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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Nowcasten actuele vullingsgraad bodem (met behulp van een model en remote sensing data)
Toorn, Linda ; Klutman, W.A.J. ; Hanhart-van den Brink, M. ; Heijkers, J. ; Bakel, J. van; Bastiaanssen, M. ; Spijker, Maarten ; Veldhuizen, A.A. - \ 2016
Amersfoort : Stowa (Stowa rapport 2016-20) - 57 p.
waterbeheer - waterbergend vermogen - remote sensing - wateropslag - ondergrondse opslag - grondwaterstand - water management - water holding capacity - water storage - underground storage - groundwater level
Een belangrijke opgave van de waterschappen is het voorkomen van wateroverlast en droogte. In deze studie is onderzocht of het haalbaar is om een instrument te ontwikkelen waarmee de hoeveelheid water die in de bodem kan worden geborgen, inzichtelijk kan worden gemaakt. Het gaat hierbij om een combinatie van data van satellieten (over verdamping en bodemvocht), aangevuld met data uit het veld en data van hydrologische modellen. Het zo verkregen inzicht in de ‘vullingsgraad’ van de bodem biedt veel potentie voor het operationele waterbeheer, waaronder peilbeheer. De informatie kan als inhoudelijke basis worden gebruikt om projecten als Slim Watermanagement vorm te geven.
Onderzoek Schapkwaliteit Biologische Aardappelen
Wijk, C.A.P. van; Spits, H.G. ; Pereira da Silva, F.I.D.G. ; Otma, E.C. ; Gottschall, J. ; Bastiaanssen, J. - \ 2015
Biokennis (PPO rapport 640) - 43
aardappelen - voedselgewassen - consumptieaardappelen - houdbaarheid (kwaliteit) - biologische productie - kwaliteit na de oogst - behandeling na de oogst - biologische landbouw - biologische voedingsmiddelen - potatoes - food crops - table potatoes - keeping quality - biological production - postharvest quality - postharvest treatment - organic farming - organic foods
Samenvattend verslag van: Onderzoek naar de kwaliteit van biologische aardappelen in het winkelschap, Effect van kiemremmingsproducten op het schapleven, en Effect van licht op vergroening in de retail.
An interactive water indicator assessment tool to support land use planning
Hellegers, P.J.G.J. ; Jansen, H.C. ; Bastiaanssen, W.G.M. - \ 2012
Irrigation and Drainage 61 (2012)2. - ISSN 1531-0353 - p. 143 - 154.
This paper presents an interactive web-based rapid assessment tool that generates key water related indicators to support decision making by stakeholders in land use planning. The tool is built on a consistent science based method that combines remote sensing with hydrological and socioeconomic analyses. It generates transparent, impartial, and verifiable information regarding the impact of land use changes on water productivity, water consumption, water availability, and employment. The usefulness of the tool was demonstrated in the Inkomati River Basin in Southern Africa, where the tool was used to assess the impact of converting land use on the water resources to prioritize areas for conversion and to track required changes in land use to comply with tripartite water allocation agreements. This contributed to confidence building and to strengthening the process of conscientious land use planning, which is an extension of conventional work in this field.
Calibration of a distributed irrigation water management model using remotely sensed evapotranspiration rates and groundwater heads
Jhorar, R.K. ; Smit, A.A.M.F.R. ; Bastiaanssen, W.G.M. ; Roest, C.W.J. - \ 2011
Irrigation and Drainage 60 (2011)1. - ISSN 1531-0353 - p. 57 - 69.
parameter-estimation - hydrologic-models - flow models - identification - algorithm - space
Parameters of the distributed irrigation water management model FRAME are determined by an inverse method using evapotranspiration (ET) rates estimated from the SEBAL remote sensing procedure and in situ measurement of groundwater heads. The model simulates canal and on-farm water management as well as regional groundwater flow. The calibration is achieved in two phases. The data on ET were introduced with the primary intent of improving predictions of ET through better estimated soil hydraulic parameters. During the first phase, soil hydraulic parameters sensitive to ET were optimized. As per the canal running schedule in the study area, the daily values of ET data were synthesized into 16 time periods with 15 periods each of 24 days and one period of 5 days. Use of cumulative (annual basis) ET data results in better estimates of soil hydraulic parameters as compared to temporal (24-day period basis) ET data due to possible errors in other input data. During the second phase of calibration, aquifer drainable porosity and maximum allowable groundwater extraction were optimized against groundwater heads for five years. The calibration was very successful in about 70% of the study area with a coefficient of correlation between simulated and observed groundwater levels of more than 80%. Subsequently the model is validated against groundwater heads for nine years.
