Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

    Records 1 - 20 / 104

    • help
    • print

      Print search results

    • export

      Export search results

    • alert
      We will mail you new results for this query: q=Rietveld
    Check title to add to marked list
    Bridging youth and gender studies to analyse rural young women and men's livelihood pathways in Central Uganda
    Rietveld (Anne), A.M. ; Burg, M. van der; Groot, J.C.J. - \ 2020
    Journal of Rural Studies 75 (2020). - ISSN 0743-0167 - p. 152 - 163.
    Agriculture - Gender norms - Intersectionality - Migration - Opportunity space - Rural economy - Young people

    Many development countries are currently undergoing major demographic shifts as the percentage of young people of the total population rapidly increases. This shift is associated with high rates of migration, unemployment and instability. In policy discourses, engaging youth in commercial agricultural is often presented as a measure to control or even counter these trends. In Uganda, a country with one of the youngest populations in the world, we investigated whether young people themselves see a career in farming as an option. We studied the livelihood pathways of rural-born young men and women from Central Uganda and in particular; 1) their aspirations, 2) the extent to which these aspirations are associated with agriculture, and 3) the importance of gender in shaping their opportunity spaces. Data consisted of in-depth interviews with 8 young men and 8 young women originating from the same rural community in Central Uganda (2017) and was supported by three additional datasets collected between 2010 and 2014; one qualitative case-study conducted in the same site (2014) and two survey datasets collected in three rural sites in Central Uganda in 2010 (N = 199) and 2012 (N = 54). Our findings suggest a large proportion of youth out-migrating from the rural communities, with young women migrating more often than young men. Farming was seldom an aspiration but irrespective of sex or residence most young men and women did remain engaged in agriculture in some way. The nature of the engagement was different for men and women though, with young women specifically refraining from commercial agriculture. By analyzing the opportunity space of young men and women, we uncovered how their livelihood pathways were linked to a set of normative and structural constraints maintaining gender inequality. Examples were young women's weaker resource base (land) and gender norms which discourage young women's independent commercial (agricultural) activities. To advance the engagement of young men and especially women in commercial agriculture, it is important to acknowledge these patterns and their underlying structural gender differences.

    Pre-clinical protein screening in bioengineered intestinal tubules
    Jochemsen, P. ; Garssen, Johan ; Rietveld, P. ; Ariens, R.M.C. ; Bastiaan-Net, S. ; Wichers, H.J. ; Bergenhenegouwen, Jeroen van; Masereeuw, Rosalinde - \ 2019
    - 1 p.
    Environmental hotspots for azole resistance selection of aspergillus fumigatus, the netherlands
    Schoustra, Sijmen E. ; Debets, Alfons J.M. ; Rijs, Antonius J.M.M. ; Zhang, Jianhua ; Snelders, Eveline ; Leendertse, Peter C. ; Melchers, Willem J.G. ; Rietveld, Anton G. ; Zwaan, Bas J. ; Verweij, Paul E. - \ 2019
    Emerging Infectious Diseases 25 (2019)7. - ISSN 1080-6040 - p. 1347 - 1353.

    Azole resistance is a major concern for treatment of infections with Aspergillus fumigatus. Environmental resistance selection is a main route for Aspergillus spp. to acquire azole resistance. We investigated the presence of environmental hotspots for resistance selection in the Netherlands on the basis of the ability of A. fumigatus to grow and reproduce in the presence of azole fungicide residues. We identified 3 hotspots: Flower bulb waste, green waste material, and wood chippings. We recovered azole-resistant A. fumigatus from these sites; all fungi contained cyp51A tandem repeat–mediated resistance mechanisms identical to those found in clinical isolates. Tebuconazole, epoxiconazole, and prothioconazole were the most frequently found fungicide residues. Stockpiles of plant waste contained the highest levels of azole-resistant A. fumigatus, and active aerobic composting reduced Aspergillus colony counts. Preventing plant waste stockpiling or creating unfavorable conditions for A. fumigatus to grow in stockpiles might reduce environmental resistance burden.

