Your search found 9 records
1 Phong, N. D.; Hoanh, Chu Thai; Tuong, T. P.; Malano, H. 2010. Managing acidity movement in the coastal land with acid sulphate soils: a modeling approach. In Proceedings of the 19th World Congress of Soil Science, Soil Solutions for a Changing World, Brisbane, Australia, 1-6 August 2010. Wageningen, Netherlands: International Union of Soil Sciences (IUSS) pp.76-79 (Published on DVD)
Acid sulphate soils ; Simulation models ; Acidity ; Control methods ; Salinity ; Canals ; Coastal area / Vietnam / Mekong Delta / Camau Peninsula
(Location: IWMI HQ Call no: e-copy only Record No: H043265)
(0.20 MB) (202.81 KB)
A new acidity module has been developed and coupled successfully into an existing hydraulic and salinity model for simulating acidity movement in canals under the controlled marine water intake in the coastal land with acid sulphate soil (ASS). The model allied with the Camau peninsula, Mekong Delta, Vietnam indicates that the most suitable option for improving the acidity condition is to open main sluice gates one day every week when difference of tide amplitude of between the East and West seas is highest and to widen the canals connected to the West sea.
2 Phong, N.; Tuong, T. P.; Hoanh, Chu Thai. 2013. Managing acidic pollution in a coastal area in Mekong River Delta, Vietnam: case study of Bac Lieu Province [Abstract only]. In German Aerospace Center (DLR); Germany. Federal Ministry of Education and Research (BMBF). Mekong Environmental Symposium, Ho Chi Minh City, Vietnam, 5-7 March 2013. Abstract volume, Topic 07 - Mekong Basin aquatic ecology, biodiversity and water quality protection. Wessling, Germany: German Aerospace Center (DLR); Bonn, Germany: Federal Ministry of Education and Research (BMBF). 1p.
Coastal area ; Water pollution ; Acidity ; Rivers ; Deltas ; Canals / Vietnam / Bac Lieu Province / Mekong River Delta
(Location: IWMI HQ Call no: e-copy only Record No: H045824)
http://www.mekong-environmental-symposium-2013.org/frontend/file.php?id=3020&dl=1
https://vlibrary.iwmi.org/pdf/H045824.pdf
https://vlibrary.iwmi.org/pdf/H045824.pdf
(0.08 MB) (2.09MB)
3 Phong, N. D.; Tuong, T. P.; Phu, N. D.; Nang, N. D.; Hoanh, Chu Thai. 2013. Quantifying source and dynamics of acidic pollution in a coastal acid sulphate soil area. Water, Air, and Soil Pollution, 224(11):18p. [doi: https://doi.org/10.1007/s11270-013-1765-0]
Environment ; Pollution ; Water management ; Water quality ; Flow discharge ; Acidity ; Acid sulphate soils ; Soil properties ; Statistical analysis ; Canals / Vietnam / Bac Lieu Province
(Location: IWMI HQ Call no: e-copy only Record No: H046206)
(0.96 MB)
The in-depth knowledge on management and reducing annual acidic pollution is important for improving the sustainable livelihood of people living in areas with acid sulphate soils (ASS). This study involved a long-term (2001–2006), large-scale canal water quality monitoring network (87 locations) and a field experiment at nine sites to quantify the dynamic variability of acidic pollution and its source in a coastal area with ASS in the Mekong River Delta of Vietnam. Widespread acidic pollution (pH <5) of surface water occurred at the beginning of the rainy season, while pH of the canal water remained high (7–8) at the end of the rainy season and during the dry season. The study identified canal embankment deposits, made of ASS spoils from canal dredging/excavation, as the main source of acidic pollution in the surrounding canal network. The findings suggested that there was a linkage between the amount of acidic loads into canal networks and the age of the embankment deposits. The most acute pollution (pH ~ 3) occurred in canals with sluggish tidal water flow, at 1–2 years after the deposition of excavated spoils onto the embankments in ASS. The amount of acidic loads transferred to the canal networks could be quantified from environmental parameters, including cumulative rainfall, soil type and age of embankment deposits. The study implied that dredging/excavation of canals in ASS areas must be carried out judiciously as these activities may increase the source of acidic pollution to the surrounding water bodies.
