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Seepage weathering impacts on erosivity of arid stream banks: A new conceptual model
Year:
2016
Source of publication :
Geomorphology
Authors :
Nachshon, Uri
;
.
Volume :
261
Co-Authors:
Nachshon, U., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Research Center, Bet-Dagan, Israel
Facilitators :
From page:
212
To page:
221
(
Total pages:
10
)
Abstract:
Field observations have indicated the formation of horizontal, pipe shape cavities, along gully and dry stream channel banks in the semi-arid region of the northern Negev Desert, Israel. Piping is a well-known phenomenon in humid regions due to subsurface water flow and seepage weathering. However, in dry environments where rain events are scarce and subsurface water flow is rare, it is proposed here that capillary flow of saline water in the vadose zone leads to similar processes. It is suggested that where saline and shallow ground water persists, capillary flow may result in salt accumulation and precipitation at the top of the capillary fringe, consequently rendering this zone to be more susceptible to erosion. A conceptual model is presented and field observations, laboratory experiments, and a physically-based model are used to prove the feasibility of the proposed conceptual model and to explain why salts accumulate at the top of the capillary fringe, even though evaporation acts all along the vertical stream channel or gully banks. It is suggested that the low evaporative flux, in comparison to the liquid water flux, disables salt accumulation along the profile to the top of the capillary fringe where the liquid water flux is minimal. The presented findings strengthen the conceptual model, but thorough field studies are needed to estimate the impact of the proposed mechanism on erosion processes on a field scale. © 2016 Elsevier B.V.
Note:
Related Files :
bank erosion
conceptual framework
Israel
Negev
Pipe erosion
Solute transport
vadose zone
water flow
weathering
Show More
Related Content
More details
DOI :
10.1016/j.geomorph.2016.03.011
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21888
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:47
Scientific Publication
Seepage weathering impacts on erosivity of arid stream banks: A new conceptual model
261
Nachshon, U., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Research Center, Bet-Dagan, Israel
Seepage weathering impacts on erosivity of arid stream banks: A new conceptual model
Field observations have indicated the formation of horizontal, pipe shape cavities, along gully and dry stream channel banks in the semi-arid region of the northern Negev Desert, Israel. Piping is a well-known phenomenon in humid regions due to subsurface water flow and seepage weathering. However, in dry environments where rain events are scarce and subsurface water flow is rare, it is proposed here that capillary flow of saline water in the vadose zone leads to similar processes. It is suggested that where saline and shallow ground water persists, capillary flow may result in salt accumulation and precipitation at the top of the capillary fringe, consequently rendering this zone to be more susceptible to erosion. A conceptual model is presented and field observations, laboratory experiments, and a physically-based model are used to prove the feasibility of the proposed conceptual model and to explain why salts accumulate at the top of the capillary fringe, even though evaporation acts all along the vertical stream channel or gully banks. It is suggested that the low evaporative flux, in comparison to the liquid water flux, disables salt accumulation along the profile to the top of the capillary fringe where the liquid water flux is minimal. The presented findings strengthen the conceptual model, but thorough field studies are needed to estimate the impact of the proposed mechanism on erosion processes on a field scale. © 2016 Elsevier B.V.
Scientific Publication
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