    Culturally embedded practices of managing banana diversity and planting material in central Uganda
    Kilwinger, F.B.M. ; Rietveld, A.M. ; Groot, J.C.J. ; Almekinders, C.J.M. - \ 2019
    Journal of Crop Improvement 33 (2019)4. - ISSN 1542-7528 - p. 456 - 477.
    Agro-biodiversity - genetic diversity - Musa sp - seed sourcing strategies - seed system interventions

    Formal seed systems aim to provide farmers with high-quality planting material that meets evolving demands and cultivation challenges. East African banana (Musa sp.) systems rely strongly on informal seed exchange. For seed system interventions to have a larger and more sustainable impact in such a context, it is necessary to better understand the informal seed system. We studied the management and replacement dynamics around banana suckers and mats by smallholder farmers in Central Uganda. Data were collected through Focus Group Discussions (n = 4) and semi-structured interviews (n = 23). This study showed that, on average, banana farmers grew 10 different banana cultivars to ensure year-round harvesting and to accommodate multiple consumption and cultural needs. They included cultivars from the formal seed system within their portfolios of banana cultivars while also conserving cultivar diversity. Farmers used a broad array of evaluation criteria to select suckers and preferred to use known sources to assure plant quality. Household characteristics, such as age or wealth, are determinants of mat management and replacement. We concluded that a flexible blend of formal-informal approaches to developing the banana seed system is needed to meet the multiple needs of farm households and to support them in improving productivity and dealing with emerging challenges.

    Lokale verbindingen : Een verkenning naar het betrekken van burgers bij kleine stations in: Deurne, Vierlingsbeek en Coevorden
    Rietveld, M.P. ; Aalvanger, A. - \ 2018
    Wageningen : Wageningen University & Research, Wetenschapswinkel - 6 p.
    Lokale verbindingen : Een verkenning naar het betrekken van burgers bij kleine stations in: Deurne, Vierlingsbeek en Coevorden
    Rietveld, Mark ; Aalvanger, Aalbert - \ 2018
    Wageningen : Wageningen University & Research, Wetenschapswinkel (Wageningen University & Research Wetenschapswinkel rapport 348) - ISBN 9789463435451 - 45
    CD-MUSIC-EDL modeling of Pb2+ adsorption on birnessites : Role of vacant and edge sites
    Zhao, Wei ; Tan, Wenfeng ; Wang, Mingxia ; Xiong, Juan ; Liu, Fan ; Weng, Liping ; Koopal, Luuk K. - \ 2018
    Environmental Science and Technology 52 (2018)18. - ISSN 0013-936X - p. 10522 - 10531.
    adsorption - Birnessite - CD-MUSIC Modeling - Electrical double layer model - External surface - Interlayer space - Manganese oxide - Mn average oxidation state - Pb - Rietveld refinement

    The surface complexation modeling of metal adsorption to birnessites is in its infancy compared to the charge-distribution multi-site ion complexation (CD-MUSIC) models for iron/aluminum (hydr)oxides. Therefore, using X-ray diffraction with Rietveld refinement to obtain the reactive sites and their densities, a CD-MUSIC model combined with a Stern-Gouy-Chapman electrical double layer (EDL) model for the external surface and a Donnan model for the interlayer surface is developed for birnessites with different Mn average oxidation state (MnAOS). Proton affinity constants and the charge distributions of Pb surface complexes were calculated a priory. By fitting Pb adsorption data to the model the obtained equilibrium constants (logKPb) of Pb complexes were 6.9-10.9 for the double-corner-sharing and double-edge-sharing Pb2+ complexes on the edge sites and 2.2-6.5 for the triple-corner-sharing Pb2+ complex on the vacancies. The larger logKPb value was obtained for higher MnAOS. Speciation calculations showed that with increasing MnAOS from 3.67 to 3.92 the interlayer surface contribution to the total Pb2+ adsorption increased from 43.2% to 48.6%, and the vacancy contribution increased from 43.9% to 54.7%. The vacancy contribution from interlayer surface was predominant. The present CD-MUSIC-EDL model contributes to understand better the difference in metal adsorption mechanism between birnessite and iron/aluminum (hydr)oxides.