Seasonal evaluation of the land surface sheme HTESSEL against remote sensing derived energy fluxes of the Transdanubian regions in Hungary
Wipfler, E.L. ; Metselaar, K. ; Dam, J.C. van; Feddes, R.A. ; Meijgaard, E. van; Ulft, L.H. van; Hurk, B. van den; Zwart, S.J. ; Bastiaanssen, W.G.M. - \ 2011
Hydrology and Earth System Sciences 15 (2011)4. - ISSN 1027-5606 - p. 1257 - 1271.
aardoppervlak - evapotranspiratie - remote sensing - klimaatverandering - modellen - hongarije - land surface - evapotranspiration - climatic change - models - hungary - terrestrial water storage - era-40 reanalysis - balance closure - climate models - field - atmosphere - hydrology - impact - basin
The skill of the land surface model HTESSEL is assessed to reproduce evaporation in response to land surface characteristics and atmospheric forcing, both being spatially variable. Evaporation estimates for the 2005 growing season are inferred from satellite observations of the Western part of Hungary and compared to model outcomes. Atmospheric forcings are obtained from a hindcast run with the Regional Climate Model RACMO2. Although HTESSEL slightly underpredicts the seasonal evaporative fraction as compared to satellite estimates, the mean, 10th and 90th percentile of this variable are of the same magnitude as the satellite observations. The initial water as stored in the soil and snow layer does not have a significant effect on the statistical properties of the evaporative fraction. However, the spatial distribution of the initial soil and snow water significantly affects the spatial distribution of the calculated evaporative fraction and the models ability to reproduce evaporation correctly in low precipitation areas in the considered region. HTESSEL performs weaker in dryer areas. In Western Hungary these areas are situated in the Danube valley, which is partly covered by irrigated cropland and which also may be affected by shallow groundwater. Incorporating (lateral) groundwater flow and irrigation, processes that are not included now, may improve HTESSELs ability to predict evaporation correctly. Evaluation of the model skills using other test areas and larger evaluation periods is needed to confirm the results.
Combining remote sensing and economic analysis to support decisions that affect water productivity
Hellegers, P.J.G.J. ; Soppe, R.W.O. ; Perry, C.J. ; Bastiaanssen, W.G.M. - \ 2009
Irrigation Science 27 (2009)3. - ISSN 0342-7188 - p. 243 - 251.
irrigated wheat - management
In this paper, an innovative method - that combines a technical and socio-economic analysis - is presented to assess the implications of policy decisions on water productivity. In the technical part, the variability in crop water productivity (CWP) is analyzed on the basis of actual water consumption and associated biomass production using the Surface Energy Balance Algorithm for Land (SEBAL). This generates input for the socio-economic analysis, which aims to quantify the foregone economic water productivity (EWP) of policy decisions to allocate water in a social optimal way. The basis for arguments to transfer water between categories of users will be strengthened and be more objective when the productivity in existing and alternative uses is known. The usefulness of such an approach is shown in the South African part of the Inkomati Basin, where according to the Water Act, water has to be reserved for basic human needs and to protect aquatic ecosystems. The opportunity costs, in terms of foregone EWP, of decisions to divert water away from agriculture are assessed. The results show that diverting water away from crops with a low CWP is not always the most cost-effective way in terms of foregone EWP. This paper is written in the framework of "A demonstration project in the Inkomati Basin" (Soppe et al. 2006) funded by the "Partners for Water II"program of the Dutch government
Analysis of energy fluxes and vegetation-atmosphere parameters in irrigated and natural ecosystems of semi-arid Brazil
Castro Teixeira, A.H. de; Bastiaanssen, W.G.M. ; Ahmad, M.D. ; Moura, M.S.B. ; Bos, M.G. - \ 2008
Journal of Hydrology 362 (2008)1-2. - ISSN 0022-1694 - p. 110 - 127.
