document

A distributed-temperature-sensing-based soil temperature profiler

Schilperoort, B. (author), JIMENEZ RODRIGUEZ, C.D. (author), van de Wiel, B.J.H. (author), Coenders-Gerrits, Miriam (author)

Storage change in heat in the soil is one of the main components of the energy balance and is essential in studying the land-Atmosphere heat exchange. However, its measurement proves to be difficult due to (vertical) soil heterogeneity and sensors easily disturbing the soil. Improvements in the precision and resolution of distributed...

journal article 2024

document

Plant–atmosphere heat exchange during wind machine operation for frost protection

Boekee, J. (author), Dai, Y. (author), Schilperoort, B. (author), van de Wiel, B.J.H. (author), ten Veldhuis, Marie-claire (author)

To mitigate spring frost damage, fruit farmers use wind machines to mix warm overlying air down to the vegetation. Up to this point, studies on wind machine efficiency have focused on air temperatures. The temperature of different plant organs during operation remains unknown, while critical for the actual degree of frost damage. With...

journal article 2023

document

Phenophase-based comparison of field observations to satellite-based actual evaporation estimates of a natural woodland: miombo woodland, southern Africa

Zimba, H.M. (author), Coenders-Gerrits, Miriam (author), Kawawa, Banda (author), Schilperoort, B. (author), van de Giesen, N.C. (author), Nyambe, Imasiku (author), Savenije, Hubert (author)

The trend and magnitude of actual evaporation across the phenophases of miombo woodlands are unknown. This is because estimating evaporation in African woodland ecosystems continues to be a challenge, as flux observation towers are scant if not completely lacking in most ecosystems. Furthermore, significant phenophase-based discrepancies in both...

journal article 2023

document

Normalisation of SARS-CoV-2 concentrations in wastewater: The use of flow, electrical conductivity and crAssphage

Langeveld, J.G. (author), Schilperoort, Remy (author), Heijnen, Leo (author), Elsinga, Goffe (author), Schapendonk, Claudia E.M. (author), Fanoy, Ewout (author), de Schepper, Evelien I.T. (author), Koopmans, Marion P.G. (author), de Graaf, Miranda (author), Medema, G.J. (author)

Over the course of the Corona Virus Disease-19 (COVID-19) pandemic in 2020–2022, monitoring of the severe acute respiratory syndrome coronavirus 2 ribonucleic acid (SARS-CoV-2 RNA) in wastewater has rapidly evolved into a supplementary surveillance instrument for public health. Short term trends (2 weeks) are used as a basis for policy and...

journal article 2023

document

Wind machines for frost damage mitigation: A quantitative 3D investigation based on observations

Dai, Y. (author), Boekee, J. (author), Schilperoort, B. (author), ten Veldhuis, Marie-claire (author), van de Wiel, B.J.H. (author)

Wind machines have been increasingly used for frost damage mitigation in the agricultural community. During radiative frost nights, wind machines are used to erode near-surface thermal inversion by air mixing. The underlying mixing processes remain poorly understood. A full picture of warming effects caused by air mixing requires measurements...

journal article 2023

document

The potential of near real-time monitoring of β-d-glucuronidase activity to establish effective warning systems in urban recreational waters

Makris, K. (author), Hoefeijzers, Bas (author), Seelen, Laura (author), Schilperoort, R.P.S. (author), Langeveld, J.G. (author)

Urban water is a crucial element of cities for the purpose of events and recreation, raising concern over the water quality and related hygienic safety. In this study, a near real-time monitoring system of the β-d-glucuronidase activity, the BACTcontrol, was tested in the canals of Breda city in the Netherlands in order to gain insight in its...

journal article 2023

document

A comparative study between low- and high-tech methods for the detection and mitigation of illicit connections in stormwater systems

Schilperoort, Remy (author), Post, Johan (author), Klootwijk, Martijn (author), Hoefeijzers, Bas (author), Hof, Arjo (author), Palsma, Bert (author), Leenen, Imke (author), Makris, Konstantinos F. (author), Langeveld, J.G. (author)