    Synthesis and characterization of Zr- and Hf-doped nano-TiO2 as internal standards for analytical quantification of nanomaterials in complex matrices
    Ellis, Laura-Jayne A. ; Papadiamantis, Anastasios G. ; Weigel, Stefan ; Valsami-Jones, Eugenia - \ 2018
    Royal Society Open Science 5 (2018)6. - ISSN 2054-5703
    Hydrolysis/oxidation methods - Hydrothermal - Labelled titania and zirconia - Nanomaterials - Nanosafety - Reference materials

    The reliable quantification of nanomaterials (NMs) in complex matrices such as food, cosmetics and biological and environmental compartments can be challenging due to interactions with matrix components and analytical equipment (vials and tubing). The resulting losses along the analytical process (sampling, extraction, clean-up, separation and detection) hamper the quantification of the target NMs in these matrices as well as the compatibility of results and meaningful interpretations in safety assessments. These issues can be overcome by the addition of known amounts of internal/recovery standards to the sample prior to analysis. These standards need to replicate the behaviour of target analytes in the analytical process, which is mainly defined by the surface properties. Moreover, they need to carry a tag that can be quantified independently of the target analyte. As inductively coupled plasma mass spectrometry is used for the identification and quantification of NMs, doping with isotopes, target analytes or with chemically related rare elements is a promising approach. We present the synthesis of a library of TiO2 NMs doped with hafnium (Hf) and zirconium (Zr) (both low in environmental abundance). Zirconia NMs doped with Hf were also synthesized to complement the library. NMs were synthesized with morphological and size properties similar to commercially available TiO2. Characterization included: transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy, X-ray diffraction spectroscopy, Brunauer–Emmett–Teller total specific surface area analysis, cryofixation scanning electron microscopy, inductively coupled plasma optical emission spectroscopy and UV–visible spectrometry. The Ti: Hf and Ti:Zr ratios were verified and calculated using Rietveld refinement. The labelled NMs can serve as internal standards to track the extraction efficiency from complex matrices, and increase method robustness and traceability of characterization/quantification.