aerodynamic roughness - water - evaporation - vineyard - surface - heat - evapotranspiration - balance - soil - canopy
Knowledge on evapotranspiration is essential in quantifying water use depletion and to allocate scarce water resources to competing uses. Despite that an extensive literature describes the theoretical mechanisms of turbulent water vapour transport above and within crop canopies fewer studies have examined land surface parameters within composite landscapes of irrigated crops and semi-arid natural vegetation. Aiming to improve parameterizations of the radiation and energy balance in irrigated crops and natural vegetation, micro-climatic measurements were carried out on irrigated land (vineyards and mango orchard) and natural vegetation (caatinga) in the semi-arid zone of the Sao Francisco River basin (Brazil) from 2002 to 2005. The fractions of 24 h incident solar radiation available for net radiation were 46%, 55%, 51% and 53%, for wine grape, table grape, mango orchard and caatinga, respectively. Daily evaporative fractions of the net available energy used as latent heat flux (lambda E) were 0.80, 0.88, 0.75 and 0.33 respectively. The daylight values of bulk surface resistances (r(s)) averaged 128 s m(-1), 73 s m(-1), 133 s m(-1) and 1940 s m(-1) for wine grape, table grape, mango orchard and caatinga, respectively. Simplified parameterizations on roughness and evaporation resistances were performed. It could be concluded that net radiation can be estimated by means of a linear expression with incident global solar radiation depending on the type of vegetation. The variability of aerodynamic resistance (r(a)) could be mainly explained by the friction velocity (u.) which on turn depends on the surface roughness length for momentum transport (z(om)). The experimental data showed that for sparse canopies z(om) being 9% of the mean vegetation height is a doable operational rule for the semi-arid region of Sao Francisco River basin. The seasonal values of r(s) for irrigated crops were highly correlated with water vapour pressure deficit. The availability of analytical methods to assess ra and rs makes the one-step Penman-Monteith equation suitable for the computation of actual evapotranspiration and water productivity analyses.
Measurements and modelling of evapotransiration to assess agricultural water productivity in basins with changing land use patterns : a case study in the São Francisco River basin, Brazil
Castro Teixeira, A.H. de - \ 2008
Wageningen University. Promotor(en): W.G.M. Bastiaanssen; M.G. Bos. - [S.l.] : S.n. - ISBN 9789085049814 - 239
evapotranspiratie - meting - modellen - stroomgebieden - landgebruik - landbouw - brazilië - evapotranspiration - measurement - models - watersheds - land use - agriculture - brazil
Uncertainty analysis for satellite derived sensible heat fluxes and scintillometer measurements over Savannah environment and comparison to mesoscale meteorological simulation results
Marx, A. ; Kunstmann, H. ; Schüttemeyer, D. ; Moene, A.F. - \ 2008
Agricultural and Forest Meteorology 148 (2008)4. - ISSN 0168-1923 - p. 656 - 667.
land-surface-temperature - large-aperture scintillometer - split-window algorithm - optical scintillation - structure parameter - refractive-index - water-vapor - model - validation - momentum
Three methods for estimating instantaneous sensible heat flux (H) over Savannah environment in West Africa were compared: first, satellite derived estimations using the Surface Energy Balance Algorithm for Land (SEBAL) method [Bastiaanssen, W.G.M., Menenti, M., Feddes, R.A., Holtslag, A.A.M., 1998a. A remote sensing energy balance algorithm for land, SEBAL: 1. Formulation. J. Hydrol. 212¿213, 198¿212]; secondly, measurements at two test sites in Ghana with a large-aperture scintillometer (LAS); third, high resolution mesoscale meteorological simulations using the MM5 (5th-Generation Penn State/NCAR) mesoscale modelling system. Satellite-derived sensible heat flux was based on seven NOAA-16 AVHRR images that were processed for a 2-week period in December 2001 (dry season) and were compared to LAS-data and MM5 simulation results. A methodology based on Gaussian Error Propagation is presented to derive uncertainties in satellite derived sensible heat flux due to (a) input data, (b) coefficients to determine leaf area index (LAI) and (c) methodological differences in estimating surface temperature T0. Total computed relative uncertainty in H was 15% for the Tamale test site and 20% for the Ejura site. Uncertainties in instantaneous evapotranspiration ¿E, however, are much smaller than uncertainties of H. This results due to the same bias in H and Rn ¿ G. For LAS-data, an uncertainty analysis due to input data was performed which showed relative uncertainty of 8% for the Tamale site and 7% for Ejura. Satellite derived net radiation (Rn) was underestimated in comparison to ground measurements which finally caused an underestimation of H. Satellite estimates of H using spatially interpolated ground based measurements of net radiation showed good agreement to LAS data. MM5-computed latent heat flux showed very low values for the entire region. This caused a serious relative MM5-overestimation of sensible heat flux in comparison to LAS and satellite derived estimates. It could be shown that Gaussian Error Propagation can serve as an essential tool to asses the reliability of satellite derived sensible heat fluxes. The resulting uncertainties give information on sensitivities in estimating H and therefore provide a tool for validation purposes.
