Records 1 - 20 / 307
Help feed the world population with the use of drainage | WURcast
Ritzema, H.P. - \ 2019
Wageningen : Wageningen University & Research
agriculture - drainage - food production - irrigation - salts - water
More food, lower footprint : How circular food production contributes to efficiency in the food system
Scholten, M.C.T. - \ 2017
Wageningen : Wageningen University & Research
biobased economy - biobased chemistry - cycling - environment - sustainability - nutrition - biomass - renewable energy - residual streams - agricultural wastes - organic wastes - crop residues - food production - biobased economy - chemie op basis van biologische grondstoffen - kringlopen - milieu - duurzaamheid (sustainability) - voeding - biomassa - hernieuwbare energie - reststromen - agrarische afvalstoffen - organisch afval - oogstresten - voedselproductie
Martin Scholten on circular food production. Ideas about how circular food production can contribute to the sustainable food security.
'Meer reststromen benutten in veevoer'
Gerrits, W.J.J. - \ 2017
residual streams - animal nutrition - sustainability - food - food production - livestock farming
Modelling the dynamic interactions between food production and ecosystem services : a case study in Benin
Duku, C. - \ 2017
Wageningen University. Promotor(en): L.G. Hein, co-promotor(en): S.J. Zwart. - Wageningen : Wageningen University - ISBN 9789463431613 - 141
ecosystem services - modeling - food production - case studies - hydrology - irrigation - forests - woodlands - climatic change - nature conservation - food security - benin - ecosysteemdiensten - modelleren - voedselproductie - gevalsanalyse - hydrologie - irrigatie - bossen - bosgebieden - klimaatverandering - natuurbescherming - voedselzekerheid - benin
Given the high levels of food insecurity and the loss of vital ecosystem services associated with deforestation, countries in sub-Saharan Africa (SSA) face a major dilemma. How can they produce enough food in a changing climate to feed an increasing population while protecting natural forests and woodlands that provide a wide array of ecosystem services beneficial to livelihoods? Thus, the objectives of this thesis are twofold. First, to further enhance the understanding of the dynamic interactions between food production, and natural and semi-natural ecosystems with a case study in Benin. Second, to further enhance the understanding of how hydrological ecosystem services can be captured in an accounting framework. Understanding hydrological ecosystem services is key to understanding the multi-directional relationship between food production and ecosystem services supply from natural and semi-natural ecosystems. First, I examine how a spatially explicit ecohydrological model can be used to analyse multiple hydrological ecosystem services in line with the ecosystem accounting framework. The hydrological ecosystem services include crop water supply for rainfed agriculture, household water supply (both groundwater supply and surface water supply), water purification, and soil erosion control. Second, I develop a general modelling approach for analysing the effects of deforestation on the availability of water for irrigation at the watershed level, and I apply the approach to the Upper Oueme watershed in Benin. Third, I analyse the impact of climate change on agricultural intensification options. Finally, I quantify trade-offs between per capita food availability and protecting forests and woodlands at different levels of yield increases taking into account climate change, population growth. This thesis shows that the integration of hydrological ecosystem services into an accounting framework can provide relevant information at appropriate scales suitable for decision-making. It is empirically feasible to distinguish between service capacity and service flow of hydrological ecosystem services. This requires appropriate decisions regarding physical and mathematical representation of ecohydrological processes, spatial heterogeneity of ecosystems, temporal resolution, and required model accuracy. This thesis also shows that opportunities for irrigation expansion depend on conservation of forests and woodlands in the headwaters of the rivers feeding the irrigation scheme. Opportunities for agricultural intensification in SSA are likely to diminish with climate change, hence increasing pressure to expand cultivated areas in order to meet increasing food demand. Climate change will lead to substantial reductions in; exploitable yield gaps for major food crops, rainfed cropland areas that can support the cultivation of two or more crops per year, and water availability for irrigation expansion. Furthermore, in the far future crop yields will have to increase at a faster rate than has been recorded over the past two and half decades in order to maintain current levels of per capita food availability. Failure to achieve the required levels of yield increases is likely to lead to the conversion of substantial areas of forests and woodlands for crop cultivation. Based on the results of this thesis, four main recommendations to help address the dual challenge of food security and ecosystem protection in Benin and the larger SSA region are made: (i) promote a precautionary approach to forest and woodland conservation, (ii) promote cross-sectoral policy coherence and consultations, (iii) promote the development of satellite ecosystem accounts consistent with national accounts, and (iv) identify, evaluate and implement adaptation and resilience measures to reduce agricultural vulnerability to climate change.