    Buurtenergie in de Wildemanbuurt : Een verkenning naar de mogelijkheid om energie te halen uit GFT-afval afval in de Wildemanbuurt, Amsterdam
    Rietveld, Mark ; Lie, R. - \ 2018
    Wageningen : Wageningen University & Research, Wetenschapswinkel - 6 p.
    External examiner, DesignLab, Gerrit Rietveld Academy Amsterdam
    Driessen, Clemens - \ 2017
    Sustainable intensification: tailoring innovations to end-user context
    Taulya, G. ; Attwood, S. ; Descheemaeker, K.K.E. ; Marinus, Wytze ; Braber, H. den; Ocimati, Walter ; Rietveld, A. ; Raineri, J. ; Quiroz, R. ; Remans, R. ; Schut, M. - \ 2017
    Biodigestion at the Neighbourhood Level : from community participation to waste separation
    Hiemstra, J. ; Lie, R. ; Rietveld, M. - \ 2017
    Urban Agriculture Magazine (2017)32. - ISSN 1571-6244 - p. 49 - 51.
    bio-energie - biobrandstoffen - biobased economy - reststromen - projecten - co-vergisting - digestaat - hernieuwbare energie - energiebronnen - organisch afval - recycling - bioenergy - biofuels - residual streams - projects - co-fermentation - digestate - renewable energy - energy sources - organic wastes
    Urban Agriculture magazine • number 32 • September 2017 49 www.ruaf.org High energy bills and litter on the streets caused a group of residents of the Wildeman neighbourhood in the district of Osdorp in Amsterdam to act. Expecting no solution from the municipality, they decided to take care of it themselves and tackled these two problems with one solution: using the technology of biodigestion to produce energy from municipal food waste - a perfect example of the urban food-waste-energy nexus.
    Genome-wide analysis identifies 12 loci influencing human reproductive behavior
    Barban, Nicola ; Jansen, Rick ; Vlaming, Ronald de; Vaez, Ahmad ; Mandemakers, Jornt J. ; Tropf, Felix C. ; Shen, Xia ; Wilson, James F. ; Chasman, Daniel I. ; Nolte, Ilja M. ; Tragante, Vinicius ; Laan, Sander W. van der; Perry, John R.B. ; Kong, Augustine ; Ahluwalia, Tarunveer S. ; Albrecht, Eva ; Yerges-Armstrong, Laura ; Atzmon, Gil ; Auro, Kirsi ; Ayers, Kristin ; Bakshi, Andrew ; Ben-Avraham, Danny ; Berger, Klaus ; Bergman, Aviv ; Bertram, Lars ; Bielak, Lawrence F. ; Bjornsdottir, Gyda ; Bonder, Marc Jan ; Broer, Linda ; Bui, Minh ; Barbieri, Caterina ; Cavadino, Alana ; Chavarro, Jorge E. ; Turman, Constance ; Concas, Maria Pina ; Cordell, Heather J. ; Davies, Gail ; Eibich, Peter ; Eriksson, Nicholas ; Esko, Tõnu ; Eriksson, Joel ; Falahi, Fahimeh ; Felix, Janine F. ; Fontana, Mark Alan ; Franke, Lude ; Gandin, Ilaria ; Gaskins, Audrey J. ; Gieger, Christian ; Gunderson, Erica P. ; Guo, Xiuqing ; Hayward, Caroline ; He, Chunyan ; Hofer, Edith ; Huang, Hongyan ; Joshi, Peter K. ; Kanoni, Stavroula ; Karlsson, Robert ; Kiechl, Stefan ; Kifley, Annette ; Kluttig, Alexander ; Kraft, Peter ; Lagou, Vasiliki ; Lecoeur, Cecile ; Lahti, Jari ; Li-Gao, Ruifang ; Lind, Penelope A. ; Liu, Tian ; Makalic, Enes ; Mamasoula, Crysovalanto ; Matteson, Lindsay ; Mbarek, Hamdi ; McArdle, Patrick F. ; McMahon, George ; Meddens, S.F.W. ; Mihailov, Evelin ; Miller, Mike ; Missmer, Stacey A. ; Monnereau, Claire ; Most, Peter J. van der; Myhre, Ronny ; Nalls, Mike A. ; Nutile, Teresa ; Kalafati, Ioanna Panagiota ; Porcu, Eleonora ; Prokopenko, Inga ; Rajan, Kumar B. ; Rich-Edwards, Janet ; Rietveld, Cornelius A. ; Robino, Antonietta ; Rose, Lynda M. ; Rueedi, Rico ; Ryan, Kathleen A. ; Saba, Yasaman ; Schmidt, Daniel ; Smith, Jennifer A. ; Stolk, Lisette ; Streeten, Elizabeth ; Tönjes, Anke ; Thorleifsson, Gudmar ; Ulivi, Sheila ; Wedenoja, Juho ; Wellmann, Juergen ; Willeit, Peter ; Yao, Jie ; Yengo, Loic ; Zhao, Jing Hua ; Zhao, Wei ; Zhernakova, Daria V. ; Amin, Najaf ; Andrews, Howard ; Balkau, Beverley ; Barzilai, Nir ; Bergmann, Sven ; Biino, Ginevra ; Bisgaard, Hans ; Bønnelykke, Klaus ; Boomsma, Dorret I. ; Buring, Julie E. ; Campbell, Harry ; Cappellani, Stefania ; Ciullo, Marina ; Cox, Simon R. ; Cucca, Francesco ; Toniolo, Daniela ; Davey-Smith, George ; Deary, Ian J. ; Dedoussis, George ; Deloukas, Panos ; Duijn, Cornelia M. van; Geus, Eco J.C. de; Eriksson, Johan G. ; Evans, Denis A. ; Faul, Jessica D. ; Sala, Cinzia Felicita ; Froguel, Philippe ; Gasparini, Paolo ; Girotto, Giorgia ; Grabe, Hans-Jörgen ; Greiser, Karin Halina ; Groenen, Patrick J.F. ; Haan, Hugoline G. de; Haerting, Johannes ; Harris, Tamara B. ; Heath, Andrew C. ; Heikkilä, Kauko ; Hofman, Albert ; Homuth, Georg ; Holliday, Elizabeth G. ; Hopper, John ; Hyppönen, Elina ; Jacobsson, Bo ; Jaddoe, Vincent W.V. ; Johannesson, Magnus ; Jugessur, Astanand ; Kähönen, Mika ; Kajantie, Eero ; Kardia, Sharon L.R. ; Keavney, Bernard ; Kolcic, Ivana ; Koponen, Päivikki ; Kovacs, Peter ; Kronenberg, Florian ; Kutalik, Zoltan ; Bianca, Martina la; Lachance, Genevieve ; Iacono, William G. ; Lai, Sandra ; Lehtimäki, Terho ; Liewald, David C. ; Lindgren, Cecilia M. ; Liu, Yongmei ; Luben, Robert ; Lucht, Michael ; Luoto, Riitta ; Magnus, Per ; Magnusson, Patrik K.E. ; Martin, Nicholas G. ; McGue, Matt ; McQuillan, Ruth ; Medland, Sarah E. ; Meisinger, Christa ; Mellström, Dan ; Metspalu, Andres ; Traglia, Michela ; Milani, Lili ; Mitchell, Paul ; Montgomery, Grant W. ; Mook-Kanamori, Dennis ; Mutsert, Renée de; Nohr, Ellen A. ; Ohlsson, Claes ; Olsen, Jørn ; Ong, Ken K. ; Paternoster, Lavinia ; Pattie, Alison ; Penninx, Brenda W.J.H. ; Perola, Markus ; Peyser, Patricia A. ; Pirastu, Mario ; Polasek, Ozren ; Power, Chris ; Kaprio, Jaakko ; Raffel, Leslie J. ; Räikkönen, Katri ; Raitakari, Olli ; Ridker, Paul M. ; Ring, Susan M. ; Roll, Kathryn ; Rudan, Igor ; Ruggiero, Daniela ; Rujescu, Dan ; Salomaa, Veikko ; Schlessinger, David ; Schmidt, Helena ; Schmidt, Reinhold ; Schupf, Nicole ; Smit, Johannes ; Sorice, Rossella ; Spector, Tim D. ; Starr, John M. ; Stöckl, Doris ; Strauch, Konstantin ; Stumvoll, Michael ; Swertz, Morris A. ; Thorsteinsdottir, Unnur ; Thurik, A.R. ; Timpson, Nicholas J. ; Tung, Joyce Y. ; Uitterlinden, André G. ; Vaccargiu, Simona ; Viikari, Jorma ; Vitart, Veronique ; Völzke, Henry ; Vollenweider, Peter ; Vuckovic, Dragana ; Waage, Johannes ; Wagner, Gert G. ; Wang, Jie Jin ; Wareham, Nicholas J. ; Weir, David R. ; Willemsen, Gonneke ; Willeit, Johann ; Wright, Alan F. ; Zondervan, Krina T. ; Stefansson, Kari ; Krueger, Robert F. ; Lee, James J. ; Benjamin, Daniel J. ; Cesarini, David ; Koellinger, Philipp D. ; Hoed, Marcel den; Snieder, Harold ; Mills, Melinda C. - \ 2016
    Nature Genetics 48 (2016)12. - ISSN 1061-4036 - p. 1462 - 1472.
    The genetic architecture of human reproductive behavior—age at first birth (AFB) and number of children ever born (NEB)—has a strong relationship with fitness, human development, infertility and risk of neuropsychiatric disorders. However, very few genetic loci have been identified, and the underlying mechanisms of AFB and NEB are poorly understood. We report a large genome-wide association study of both sexes including 251,151 individuals for AFB and 343,072 individuals for NEB. We identified 12 independent loci that are significantly associated with AFB and/or NEB in a SNP-based genome-wide association study and 4 additional loci associated in a gene-based effort. These loci harbor genes that are likely to have a role, either directly or by affecting non-local gene expression, in human reproduction and infertility, thereby increasing understanding of these complex traits.
    Low affinity of heterotrophic bacteria to loose deposits in drinking water distribution systems
    Poças, A. ; Napier, V. ; Neto, C. ; Ferreira, E. ; Benoliel, M.J. ; Rietveld, L.C. ; Vreeburg, J. ; Menaia, J. - \ 2015
    Journal of Water Services Research and Technology-Aqua 64 (2015)4. - ISSN 0003-7214 - p. 442 - 449.
    Discoloration - Drinking water distribution systems - Floc settling times - Heterotrophic bacteria - Loose deposits

