נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Desiccation-crack-induced salinization in deep clay sediment
Year:
2013
Authors :
קורצמן, דניאל
;
.
Volume :
17
Co-Authors:

Baram, S., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel
Ronen, Z., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel
Kurtzman, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Külls, C., Institute for Hydrology, Albert-Ludwigs-University Freiburg, Fahnenbergplatz, 79098 Freiburg, Germany
Dahan, O., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel

Facilitators :
From page:
1533
To page:
1545
(
Total pages:
13
)
Abstract:

A study on water infiltration and solute transport in a clayey vadose zone underlying a dairy farm waste source was conducted to assess the impact of desiccation cracks on subsurface evaporation and salinization. The study is based on five years of continuous measurements of the temporal variation in the vadose zone water content and on the chemical and isotopic composition of the sediment and pore water in it. The isotopic composition of water stable isotopes (δ18O and δ2H) in water and sediment samples, from the area where desiccation crack networks prevail, indicated subsurface evaporation down to ∼ 3.5 m below land surface, and vertical and lateral preferential transport of water, following erratic preferential infiltration events. Chloride (Cl-) concentrations in the vadose zone pore water substantially increased with depth, evidence of deep subsurface evaporation and down flushing of concentrated solutions from the evaporation zones during preferential infiltration events. These observations led to development of a desiccation-crack-induced salinization (DCIS) conceptual model. DCIS suggests that thermally driven convective air flow in the desiccation cracks induces evaporation and salinization in relatively deep sections of the subsurface. This conceptual model supports previous conceptual models on vadose zone and groundwater salinization in fractured rock in arid environments and extends its validity to clayey soils in semi-arid environments. © 2013 Author(s).

Note:
Related Files :
arid environment
dairy farming
groundwater
Salinization
Sedimentology
temporal variation
vadose zone
עוד תגיות
תוכן קשור
More details
DOI :
10.5194/hess-17-1533-2013
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
32798
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:12
Scientific Publication
Desiccation-crack-induced salinization in deep clay sediment
17

Baram, S., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel
Ronen, Z., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel
Kurtzman, D., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Külls, C., Institute for Hydrology, Albert-Ludwigs-University Freiburg, Fahnenbergplatz, 79098 Freiburg, Germany
Dahan, O., Department of Environmental Hydrology and Microbiology, Sede Boqer Campus, Ben-Gurion University, Negev 84990, Israel

Desiccation-crack-induced salinization in deep clay sediment

A study on water infiltration and solute transport in a clayey vadose zone underlying a dairy farm waste source was conducted to assess the impact of desiccation cracks on subsurface evaporation and salinization. The study is based on five years of continuous measurements of the temporal variation in the vadose zone water content and on the chemical and isotopic composition of the sediment and pore water in it. The isotopic composition of water stable isotopes (δ18O and δ2H) in water and sediment samples, from the area where desiccation crack networks prevail, indicated subsurface evaporation down to ∼ 3.5 m below land surface, and vertical and lateral preferential transport of water, following erratic preferential infiltration events. Chloride (Cl-) concentrations in the vadose zone pore water substantially increased with depth, evidence of deep subsurface evaporation and down flushing of concentrated solutions from the evaporation zones during preferential infiltration events. These observations led to development of a desiccation-crack-induced salinization (DCIS) conceptual model. DCIS suggests that thermally driven convective air flow in the desiccation cracks induces evaporation and salinization in relatively deep sections of the subsurface. This conceptual model supports previous conceptual models on vadose zone and groundwater salinization in fractured rock in arid environments and extends its validity to clayey soils in semi-arid environments. © 2013 Author(s).

Scientific Publication
You may also be interested in