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A passive heat tracer experiment to determine the seasonal variation in residence times in a managed aquifer recharge system with DTS

des Tombe, B.F. (author), Bakker, M. (author), Schaars, F (author), van der Made, KJ (author), Calje, R (author), Borst, L. (author)

Targeted provisional session N°8.01 The seasonal variation in residence times is determined in a managed aquifer recharge system using a passive heat tracer test. The managed aquifer recharge system consists of a sequence of alternating elongated recharge basins and rows of recovery wells. The temperature of both the water in the recharge basin...

abstract 2016

document

Tunnel valleys: Genetic models, sedimentary infill and 3D architecture

Janszen, A. (author)

During its geological history, earth has experienced several periods of extreme cold climate. During these glaciations, ice sheets covered large parts of the globe. Because of the erosive power of flowing meltwater and ice, deep incisions, such as fjords, are an important aspect of the glacial environment. This thesis covers one specific type of...

doctoral thesis 2012

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Water and chemical budgets of gravel pit lakes: Case studies of fluvial gravel pit lakes along the Meuse River (The Netherlands) and coastal gravel pit lakes along the Adriatic Sea (Ravenna, Italy)

Mollema, P.N. (author)

Gravel pit lakes form when gravel is excavated from below the water table of a phreatic or shallow confined aquifer. Typically many of these lakes are concentrated along naturally occurring sedimentary gravel deposits in areas where gravel is needed for construction. Most gravel pit lakes are relatively young features: most are less than 50...

doctoral thesis 2016

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Landslide hazard assessment: Hydro-meteorological thresholds in Rwanda

Uwihirwe, J. (author)

For the development of regional landslide early warning systems, empirical-statistical thresholds are of crucial importance. The thresholds indicate the meteorological and hydrological conditions initiating landslides and are an affordable approach towards reducing people’s vulnerability to landslide hazards. This thesis defined different...

doctoral thesis 2023

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Field Experiments and Reactive Transport Modeling of Subsurface Arsenic Removal in Bangladesh

Rahman, M.M. (author)

The principle of Subsurface Arsenic (As) Removal (SAR) is to extract anoxic groundwater, aerate it and reinject it. Oxygen in the injected water reacts with iron in the resident groundwater to form hydrous ferric oxide (HFO). Dissolved As sorbs onto the HFO, which allows for the extraction of groundwater with lower As concentrations.

doctoral thesis 2017

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Measuring horizontal groundwater flow with distributed temperature sensing along cables installed with direct-push equipment

des Tombe, B.F. (author)

The pressure on groundwater systems, especially in coastal regions, increases as the population rapidly grows. In these regions, management of water tables and fluxes is important to minimize droughts, salt-water intrusion, and flooding. Proper management of such groundwater systems requires knowledge of how groundwater responds to water...

doctoral thesis 2021

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A solid oxide fuel cell fuelled by methane recovered from groundwater

Saadabadi, S.A. (author), van Linden, N. (author), Heinsbroek, Abel (author), Aravind, P.V. (author)

This study investigates the feasibility of electricity production in a solid oxide fuel cell using methane recovered from groundwater as the fuel. Methane must be removed from groundwater for the production of drinking water to, amongst others, avoid bacterial regrowth. Instead of releasing methane to the atmosphere or converting it to carbon...

journal article 2021

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Dominant factors determining the hydraulic conductivity of sedimentary aquitards: A random forest approach

van Leer, Martijn D. (author), Zaadnoordijk, Willem (author), Zech, Alraune (author), Buma, Jelle (author), Harting, Ronald (author), Bierkens, Marc F.P. (author), Griffioen, Jasper (author)

Aquitards are common hydrogeological features and their hydraulic conductivity is an important property for various groundwater management issues. Predicting their hydraulic conductivity proves challenging, given its dependence on numerous variables. In this study, the dominant factors for predicting aquitard hydraulic conductivity are...

journal article 2023

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Peak grain forecasts for the US High Plains amid withering waters

Mrad, Assaad (author), Katul, Gabriel G. (author), Levia, Delphis F. (author), Guswa, Andrew J. (author), Boyer, Elizabeth W. (author), Bruen, Michael (author), Carlyle-Moses, Darryl E. (author), Coyte, Rachel (author), van de Giesen, N.C. (author)

Irrigated agriculture contributes 40% of total global food production. In the US High Plains, which produces more than 50 million tons per year of grain, as much as 90% of irrigation originates from groundwater resources, including the Ogallala aquifer. In parts of the High Plains, groundwater resources are being depleted so rapidly that they...

journal article 2020

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Streams, sewage, and shallow groundwater: stream-aquifer interactions in the Kathmandu Valley, Nepal

Prajapati, Rajaram (author), Overkamp, Nick N. (author), Moesker, Niek (author), Happee, K. (author), van Bentem, R. (author), Danegulu, Anusha (author), Manandhar, Bikesh (author), Thapa, Amber Bahadur (author), Davids, J.C. (author)

The Kathmandu Valley in Nepal is facing a water quantity and quality crisis due to rapid urbanization and haphazard water and wastewater planning and management. Annually, groundwater extractions in the Kathmandu Valley exceed capture, resulting in groundwater table declines. Streams are often important sources of recharge to (or destination...

journal article 2021

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Anoxic storage to promote arsenic removal with groundwater-native iron