Satellite measurements to assess and charge for groundwater abstraction
Bastiaanssen, W.G.M. ; Hellegers, P.J.G.J. - \ 2007
In: The role of technology and institutions in the costs recovery of irrigation and drainage projects Washington DC : World Bank (Agriculture and Rural Development / Discussion paper 33) - ISBN 9781402083037 - p. 38 - 60.
Crop water parameters of irrigated wine and table grapes to support water productivity analysis in the Sao Francisco river basin, Brazil
Castro Teixeira, A.H. de; Bastiaanssen, W.G.M. ; Bassoi, L.H. - \ 2007
Agricultural Water Management 94 (2007)39508. - ISSN 0378-3774 - p. 31 - 42.
thompson-seedless grapevines - energy-balance - stomatal conductance - vineyard - evapotranspiration - vines - drip - photosynthesis - transpiration - canopy
Energy and water balance parameters were measured in two commercial vineyards in the semiarid region of the São Francisco river basin, Brazil. Actual evapotranspiration (ET) was acquired with the Bowen ratio surface energy balance method. The ratio of the latent heat flux to the available energy, or evaporative fraction (EF), was 81% on average for two growing cycles in wine grape and 88% for two growing seasons in table grape. Energy partitioning in this last vineyard was higher due to microsprinkler irrigation conditions and greater soil cover promoted by the overhead horizontal trellis systems. The accumulated ET from pruning to harvest in wine grape was 438 and 517 mm for the first and second growing cycles, respectively. Table grape consumed less water than wine grape (393 and 352 mm for the first and second growing seasons, respectively) due to shorter crop stages. Beneficial transpiration (T) was 89 and 81% of total ET for wine and table grape, respectively. Brazilian semiarid climate allows 2.5 production cycles per year for vineyards. The yield was in average of 6183 kg ha¿1 for two cycles of wine grape and 11,200 kg ha¿1 for one short growing season of table grape, corresponding to a bio-physical water productivity per unit ET of 1.06 kg m¿3 (or 1.02 L wine m¿3) and 3.18 kg m¿3, respectively. Table grape showed a significantly higher economic water productivity (US$ 6.51 m¿3) than wine grape (US$ 0.93 m¿3). These values are much favorable than for staple crops.
Development of an agricultural drought assessment system : integration of agrohydrological modelling, remote sensing and geographical information
Vazifedoust, M. - \ 2007
Wageningen University. Promotor(en): Reinder Feddes, co-promotor(en): Jos van Dam; W.G.M. Bastiaanssen. - S.l. : s.n. - ISBN 9789085047971 - 148
droogte - bodemwater - beoordeling - remote sensing - geografische informatiesystemen - wiskundige modellen - landbouw met irrigatie - geïrrigeerde gronden - gewasopbrengst - simulatiemodellen - agrohydrologie - modelleren - drought - soil water - assessment - remote sensing - geographical information systems - mathematical models - irrigated farming - irrigated soils - crop yield - simulation models - agrohydrology - modeling
Iran faces widespread droughts regularly, causing large economical and social damages. The agricultural sector is with 80-90 % by far the largest user of water in Iran and is often the first sector to be affected by drought. Unfortunately, water management in agriculture is also rather poor and hence water productivity of crops WP is far below potential. The growing water scarcity due to drought and the increasing water demands of industries, households and environment, are major threats to sustainable agricultural development in Iran. Therefore, the development of a reliable agricultural drought assessment system would be very beneficial for proper operational decision making on farms, for early warning, for identification of potential vulnerability of areas and for mitigation of drought impacts. Given the current water scarcity, the limited available amount of water should be used as efficient as possible. To explore on-farm strategies which result in higher WP-values and thus economic gains, the physically based agrohydrological model Soil Water Atmosphere Plant (SWAP), was calibrated and validated using measured data at 8 selected farmer’s fields (wheat, fodder maize, sunflower and sugar beet) in the Borkhar irrigation district in Iran during the agricultural year 2004-05. Using the calibrated SWAP model, on-farm strategies i.e. deficit irrigation scheduling, optimal irrigation intervals and extent of cultivated area, were analyzed based on relations between WP- indicators and water consumption. The results showed a large potential of the improvement of water productivity under limited water supply in the Borkhar irrigation district. Although agrohydrological models like SWAP offer the possibilities for predicting crop yield, such models may become inaccurate because of uncertainty of input parameters like irrigation scheduling, soil hydraulic