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The Tha Chin River is Overloaded with Nutrients
Schaffner, Monika
"Increasingly intensive farming practices have led to a dramatic deterioration of water quality in the Tha Chin River in Thailand. One major problem is the high level of nutrients. According to our model – based on material flow analysis – intensive aquaculture accounts for a large proportion of the nutrient inputs." Eawag News 62d: 18-20. Download
Material Flow Analysis in the Tha Chin River Basin, Thailand
Schaffner, Monika
The Material Flow Analysis (MFA) model provides an overview of the main nutrient flows in the Tha Chin River Basin, Central Thailand. Instead of extensive measuring campaigns, local data is integrated into the model to quantify these flows and find suitable remediation measures. Download (1 MB)
Modeling the contribution of point sources and non-point sources to Thachin River water pollution
Schaffner, Monika
Paper available at: http://www.sciencedirect.com/science/article/pii/S0048969709004628
Vulnérabilité et résilience des populations riveraines liées à la pollution des eaux lagunaires de la métropole d'Abidjan, Côte d'Ivoire
Koné, Brama
"La lagune d'Abidjan est polluée par les déchets urbains. Les populations périurbaines, riveraines de cette lagune sont exposées à la pollution. L'étude porte sur l'évaluation des aspects de vulnérabilité et de résilience des populations exposées. Neuf "focus groups" ou groupes de discussion ont été réalisés sur trois sites qui bordent la lagune. Les populations étudiées se disent victimes de "la ville". Les aspects de leur vulnérabilité rapportés par elles sont entre autres les mauvaises odeurs qui émanent des eaux lagunaires, les mouches et moustiques qui se multiplient en lagune et qui leur apportent des maladies comme le paludisme et les diarrhées, les démangeaisons de corps dont les pêcheurs se plaignent. En ce qui concerne les aspects de résilience, des actions individuelles d'entretien des berges lagunaires sont menées par endroit. Le capital financier, humain et social des malades ou de leur famille joue un rôle important dans leur résilience en cas de maladie." VertigO - la revue électronique en sciences de l'environnement 2006, hors série 3, Article 5 Download PDF from: VertigO
Alarm – zu viele Nährstoffe im Tha Chin Fluss
Schaffner, Monika
"Mit zunehmender landwirtschaftlicher Intensivierung hat sich die Wasserqualität des Tha Chin in Thailand massiv verschlechtert. Ein enormes Problem ist der hohe Nährstoffgehalt des Flusses. Unser Stoffflussmodell zeigt, dass ein Grossteil der Nährstoffe aus der intensiven Fischzucht stammt." Eawag News 62d December 2006, pp. 18-20. Download
Applying a Material Flow Analysis Model to Assess River Water Pollution and Mitigation Potentials
Schaffner, Monika
PhD Thesis, University of Bern, Switzerland [...] With the current research, a Mathematical Material Flow Analysis (MMFA) is applied as an alternative approach to conventional river water quality models. Applied to analyze river water polllution, the MMFA allows to trace the pollution flows and their transformations from their input to the system as resource, through waste production, separation, treatment and finally to their outputs as product or as discharge into receiving water bodies. In this way, the perspective is widened to grasp the river system in an overview and to understand the origins and the main processes involved in the chain of nutrient pollution generation. The key parameters influencing the pollution flows are determined, based on which concrete and effective mitigation measures can be devised and evaluated. [...]
Modelling the Water and Nutrient Flows of Freshwater Aquaculture in Thailand
Wittmer, Irene
Master's Thesis, Swiss Federal Institute of Technology Zurich, Switzerland "The Tha Chin River Basin (central Thailand) faces major water quality problems. Among others, freshwater aquaculture was identified to be one of the pollution sources. This study looks at nutrient loads coming from freshwater aquaculture systems in the area. A model based on a material flow analysis was set up to quantify the loads to canals and rivers as well as to identify the key factors (parameters) that influence the system. The focus was placed on four different major cultivation systems. For all four considered systems, the amount of feed and nutrient concentrations in feed have the highest influence on the nutrient loads to the canal. [...]" Download
Modeling non-point source pollution from rice farming in the Thachin River Basin
Schaffner, Monika
With the worldwide intensification of agriculture, non-point source pollution of surface waters has become a pressing issue. Conventional river water quality models consider non-point sources as accumulated entries into the rivers and do not investigate into the processes generating the pollution at its source, thus preventing the determination of effective mitigation measures. The models require extensive data inputs, which is a deficiency in many developing and emerging countries with limited data availability. The current study applies a Material Flow Model as a complementary approach to quantify non-point source pollution from agricultural areas. Rice farming in the Thachin River Basin is presented as a case study, with a focus on nutrients. The total nitrogen and phosphorus flows from rice farming to the river system are quantified, the key parameters influencing these flows are determined and potential mitigation measures are discussed. The results show that rice contributes considerable nutrient loads to the Thachin River Basin. Scenario simulations demonstrate that a significant nutrient load reduction could be achieved by following the official recommendations for fertilizer application, thus confirming the local efforts to introduce best management practice. Our results underline the importance of non-point source pollution control in intensive agricultural areas, particularly of tropical lowland delta areas such as the Central Plains of Thailand. The specific benefit of applying a Material Flow Model in this context is that with limited data availability, one can reach an understanding of the system and gain a first overview over its key pollution problems. This can serve as supportive basis for determining consecutive in-depth research requirements. Paper available at: http://www.springerlink.com/content/2630616v30q61506/?MUD=MP
Using a Material Flow Analysis Model to Assess River Water Quality Problems and Mitigation Potentials
Schaffner, Monika
"The Material Flow Analysis carried out for Tha Chin River Basin is illustrated by an in-depth study on nutrient contributions from aquaculture." Download
Modeling the contribution of pig farming to pollution of the Thachin River
Schaffner, Monika
Rapid growth of the livestock production sector in South-East Asia during recent decades has led to a widespread degradation of ground and surface waters. The Thachin River Basin in Central Thailand serves as a case study for investigating the origins and pathways of nutrient loads produced by intensive pig farming. A mathematical material flow analysis is used to identify key nitrogen flows and the main parameters determining them. Scenarios of the potential for reducing these flows and achieving compliance with current discharge regulations are investigated. The results show that liquid waste discharged from large pig farms and directly discharged waste from small farms are the key nitrogen flows to the river system. The key driving forces are not only the treatment coverage and efficiencies but also the rate of reuse and recycling of the treated product. Paper available at: http://www.springerlink.com/content/l72t1878k2075942 Year of Publication: 2009