Research Interests: Environmental Engineering, Civil Engineering, Environmental Science, Groundwater, Groundwater recharge, and 14 moreLand Use Change, Land Use, Drinking Water, Nitrate, Surface Water, Nitrogen, Travel Time, Groundwater flow, Human Activity, Water Flow, Groundwater Discharge, Hydrological Processes, Nature Reserve, and Stream Flow
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Van Ommen, H.C., Van Genuchten, M. Th., Van der Molen, W.H., Dijksma, R. and Hulshof, J., 1989. Experimental and theoretical analysis of solute transport from a diffuse source of pollution. J. Hydrol., 105: 225--251. Transport processes... more
Van Ommen, H.C., Van Genuchten, M. Th., Van der Molen, W.H., Dijksma, R. and Hulshof, J., 1989. Experimental and theoretical analysis of solute transport from a diffuse source of pollution. J. Hydrol., 105: 225--251. Transport processes governing soil and groundwater contamination by a diffuse (non-point) source were studied by means of a field ~racer experiment in the Hupselse Beek catchment
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... This extended classification was tested on other locations in Can Gio. ... For more information please read the CABI Instant Access FAQs. Buy Instant Access ». KNOWLEDGE FOR LIFE Technical Info | Links| Subject Map | Privacy Policy |... more
... This extended classification was tested on other locations in Can Gio. ... For more information please read the CABI Instant Access FAQs. Buy Instant Access ». KNOWLEDGE FOR LIFE Technical Info | Links| Subject Map | Privacy Policy | Terms and Conditions ©2011 CABI.
Research Interests: Vietnam and Case Study
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... of the MERD in Hanoi, Dr LD Tuan of the Can Gio Biosphere Reserve Management Board in Ho Chi Minh City and ... Ellison, AM, Mukherjee, BB and Karim, A.(2000) Testing patterns of zonation in mangroves: scale dependence and... more
... of the MERD in Hanoi, Dr LD Tuan of the Can Gio Biosphere Reserve Management Board in Ho Chi Minh City and ... Ellison, AM, Mukherjee, BB and Karim, A.(2000) Testing patterns of zonation in mangroves: scale dependence and environmental correlates in the Sundarbans of ...
ABSTRACT
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ABSTRACT Preferential flow paths in the subsoil can cause an accelerated movement of solutes in unsaturated-saturated transport systems. To visualize these zones of preferred flow, an iodide-coloring technique was applied to ten plots in... more
ABSTRACT Preferential flow paths in the subsoil can cause an accelerated movement of solutes in unsaturated-saturated transport systems. To visualize these zones of preferred flow, an iodide-coloring technique was applied to ten plots in a field. Results indicate the existence of a nonuniform solute front in the subsoil. However, this nonuniformity could be adequately accounted for by using the convection-dispersion equation for describing the relative amount of colored area in the system. Pore water velocities agreed well with measured volumetric water contents, while dispersivities were roughly of the same order of magnitude as those reported in the literature for field-scale experiments. Results did not agree with the accelerated movement found in a previous unsaturated-saturated flow experiment on the same field. The study indicates that the antecedent moisture regime and rainfall intensity have an important effect on the formation of preferential flow paths in a subsoil, thus showing the dynamic nature of this physical phenomenon.
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... These globally averaged distributions, with their 238 TABLE 1 Parameter estimation results for the convection dispersion equation (CDE) Sampling Number of MV observations (-) (ram) Mass balance Land use: corn 1 14 3.27 37 0.981 2 14... more
... These globally averaged distributions, with their 238 TABLE 1 Parameter estimation results for the convection dispersion equation (CDE) Sampling Number of MV observations (-) (ram) Mass balance Land use: corn 1 14 3.27 37 0.981 2 14 5.40 196 0.988 3 14 3.77 95 0.992 4 ...
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ABSTRACT
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Dedecting change in water storage from associated temporal variability in terrestrial gravity has become an important topic for hydrologists. Since the GRACE satellite mission has been launched in March 2002 the understanding of the... more
Dedecting change in water storage from associated temporal variability in terrestrial gravity has become an important topic for hydrologists. Since the GRACE satellite mission has been launched in March 2002 the understanding of the effect of hydrology on terrestrial gravity ...