parameters and planting dates. This holds especially true when applying distributed modelling at regional scale. Hence to reduce the uncertainty in application of SWAP at regional scales, remotely sensed data of leaf area index and evapotranspiration were used in combination with a geographical information system. The remotely sensed data were inserted into the distributed SWAP model using data assimilation techniques i.e. sequential updating. Data of LAI were derived from Visible and Near Infrared (VNIR) spectral bands of remote sensing data with moderate to high spatial resolution. However, due to resolution limitations of existing remotely sensed data i.e. thermal bands, these data could not be used directly for routine ET estimation of individual fields. Therefore, a new disaggregation method based on linear disaggregation of ET components within each MODIS pixel, was developed and applied to the simulated MODIS data. The results of the proposed approach were further compared with two other disaggregation approaches being based on weighted ratios, as derived from dividing ET maps of high and low spatial resolution data. The biggest advantage of the proposed linear disaggregation approach was that the number of high spatial resolution images needed in this method is low, i.e. the approach can even be applied using one land cover map only. As in many regions access to high spatial resolution thermal images is currently not possible, the linear disaggregation method can still be used to assess drought impacts far in advance. Water balance components as computed by SWAP are quite sensitive to the upper boundary conditions, and hence to irrigation times and application depths. In order to know how much water has been applied, the cumulative actual ET data were therefore used in an automatic calibration mode, i.e. inverse modelling of irrigation scheduling. The ability of inverse modelling to reproduce the initial irrigation times and depth, was first investigated using forward cumulative SWAP simulated ET data based on 5, 15 and 30 days. Thereafter, the cumulative disaggregated remotely sensed ET data based on 5 days were used in the inverse modelling process. The results showed that the performance of inverse modelling is promising in identifying the irrigation time and depth of irrigation using 5 days based cumulative ET data. However, irrigation amounts, which rewet the soil profile beyond field capacity and thus cause excessive percolation, could not be detected by the applied inverse modelling approach. Also, assimilation of remotely sensed data into a distributed SWAP by automatic calibration needed a large amount of computation time, especially at regional scale. Hence, to insert the valuable information from remotely sensed land surface data into the SWAP model at regional scale, a simple updating assimilation technique was used. The SWAP model was implemented in a distributed way using the spatial distributed information of soil types, land use and water supply on a raster basis with a grid size of 250 m. In order to link spatial information data with SWAP, a coupling program was written by the author in MATLAB. This program took care of the transfer of in- and output data from one system to the other, as well as to run the model for each pixel. To have a prediction of crop yield far in advance, the sequential updating process of remotely sensed based data (LAI and/or relative evapotranspiration ET/ETp) was halted at one respectively two months before the end of the wheat growing season. During the sequential updating process known weather data were used, while for the remaining part of the growing season different scenarios were considered based on weather data of a dry, wet and normal year. A value for the optimum gain factor Kg, that performed best with respect to the observations, was selected Simulation with assimilation of both LAI and ET/ETp -data at both the regional and field scale (bias about %) was very promising in forecasting crop production one month in advance. However, longer term predictions i.e. two months in advance, resulted in a higher bias between the simulated and statistical data. It appeared that in the assimilation process LAI data have a dominant influence. Because of this dominant influence, it is suggested to repeat the assimilation process using the LAI data of the most advanced satellite i.e. IRS-P6 (ResourceSAT1&2) with higher spatial and temporal resolution. The surface water in the Borkhar irrigation canal network is provided by diversion of the water from the Zayande Rud river. Since this river is mainly fed by the snow melt from January to April, a comprehensive drought assessment system on seasonal basis can be developed by integration of the developed agricultural drought assessment system with the estimates of available surface water being derived from snow pack and snow cover.