Zoeken naar betekenis in twee waarheden : samenhang tussen bodem- en voedselkwaliteit tijdens symposium niet opgehelderd
Gils, S.H. van - \ 2017
Ekoland (2017)4. - ISSN 0926-9142 - p. 32 - 33.
bodembeheer - bodemkwaliteit - voedselkwaliteit - voeding en gezondheid - voedselproductie - biologische landbouw - melkveehouderij - bemesting - soil management - soil quality - food quality - nutrition and health - food production - organic farming - dairy farming - fertilizer application
In de landbouw bestaan er twee waarheden: die van de wetenschap en die van de praktijk. Tijdens het symposium Sustainable soil management & healthy food bleken die twee waarheden vooralsnog onverenigbaar. “Niet om te beledigen, maar de praktijk loopt toch een beetje voor op de wetenschap”, vindt melkveehouder Kees van Gaalen.
Safeguarding water availability for food and ecosystems under global change : modelling and assessment of the role of environmental flows
Pastor, Amandine V. - \ 2017
Wageningen University. Promotor(en): P. Kabat, co-promotor(en): F. Ludwig; H. Biemans. - Wageningen : Wageningen University - ISBN 9789463431767 - 177
water availability - water management - flow - water deficit - food security - food production - global warming - aquatic ecosystems - waterbeschikbaarheid - waterbeheer - stroming - watertekort - voedselzekerheid - voedselproductie - opwarming van de aarde - aquatische ecosystemen
In a context of future population increase and intensification of water cycle by climate change, water demand for irrigation is projected to double. However, freshwater resources have been degraded the last decades especially in rivers via fragmentation, dam contraction and pollution. Flow alteration and degradation lead to 80% of freshwater ecosystem species loss. In this thesis, a robust and reliable Environmental Flow (EF) method was developed for global scale: the Variable Monthly Flow (VMF) method. This method allowed estimating EF deficit at global scale including its origin, timing, frequency and magnitude. By setting EFRs as priority user in a global vegetation and hydrological model (LPJmL), irrigation loss due to EFRs implementation were assessed at 30% leading to 5% global calorie loss. To maintain water allocation to humans and ecosystems under global change, food imports would require to increase by 15% especially from Latin America to South of Asia.
Multi-objective optimization for eco-efficient food supply chains
Banasik, Aleksander - \ 2017
Wageningen University. Promotor(en): Jacqueline Bloemhof-Ruwaard; Jack van der Vorst, co-promotor(en): Frits Claassen. - Wageningen : Wageningen University - ISBN 9789463430944 - 147
food chains - supply chain management - food production - mushrooms - decision support systems - production planning - models - voedselketens - ketenmanagement - voedselproductie - paddestoelen - beslissingsondersteunende systemen - productieplanning - modellen
Until recently, food production focused mainly on delivering high-quality products at low cost and little attention was paid to environmental impact and depletion of natural resources. As a result of the growing awareness of climate change, shrinking resources, and increasing world population, this trend is changing. A major concern in Food Supply Chains (FSCs) is food waste. To remain competitive, FSCs are challenged to adopt new technologies that reduce or valorize food waste. These technologies can contribute to maintaining or increasing economic output and concurrently reduce the environmental impact of current operations, i.e. achieving what has been defined as eco-efficiency. Designing eco-efficient supply chains requires complex decision support models that can deal with multiple dimensions of sustainability while taking into account the specific characteristics of products and their supply chain. Multi-Criteria Decision Making (MCDM), a research field within Operations Research, is particularly suitable to support decision making when multiple and (mostly) conflicting criteria are involved. In this research, multi-objective optimization was used to quantify trade-offs between conflicting objectives and derive eco-efficient solutions, i.e. solutions in which environmental performance can only be improved at higher cost. The overall objective of this thesis was to support decision making in FSCs by developing dedicated decision support models to optimize and re-design FSCs by balancing the economic and environmental criteria. The emphasis is directed towards valorization of product flows by means of closing loops and waste management at a chain level. In line with this overall objective, four research questions were defined, which are addressed in Chapters 2 to 5.
