Your search found 3 records
1 Luu, T. N. M.; Orange, Didier; Dang T. H.; Le Lan Anh; Garnier, J. 2007. Impact des activites anthropiques sur les flux de matieres en suspension et sur la qualite des eaux du fleuve Rouge a l’entree du delta. In French. [Impact of human activities on material flows suspended and the water quality of the Red River at the entrance of the delta]. In Do, S. Q. Integrated management of water and soil: resources, facilities and risk in rural and urban - proceedings of the 1st Scientific Meeting of the Inter-Network AUF, Hanoi, Vietnam, 6-9 November 2007 - Theme 2: Towards a sustainable management of rural and urban water systems. Montreal, Canada: Agence Universitaire de la Francophonie (AUF); Marseille, France: Institut de Recherche pour le Developpement (IRD); Hanoi, Vietnam: National University of Hanoi (UNH); Hanoi, Vietnam: Academy of Agricultural Sciences of Vietnam (SSAC); Hanoi, Vietnam: National Institute for Soils and Fertilizers (NISF). 6p.
Rivers ; Water quality ; Wastewater ; Pollution control / Vietnam / Red River / Hanoi / Day River / Nhue River
(Location: IWMI HQ Call no: 333.9162 G784 LUU Record No: H040809)
http://www.infotheque.info/fichiers/JSIR-AUF-Hanoi07/articles/AJSIR_2-p9_Luu.pdf
https://vlibrary.iwmi.org/pdf/H040809.pdf
https://vlibrary.iwmi.org/pdf/H040809.pdf
(173KB)
The water quality of the Red River is studied near Hanoi in comparison with the water quality of two small rivers, Day and Nhue, going to the Sea of China. The suspended load in the Red River is strongly linked to the rainy season, even near Hanoi in spite of the large demography: the suspended load is weak during the dry season, high during the rainy season (rising from 19 to 115 mg/l in 2005/2006). However our measurements prove that the suspended load increases within the Red River inside the Delta: we assume that it is due to the erosion of the river bank. In comparison with the Red River, the waters of the small streams are less loaded in suspended matter, due to the use of dams. At the opposite, the conductivity of the small streams are equal or highest than the Red River water. The measurements (concentrations in ammonium and phosphate) prove that the Red river could be used to clean the waste waters to drain the surface waters of the Delta to the Chinese sea.
2 Dang, T. H.; Coynel, A.; Orange, Didier; Blanc, G.; Etcheber, H.; Schafer, J.; Le, L. A. 2009. Erosion and impact of human disturbance on sediment transport in the Red River, Vietnam. [Goldschmidt Conference Abstracts 2009]. Geochimica et Cosmochimica Acta, 73(13) Supplement 1:A260.
(Location: IWMI HQ Call no: e-copy only Record No: H042657)
http://www.goldschmidt2009.org/abstracts/finalPDFs/A260.pdf
https://vlibrary.iwmi.org/pdf/H042657.pdf
https://vlibrary.iwmi.org/pdf/H042657.pdf
(0.11 MB)
Mechanical erosion and sediment transfers depend strongly on many natural parameters related to topography, climate and land cover [1]. Additionally, anthropogenic activities may affect sediment supplies to estuaries, deltas and the coastal zone [2]. The Red River (China/Vietnam, A=155 000 km²) is a typical tropical humid river originating from the mountainous area of the Yunnan Province in China. Based on daily discharges (Q) and suspended particulate matter (SPM) concentrations between 1960-2007 at SonTay gauging station (outlet of the river and entry to the Delta) provided by the national institute IMHE-MONRE, the mean annual SPM fluxes was estimated to 90 Mt/yr, corresponding to a sediment yield of 600 t/km²/yr, similar to the Ganges/Brahmaputra system [3], and probably due to same controlling factors. The temporal variability of annual SPM fluxes (ranging from 24 to 200 Mt/yr) is strongly related to the interannual hydrological conditions. However, some years of high water flow did not account for high sediment fluxes, especially after 1989 when the HoaBinh dam was operated. Sediment rating curves (power law-type; SPM=aQb) were fitted for both periods (1960-1989; 1990-2007). The analysis of the pre- and post-1989 sediment rating parameters (a, b) suggests a downshift of a-parameter values after 1989, attributed to decreased sediment supply [4]. A single sediment rating curve derived from 1960-1989 data was used to simulate the annual variability of former sediment delivery, generating excellent cumulative flux estimates (error <-5%). In contrast, applying the same rating curve to the 1986-2007 data resulted in systematic, important (up to 97%) overestimation. This suggests that the HoaBinh dam reduces annual SPM delivery to the delta by half, implying changes in nutrient and contaminant transport.
3 Dang, T. H.; Coynel, A.; Orange, Didier; Blanc, G.; Etcheber, H.; Le, L. A. 2010. Long-term monitoring (1960–2008) of the river-sediment transport in the Red River Watershed (Vietnam): temporal variability and dam-reservoir impact. Science of the Total Environment, 408:4654-4664. [doi: https://doi.org/10.1016/j.scitotenv.2010.07.007]
Rivers ; Erosion ; Watersheds ; Sediment transport ; Monitoring ; Dams ; Reservoirs / South East Asia / Vietnam / Red River Watershed / HoaBinh Reservoir
(Location: IWMI HQ Call no: e-copy only Record No: H043301)
(1.43 MB)
The Red River (China/Vietnam, A=155,000 km²) is a typical humid tropics river originating from the mountainous area of Yunnan Province in China. Based on information on daily discharge (Q) and suspended particulate matter (SPM) concentration between 1960–2008 for the SonTay gauging station (outlet of the River and entry to the Delta) provided by the National Institute IMHE-MONRE, the mean annual SPM flux was estimated at 90 Mt/yr, corresponding to a sediment yield of 600 t/km²/yr. The temporal variability of annual SPM fluxes (ranging from 24 to 200 Mt/yr) is strongly related to the interannual hydrological conditions. However, some years of high water flow were not associated with high sediment fluxes, especially after 1989 when the HoaBinh dam came into operation. Therefore, the median discharge pre- (3389 m3/s) and post 1989 (3495 m3/s) are similar indicating there was little or no change between both periods. Sediment rating curves (power law-type; SPM=aQb) were fitted for both periods (1960–1989; 1990–2008). The analysis of the pre- and post-1989 sediment rating parameters (a, b) suggests a downshift of b-parameter values after 1989, attributed to a decrease of the sediment supply due to the commissioning of the HoaBinh dam. A single sediment rating curve derived from 1960–1989 data was used to simulate the annual variability of former sediment delivery, generating excellent cumulative flux estimates (error ~1%). In contrast, applying the same rating curve to the 1990–2008 data resulted in systematic and substantial (up to 109%) overestimation. This suggests that the HoaBinh dam reduces annual SPM delivery to the delta by half, implying important metal/metalloid storage behind the HoaBinh dam.
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