    Loose deposits (LD) accumulate in drinking water distribution systems (DWDS) and may lead to tap water discoloration incidents upon resuspension. While inconvenient for the consumers and the water companies, discoloration may be accompanied by degradation of the microbiological quality of the water, and possibly to the transport of bacteria. The presence of heterotrophic bacteria towards LD with different characteristics was investigated. Bacterial loads in discoloured water samples and LD concentrated over different settling times were analysed. Total heterotrophic (TH) bacteria numbers did not relate to turbidity or to suspended solids in discoloured waters. Higher affinities of TH were observed for slower-settling LD (<24 h), which were also richer in microbial extracellular polymeric substances. The detection of viable iron-oxidizing bacteria in LD supported their possible roles in LD formation and may be related to microbial growth/regrowth in DWDS. Results suggest that LD may exhibit low affinities to hold and transport bacteria, at least to TH in chlorinated water supplies.

    Characterization of PVC joints' behaviour during variable loading laboratory tests
    Arsénio, André Marques ; Vreeburg, J.H.G. ; Bouma, Freddie ; Rietveld, J.C. - \ 2015
    Urban Water Journal 12 (2015)7. - ISSN 1573-062X - p. 588 - 596.
    condition assessment - joints - non-destructive evaluation (NDE) - PVC

    With the objective of defining parameters that can be used to assess the condition of PVC joints in the field, more than two-hundred destructive tests were done in the laboratory. Two diameters (110 mm and 315 mm) of new PVC double-sockets were tested. The occurrence of leakage during water pressure tests, intrusion during vacuum tests and characterization of joint stiffness during rotation were monitored. The results clearly demonstrate that leakage and intrusion do not occur for typical operational situations (angles below 10 degrees) if the rubber ring is in perfect condition. The joint's stiffness increases with the increase of inner-pipe pressure, diameter and with the level of insertion. Insertion plays the most relevant role. The results also show that the condition of a joint cannot only be defined by its angle, but that an extra parameter is necessary: the level of insertion.

    Pilot studies on discolouration loose deposits' build-up
    Poças, Ana ; Rebola, Nazaré ; Rodrigues, Sérgio ; Benoliel, Maria João ; Rietveld, Luuk ; Vreeburg, Jan ; Menaia, José - \ 2015
    Urban Water Journal 12 (2015)8. - ISSN 1573-062X - p. 631 - 638.
    discolouration - drinking water - loose deposits build-up - pilot studies

    Tap water discolouration occurs due to resuspension of loose deposits (LD) that accumulate in drinking water distribution systems. Strategies for discolouration control involve network pipe cleaning and replacement of cast-iron pipes. However, the sole application of such measures is not generally effective. Therefore, a deeper understanding on processes associated with LD origin and development is required. Transparent (but covered) test rig pipes (Ø = 23 mm) continuously supplied with drinking water at steady flow through mode (7–9 months) were used to investigate LD build-up under laminar flow (0.2–4.1 cm/s) conditions. Rather than continuously and homogeneously, LD developed as spots, and predominantly at the pipes' bottom. Results suggested that particle attachment may be added to settling as a LD build-up process. This is consistent with LD cohesive–adhesive properties, as shown by LD repose angle tests, as well as to the occurrence of flocculent extracellular polymeric substances-EPS in LD.

    Pipe failure predictions in drinking water systems using satellite observations
    Arsénio, André Marques ; Dheenathayalan, Prabu ; Hanssen, Ramon ; Vreeburg, Jan ; Rietveld, Luuk - \ 2015
    Structure and Infrastructure Engineering 11 (2015)8. - ISSN 1573-2479 - p. 1102 - 1111.
    failure analysis - pipe networks - satellite observations - underground infrastructure - water supply

    Soil deformation is believed to play a crucial role in the onset of failures in the underground infrastructure. This article describes a method to generate a replacement-prioritisation map for underground drinking water pipe networks using ground movement data. A segment of the distribution network of a Dutch drinking water company was selected as the study area. Failure registration data comprising 868 failures registered over 40 months and geographical network data were obtained from the water utility. Ground movement was estimated using radar satellite data. Two types of analyses were performed: cell and pixel based. For the cell-based analysis, asbestos cement (AC) pipes exhibited the highest failure rates. Older AC pipes were also shown to fail more often, whereas failure rates for PVC were the lowest. For the pixel-based analysis, ground movement was demonstrated to play a role in the failure of all materials combined. Therefore, a replacement-prioritisation map for AC was generated which combined ground movement data and pipe-age data. This method can be a beneficial resource for network managers for maintenance and continuous monitoring.