Combining remote sensing and economic analysis to assess water productivity; A demonstration project in the Inkomati Basin
Soppe, R.W.O. ; Hellegers, P.J.G.J. ; Perry, C.J. ; Boon, D. ; Bastiaanssen, M. - \ 2006
Den Haag : LEI Wageningen UR
Assessing options to increase water productivity in irrigated river basins using remote sensing and modelling tools
Dam, J.C. van; Singh, R. ; Bessembinder, J.J.E. ; Leffelaar, P.A. ; Bastiaanssen, W.G.M. ; Jhorar, R.K. ; Kroes, J.G. ; Droogers, P. - \ 2006
International Journal of Water Resources Development 22 (2006)1. - ISSN 0790-0627 - p. 115 - 133.
crop - assimilation
In regions where water is more scarce than land, the water productivity concept (e.g. crop yield per unit of water utilized) provides a useful framework to analyse crop production increase or water savings in irrigated agriculture. Generic crop and soil models were applied at field and regional scale, together with geographical and satellite data to analyse water productivity in Sirsa District (India). In this district certain parts show a serious decline in groundwater levels and water shortage, while other parts experience a serious rise of groundwater levels, causing waterlogging and salinization. The regional analysis showed a large spatial variability of water productivity, net groundwater recharge and salinization. Scenario analysis showed that improved crop husbandry, reallocation of canal water from fresh to saline groundwater areas and reduction of seepage losses in saline groundwater areas are effective measures to increase the overall water productivity and to attain sustainable irrigation in Sirsa District.
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan
Mobin-ud-Din, A. ; Bastiaanssen, W.G.M. ; Feddes, R.A. - \ 2005
Hydrogeology Journal 13 (2005)5-6. - ISSN 1431-2174 - p. 653 - 664.
Over-exploitation of groundwater resources threatens the future of irrigated agriculture, especially in the arid and semi-arid regions of the world. In order to reverse this trend, and to ensure future food security, the achievement of sustainable groundwater use is ranking high on the agenda of water policy makers. Spatio-temporally distributed information on net groundwater use¿i.e. the difference between tubewell withdrawals for irrigation and net recharge¿is often unknown at the river basin scale. Conventionally, groundwater use is estimated from tubewell inventories or phreatic surface fluctuations. There are shortcomings related to the application of these approaches. An alternative methodology for computing the various water balance components of the unsaturated zone by using geo-information techniques is provided in this paper. With this approach, groundwater recharge will not be quantified explicitly, but is part of net groundwater use, and the spatial variation can be quantitatively described. Records of routine climatic data, canal discharges at major offtakes, phreatic surface depth fluctuations, and simplified information on soil textural properties are required as input data into this new Geographic Information System and Remote Sensing tool. The Rechna Doab region (approximately 2.97 million ha), located in the Indus basin irrigation system of Pakistan, has been used as a case study. On an annual basis, an areal average net groundwater use of 82 mm year¿1 was estimated. The current result deviates 65% from the specific yield method. The deviation from estimates using tubewell withdrawal related data is even higher
Water management, agriculture and environment: predictive tools
Vos, J.A. de - \ 2004
In: Symposium "Unsaturated zone modeling: progress, challenges an dapplications"; poster abstracts; poster abstracts. - Wageningen : Frontis - p. 44 - 44.
AlterrAqua a regional GIS based modelling system
Hendriksen, G. ; Bolt, F.J.E. van der; Dik, P.E. ; Veldhuizen, A.A. - \ 2004
In: Symposium "Unsaturated zone modeling: progress, challenges an dapplications"; poster abstracts. - Wageningen : Frontis - p. 41 - 41.
Modelling the leaching and drainage of plant protection products in the Netherlands: the geoPEARLmodel
Tiktak, A. ; Boesten, J.J.T.I. ; Linden, A.M.A. van der; Kruijne, R. - \ 2004
In: Symposium "Unsaturated zone modeling: progress, challenges an dapplications"; poster abstracts; poster abstracts. - Wageningen : Frontis - p. 31 - 31.
Vulnerability assessment of drinking water abstraction areas in the Netherlands to pesticide leaching to shallow groundwater using geoPEARL
Kruijne, R. ; Boesten, J.J.T.I. ; Linden, A.M.A. van der; Tiktak, A. - \ 2004
In: Symposium "Unsaturated zone modeling: progress, challenges an dapplications"; poster abstracts; poster abstracts. - Wageningen : Frontis - p. 28 - 28.
Progress on the study of energy and water cycle over the Tibetan Plateau area - from GMAE / Tibet to CAMP / Tibet
Ma Yaoming, ; Yao Tandong, ; Toshio Koike, ; Hirohiko Ishikawa, ; Wang Jiemin, ; Menenti, M. ; Su, Z. - \ 2004
In: Symposium "Unsaturated zone modeling: progress, challenges an dapplications"; poster abstracts; poster abstracts. - Wageningen : Frontis - p. 23 - 24.
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