Details
| Original language | English |
|---|---|
| Pages (from-to) | 133-140 |
| Number of pages | 8 |
| Journal | Journal of Hydrology and Hydromechanics |
| Volume | 64 |
| Issue number | 2 |
| Publication status | Published - 1 Jun 2016 |
| Externally published | Yes |
Abstract
The biological soil crusts (BSCs) in the NW Negev cause local water redistribution by increasing surface runoff. The effects of pore clogging and swelling of organic and inorganic crust components were intensively investigated in earlier studies. However, the effect of water repellency (WR) was not addressed systematically yet. This study investigates subcritical WR of BSCs in three different study sites in the NW Negev. For this purpose, three common methods to determine soil WR were used: (i) the repellency index (RI) method (ii) the water drop penetration time (WDPT) test and (iii) the Wilhelmy plate method (WPM). Furthermore, the potential influence of WR on local water redistribution is discussed and the applied methods are compared. We found the BSC to be subcritically water repellent. The degree of WR may only affect water redistribution on a microscale and has little influence on the ecosystem as a whole. The RI method was clearly the most appropriate to use, whereas the WDPT and the WPM failed to detect subcritical WR.
Keywords
- Hydrophobicity, Infiltration, Reduced wettability, Surface runoff, Water repellency index
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
- Engineering(all)
- Mechanical Engineering
- Chemical Engineering(all)
- Fluid Flow and Transfer Processes
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In: Journal of Hydrology and Hydromechanics, Vol. 64, No. 2, 01.06.2016, p. 133-140.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Biological soil crusts cause subcritical water repellency in a sand dune ecosystem located along a rainfall gradient in the NW Negev desert, Israel
AU - Keck, Hannes
AU - Felde, Vincent John Martin Noah Linus
AU - Drahorad, Sylvie Laureen
AU - Felix-Henningsen, Peter
N1 - Publisher Copyright: © 2016 Hannes Keck et al., published by De Gruyter Open.
PY - 2016/6/1
Y1 - 2016/6/1
N2 - The biological soil crusts (BSCs) in the NW Negev cause local water redistribution by increasing surface runoff. The effects of pore clogging and swelling of organic and inorganic crust components were intensively investigated in earlier studies. However, the effect of water repellency (WR) was not addressed systematically yet. This study investigates subcritical WR of BSCs in three different study sites in the NW Negev. For this purpose, three common methods to determine soil WR were used: (i) the repellency index (RI) method (ii) the water drop penetration time (WDPT) test and (iii) the Wilhelmy plate method (WPM). Furthermore, the potential influence of WR on local water redistribution is discussed and the applied methods are compared. We found the BSC to be subcritically water repellent. The degree of WR may only affect water redistribution on a microscale and has little influence on the ecosystem as a whole. The RI method was clearly the most appropriate to use, whereas the WDPT and the WPM failed to detect subcritical WR.
AB - The biological soil crusts (BSCs) in the NW Negev cause local water redistribution by increasing surface runoff. The effects of pore clogging and swelling of organic and inorganic crust components were intensively investigated in earlier studies. However, the effect of water repellency (WR) was not addressed systematically yet. This study investigates subcritical WR of BSCs in three different study sites in the NW Negev. For this purpose, three common methods to determine soil WR were used: (i) the repellency index (RI) method (ii) the water drop penetration time (WDPT) test and (iii) the Wilhelmy plate method (WPM). Furthermore, the potential influence of WR on local water redistribution is discussed and the applied methods are compared. We found the BSC to be subcritically water repellent. The degree of WR may only affect water redistribution on a microscale and has little influence on the ecosystem as a whole. The RI method was clearly the most appropriate to use, whereas the WDPT and the WPM failed to detect subcritical WR.
KW - Hydrophobicity
KW - Infiltration
KW - Reduced wettability
KW - Surface runoff
KW - Water repellency index
UR - http://www.scopus.com/inward/record.url?scp=84970974459&partnerID=8YFLogxK
U2 - 10.1515/johh-2016-0001
DO - 10.1515/johh-2016-0001
M3 - Article
AN - SCOPUS:84970974459
VL - 64
SP - 133
EP - 140
JO - Journal of Hydrology and Hydromechanics
JF - Journal of Hydrology and Hydromechanics
SN - 0042-790X
IS - 2
ER -