4 Phong, N. D.; Hoanh, Chu Thai; Tuong, T. P.; Malano, H. 2014. Effective management for acidic pollution in the canal network of the Mekong Delta of Vietnam: a modeling approach. Journal of Environmental Management, 140:14-25. [doi: https://doi.org/10.1016/j.jenvman.2013.11.049]
Acidity ; Water pollution ; Deltas ; Salinity ; Canals ; Water management ; Water quality ; Models ; Coastal area ; Tides ; Shrimp culture / Vietnam / Mekong Delta
(Location: IWMI HQ Call no: e-copy only Record No: H046405)
(4.06 MB)
Acidic pollution can cause severe environmental consequences annually in coastal areas overlain with acid sulfate soils (ASS). A water quality model was used as an analytical tool for exploring the effects of water management options and other interventions on acidic pollution and salinity in Bac Lieu, a coastal province of the Mekong Delta. Fifty eight percent of the provincial area is covered by ASS, and more than three-fourths (approximately 175,000 ha) are used for brackish-water shrimp culture. Simulations of acid water propagation in the canal network indicate that the combination of opening the two main sluices along the East Sea of the study area at high tide for one day every week in May and June and widening the canals that connect these sluices to the West Sea allows for adequate saline water intake and minimizes the acidic pollution in the study area. On the other hand, canal dredging in the freshwater ASS area should be done properly as it can create severe acidic pollution.
5 Phong, N. D.; Hoanh, Chu Thai; Tuong, T. P.; Wassmann, R. 2014. Sea level rise effects on acidic pollution in a coastal acid sulphate soil area. In Ames, D.P., Quinn, N.W.T., Rizzoli, A.E. (Eds.). Proceedings of the 7th International Congress on Environmental Modelling and Software, San Diego, California, USA, 15-19 June 2014. Manno, Switzerland: International Environmental Modelling and Software Society (iEMSs) 8p.
Sea level ; Salinity ; Acidity ; Water pollution ; Coastal area ; Acid sulphate soils ; Deltas ; Canals ; Models / Vietnam / Mekong River Delta / Bac Lieu Province
(Location: IWMI HQ Call no: e-copy only Record No: H046614)
http://www.iemss.org/sites/iemss2014/papers/iemss2014_submission_223.pdf
https://vlibrary.iwmi.org/pdf/H046614.pdf
https://vlibrary.iwmi.org/pdf/H046614.pdf
(0.39 MB) (397.30 KB)
Bac Lieu is a coastal province the Mekong River Delta (MRD), Vietnam. Aside from salinity intrusion from the sea, the province is strongly affected by acidic pollution as 58% of the area (250,000 ha) is overlaid with acid sulphate soil (ASS). Previous studies showed that the eminent sea level rise (SLR) would influence the hydrology and salinity of the canal networks in the province. This study, using the previously validated hydraulic and water quality model VRSAP-ACIDITY (Vietnam River Systems And Plains, coupled with ACIDITY Module), aimed at quantifying impacts of different SLR scenarios (SLR = 17, 30, 50, or 75 cm) on acidic pollution in the province. Under the present sea level, widespread acidic pollution (pH < 5) of surface water occurred at the start of the rainy season, due to leaching of acidity from canal embankments and fields in ASS. The acceleration of SLR reduced the area of acidic polluted water. The lessening in acidic pollution was attributed to (1) SLR that raised the water level in the Mekong River, increasing the amount of fresh water flowing into the study area; and (2) the amount of water drained out of the study area increased, bringing with its acidity. It concluded that SLR has a positive effect on acidic pollution in the ASS coastal area.
6 Mekuria, Wolde; Noble, Andrew; McCartney, Matthew; Hoanh, Chu Thai; Douangsavanh, Somphasith; Langan, Simon. 2015. Soil management for raising crop water productivity in rainfed production systems in Lao PDR. Archives of Agronomy and Soil Science, 62(1):53-68. [doi: https://doi.org/10.1080/03650340.2015.1037297]
Soil management ; Soil amendments ; Soil organic matter ; Clay soils ; Crop production ; Water productivity ; Rainfed farming ; Climate change ; Evapotranspiration ; Land degradation ; Maize ; Biofuels ; Acidity / Lao People's Democratic Republic
(Location: IWMI HQ Call no: e-copy only Record No: H046994)
(0.26 MB)
This study investigated the impacts of organic- and clay-based soil amendments, and their combinations on crop water productivity (CWP) using maize as a test crop. On-station field trials were established over two consecutive years at the Naphok and Veunkham sites in Laos. At each site, 10 treatments were applied in a randomized complete block design with three replications. The treatments were control, rice husk biochar (10 t ha-1), bentonite clay (10 t ha-1), compost (4 t ha-1), clay-manure compost (10 t ha-1), rice husk biochar compost (10 t ha-1), bentonite clay + biochar, bentoniteclay + compost, biochar + compost, and bentonite clay + biochar + compost. All treatments were applied in 2011. Significant (p < 0.05) treatment effects in CWP and growing period evapotranspiration were determined. At Naphok, differences between the amended and control plots in CWP varied between 0.1 and 0.6 kg m-3 in 2011 and from 0.1 to 0.4 kg m-3 in 2012, whereas differences at Veunkham varied between 0.3 and 1.0 kg m-3 in 2011 and from 0.05 to 0.29 kg m-3 in 2012. At both sites, CWP in 2012 was significantly lower than 2011. Our results illustrate that organic- and claybased soil amendments improve CWP, indicating that soil-based interventions could be suitable options for improving agricultural productivity.