In Chapter 2, the use of MCDM approaches for designing Green Supply Chains (GSCs) is reviewed; GSCs extend traditional supply chains to include activities that minimize the environmental impact of a product throughout its life cycle. A conceptual framework was developed to find relevant publications and categorize papers with respect to decision problems, indicators, and MCDM approaches. The analysis shows that the use of MCDM approaches for designing GSCs is a new but emerging research field. Most publications focus on production and distribution problems, and there are only a few inventory models with environmental considerations. Most papers assume all data to be deterministic. Moreover, little attention has been given to minimization of waste in studies on FSCs, and numerous indicators are used to account for eco-efficiency, indicating the lack of standards. Chapter 2, therefore, identifies the need for more multi-criteria models for real-life GSCs, especially with respect to supply chains dealing with food production, and with inclusion of uncertainty in parameters.
Environmental concerns and scarcity of resources encourage decision makers in supply chains to consider alternative production options that include preventing the production of waste streams and simultaneously reusing and recycling waste materials. Until now, quantitative modelling approaches on closing loops in FSCs have been rare in the literature. The aim of Chapter 3 was to develop a mathematical model that can be used for quantitative assessment of alternative production options associated with different ways of dealing with waste in FSCs, i.e. prevention, recycling, and disposal of food waste. A multi-objective mixed integer linear programming model was developed to derive a set of eco-efficient solutions corresponding to production planning decisions. The environmental performance of the chain is expressed by an indicator based on exergy analysis, which has the potential to capture other commonly used indicators, such as energy consumption, fuel consumption, and waste generation, in a single value. This simplifies the calculation of the eco-efficient frontier and enables its intuitive graphical representation, which is much easier to communicate to the decision makers. The applicability of the model is demonstrated on a real-life industrial bread supply chain in the Netherlands. The results confirm the findings from the literature that prevention is the best waste management strategy from an environmental perspective. The advantages of using exergy as an indicator to capture the environmental performance is demonstrated by comparing the outcomes with other commonly used indicators of environmental performance. The potential of studying food production planning decision problems in a multi-objective context is illustrated and the applicability of the model in the assessment of alternative production options is demonstrated.
In contrast to closed-loop studies in industry involving discrete parts, in FSCs the value of the final product usually cannot be regained. However, the components used for production, such as organic matter or a growing medium, can be recycled. The aim of Chapter 4 was to reveal the consequences of closing loops in a mushroom supply chain. A multi-objective mixed integer linear programming model was proposed to quantify trade-offs between economic and environmental indicators and to explore alternative recycling technologies quantitatively. The model was developed to re-design the logistical structure and close loops in the mushroom supply chain. It was found that adopting closing loop technologies in industrial mushroom production has the potential to increase the total profitability of the chain by almost 11% and improve the environmental performance by almost 28%. It is concluded that a comprehensive evaluation of recycling technologies and re-designing logistical structures requires quantitative tools that simultaneously optimize managerial decisions at strategic and tactical levels.
Multi-objective optimization models are often developed under the assumption that all information required for model parameterization is known in advance. In practice, however, not all the required information is available in advance because of various sources of uncertainty in FSCs. In Chapter 5, a multi-objective two-stage stochastic programming model was proposed to analyse and evaluate the economic and environmental impacts to account for uncertainty in FSCs. A mushroom supply chain in the Netherlands is presented as an illustrative case study. Optimal production planning decisions calculated with a two-stage stochastic programming model are compared with the results of an equivalent deterministic model. It is demonstrated that taking uncertainty into account at the production planning phase in an FSC can bring substantial economic and environmental benefits.
The research presented in this thesis contributes to the scientific literature on eco-efficient FSCs by providing decision support models for use by decision makers to assess alternative logistical structures and quantify the economic and environmental implications of closing loop technologies. This thesis shows that technological innovations, which allow for reuse and recycling of waste streams, have the potential to improve the economic and environmental performance of an FSC substantially. The case studies illustrate that it is worthwhile investing in research on technological innovations (and their development) for closing loops in FSCs. The greatest benefits are brought about by using materials to their full potential by valorizing waste streams as much as possible.