Annaduzzaman, M. (author), Rietveld, L.C. (author), Ghosh, D. (author), Hoque, Bilqis A. (author), van Halem, D. (author)

Storage containers are usually used to provide a constant water head in decentralized, community groundwater treatment systems for the removal of iron (Fe) and arsenic (As). However, the commonly practiced aeration prior to storage assists in rapid and complete Fe²⁺ oxidation, resulting in poor As removal, despite sufficient native...

journal article 2021

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Distributed memory parallel groundwater modeling for the Netherlands Hydrological Instrument

Verkaik, J. (author), Hughes, J.D. (author), van Walsum, P.E.V. (author), Oude Essink, G. H. P. (author), Lin, H.X. (author), Bierkens, M.F.P. (author)

Worldwide, billions of people rely on fresh groundwater reserves for their domestic, agricultural and industrial water use. Extreme droughts and excessive groundwater pumping put pressure on water authorities in maintaining sustainable water usage. High-resolution integrated models are valuable assets in supporting them. The Netherlands...

journal article 2021

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Sequential Fe²⁺ oxidation to mitigate the inhibiting effect of phosphate and silicate on arsenic removal

Annaduzzaman, M. (author), Rietveld, L.C. (author), Hoque, Bilqis Amin (author), van Halem, D. (author)

Sequential iron (as Fe²⁺) oxidation has been found to yield improved arsenic (as As(III)) uptake than the single-step oxidation. The objective of this study was to gain a better understanding of interactions with phosphate (PO₄³⁻) and silicate (SiO₄²⁻) during sequential Fe²⁺...

journal article 2022

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Groundwater-native Fe(II) oxidation prior to aeration with H₂O₂ to enhance As(III) removal

Roy, M. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)

Groundwater contaminated with arsenic (As) must be treated prior to drinking, as human exposure to As at toxic levels can cause various diseases including cancer. Conventional aeration-filtration applied to anaerobic arsenite (As(III)) contaminated groundwater can remove As(III) by co-oxidizing native iron (Fe(II)) and As(III) with oxygen (O...

journal article 2022

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Degradation of seven pesticides and two metabolites before and during aquifer storage transfer and recovery operation

Kruisdijk, E. (author), Stuyfzand, Pieter Jan (author), van Breukelen, B.M. (author)

Degradation of 7 common pesticides (bentazon, boscalid, chloridazon, fluopyram, flutolanil, imidacloprid, and methoxyfenozide) and 2 metabolites of chloridazon (desphenyl-chloridazon, and methyl-desphenyl-chloridazon) was studied in an anoxic and brackish sandy aquifer before and during Aquifer Storage Transfer and Recovery (ASTR) operation....

journal article 2022

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A critical review of arsenic occurrence, fate and transport in natural and modified groundwater systems in The Netherlands

Stuyfzand, Pieter Jan (author), Bonte, Matthijs (author)

Arsenic is a common trace element in groundwater and its fate and transport are controlled by combination of (i) natural processes, including redox conditions, salinity and pH, (ii) sedimentary and geochemical environment, and (iii) anthropogenic influences such as groundwater extraction, managed aquifer recharge (MAR), Aquifer Thermal Energy...

journal article 2023

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Combination of geostatistics and self-organizing maps for the spatial analysis of groundwater level variations in complex hydrogeological systems

Varouchakis, Emmanouil A. (author), Solomatine, D.P. (author), Corzo Perez, Gerald A. (author), Jomaa, Seifeddine (author), Karatzas, George P. (author)

Successful modelling of the groundwater level variations in hydrogeological systems in complex formations considerably depends on spatial and temporal data availability and knowledge of the boundary conditions. Geostatistics plays an important role in model-related data analysis and preparation, but has specific limitations when the aquifer...

journal article 2023

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Electrochemical arsenite oxidation for drinking water treatment: Mechanisms, by-product formation and energy consumption

Kraaijeveld, E. (author), Rijsdijk, S. (author), van der Poel, S. (author), van der Hoek, J.P. (author), Rabaey, K. (author), van Halem, D. (author)

The mechanisms and by-product formation of electrochemical oxidation (EO) for As(III) oxidation in drinking water treatment using groundwater was investigated. Experiments were carried out using a flowthrough system, with an RuO ₂/IrO ₂ MMO Ti anode electrode, fed with synthetic and natural groundwater containing As(III)...

journal article 2024

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Embedding Fe(0) electrocoagulation in a biologically active As(III) oxidising filter bed

Roy, M. (author), Kraaijeveld, E. (author), Gude, J.C.J. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)

Long-term consumption of groundwater containing elevated levels of arsenic (As) can have severe health consequences, including cancer. To effectively remove As, conventional treatment technologies require expensive chemical oxidants to oxidise neutral arsenite (As(III)) in groundwater to negatively charged arsenate (As(V)), which is more...

journal article 2024

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Integrating biological As(III) oxidation with Fe(0) electrocoagulation for arsenic removal from groundwater

Roy, M. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)

Arsenic (As) is a toxic element present in many (ground)water sources in the world. Most conventional As removal techniques require pre-oxidation of the neutral arsenite (As(III)) species to the negatively charged arsenate (As(V)) oxyanion to optimize As removal and minimize chemical use. In this work, a novel, continuous-flow As removal...

journal article 2021