Staff Publications

Staff Publications

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    '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.

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Netwerk Land en Water ‘Nieuwe wegen in de hydrologie’
Breugem, A. ; Knotters, M. - \ 2013
Stromingen : vakblad voor hydrologen 19 (2013)1. - ISSN 1382-6069 - p. 63 - 67.
hydrologie - monitoring - neerslag - stedelijke gebieden - gegevensverwerking - overstromingen - hoogwaterbeheersing - watergebruik - conferenties - hydrology - precipitation - urban areas - data processing - floods - flood control - water use - conferences
Op woensdag 20 juni 2012 belegde het Netwerk Land en Water een studiemiddag over het thema ‘Nieuwe wegen in de hydrologie’. Dit thema is ingegeven vanuit de verwachting dat door klimaatverandering extreme neerslaggebeurtenissen frequenter zullen optreden, wat kan leiden tot grote wateroverlast. Om voor deze gebeurtenissen adequate oplossingen te vinden zijn nieuwe wegen in de hydrologie noodzakelijk, zowel in de wetenschap als in de aan het beleid gekoppelde praktijk. Op deze middag werden in drie lezingen enkele wetenschappelijke ontwikkelingen in de hydrologie voor het voetlicht gebracht: - Stedelijke neerslagmetingen, door Marie-Claire ten Veldhuis (TuD); - Extreme neerslag en afvoerprocessen in het stroomgebied van de Hupselse Beek, door Claudia Brauer (WUR); - Operationele monitoring van hydrologische processen op verschillende schalen, door Henk Pelgrum van eLEAF
Remote sensing mapping of carbon and energy fluxes over forests
Roerink, G.J. ; Wit, A.J.W. de; Pelgrum, H. ; Mücher, C.A. - \ 2001
Wageningen : Alterra (CGI-report 7 / Alterra-rapport 179) - 78
bossen - energiebalans - meteorologie - microklimatologie - kooldioxide - cartografie - remote sensing - fluctuaties - wavelets - aardoppervlak - forests - energy balance - meteorology - microclimatology - carbon dioxide - mapping - fluctuations - land surface
This report presents the results of the EU project "Carbon and water fluxes of Mediterranean forests and impacts of land use/cover changes". The objectives of the project can be summarized as follows: (I) surface energy balance mapping using remote sensing, (ii) carbon uptake mapping using remote sensing and (iii) assessment of representativity of point measurements for large scale meteorological models. The Surface Energy Balance Index (SEBI) algorithm is successfully applied to satellite images in Spain and the Netherlands, whereafter the latent heat flux is linked to the carbon flux. Validation is carried out with field measurements. A wavelet analysis is performed to assess till what scale point measurements are good area-representatives.
Spatial aggregation of land surface characteristics: impact of resolution of remote sensing data on land surface modelling
Pelgrum, H. - \ 2000
Unknown Publisher - 160 p.
Length-scale analysis of surface albedo, temperature, and normalized difference vegetation index in desert grassland
Pelgrum, H. ; Schmugge, T. ; Rango, A. ; Ritchie, J. ; Kustas, B. - \ 2000
Water Resources Research 36 (2000)7. - ISSN 0043-1397 - p. 1757 - 1765.
