Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam
A small agricultural watershed on sloping lands (around 50 ha) in Northern Vietnam is equipped with 5 runoff measurement stations named weir. Each weir is representative of one vegetation cover (forest, fodder, cassava and old fallow). There is no relationship between bed load and rainfall amount du...
| Autores principales: | , , , , , |
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| Formato: | Conference Paper |
| Lenguaje: | Francés |
| Publicado: |
2007
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/38606 |
| _version_ | 1855533793317748736 |
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| author | Orange, Didier Phan, Ha Hai An Lequeux, Brice Henry des Tureaux, Thierry Pham, Van Rinh Tran Duc Toan |
| author_browse | Henry des Tureaux, Thierry Lequeux, Brice Orange, Didier Pham, Van Rinh Phan, Ha Hai An Tran Duc Toan |
| author_facet | Orange, Didier Phan, Ha Hai An Lequeux, Brice Henry des Tureaux, Thierry Pham, Van Rinh Tran Duc Toan |
| author_sort | Orange, Didier |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | A small agricultural watershed on sloping lands (around 50 ha) in Northern Vietnam is equipped with 5 runoff measurement stations named weir. Each weir is representative of one vegetation cover (forest, fodder, cassava and old fallow). There is no relationship between bed load and rainfall amount due to a threshold process, but it is directly linked to the vegetation cover. In 2006, bed load losses are quite much important on the cassava crop (879 kg/ha/yr) than at the other weirs: 131 kg/ha/yr for old fallow, 83 kg/ha/yr for pluriannual plantation and 52 kg/ha/yr for forest. From some event measurements, the mean suspended load during the rising peak was a range 0.4-2.9 g/l with a SM peak around 3 to 8 g/l; the suspended load during the base flow was around 10-20 mg/l. It is impossible to predict the SM load with the discharge. For each weir, the best correlation is between SM load and Rindex emphasizing the duration and the amount of the rain event. The calculation of suspended load confirms the soil loss by suspended load is much more important than by bed load, even if the 95% of suspended load occurs during the peak events. On the whole watershed, the erosion amount by suspended load is 1.2 t/ha for 0.6 t/ha for bed load. More trees are in the basin, less is the suspended load; and at the opposite, the agricultural practices increase the amount of suspended load. |
| format | Conference Paper |
| id | CGSpace38606 |
| institution | CGIAR Consortium |
| language | Francés |
| publishDate | 2007 |
| publishDateRange | 2007 |
| publishDateSort | 2007 |
| record_format | dspace |
| spelling | CGSpace386062025-06-12T09:17:16Z Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam Orange, Didier Phan, Ha Hai An Lequeux, Brice Henry des Tureaux, Thierry Pham, Van Rinh Tran Duc Toan watersheds sloping land erosion runoff weirs vegetation cassava A small agricultural watershed on sloping lands (around 50 ha) in Northern Vietnam is equipped with 5 runoff measurement stations named weir. Each weir is representative of one vegetation cover (forest, fodder, cassava and old fallow). There is no relationship between bed load and rainfall amount due to a threshold process, but it is directly linked to the vegetation cover. In 2006, bed load losses are quite much important on the cassava crop (879 kg/ha/yr) than at the other weirs: 131 kg/ha/yr for old fallow, 83 kg/ha/yr for pluriannual plantation and 52 kg/ha/yr for forest. From some event measurements, the mean suspended load during the rising peak was a range 0.4-2.9 g/l with a SM peak around 3 to 8 g/l; the suspended load during the base flow was around 10-20 mg/l. It is impossible to predict the SM load with the discharge. For each weir, the best correlation is between SM load and Rindex emphasizing the duration and the amount of the rain event. The calculation of suspended load confirms the soil loss by suspended load is much more important than by bed load, even if the 95% of suspended load occurs during the peak events. On the whole watershed, the erosion amount by suspended load is 1.2 t/ha for 0.6 t/ha for bed load. More trees are in the basin, less is the suspended load; and at the opposite, the agricultural practices increase the amount of suspended load. 2007 2014-06-13T11:42:30Z 2014-06-13T11:42:30Z Conference Paper https://hdl.handle.net/10568/38606 fr Limited Access Orange, Didier; Phan, Ha Hai An; Lequeux, Brice; Henry des Tureaux, Thierry; Pham, Van Rinh; Toan, T. D. 2007. Charges de fond et suspensions transportees par les eaux decoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam. Gestion integree des eaux et des sols: ressources, amenagements et risques en milieux ruraux et urbains, Editions AUF et IRD, Hanoi, Actes des Premieres Journees Scientifiques Inter- Reseaux de l AUF, Hanoi, 6-9 novembre 2007; Paper presented at Conference, Integrated Management of Waters and Soils: resources, infrastructures and risks in rural and urban areas, Hanoi, Vietnam, 6-9 November 2007. 6p. |
| spellingShingle | watersheds sloping land erosion runoff weirs vegetation cassava Orange, Didier Phan, Ha Hai An Lequeux, Brice Henry des Tureaux, Thierry Pham, Van Rinh Tran Duc Toan Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title | Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title_full | Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title_fullStr | Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title_full_unstemmed | Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title_short | Charges de fond et suspensions transportees par les eaux d'ecoulement dans un petit bassin versant agricole sur pentes dans le Nord Vietnam |
| title_sort | charges de fond et suspensions transportees par les eaux d ecoulement dans un petit bassin versant agricole sur pentes dans le nord vietnam |
| topic | watersheds sloping land erosion runoff weirs vegetation cassava |
| url | https://hdl.handle.net/10568/38606 |
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