Towards an inclusive and sustainable economy
Meijl, Hans van; Ruben, Ruerd ; Reinhard, Stijn - \ 2017
Wageningen : Wageningen University & Research - 44
food security - food supply - food production - sustainable agriculture - sustainable development - biobased economy - agro-industrial chains - economic development - voedselzekerheid - voedselvoorziening - voedselproductie - duurzame landbouw - duurzame ontwikkeling - biobased economy - agro-industriële ketens - economische ontwikkeling
One of the major challenges facing global society today is the provision of food, water, energy, healthcare and other resources & services in a world characterised by increasing population, mounting environmental stresses and rising inequality. There is a need for circular and resilient food systems which close material flow loops in the entire supply chain from farm ers to consumers and back. This should be done in a resource-efficient manner that includes all relevant actors. This position paper summarises insights by Hans van Meijl, Stijn Reinhard and Ruerd Ruben from Wageningen Economic Research into what has been dubbed the inclusive and sustainable economy. Therefore, five overarching challenges, five scoping issues, and five beneficial economic principles are discussed. In addition, the authors formulate five key insights regarding feasible policy strategies and attempt to contribute to the analysis of leverage points relevant to upscaling and to anchoring market innovations that sustain sustainable and inclusive agri-food systems.
Gangbaar versus eco
Zanten, H.H.E. van; Giller, K.E. ; Bianchi, F.J.J.A. ; Boer, I.J.M. de - \ 2016
intensive farming - organic farming - animal production - food production - agroecology
Er gaapt een diepe kloof tussen aanhangers van gangbare, intensieve landbouw en aanhangers van ecologische landbouw. Theoretisch is die te overbruggen, maar het ‘ecologische’ kamp heeft politieke redenen om juist afstand te bewaren.
Windmolens veilig combineren met zeewierteelt : onderzoeksproject meervoudig gebruik van de zee
Castel, Fanny ; Stuiver, Marian - \ 2016
windmills - food production - seaweed culture - research projects - sustainable energy - biomass production - biobased economy
Hoe valt de productie van voedsel en energie op zee veilig te integreren, wilde Lloyd’s Register Foundation, een Engelse stichting, graag weten. Universiteitsfonds Wageningen zorgde voor de totstandkoming van een onderzoeksproject.
How to achieve resource use efficiency in integrated food and biobased value chains : Vision paper
Annevelink, E. ; Gogh, J.B. van; Bartels, Paul ; Broeze, J. ; Dam, J.E.G. van; Groot, Jim ; Koenderink, N.J.J.P. ; Oever, M.J.A. van den; Snels, J.C.M.A. ; Top, J.L. ; Willems, D.J.M. - \ 2016
Wageningen : Wageningen UR - Food & Biobased Research - 24
biobased economy - resource utilization - value chain analysis - bioenergy - biomass - recycling - sustainable development - economic development - food production - biobased economy - hulpbronnengebruik - waardeketenanalyse - bio-energie - biomassa - recycling - duurzame ontwikkeling - economische ontwikkeling - voedselproductie
This publication contains a vision, formulated by research experts in food and biobased production, on how to achieve increased efficient and effective use of available resources during the production and (re)processing of biomass for food and biobased products, feed and energy. This paper briefly elaborates on the transition to a sustainable bio-economy (see graph 1), focusing on the needs and requirements from a value chain perspective.
The citizen goes shopping : a framework for the assessment and optimization of production from the perspective of society
Michalopoulos, Tassos - \ 2016
Wageningen University. Promotor(en): Alfons Oude Lansink; Michiel Korthals, co-promotor(en): Henk Hogeveen. - Wageningen : Wageningen University - ISBN 9789462579828 - 207
food production - food ethics - labelling - consumer behaviour - consumer preferences - optimization - consumer information - philosophy - political attitudes - animal production - animal ethics - cattle - dairy cattle - voedselproductie - voedselethiek - etiketteren - consumentengedrag - consumentenvoorkeuren - optimalisatie - consumenteninformatie - filosofie - politieke houding - dierlijke productie - dierethiek - rundvee - melkvee
Nowadays, product labels are often used to enable consumers choose products that are friendly to the environment and to animals, natural, healthful and socially responsible. However, certain features of commonly used labels limit their usefulness. This thesis identifies a number of these limitations and presents an innovative labeling approach designed to address them.
