Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jhydrol.2003.09.027
DC FieldValue
dc.titleHydrological consequences of landscape fragmentation in mountainous northern Vietnam: Evidence of accelerated overland flow generation
dc.contributor.authorZiegler, A.D.
dc.contributor.authorGiambelluca, T.W.
dc.contributor.authorVana, T.T.
dc.contributor.authorNullet, M.A.
dc.contributor.authorTran, L.T.
dc.contributor.authorFox, J.
dc.contributor.authorVien, T.D.
dc.contributor.authorPinthong, J.
dc.contributor.authorMaxwell, J.F.
dc.contributor.authorEvett, S.
dc.date.accessioned2011-05-03T06:49:08Z
dc.date.available2011-05-03T06:49:08Z
dc.date.issued2004
dc.identifier.citationZiegler, A.D., Giambelluca, T.W., Vana, T.T., Nullet, M.A., Tran, L.T., Fox, J., Vien, T.D., Pinthong, J., Maxwell, J.F., Evett, S. (2004). Hydrological consequences of landscape fragmentation in mountainous northern Vietnam: Evidence of accelerated overland flow generation. Journal of Hydrology 287 (1-4) : 124-146. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jhydrol.2003.09.027
dc.identifier.issn00221694
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/22180
dc.description.abstractMeasurements of saturated hydraulic conductivity (Ks) and indices of Horton overland flow (HOF) generation are used to assess the influence of landscape fragmentation on near-surface hydrologic response in two upland watersheds in northern Vietnam. The fragmented landscape, which results from timber extraction and swidden agriculture, is a mosaic of surfaces having distinct infiltration characteristics. In general, human activity has reduced infiltration and altered near-surface flow paths on all disturbed land covers. Compacted roads, paths, and dwelling sites, for example, have the propensity to generate HOF for small rainfall depths. Although these surfaces occupy a small fraction of a basin land area (estimated at <1%), they contribute disproportionately to overland flow response during typical rainfall events. Recently abandoned fields have the lowest Ks of all non-consolidated, post-cultivation surfaces tested. Beginning 1-2 years following abandonment, diminished Ks recovers over time with the succession to more advanced types of secondary regrowth. If a grassland emerges on the abandoned site, rather than a bamboo-dominated cover, Ks recovers more rapidly. The decrease in Ks with depth below disturbed surfaces is more acute than that found at undisturbed sites. This enhanced anisotropy in near-surface Ks increases the likelihood of the development of a lateral subsurface flow component during large storms of the monsoon rain season. Subsequently, the likelihood of return flow generation is increased. Because the recovery time of subsurface Ks is greater than that for the surface Ks, the impact human activity has on hydrologic response in the fragmented basin may linger long after the surface vegetation has evolved to a mature forested association. © 2003 Elsevier B.V. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jhydrol.2003.09.027
dc.sourceScopus
dc.subjectDeforestation
dc.subjectDisk permeameter
dc.subjectImperata cylindrica
dc.subjectInfiltration
dc.subjectLand-cover change
dc.subjectSaturated hydraulic conductivity
dc.subjectSE Asia
dc.subjectTropical watershed hydrology
dc.typeArticle
dc.contributor.departmentGEOGRAPHY
dc.description.doi10.1016/j.jhydrol.2003.09.027
dc.description.sourcetitleJournal of Hydrology
dc.description.volume287
dc.description.issue1-4
dc.description.page124-146
dc.description.codenJHYDA
dc.identifier.isiut000220153300008
Appears in Collections:Staff Publications

Show simple item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

111
checked on Aug 17, 2019

WEB OF SCIENCETM
Citations

101
checked on Aug 9, 2019

Page view(s)

240
checked on Aug 19, 2019

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.