), part of the 238U family, in the lithosphere. Different types of rocks and soils possess different 226Ra content and different permeability. Radon has high mobility and is driven by diffusion and convection with the soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. Therefore, the radon potential of the area could depend on hydrogeology and its particular settings. The study deals with the general characteristics of the groundwater depths in Bulgaria based on the published since 1960’s sources. After analysis of the collected data several distinct regions have been elaborated based on different depth of the groundwater table regarding lithological, tectonic and geomorphological conditions. In addition, zones for screening assessment of groundwater table influence of radon potential have been precised.

scholarly journals Review of investigations into the vadose zone’s variable state of saturation in connection with the assessment of radon potential in Bulgaria

2021 ◽  
Vol 50 (2) ◽  
pp. 47-51
Author(s):  
Bistra Kunovska ◽  
Mila Trayanova ◽  
Monika Mutovska ◽  
Simeon Valchev ◽  
Boyka Mihaylova
Keyword(s):  
Water Saturation ◽  
Noble Gas ◽  
Decay Product ◽  
Surface Layers ◽  
Near Surface ◽  
Research Activities ◽  
Radon Potential ◽  
And Diffusion ◽  
Moisture Dynamics

Natural radon (222Rn) is a radioactive noble gas that occurs as the immediate decay product of radium (226Ra), part of the 238U family, in the lithosphere. Radon is driven by advection and diffusion with soil gas throughout connected and water-unsaturated pores and/or cracks in permeable rocks and soils. The aim of the present study is to do a review of the existing so far research activities in Bulgaria in connection with the observation and/or evaluation of the degree of water saturation of the near-surface layer, and on that base to distinguish the up-to-date achievements in regards to the radon potential in situ evaluation. Due to this review, the studies in Bulgaria concerning moisture dynamics in the near-surface layers can be divided mainly into two groups. The first one investigates the hydraulic characteristics (parameters) of soils in the vadose zone. Based on that, conclusions or computer simulations for the saturation degree estimation can be drawn. The other group includes in situ observations by sensors on the change of moisture with time. The results of these studies may serve as a base for more precise moisture dynamics assessment at sites with specific radon potential tendencies.

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