More specifically, the following features limit the usefulness of the commonly used “endorsement” labels: they (1) offer a single certification grade, the requirements for which (2) are ‘static’ in the sense that certification standards do not depend on the evolution of the market, (3) are voluntary, and (4) are defined by stakeholders. Consequently, common labels fail to remove information asymmetry regarding the ethical performance of non-certified products; limit the opportunities for moderately –yet positively– concerned consumers to reveal ethical preferences; fail to motivate product improvement beyond certification standard; allow the emergence of a confusing variety of overlapping labels; and allow production stakeholders to resist socially desirable certification requirements when these are unfavorable to their business. In shoft, ethical labels currently fail to unleash on ethical aspects of production the inherently ‘free-market’ dynamics according to which products and firms must continuously innovate and improve, or else become obsolete and vanish.
As an alternative, this thesis proposes and works out an innovative “comparative” labeling approach that is designed to address these limitations. The proposed type of label is (1) multi-grade or continuous, (2) dynamic, (3) mandatory, and (4) society-defined. An example of this type of label is given at Figure 1.
Figure 1: Two variations of an example intuitive color-coded label format. The variations depict different sets of product attributes, and also different aggregation levels of the Environmental Impact attribute.
This type of labeling could motivate the creation of a ‘vitruous cyrcle’ or ‘race to the top’, in which the ethical performance of products moves to the direction that society at large regards as ‘positive’. This process is outlined at Figure 2.
Figure 2: Expected effects on the environmental performance of marketed product substitutes from the introduction of the proposed labeling system, in three phases. In Phase 1, the label is introduced on product substitutes available in the market (supply). In Phase 2, the supply evolves. To the standard (negative) incentives for cost minimization, are now added (positive) incentives to avoid negative reputation and to improve further the environmental frontiers of production through innovation. In Phase 3, the label is adjusted (updated) to the evolved supply. Products that failed to improve since last update might become downgraded (blue arrows).
It is argued that the proposed labeling approach has the potential to boost ethical consumerism as a force for the ethical optimization of the market. This can be directly relevant to issues about which society is concerned, and democratically elected goverments have limited ability to regulate. Among possible uses of the method developed to assess the relative performance of substitute products, are the comparative ranking of presently available labels (so as to inform consumers on the relative impact of different certified products), the justification of the allocation of incentives and discincentives in state policy, and also the ethical optimization and promotion of own production by socially responsible suppliers. Overall, the described approach aspires to transform markets into instruments that work to the direction willed by society, so as to bring market-driven and continuous improvement for production aspects of societal concern, such as environmental and socioeconomic aspects of the real economy.
Een circulair voedselsysteem is méér dan sluiten van kringlopen
Dagevos, H. - \ 2016
Voeding blog Wageningen University & Research
beleid inzake voedsel - economische ontwikkeling - voedselproductie - kringlopen - hulpbronnenbeheer - duurzame ontwikkeling - agro-industriële ketens - food policy - economic development - food production - cycling - resource management - sustainable development - agro-industrial chains
Een circulaire economie draait, kortweg, om het sluiten van kringlopen, en kent vooral milieutechnologische en logistieke benaderingen als kennispijlers. Maar een circulaire economie heeft evenzeer een sociaaleconomische invulling nodig. Hoe populair het tegenwoordig ook is in de beleids- en onderzoekswereld om voorstander te zijn van de circulaire economie, de vorming ervan vereist een fundamentele omslag. Attentie mag er daarom zijn om de animo waarmee vandaag de dag de noodzaak van een circulair voedselsysteem wordt bepleit te verbinden aan de animo waarmee werk wordt gemaakt van de condities waaronder deze transitie kan gedijen.
Exergy analysis in industrial food processing
Zisopoulos, F.K. - \ 2016
Wageningen University. Promotor(en): Remko Boom, co-promotor(en): Atze Jan van der Goot. - Wageningen : Wageningen University - ISBN 9789462578326 - 229
thermodynamics - energy - physical properties - food production - drying - food industry - efficiency - thermodynamica - energie - fysische eigenschappen - voedselproductie - drogen - voedselindustrie - efficiëntie
The sustainable provision of food on a global scale in the near future is a very serious challenge. This thesis focuses on the assessment and design of sustainable industrial food production chains and processes by using the concept of exergy which is an objective metric based on the first and second law of thermodynamics. Three case studies are presented, two on a chain level (industrial bread and mushroom production), and one on a process level (conceptual spray drying of a lactose solution). Furthermore, industrial food production chains are categorized as thermodynamic archetypes and general rules are derived for their sustainable design exergy-wise. Additional methodological aspects related to e.g. the impact of system boundaries, the allocation of exergy values to waste streams, and the influence of the selection of the environment of reference on the outcome of the analysis, are also discussed.
