Characterization of Preferential Flow Pathways through Paddy Bunds with Dye Tracer Tests

2008 ◽  
Vol 72 (6) ◽  
pp. 1756-1766 ◽  
Author(s):  
Manon Janssen ◽  
Bernd Lennartz
Keyword(s):  
Preferential Flow ◽  
Tracer Tests ◽  
Dye Tracer ◽  
Flow Pathways ◽  
Preferential Flow Pathways

scholarly journals The role of heterogeneous lithology in a glaciofluvial deposit on unsaturated preferential flow – a numerical study

2017 ◽  
Vol 65 (3) ◽  
pp. 209-221 ◽  
Author(s):  
Erij Ben Slimene ◽  
Laurent Lassabatere ◽  
Jiří Šimůnek ◽  
Thierry Winiarski ◽  
Remy Gourdon
Keyword(s):  
Urban Areas ◽  
Hydraulic Properties ◽  
Preferential Flow ◽  
Numerical Study ◽  
Full Characterization ◽  
Capillary Barriers ◽  
Flow Pathways ◽  
Preferential Flow Pathways

AbstractAn understanding of preferential flow in the vadose zone is crucial for the prediction of the fate of pollutants. Infiltration basins, developed to mitigate the adverse effects of impervious surfaces in urban areas, are established above strongly heterogeneous and highly permeable deposits and thus are prone to preferential flow and enhanced pollutant transport. This study numerically investigates the establishment of preferential flow in an infiltration basin in the Lyon suburbs (France) established over a highly heterogeneous glaciofluvial deposit covering much of the Lyon region. An investigation of the soil transect (13.5 m long and 2.5 m deep) provided full characterization of lithology and hydraulic properties of present lithofacies. Numerical modeling with the HYDRUS-2D model of water flow in the transect was used to identify the effects of individual lithofacies that constitute the deposit. Multiple scenarios that considered different levels of heterogeneity were evaluated. Preferential flow was studied for several values of infiltration rates applied after a long dry period. The numerical study shows that the high contrast in hydraulic properties of different lithofacies triggers the establishment of preferential flow (capillary barriers and funneled flow). Preferential flow develops mainly for low water fluxes imposed at the surface. The role of individual lithofacies in triggering preferential flow depends on their shapes (layering versus inclusions) and their sizes. While lenses and inclusions produce preferential flow pathways, the presence of the surface layer has no effect on the development of preferential flow and it only affects the effective hydraulic conductivity of the heterogeneous transect.

scholarly journals An Innovative Approach for Locating and Evaluating Subsurface Pathways for Nitrogen Loss

2001 ◽  
Vol 1 ◽  
pp. 223-229 ◽  
Author(s):  
C.L. Walthall ◽  
T.J. Gish ◽  
C.S.T. Daughtry ◽  
W.P. Dulaney ◽  
K.-J.S. Kung ◽  
...  
Keyword(s):  
Management Practices ◽  
Preferential Flow ◽  
Agricultural Research ◽  
Nitrogen Loss ◽  
Flow Behavior ◽  
Chemical Contamination ◽  
Riparian Wetland ◽  
Flow Pathways ◽  
Preferential Flow Pathways

Fundamental watershed-scale processes governing chemical flux to neighboring ecosystems are so poorly understood that effective strategies for mitigating chemical contamination cannot be formulated. Characterization of evapotranspiration, surface runoff, plant uptake, subsurface preferential flow, behavior of the chemicals in neighboring ecosystems, and an understanding of how crop management practices influence these processes are needed. Adequate characterization of subsurface flow has been especially difficult because conventional sampling methods are ineffective for measuring preferential flow of water and solutes. A sampling strategy based on ground-penetrating radar (GPR) mapping of subsurface structures coupled with near real-time soil moisture data, surface topography, remotely sensed imagery, and a geographic information system (GIS) appears to offer a means of accurately identifying subsurface preferential flow pathways. Four small adjacent watersheds draining into a riparian wetland and first-order stream at the USDA-ARS Beltsville Agricultural Research Center, Beltsville, MD are being studied with this protocol. The spatial location of some preferential flow pathways for chemicals exiting these agricultural watersheds to the neighboring ecosystems have been identified. Confirmation of the pathways is via examination of patterns in yield monitor data and remote sensing imagery.

scholarly journals Detecting infiltrated water and preferential flow pathways through time-lapse ground-penetrating radar surveys

2020 ◽  
Vol 726 ◽  
pp. 138511 ◽  
Author(s):  
Simone Di Prima ◽  
Thierry Winiarski ◽  
Rafael Angulo-Jaramillo ◽  
Ryan D. Stewart ◽  
Mirko Castellini ◽  
...  
Keyword(s):  
Ground Penetrating Radar ◽  
Preferential Flow ◽  
Time Lapse ◽  
Flow Pathways ◽  
Preferential Flow Pathways ◽  
Ground Penetrating

scholarly journals Phosphorus in Preferential Flow Pathways of Forest Soils in Germany

Forests ◽  
2016 ◽  
Vol 8 (1) ◽  
pp. 19 ◽  
Author(s):  
Dorit Julich ◽  
Stefan Julich ◽  
Karl-Heinz Feger
Keyword(s):  
Forest Soils ◽  
Preferential Flow ◽  
Flow Pathways ◽  
Preferential Flow Pathways
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