7 Amarasiri, S. 2015. Caring for water. 2nd ed. Katugastota, Sri Lanka: National Water Supply and Drainage Board. Greater Kandy Water Supply Project. 166p.
Water resources ; Surface water ; Water use ; Water quality ; Drinking water ; Waterborne diseases ; Water pollution ; Water storage ; Acidity ; Alkalinity ; Saline water ; Eutrophication ; Plankton blooms ; Phosphorus ; Industrial uses ; Industrial pollutants / Sri Lanka
(Location: IWMI HQ Call no: 333.91 G744 AMA Record No: H047148)
(0.40 MB)
8 Soda, W.; Noble, Andrew D.; Suzuki, S.; Simmons, R.; Sindhusen, L.; Bhuthorndharaj, S. 2005. The co-composting of waste bentonites from the processing of vegetable oil and its affect on selected soil properties of a light textured sand. In International Union of Soil Sciences (IUSS); Institut de Recherche pour le Developpement (IRD); Thailand. Land Development Department (LDD); International Water Management Institute (IWMI); FAO. Regional Office for Asia and the Pacific (FAO RAP); Khon Kaen University. Faculty of Agriculture. Management of tropical sandy soils for sustainable agriculture: a holistic approach for sustainable development of problem soils in the tropics. Proceedings of the First Symposium on Management of Tropical Sandy Soils for Sustainable Ariculture, Khon Kaen, Thailand, 27 November – 2 December 2005. Bangkok, Thailand: FAO Regional Office for Asia and the Pacific (FAO RAP). pp.204-214.
Composting ; Bentonite ; Plant oils ; Waste treatment ; Bleaching ; Litter for animals ; Rice husks ; Soil properties ; Soil chemicophysical properties ; Acidity ; Porosity ; Pot experimentation / Thailand / Bangkok
(Location: IWMI HQ Call no: 630 G000 INT Record No: H047327)
(0.59 MB) (16.9 MB)
Waste acid bentonite is a byproduct from vegetable oil bleaching that is both acidic (pH <3.0) and water repellent (hydrophobic). These materials are currently disposed in landfills and are an environmental hazard due to the aforementioned properties. A study was undertaken using three different sources of waste oil bentonites collected from processing plants within the Bangkok metropolitan area. These wastes included soybean oil bentonite (SB), palm oil bentonite (PB) and rice bran oil bentonite (RB), each of which was co-composted with rice husk, rice husk ash, and chicken litter in order to eliminate their acid reactivity and hydrophobic nature. The chemical and physical characteristics of acid activated bentonites before and after bleaching and the co-composted materials after addition to a degraded light textured soil were assessed and are reported herein. The organic carbon (OC) content, pH, exchangeable cations and cation exchange capacity (CEC) of the waste oil bentonites increased significantly after the co-composting phase. In addition, the hydrophobic nature of these materials as measured using the Water Drop Penetration Test (WDPT) decreased from 10,800 seconds to 16-80 seconds after composting. Furthermore, when these composted materials were incorporated into a degraded light textured sandy soil positive impacts to soil physical attributes in terms of specific surface area, total porosity and available water content for crop growth were observed. The results from this study demonstrate the positive impact of the waste products when modified through composting on the physical and chemical properties of a light textured sandy soil.
9 Challenge Program for Water and Food (CPWF); FAO-Regional Office for Asia and the Pacific (FAO-RAP); International Water Management Institute (IWMI); International Rice Research Institute (IRRI); WorldFish Center; Burapha University. 2007. Managing the coastal land-water interface in tropical delta systems. Conference Program, Bang Sean, Thailand, 7-9 November 2007. Colombo, Sri Lanka: Challenge Program for Water and Food (CPWF); Rome, Italy: FAO-Regional Office for Asia and the Pacific (FAO-RAP); Colombo, Sri Lanka: International Water Management Institute (IWMI); Los Banos, Philippines: International Rice Research Institute (IRRI); Penang, Malaysia: WorldFish Center; Bangsaen, Thailand: Burapha University. 55p.
Coastal area ; Coastal waters ; Land management ; Land use ; Land degradation ; Water management ; Water governance ; Water quality ; Water use ; Delta ; River basins ; Salinity ; Living standards ; Environmental policy ; Environmental sustainability ; Environmental impact assessment ; Mangroves ; Incentives ; Wetlands ; Local communities ; Local government ; Natural resources management ; Oils industry ; Resource management ; Ecosystems ; Profitability ; Rice fields ; Shrimps ; Salt water intrusion ; Aquatic environment ; Spatial distribution ; Acidity ; Aquatic weeds ; Vermicomposting ; Sustainable development ; Risk assessment ; Case studies / India / Thailand / Nigeria / Bangladesh / Vietnam / Philippines / Indus River Delta / Krabi Province / Bac Lieu Province / Surat Thani Province / Bataan / Orissa / Dagupan City / Niger Delta
(Location: IWMI HQ Call no: IWMI Record No: H049068)
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