Illicit connections of wastewater to stormwater systems are the main drawback of separate sewer systems, as they lead to a direct discharge of untreated wastewater to the aquatic environment. Consequently, several inspection methods have been developed for detecting illicit connections. This study simultaneously applied several low- and high...

journal article 2023

document

High Potential: Design, modelling, and fabrication of a novel unipolar micro-electret transducer

Schilperoort, Frank (author)

Electret transducers utilize the electric field generated by an electret, a dielectric with a quasi-permanent embedded charge, to induce charge on an electrode. When the electret is moved relative to the electrode, the induced charge magnitude on the electrode changes, generating a current that can be used to convert mechanical energy into...

master thesis 2022

document

Heat Exchange in a Conifer Canopy: A Deep Look using Fiber Optic Sensors

Schilperoort, B. (author)

Forests cover a large part of the globe, and are responsible for a large amount of evaporation and the fixation of carbon. To be able to better understand this atmospheric exchange of forests, and how the forests will behave under future climate change, both accurate measurements as well as models are required. However, due to their height and...

doctoral thesis 2022

document

Comparative analysis in thermal behaviour of common urban building materials and vegetation and consequences for urban heat island effect

Stache, E. (author), Schilperoort, B. (author), Ottele, M. (author), Jonkers, H.M. (author)

The urban heat island, is a serious threat for the urban well-being, and can be determined by the local energy balance. The surface energy balance, with respect to incoming radiative energy and subsequent partitioning into reflected energy (albedo), absorbed energy and further partitioning of latter into convectional heat (QH), radiative heat ...

journal article 2022

document

Detecting nighttime inversions in the interior of a Douglas fir canopy

Schilperoort, B. (author), Coenders-Gerrits, Miriam (author), JIMENEZ RODRIGUEZ, C.D. (author), van Hooft, J.A. (author), van de Wiel, B.J.H. (author), Savenije, Hubert (author)

Despite the importance of forests in the water and carbon cycles, accurately measuring their contribution remains challenging, especially at night. During clear-sky nights current models and theories fail, as non-turbulent flows and spatial heterogeneity become more important. One of the standing issues is the ‘decoupling’ of the air masses...

journal article 2022

document

Thermodynamics of a fast-moving Greenlandic outlet glacier revealed by fiber-optic distributed temperature sensing

Law, Robert (author), Christoffersen, Poul (author), Hubbard, Bryn (author), Doyle, Samuel H. (author), Chudley, Thomas R. (author), Schoonman, Charlotte M. (author), Bougamont, Marion (author), des Tombe, B.F. (author), Schilperoort, B. (author), Kechavarzi, Cedric (author), Booth, Adam (author), Young, Tun Jan (author)

Measurements of ice temperature provide crucial constraints on ice viscosity and the thermodynamic processes occurring within a glacier. However, such measurements are presently limited by a small number of relatively coarse-spatial-resolution borehole records, especially for ice sheets. Here, we advance our understanding of glacier...

journal article 2021

document

Vapor plumes in a tropical wet forest: Spotting the invisible evaporation

JIMENEZ RODRIGUEZ, C.D. (author), Coenders-Gerrits, Miriam (author), Schilperoort, B. (author), del Pilar González-Angarita, Adriana (author), Savenije, Hubert (author)

Forest evaporation exports a vast amount of water vapor from land ecosystems into the atmosphere. Meanwhile, evaporation during rain events is neglected or considered of minor importance in dense ecosystems. Air convection moves the water vapor upwards leading to the formation of large invisible vapor plumes, while the identification of...

journal article 2021

document

Towards a physics-based understanding of fruit frost protection using wind machines

Heusinkveld, Vincent W.J. (author), van Hooft, J.A. (author), Schilperoort, B. (author), Baas, P. (author), ten Veldhuis, Marie-claire (author), van de Wiel, B.J.H. (author)

