Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland

L. K. Deeks, A. Glyn Bengough, D. Low, M. F. Billett, Xiaoxian Zhang, John W. Crawford, J. M. Chessell, Iain M. Young

Research output: Contribution to journalArticle

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Abstract

Spatial and temporal measurements of shallow sub-surface soil physical properties were made within a 1 km2 upland catchment. The surface soil layer of the catchment was organic rich (>70% organic matter) with a corresponding total porosity of 81%. Monthly point observations of volumetric water content ([theta]) were combined with point estimates of total porosity ([var epsilon]) and the porosity 1. A correlation between water content and discharge was found, with discharge increasing rapidly when [theta]/[var epsilon]residual approached unity. Similar relationships between water content and catchment discharge were identified for soil units adjacent to the stream when [theta]/[var epsilon]residual approached unity. These data suggest that soil pores >50 [mu]m are of crucial importance in determining catchment discharge. Spatial and temporal variations in soil properties related to moisture content of the soil were also observed. Under dry conditions, a clear division based on aspect was noted, the west-facing side of the catchment being wettest. In wetter months, total porosity and soil water content were significantly affected by soil type and the spatial pattern of soil water content was more variable than in the dryer months. The physical quantification of soil properties in the shallow sub-surface layer proved important in explaining different initial changes in discharge from the catchment in response to a rainfall event.
Original languageEnglish
Pages (from-to)217-228
Number of pages12
JournalJournal of Hydrology
Volume290
Issue number3-4
DOIs
StatePublished - May 2004

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catchment
water content
porosity
soil
soil property
soil surface
spatial variation
soil water
headwater
soil type
surface layer
moisture content
temporal variation
physical property
organic matter
rainfall

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Deeks, L. K., Bengough, A. G., Low, D., Billett, M. F., Zhang, X., Crawford, J. W., ... Young, I. M. (2004). Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland. Journal of Hydrology, 290(3-4), 217-228. DOI: 10.1016/j.jhydrol.2003.12.008

Deeks, L. K.; Bengough, A. Glyn; Low, D.; Billett, M. F.; Zhang, Xiaoxian; Crawford, John W.; Chessell, J. M.; Young, Iain M. / Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland.

In: Journal of Hydrology, Vol. 290, No. 3-4, 05.2004, p. 217-228.

Research output: Contribution to journalArticle

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abstract = "Spatial and temporal measurements of shallow sub-surface soil physical properties were made within a 1 km2 upland catchment. The surface soil layer of the catchment was organic rich (>70% organic matter) with a corresponding total porosity of 81%. Monthly point observations of volumetric water content ([theta]) were combined with point estimates of total porosity ([var epsilon]) and the porosity 1. A correlation between water content and discharge was found, with discharge increasing rapidly when [theta]/[var epsilon]residual approached unity. Similar relationships between water content and catchment discharge were identified for soil units adjacent to the stream when [theta]/[var epsilon]residual approached unity. These data suggest that soil pores >50 [mu]m are of crucial importance in determining catchment discharge. Spatial and temporal variations in soil properties related to moisture content of the soil were also observed. Under dry conditions, a clear division based on aspect was noted, the west-facing side of the catchment being wettest. In wetter months, total porosity and soil water content were significantly affected by soil type and the spatial pattern of soil water content was more variable than in the dryer months. The physical quantification of soil properties in the shallow sub-surface layer proved important in explaining different initial changes in discharge from the catchment in response to a rainfall event.",
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Deeks, LK, Bengough, AG, Low, D, Billett, MF, Zhang, X, Crawford, JW, Chessell, JM & Young, IM 2004, 'Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland' Journal of Hydrology, vol 290, no. 3-4, pp. 217-228. DOI: 10.1016/j.jhydrol.2003.12.008

Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland. / Deeks, L. K.; Bengough, A. Glyn; Low, D.; Billett, M. F.; Zhang, Xiaoxian; Crawford, John W.; Chessell, J. M.; Young, Iain M.

In: Journal of Hydrology, Vol. 290, No. 3-4, 05.2004, p. 217-228.

Research output: Contribution to journalArticle

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AU - Deeks,L. K.

AU - Bengough,A. Glyn

AU - Low,D.

AU - Billett,M. F.

AU - Zhang,Xiaoxian

AU - Crawford,John W.

AU - Chessell,J. M.

AU - Young,Iain M.

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AB - Spatial and temporal measurements of shallow sub-surface soil physical properties were made within a 1 km2 upland catchment. The surface soil layer of the catchment was organic rich (>70% organic matter) with a corresponding total porosity of 81%. Monthly point observations of volumetric water content ([theta]) were combined with point estimates of total porosity ([var epsilon]) and the porosity 1. A correlation between water content and discharge was found, with discharge increasing rapidly when [theta]/[var epsilon]residual approached unity. Similar relationships between water content and catchment discharge were identified for soil units adjacent to the stream when [theta]/[var epsilon]residual approached unity. These data suggest that soil pores >50 [mu]m are of crucial importance in determining catchment discharge. Spatial and temporal variations in soil properties related to moisture content of the soil were also observed. Under dry conditions, a clear division based on aspect was noted, the west-facing side of the catchment being wettest. In wetter months, total porosity and soil water content were significantly affected by soil type and the spatial pattern of soil water content was more variable than in the dryer months. The physical quantification of soil properties in the shallow sub-surface layer proved important in explaining different initial changes in discharge from the catchment in response to a rainfall event.

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T2 - Journal of Hydrology

JF - Journal of Hydrology

SN - 0022-1694

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ER -

Deeks LK, Bengough AG, Low D, Billett MF, Zhang X, Crawford JW et al. Spatial variation of effective porosity and its implications for discharge in an upland headwater catchment in Scotland. Journal of Hydrology. 2004 May;290(3-4):217-228. Available from, DOI: 10.1016/j.jhydrol.2003.12.008