Spatial aggregation of land surface characteristics : impact of resolution of remote sensing data on land surface modelling
Pelgrum, H. - \ 2000
Agricultural University. Promotor(en): R.A. Feddes, co-promotor(en): M. Menenti. - S.l. : S.n. - ISBN 9789058082435 - 151
landevaluatie - landclassificatie - landverdeling - landtypen - ruimtelijke variatie - aggregatie - remote sensing - gegevensanalyse - resolutie - aardoppervlak - land evaluation - land classification - land diversion - land types - spatial variation - aggregation - data analysis - resolution - land surface
<p>Land surface models describe the exchange of heat, moisture and momentum between the land surface and the atmosphere. These models can be solved regionally using remote sensing measurements as input. Input variables which can be derived from remote sensing measurements are surface albedo, surface temperature and vegetation cover. A land surface model using those land surface characteristics is presented i.e. the Surface Energy Balance Index (SEBI) model. This model uses the observed temperature difference between the land surface and atmosphere as an indicator for evapotranspiration.</p><p>Spatially distributed land surface model results can be used as a boundary condition for numerical weather predicton models. The results should therefore be aggregated from the remote sensing pixel scale to the atmospheric model scale. However aggregated values will differ when derived from remote sensing data with different resolutions. This difference, the error due to aggregation is caused by two different aspects: land surface heterogeneity and non-linearity of the land surface model. Two approaches are presented to quantify the error due to aggregation: the linearization approach, where the land surface model is approximated by a Taylor expansion and a geometrical approach where the range of valid results for the land surface model is derived using a convex hull.</p><p>To measure the heterogeneity of land surfaces, the concept of length scale is introduced. The wavelet transform is being used to derive the length scale of the land surface characteristics. The wavelet variance derived from the Fast Wavelet Transform using the Haar wavelet is a good indicator for the variability of land surface characteristics at different spatial scales. For three different data sets the length scale of land surface characteristics have been derived: Barrax, Spain, the Jornada Experimental Range, USA and the Central Part of the Netherlands.</p><p>The two approaches for quantifying the error due to aggregation have been verified using the three data sets. The results obtained by the linearization show that aggregation error can indeed be estimated. For the three test sites the large scale error did not exceed 10 %. However the results based on the convex hull analysis show that the large scale error due to aggregation can be much larger than observed for the three test cases. Therefore low resolution remote sensing data cannot be used a priori as input for land surface models.</p>
Remote sensing of land surface fluxes for updating numerical weather predictions
Su, Z. ; Menenti, M. ; Pelgrum, H. ; Hurk, B.J.J.M. van den; Bastiaanssen, W.G.M. - \ 1999
In: Operational remote sensing for sustainable development / Nieuwenhuis, G.J.A., Vaughan, R.A., Molenaar, M., Rotterdam : Balkema - p. 393 - 402.
Spatial resolution and heterogeneous landscapes: a case study in the EFEDA/Barrax area
Su, Z. ; Pelgrum, H. ; Menenti, M. - \ 1999
In: Mesoscale climate hydrology: the contribution of the new observing systems / Su, Z., Menenti, M., Wageningen : SC-DLO (Report USP-2 99-05) - p. 78 - 92.
Aggregation effects of surface heterogeneity in land surface processes
Su, Z. ; Pelgrum, H. ; Menenti, M. - \ 1999
Hydrology and Earth System Sciences 3 (1999)4. - ISSN 1027-5606 - p. 549 - 563.
A remote sensing surface energy balance algorithm for land (SEBAL); 2 validation
Bastiaanssen, W.G.M. ; Pelgrum, H. ; Wang, J. ; Ma, Y. ; Moreno, J.F. ; Roerink, G.J. ; Wal, T. van der - \ 1998
Journal of Hydrology 212-213 (1998)1-4. - ISSN 0022-1694 - p. 213 - 229.
land - oppervlakten - energiebalans - evaporatie - remote sensing - algoritmen - surfaces - energy balance - evaporation - algorithms
Aggregation of land surface parameters in the oasis-desert systems of north-west China
Wang, J. ; Bastiaanssen, W.G.M. ; Ma, Y. ; Pelgrum, H. - \ 1998
Hydrological Processes 12 (1998)13/14. - ISSN 0885-6087 - p. 2133 - 2147.
remote sensing - landgebruik - energiebalans - china - land use - energy balance
A new methodology for assimilation of initial soil moisture fields in weather prediction models using Meteosat and NOAA data
Hurk, B.J.J.M. van den; Bastiaanssen, W.G.M. ; Pelgrum, H. ; Meijgaard, E. van - \ 1997
Journal of Applied Meteorology 36 (1997). - ISSN 0894-8763 - p. 1271 - 1283.
Area-average estimates of evaporation, wetness indicators and top soil moisture during two golden days in EFEDA.
Bastiaanssen, W.G.M. ; Pelgrum, H. ; Droogers, P. ; DeBruin, H.A.R. ; Menenti, M. - \ 1997
Agricultural and Forest Meteorology 87 (1997). - ISSN 0168-1923 - p. 119 - 137.
Aggregation of evaporative fraction by remote sensing from micro to macro scale
Bastiaanssen, W.G.M. ; Pelgrum, H. ; Wal, T. van der; Roebeling, R.A. - \ 1996
In: The use of remote sensing for land degradation and desertification monitoring in the Mediterranean basin; state of the art and future research / Hill, J., Peter, D., - p. 115 - 132.
