Your search found 6 records
1 Vigiak, Olga; Romanowicz, R.; van Loon, E.; Sterk, G.; Beven, K. 2006. A disaggregating approach to describe overland flow occurrence within a catchment. Journal of Hydrology, 323:22-40.
Catchment areas ; Simulation models ; Runoff ; Rain ; Flow ; Infiltration ; Hydrology / Tanzania / Kwalei catchment
(Location: IWMI-HQ Call no: IWMI 551.577 G148 VIG Record No: H039409)
2 Vigiak, Olga; Ribolzi, O.; Pierret, A.; Sengtaheuanghoung, O.; Valentin, Christian. 2008. Trapping efficiencies of cultivated and natural riparian vegetation of northern Laos. Journal of Environmental Quality, 37: 889–897.
Riparian vegetation ; Sedimentation ; Rivers ; Runoff ; Control methods ; Sloping land ; Cultivation ; Rice ; Vegetables ; Teak ; Bananas ; Bamboos / Laos / Houay Pano Catchment
(Location: IWMI HQ Call no: IWMI 631.7.5 G708 VIG Record No: H040503)
In northern Laos, intensification of cultivation on sloping land leads to accelerated erosion processes. Management of riparian land may counteract the negative impacts of higher sediment delivery rates on water quality. This study assessed water and sediment concentration trapping efficiencies of riparian vegetation in northern Laos and the effect of cultivation of riparian land on water quality. Runoff flowing in and out of selected riparian sites was monitored by means of open troughs. In 2005, two native grass, two bamboo, and two banana sites were monitored. In 2006, adjacent to steep banana, bamboo, and native grass sites, three upland rice sites were established and monitored. Water trapping efficiency (WTE) and sediment concentration trapping efficiency (SCTE) were calculated on an event basis; means and 95% confi dence intervals (CIs) were estimated with a bootstrapping approach. Confidence intervals were large and overlapping among sites. Seepage conditions severely limited trapping efficiency. Native grass resulted in the highest WTE (95% CI, -0.10 to 0.23), which was not significantly different from zero. Banana resulted in the highest SCTE (95% CI, 0.06–0.40). Bamboo had negative WTE and SCTE. Median outflow runoff from rice sites was nine times the inflow. Median outflow sediment concentration from rice sites was two to five times that of their adjacent sites and two to five times the inflow sediment concentration. Although lowtillage banana plantation may reduce sediment concentration of runoff, cultivation of annual crops in riparian land leads to delivery of turbid runoff into the stream, thus severely affecting stream water quality.
3 Vigiak, Olga; Ribolzi, Olivier; Valentin, Christian; Sengtaheuanghoung, O. 2007. Hillslope sediment trapping by natural or cultivated riparian vegetation in northern Laos. In Gebbie, L.; Glendinning, A.; Lefroy-Braun, R.; Victor, M. (Eds.). Proceedings of the International Conference on Sustainable Sloping Lands and Watershed Management: Linking Research to Strengthen upland Policies and Practices, National Agriculture and Forestry Research Institute of Lao PDR (NAFRI), Vientiane, Lao PDR, 2007. Vientiane, LAO PDR: National Agriculture and Forestry Research Institute of Lao PDR (NAFRI) pp.121-129.
(Location: IWMI HQ Call no: IWMI 333.91 708 VIG Record No: H041511)
http://www.nafri.org.la/documents/SSLWM/SSLWMpapers/chapter2/ch2_01_vigiak.pdf
https://vlibrary.iwmi.org/pdf/H041511.pdf
https://vlibrary.iwmi.org/pdf/H041511.pdf
4 Vigiak, Olga; Ribolzi, Olivier; Pierret, Alain; Sengtaheuanghoung, O.; Chaplot, Vincent; Valentin, Christian. 2008. Estimation of runoff curve number (CN) of some Laotian land use types. Lao Journal of Agriculture and Forestry, 16:49-60.
(Location: IWMI HQ Call no: e-copy only Record No: H041781)
(0.34 MB)
5 Lestrelin, Guillaume; Pelletreau, A.; Vigiak, Olga; Keohavong, B.; Valentin, Christian. 2008. Integrating scientific and local knowledge of land degradation: a participatory case study in Ban Lak Sip, Lao PDR. Lao Journal of Agriculture and Forestry, Special issue no.17:183-204.
Participatory approaches ; Land degradation ; Farmer participation ; Soil fertility ; Case studies ; Erosion / Laos
(Location: IWMI HQ Call no: e-copy only Record No: H041948)
http://www.nafri.org.la/documents/newsletter/Journal/journal_17/section10.pdf
https://vlibrary.iwmi.org/pdf/H041948.pdf
https://vlibrary.iwmi.org/pdf/H041948.pdf
(0.53 MB)
6 Valentin, Christian; Sengtahevanghoung, O.; Ribolzi, Olivier; Pierret, Alain; Vigiak, Olga. 2008. The MSEC project in the Lao PDR: achievements, ongoing activities and perspectives on sustainable alternative farming practices for the uplands. Lao Journal of Agriculture and Forestry, Special issue no.17:2-30.
Land use ; Soil conservation ; Sloping land ; Erosion ; Shifting cultivation ; Farming systems / Laos / Houay Pano catchment
(Location: IWMI HQ Call no: e-copy only Record No: H041776)
http://www.nafri.org.la/documents/newsletter/Journal/journal_17/section1.pdf
https://vlibrary.iwmi.org/pdf/H041776.pdf
https://vlibrary.iwmi.org/pdf/H041776.pdf
(0.98 MB)
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