Co-creation in the practice, science and movement of agroecology
Milgroom, J. ; Bruil, Janneke ; Leeuwis, C. - \ 2016
Farming Matters 32 (2016)1. - ISSN 2210-6499 - p. 6 - 9.
agroecosystems - sustainability - family farms - farmers' knowledge - knowledge transfer - agricultural production systems - food production - lifelong learning - agro-ecosystemen - duurzaamheid (sustainability) - familiebedrijven, landbouw - kennis van boeren - kennisoverdracht - agrarische productiesystemen - voedselproductie - levenslang leren
Knowledge building is central to agroecology rooted in family farming. But why?
What type of knowledge, and whose knowledge is mobilised? This issue of
Farming Matters explores what we really mean by co-creation of knowledge in
agroecology, why it is so essential for today’s challenges, and how it takes place
around the world.
Bedrijfseconomisch perspectief de maat genomen
Burg, S.W.K. van den; Rood, G.A. ; Lienen, Frederiek van; Veldhuis-van Essen, C. - \ 2016
Tijdschrift Milieu : Vereniging van milieuprofessionals 22 (2016)3. - p. 30 - 32.
agro-ecosystemen - zeewierenteelt - voedselproductie - biomassa productie - ecosysteemdiensten - financieren - bedrijfseconomie - agroecosystems - seaweed culture - food production - biomass production - ecosystem services - financing - business economics
Het concept natuurlijk kapitaal maakt de maatschappelijke waarde van de goederen en diensten waarin de natuur voorziet zichtbaar. Maar is dit concept ook bruikbaar bij de ontwikkeling van sluitende verdienmodellen? Bij een bedrijfseconomische toepassing staan drie aandachtspunten centraal: de kosten van het gebruik van natuurlijk kapitaal in vergelijking tot concurrerende aanpakken, de mogelijkheid om de waarde van ecosysteemdiensten daadwerkelijk te verzilveren, en de bereidheid van afnemers en consumenten om te betalen voor de verbetering van ecosysteemdiensten.
An uncertain climate : the value of uncertainty and sensitivity analysis in environmental impact assessment of food
Groen, E.A. - \ 2016
Wageningen University. Promotor(en): Imke de Boer, co-promotor(en): Eddy Bokkers; R. Heijungs. - Wageningen : Wageningen University - ISBN 9789462577558 - 239
environment - environmental impact - climatic change - uncertainty analysis - screening - sensitivity analysis - modeling - greenhouse gases - farms - dairy farms - food production - correlation analysis - milieu - milieueffect - klimaatverandering - onzekerheidsanalyse - screenen - gevoeligheidsanalyse - modelleren - broeikasgassen - landbouwbedrijven - melkveebedrijven - voedselproductie - correlatieanalyse
Production of food contributes to climate change and other forms of environmental impact. Input data used in environmental impact assessment models, such as life cycle assessment (LCA) and nutrient balance (NB) analysis, may vary due to seasonal changes, geographical conditions or socio-economic factors (i.e. natural variability). Moreover, input data may be uncertain, due to measurement errors and observational errors that exist around modelling of emissions and technical parameters (i.e. epistemic uncertainty). Although agricultural activities required for food production are prone to natural variability and epistemic uncertainty, very few case studies in LCA and NB analysis made a thorough examination of the effects of variability and uncertainty. This thesis aimed to enhance understanding the effects of variability and uncertainty on the results, by means of uncertainty and sensitivity analysis. Uncertainty analysis refers to the estimation of the uncertainty attribute of a model output using the uncertainty attributes of the model in- puts. There are three types of sensitivity analyses: (I) a local sensitivity analysis addresses what happens to the output when input parameters are changed, i.e. the intrinsic model behaviour of a parameter; (II) a screening analysis addresses what happens to the output based on the un- certainty range of the different input parameters; and (III) a global sensitivity analysis addresses how much the uncertainty around each input parameter contributes to the output variance. Both the screening analysis and the global sensitivity analysis combine the intrinsic model behaviour with the information of uncertainty around input parameters. Applying uncertainty analysis and sensitivity analysis can help to reduce the efforts for data collection, support the development of mitigation strategies and improve overall reliability, leading to more informed decision making in environmental impact assessment models. Including uncertainty in environmental impact assessment models showed that: (1) the type of uncertainty analysis or sensitivity analysis applied depends on the question to be addressed and the available information; (2) in some cases it is no longer possible to benchmark environmental performance if epistemic uncertainty is included; (3) including correlations between input parameters during uncertainty propagation will either increase or decrease output variance, which can be predicted beforehand; (4) under specific characteristics of the input parameters, ignoring correlation has a minimal effect on the model outcome. Systematically combining a local and global sensitivity analysis in environmental impact assessment models: (1) resulted in more parameters than found previously in similar studies (for the case studies discussed in this thesis); (2) allowed finding mitigation options, either based on innovations (derived from the local sensitivity analysis) or on management strategies (derived from the global sensitivity analysis); (3) showed for which parameters reliability should be improved by increasing data quality; (4) showed that reducing the (epistemic) uncertainty of the most important parameters can affect the comparison of the environmental performance.