The evaporative fraction of the surface energy balance has been favoured as a tool to describe the energy partitioning during daytime. It is shown that the evaporative fraction behaves temporally stable under heterogeneous terrain conditions in the Echival Field Experiment in Desertification-Threatened Areas (EFEDA). The evaporative fraction has been calculated by means of data retrieved from geostationary satellites using the SEBAL model. The overall attainable accuracy of the evaporative fraction changes with spatial resolution in relation to the correlation length of the land surface processes.
An intercomparison of techniques to determine the area-averaged latent heat flux from individual in situ observations: a remote sensing approach using the European Field Experiment in a Desertification-Threatened Area data
Pelgrum, H. ; Bastiaanssen, W.G.M. - \ 1996
Water Resources Research 32 (1996)9. - ISSN 0043-1397 - p. 2775 - 2786.
toepassingen - woestijnen - interacties - microklimaat - remote sensing - bodemtemperatuur - thermische bodemeigenschappen - thermische geleiding - vegetatie - aride klimaatzones - applications - deserts - interactions - microclimate - soil temperature - soil thermal properties - thermal conductivity - vegetation - arid zones
Different procedures to obtain the area-averaged latent heat flux as a weighted average of ground-based observations of latent heat flux are described. Weighting coefficients are obtained from remote sensing data. A newly developed remote sensing algorithm, SEBAL, which solves the energy budget on a pixel-by-pixel basis, was successfully applied with EFEDA data. Two other methods for retrieving weighting coefficients were tested against SEBAL. The second method combines satellite images of surface temperature, surface albedo and Normalized Difference Vegetation Index (NDVI) into an index on a pixel-by-pixel basis. The third method uses a supervised classification.
Estimation of surface resistance and Priestley & Taylor alpha-parameter at different scales.
Bastiaanssen, W.G.M. ; Pelgrum, H. ; Menenti, M. ; Feddes, R.A. - \ 1996
In: Scaling up in hydrology using remote sensing / Stewart, J.B., - p. 94 - 111.
Remote sensing parameterization of meso scale land surface evaporation.
Bastiaanssen, W.G.M. ; Menenti, M. ; Dolman, A.J. ; Feddes, R.A. ; Pelgrum, H. - \ 1996
In: Energy and water in the climate system: remote measurements / Raschke, E., - p. 401 - 429.
The importance of water - availability, pests and diseases and storage facilities for sowing strategies in southern Mozambique : a sensitivity analysis for the waterbalance and crop growth model SWETAM
Pelgrum, G.H. ; Schouwenaars, J.M. - \ 1988
Wageningen : Landbouwuniversiteit Wageningen (Mededeling / Landbouwuniversiteit, Vakgroep Cultuurtechniek 121) - 29 p.
Research on plant soil water relations and its role in understanding sowing strategies in southern Mozambique.
Schouwenaars, J.M. ; Pelgrum, R. ; Swennenhuis, J. - \ 1988
In: Proc. Int. Symp. Water management for food production, Athens. Water Resources Management 2 - p. 255 - 267.
Invloed van regenval op fysische eigenschappen van de grond
Pelgrum, A. - \ 1983
Haren : I.B. (Rapport / Instituut voor Bodemvruchtbaarheid no. 4-83) - 38
capillaire opstijging - hysterese - vocht - neerslag - regen - retentie - bodemlucht - grondmechanica - bodemfysica - zuiging - spanning - pf-curve - capillary rise - hysteresis - moisture - precipitation - rain - retention - soil air - soil mechanics - soil physics - suction - tension
Er blijkt een duidelijke samenhang te bestaan tussen de schommelingen van de gemiddelde neerslag en die van de opbrengsten en de bodemvruchtbaarheidsfaktoren pH-H2O, P-getal en K-getal (Van der Paauw, 1961). In verband hiermee werd in 1961 een werkgroep opgericht om een onderzoek in te stellen naar de relatie weer-grond-gewas. Dit onderzoek is verricht van 1961 tot en met 1973, waarvan hier de resultaten worden weergegeven
Onderzoek naar de aanwezigheid van ploegzolen in zavel- en lichte kleigronden en de invloed daarvan op de water- en luchthuishouding van het profiel
Pelgrum, A. - \ 1977
Haren : Instituut voor Bodemvruchtbaarheid (Rapport / Instituut voor Bodemvruchtbaarheid no. 10-77) - 28
permeabiliteit - ploegzolen - bodem - bodemlucht - permeability - plough pans - soil - soil air
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