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Water storage at and below the land surface has effect on the gravity field. A thorough understanding of this relation will help to filter the hydrological signal from the gravity signal, and can also enable the use of the gravity signal... more
Water storage at and below the land surface has effect on the gravity field. A thorough understanding of this relation will help to filter the hydrological signal from the gravity signal, and can also enable the use of the gravity signal for hydrological purposes. The implementation of a number of superconducting gravimeters in the framework of the Global Geodynamics Project
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... The Noor brook starts as the Sint Brigida spring at 138 m amsl, has a length of 3 km and discharges into the Voer in Belgium, which is a small tributary of the ... The historical nitrate input has been calculated for different land... more
... The Noor brook starts as the Sint Brigida spring at 138 m amsl, has a length of 3 km and discharges into the Voer in Belgium, which is a small tributary of the ... The historical nitrate input has been calculated for different land use types for the period 1950-1995 (Schot et al., 1996). ...
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The search for generalized theories to cope with the inherent spatial scale problem of hydrological prediction has been largely unsuccessful to date. The modelling of flow processes in catchments is hampered by this scale problem, and... more
The search for generalized theories to cope with the inherent spatial scale problem of hydrological prediction has been largely unsuccessful to date. The modelling of flow processes in catchments is hampered by this scale problem, and therefore results in poor predictions in the ubiquitous ungauged catchment (a catchment devoid of any streamflow measurements). Until now, observations of streamflow have been
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This is a report of the hydrogeological excursion to Slovakia, held in the period from September 8 up to September 15, 1996. This report is a compilation of the work of the participating students, parts of the excursion guide and also... more
This is a report of the hydrogeological excursion to Slovakia, held in the period from September 8 up to September 15, 1996. This report is a compilation of the work of the participating students, parts of the excursion guide and also information, provided by the Slovak excursion guides.
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Research Interests: Geology and Dairy Science
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Diep in de Achterhoek ligt een van de best bemeten en begrepen beken van de wereld. Al vijftig jaar zijn Wageningse wetenschappers en studenten hier kind aan huis.
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The Geodynamic Observatory Moxa is located 30 kilometres south of Jena, Thuringia Germany in the narrow valley of the Silberleite. A superconducting gravimeter, which measures changes in the earth’s gravit field, is located in the... more
The Geodynamic Observatory Moxa is located 30 kilometres south of Jena, Thuringia Germany in the narrow valley of the Silberleite. A superconducting gravimeter, which measures changes in the earth’s gravit field, is located in the observatory. The gravitational field is not only influenced by tectonic activity, but also by the hydrological situation in the vicinity of the gravimeter. In a Previous study, a steady state 3D-model of the area directly around the observatory was constructed. The objective of this study was to gain an understanding of water storage and water flow on the hill slopes around the observatory and to create a dynamic linear reservoir model for the hill slopes. This reservoir model is used to transform the steady state 3D-model into a transient model.
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A Bacia do Rio Paracatu e um afluente do Rio Sao Francisco com uma area total de drenagem de 45.600 km2. O Rio Paracatu e responsavel por 24% da vazao do rio Sao Francisco, com uma descarga media variando entre 200 m3/s e 1.000 m3/s. O... more
A Bacia do Rio Paracatu e um afluente do Rio Sao Francisco com uma area total de drenagem de 45.600 km2. O Rio Paracatu e responsavel por 24% da vazao do rio Sao Francisco, com uma descarga media variando entre 200 m3/s e 1.000 m3/s. O uso do solo nessa bacia e predominantemente Cerrado, cuja area diminuiu significativamente nos ultimos 30 anos. Atualmente faz-se necessario entender melhor quais serao os impactos nos recursos hidricos advindos das mudancas climaticas e no uso da terra nessa bacia. Esse artigo objetivou preparar, calibrar e validar um modelo de simulacao hidrologica para simulacao das vazoes do rio Paracatu. Para isto, utilizou-se o modelo hidrologico SWAT, que e um modelo fisico e distribuido, sendo o clima, a hidrologia, as propriedades do solo e de uso da terra seus principais componentes. Os dados de vazao da estacao de Porto Alegre, ultima estacao de medicao antes do exutorio da bacia, foram utilizados no estudo. A calibracao foi feita manualmente utilizando dad...