Resultaten melk- en grasmonitoring en kwaliteitscontroles 2015 : Landelijk Meetnet Radioactiviteit in Voedsel
Onstenk, C.G.M. ; Vos van Avezathe, A. ; Gerssen, A. - \ 2016
Wageningen : RIKILT Wageningen UR (RIKILT-rapport 2016.001) - 27
voedselproductie - radioactiviteit - monitoring - meetnetten - kwaliteitscontroles - melkcontrole - graslanden - food production - radioactivity - monitoring - monitoring networks - quality controls - milk recording - grasslands
Het Landelijk Meetnet Radioactiviteit in Voedsel (LMRV) dient als bewaking voor de voedselproductie en wordt ingezet in het nationale monitoringsprogramma, met name voor de monitoring van radioactiviteit in melk. In dit jaarrapport worden de resultaten van de melk- en grasmonitoring, en van de kwaliteitscontroles van de voedselmonitoren in 2015 gepresenteerd. In geen van de onderzochte melk- en grasmonsters zijn kunstmatige radionucliden gevonden, alleen natuurlijke radionucliden. Uit de kwaliteitscontrolemetingen van de weipoederbatches en het I-131 rondzendonderzoek blijkt dat de spreiding in resultaten tussen de verschillende voedselmonitoren onderling gering is. Behoudens twee K-40-resultaten voldeden alle meetresultaten aan de gehanteerde marge voor een terugvinding van tussen de 80% en 120%. Voor Cs-137 en I-131 komen de resultaten van de voedselmonitoren en het resultaat van de geaccrediteerde methode op de hoge-resolutie gammaspectrometer overeen. De weipoedermetingen laten voor het natuurlijke radionuclide K-40 echter wel een systematische overschatting zien ten opzichte van de gehanteerde referentiewaarden, welke voor een belangrijk deel toe te schrijven is aan de toegekende, te lage, referentiewaarden.
Meer voedsel, minder broeikasgas : landbouw en voedselproductie na Parijs
Verhagen, Jan ; Vellinga, Pier - \ 2016
climatic change - climate adaptation - agriculture and environment - greenhouse gases - agricultural production - groundwater depletion - heat - salinization - emission reduction - food production - food security
De klimaatconferentie in Parijs markeert het retour van de fossiele brandstoffen, vindt scheidend hoogleraar Pier Vellinga. Hij hoopt dat nu ook de uitstoot van broeikasgassen uit de landbouw omlaag gaat. Wageningse wetenschappers zijn daar al mee bezig, maar ook proberen ze de gevolgen van klimaatverandering het hoofd te bieden. Hoe valt er voldoende te produceren bij verdroging, hitte en verzilting?
Smit, A.B. ; Janssens, S.R.M. - \ 2016
LEI Wageningen UR (Factsheet / LEI Wageningen UR 2016-013b) - 12
suikerbieten - suikerfabrieksafval - agro-industriële bijproducten - reststromen - agro-industriële ketens - afvalhergebruik - voedselindustrie - voedselproductie - biobased economy - sugarbeet - sugar factory waste - agroindustrial byproducts - residual streams - agro-industrial chains - waste utilization - food industry - food production - biobased economy
De teelt en verwerking van suikerbieten leidt tot producten en diverse reststromen of bijproducten. In deze notitie worden de bestaande bijproducten en reststromen en hun huidige bestemmingen in kaart gebracht. Nagegaan is in hoeverre het geheel (het huidige gebruik) duurzaam is en of er mogelijkheden zijn om het economisch rendement te verbeteren.