Wind machines are used in the agricultural sector to prevent or mitigate the adverse effects of night frost in spring. In this study we aim to quantify the impact of wind machine operation on the local temperature field in an orchard. To this end, a field experiment is conducted and experimental analysis is combined with numerical simulation...

journal article 2020

document

Decoupling of a Douglas fir canopy: A look into the subcanopy with continuous vertical temperature profiles

Schilperoort, B. (author), Coenders-Gerrits, Miriam (author), JIMENEZ RODRIGUEZ, C.D. (author), van der Tol, Christiaan (author), van de Wiel, B.J.H. (author), Savenije, Hubert (author)

Complex ecosystems such as forests make accurately measuring atmospheric energy and matter fluxes difficult. One of the issues that can arise is that parts of the canopy and overlying atmosphere can be turbulently decoupled from each other, meaning that the vertical exchange of energy and matter is reduced or hampered. This complicates flux...

journal article 2020

document

Estimation of temperature and associated uncertainty from fiber-optic raman-spectrum distributed temperature sensing

des Tombe, B.F. (author), Schilperoort, B. (author), Bakker, M. (author)

Distributed temperature sensing (DTS) systems can be used to estimate the temperature along optic fibers of several kilometers at a sub-meter interval. DTS systems function by shooting laser pulses through a fiber and measuring its backscatter intensity at two distinct wavelengths in the Raman spectrum. The scattering-loss coefficients for...

journal article 2020

document

Revisiting wind speed measurements using actively heated fiber optics: A wind tunnel study

van Ramshorst, Justus G.V. (author), Coenders-Gerrits, Miriam (author), Schilperoort, B. (author), van de Wiel, B.J.H. (author), Izett, J.G. (author), Selker, J.S. (author), Higgins, Chad W. (author), Savenije, Hubert (author), van de Giesen, N.C. (author)

Near-surface wind speed is typically only measured by point observations. The actively heated fiber-optic (AHFO) technique, however, has the potential to provide high-resolution distributed observations of wind speeds, allowing for better spatial characterization of fine-scale processes. Before AHFO can be widely used, its performance needs...

journal article 2020

document

Missed Fog: Understanding the Growth of Fog from the Ground Up

Izett, J.G. (author), van de Wiel, B.J.H. (author), Schilperoort, B. (author), Coenders-Gerrits, Miriam (author), Baas, P. (author), Bosveld, Fred C. (author)

Conventional in situ observations of visibility and other meteorological variables are restricted to a limited number of heights near the surface, with the lowest observation often made above 1 m. This can result in missed observations of shallow fog as well as the initial growth stage of thicker fog layers. At the same time, numerical...

poster 2019

document

Missed Fog?: On the Potential of Obtaining Observations at Increased Resolution During Shallow Fog Events

Izett, J.G. (author), Schilperoort, Bart (author), Coenders-Gerrits, Miriam (author), Baas, P. (author), Bosveld, Fred C. (author), van de Wiel, B.J.H. (author)

Conventional in situ observations of meteorological variables are restricted to a limited number of levels near the surface, with the lowest observation often made around 1-m height. This can result in missed observations of both shallow fog, and the initial growth stage of thicker fog layers. At the same time, numerical experiments have...

journal article 2019

document

Using distributed temperature sensing (DTS) for locating and characterising infiltration and inflow into foul sewers before, during and after snowmelt period

Panasiuk, Oleksandr (author), Hedström, Annelie (author), Langeveld, J.G. (author), de Haan, Cornelis (author), Liefting, Erik (author), Schilperoort, Remy (author), Viklander, Maria (author)

Infiltration and inflow (I/I) into sewers cause negative effects on the sewer system, wastewater treatment plant and environment. Identifying the causes and locating the inflows is necessary in order to address the I/I problem. This paper focuses on using distributed temperature sensing (DTS) for identifying, locating and characterising I/I...

journal article 2019