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O Distrito Federal (DF) e uma regiao que vem experimentando mudancas rapidas devido ao crescimento populacional e urbanizacao. A agricultura irrigada e a principal usuaria nessa regiao, apresentando demandas elevadas, principalmente... more
O Distrito Federal (DF) e uma regiao que vem experimentando mudancas rapidas devido ao crescimento populacional e urbanizacao. A agricultura irrigada e a principal usuaria nessa regiao, apresentando demandas elevadas, principalmente durante a estacao seca, quando a demanda de todos os setores aumenta. Assim, e importante compreender melhor a hidrologia da regiao para propor estrategias de mitigacao e adaptacao. O objetivo deste estudo foi desenvolver, calibrar e validar um modelo de simulacao hidrologica para o alto rio Preto. Para isto, utilizou-se o modelo hidrologico SWAT. O rio Preto e um importante tributario do Paracatu, que, por sua vez, e o principal afluente do Sao Francisco. O alto rio Preto, modelado nesse estudo, tem uma area de drenagem de aproximadamente 3.300 km2 e possui uma vazao media variando entre 50 m3/s e 200 m3/s. O modelo foi calibrado e validado utilizando dados diarios de vazao da estacao Fazenda Limeira para o periodo de 1986 a 1984. O modelo apresentou um...
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Summary Water flow and water storage in hill slopes have a strong interest in the hydrological scientific community. The use of the gravimetrical signal of superconducting gravimeters can help to understand water flow in such areas. At... more
Summary Water flow and water storage in hill slopes have a strong interest in the hydrological scientific community. The use of the gravimetrical signal of superconducting gravimeters can help to understand water flow in such areas. At the Geodynamic Observatory Moxa of the Friedrich Schiller University Jena (Germany), the relation between hill slope hydrological processes and gravity residuals are investigated. For this purpose a linear reservoir model was developed to quantify canopy storage and storage changes in the unsaturated zone. A groundwater flow model (MODFLOW) was developed to quantify flow in fractured shales. Cross correlation showed significant gravimetrical response on heavy precipitation events after a dry period. The groundwater model simulated the expected flow patterns reasonably well.
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Mangrove restoration projects, aimed at restoring important values of mangrove forests after degradation, often fail because hydrological conditions are disregarded. We present a simple, but robust methodology to determine hydrological... more
Mangrove restoration projects, aimed at restoring important values of mangrove forests after degradation, often fail because hydrological conditions are disregarded. We present a simple, but robust methodology to determine hydrological suitability for mangrove species, which can guide restoration practice. In 15 natural and 8 disturbed sites (i.e. disused shrimp ponds) in three case study regions in south-east Asia, water levels were measured and vegetation composition was determined. Using an existing hydrological classification for mangroves, sites were classified into hydrological classes, based on duration of inundation, and vegetation classes, based on occurrence of mangrove species. For the natural sites hydrological and vegetation classes were similar, showing clear distribution of mangrove species from wet to dry sites. Application of the classification to disturbed sites showed that in some locations hydrological conditions had been restored enough for mangrove vegetation t...
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mg·l -1 NO3. The biggest and therefore most important spring (Sint Brigida spring) in the catchment shows an increase from 40 mg·l -1 in the early eighties up to 85 mg·l -1 NO3 at present. The discharge of the major springs and the brook... more
mg·l -1 NO3. The biggest and therefore most important spring (Sint Brigida spring) in the catchment shows an increase from 40 mg·l -1 in the early eighties up to 85 mg·l -1 NO3 at present. The discharge of the major springs and the brook are measured continuously. In order to relate the NO3 loads to the N-input, it is important to know the size of the catchment. Common practice by determining the catchment boundary in areas with deep groundwater tables, is the assumption that the hydrological boundary and topographical boundary will coincide. In the Noor catchment, with little information on groundwater heads near the assumed catchment boundaries, this assumption led to a catchment of approximately 1056 ha. By constructing a simple steady state model of the area, with as little assumptions as possible, the catchment boundary and catchment size was calculated. Methods The Noor is a small tributary of the river Meuse, located in the south-east of the Netherlands and north-east of Belg...