    Een evaluatiekader voor ontgrondingen : Een studie naar de maatschappelijke gevolgen van ontgrondingen
    Haaften, M. ; Heijman, W.J.M. ; Rietveld, M. - \ 2015
    Water Governance 5 (2015)3. - ISSN 2211-0224 - p. 24 - 30.
    markteconomie - regionaal beleid - maatschappelijk draagvlak - grondverzet - effecten - nadelige gevolgen - vergunningen - gelderland - market economics - regional policy - public support - earth moving - effects - adverse effects - permits - gelderland
    Op 1 februari 2008 verdween de plicht van provincies om van tevoren vastgestelde hoeveelheden zand en grind te leveren Deze beleidswijziging van taakstelling naar marktwerking werd doorgevoerd vanwege een slechte voorspelbaarheid van de behoefte aan zand en grind, een tanend maatschappelijk draagvlak en de wens om beleidskosten te verminderen. In het nieuwe beleid is economisch belang gekoppeld aan het creëren van maatschappelijk draagvlak. Overheden, omwonenden en bedrijven leveren vanuit hun betrokkenheid een bijdrage aan de afweging van gevolgen van ontgrondingen op maatschappelijk en economisch terrein. Deze gevolgen doen zich op kortere of langere termijn voor, op lokaal, regionaal en nationaal niveau. Een afwegingskader dat de gevolgen van het ontgronden beschrijft, inzichtelijk maakt en beoordeelt, ontbreekt tot op heden. Hetgeen het besluitvormingsproces inzake het verlenen van ontgrondingvergunningen niet transparant maakt. Het doel van dit artikel is tweeledig. Eerst worden de mogelijke gevolgen van ontgrondingen geïnventariseerd, daarna wordt ex post geëvalueerd hoe de afweging van gevolgen een plaats heeft gekregen in het beleid van de Provincie Gelderland. Het artikel besluit met een aantal aanbevelingen ter vergroting van het maatschappelijk draagvlak voor ontgrondingen.
    Advanced control of a water supply system: A case study
    Bakker, M. ; Rajewicz, T. ; Kien, H. ; Vreeburg, J.H.G. ; Rietveld, L.C. - \ 2014
    Water Practice and Technology 9 (2014)2. - ISSN 1751-231X - p. 264 - 276.
    Optimal control - Pressure management - Water demand forecasting

    Conventional automatic production flow control and pump pressure control of water supply systems are robust and simple: production flow is controlled based on the level in the clear water reservoir and pump pressure is controlled on a static set-point. Recently, more advanced computer-based control methods were developed in which production flow is controlled by using a short-term water demand forecasting model and pressure is controlled by a dynamic pressure control module. To assess the differences between conventional and advanced control, we examined operational data of water treatment plantGruszczyn that supplies drinking water to a part of the city of Poznan, Poland. We compared two periods of three weeks of conventional and advanced control. The comparison showed that with advanced control the variation in the production flow was 83% lower, and the pump pressure of the clear water pumps was 29% lower. The lower pressure resulted in 20% less background leakage and the overall system's energy costs were 11.5% lower.

    Detecting pipe bursts using Heuristic and CUSUM methods
    Bakker, M. ; Jung, D. ; Vreeburg, J. ; De Roer, M. Van; Lansey, K. ; Rietveld, L. - \ 2014
    Procedia Engineering 70 (2014). - ISSN 1877-7058 - p. 85 - 92.
    Demand forecasting - Pipe burst detection - SPC methods

    Pipe bursts in a drinking water distribution system lead to water losses, interruption of supply, and damage to streets and houses due to the uncontrolled water flow. To minimize the negative consequences of pipe bursts, an early detection is necessary. This paper describes a heuristic burst detection method, which continuously compares forecasted and measured values of the water demand. The forecasts of the water demand were generated by an adaptive water demand forecasting model. To test the method, a dataset of five years of water demand data in a supply area in the Western part of the Netherlands was collected. The method was tested on a subset of the data (only the winter months) in which 9 (larger) burst events were reported. The detection probability for the reported bursts was 44.4%, at an acceptable rate of false alarms of 5.0%. The results were compared with the CUSUM method, which is a general statistical process control (SPC) method to identify anomalies in time series. The heuristic and CUSUM methods generated comparable results, although rate of false alarm for the heuristic method was lower at the same detection probability.

    Check title to add to marked list
    << previous | next >>

    Show 20 50 100 records per page

     
    Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.