Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.agee.2004.01.012
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dc.titleToward understanding the cumulative impacts of roads in upland agricultural watersheds of northern Thailand
dc.contributor.authorZiegler, A.D.
dc.contributor.authorGiambelluca, T.W.
dc.contributor.authorSutherland, R.A.
dc.contributor.authorNullet, M.A.
dc.contributor.authorYarnasarn, S.
dc.contributor.authorPinthong, J.
dc.contributor.authorPreechapanya, P.
dc.contributor.authorJaiaree, S.
dc.date.accessioned2011-05-03T06:49:18Z
dc.date.available2011-05-03T06:49:18Z
dc.date.issued2004
dc.identifier.citationZiegler, A.D., Giambelluca, T.W., Sutherland, R.A., Nullet, M.A., Yarnasarn, S., Pinthong, J., Preechapanya, P., Jaiaree, S. (2004). Toward understanding the cumulative impacts of roads in upland agricultural watersheds of northern Thailand. Agriculture, Ecosystems and Environment 104 (1) : 145-158. ScholarBank@NUS Repository. https://doi.org/10.1016/j.agee.2004.01.012
dc.identifier.issn01678809
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/22191
dc.description.abstractThis paper describes the interactions of various physical processes that allow unpaved roads to contribute disproportionately to basin-wide runoff and stream sediment in the 93.7 ha Pang Khum Experimental Watershed (PKEW) in northern Thailand. Many road sections in PKEW are constant sources of sediment entering the stream during most rain events because: (1) Horton overland flow is generated on the compacted surfaces after small depths of rainfall; (2) surface preparation processes, including vehicle detachment and maintenance activities, renew the supply of easily transportable surface sediment on inter- and intra-storm time scales; (3) erosion of the road surface is accelerated in locations where slopes are steep, overland flow distances are long, and/or vehicle usage is high; (4) surface runoff typically exits from the road directly into the stream. Owing to these collective processes, sediment delivery rate on PKEW roads is more than an order of magnitude higher than that on adjacent fields (≈120 Mg ha-1 per year versus 9 Mg ha-1 per year). Thus, unpaved roads appear to be on the same order of importance as agricultural lands in contributing sediment to the stream network, despite occupying a fraction of the total surface area in the basin (≈0.5% versus 12%). A more thorough assessment of linkages between all hillslope runoff/sediment sources and the stream network, however, is still needed to fully evaluate the relative impacts of roads versus those of agriculture practices in PKEW. © 2004 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.agee.2004.01.012
dc.sourceScopus
dc.subjectErosion
dc.subjectLand degradation
dc.subjectSE Asia
dc.subjectTropical hydrology/geomorphology
dc.subjectUnpaved roads
dc.typeConference Paper
dc.contributor.departmentGEOGRAPHY
dc.description.doi10.1016/j.agee.2004.01.012
dc.description.sourcetitleAgriculture, Ecosystems and Environment
dc.description.volume104
dc.description.issue1
dc.description.page145-158
dc.description.codenAEEND
dc.identifier.isiut000224624600013
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