1,721,128 research outputs found
Research Agenda Setting for the Argentinean Chaco : Biofuels, cattle breeding and sustainable development in the Chaco of Argentina = Construyendo una agenda conjunta para la investigación en el Chaco Argentino : biocombustibles, ganadero y desarrollo sostenible en el Chaco Argentina
No full textThis report is the result of a project carried out on request of the Dutch Embassy in Buenos Aires for identification of the potential developments of agricultural developments and its environmental and land use implications in the Argentinean Chaco. A joint Argentinean Dutch workshop has been held in Santiago del Estero with invited guests from various Argentinean interest groups. The workshop had the form of a SWOT analysis. The results are presented in this report.EEA Santiago del EsteroFil: Nijhof, B.S.J. Wageningen University. Alterra; HolandaFil: Prieto Garra, Daniel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Santiago del Estero; ArgentinaFil: Bindraban, P.S. Wageningen University. Plant Research International; HolandaFil: Mansfeld, M.J.M. van. Wageningen University. Alterra; HolandaFil: Jongman, R.H.G. Wageningen University. Alterra; HolandaFil: Querner, E.P. Wageningen University. Alterra; Holand
An integrated surface and groundwater flow model for the design and operation of drainage systems
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Cooperation on Water management issues, Argentina : Project in the framework of Bilateral Cooperation between Argentina and the Netherlands
Full text linkWithin the framework of Bilateral Cooperation of the Ministry of Agriculture, Nature Management and Fisheries of the Netherlands, a project will be carried out to find solutions for the water management problems in Argentina. The Pampas suffers from too much water and agriculture is hampered; the Province of Mendoza has a semi-arid climate and has too little water
Een SIMGRO-Model voor het Rijnstroomgebied: Hoe ver kun je komen met beperkte data en tijd
No full textIn Nederland staan toepassingen met SIMGRO synoniem voor complex, gedetailleerd, veel gegevens benodigd etc. Het zijn toepassingen voor een klein gebied (zoals Hupselsebeek), of redelijk groot voor Nederlandse begrippen (zoals noordwest Drentse beken). De laatste 5 jaar waren er toepassingen op geheel andere schaal, voor stroomgebieden in Brazilië, Litouwen en Argentinië. Door het gebruik van digitale gegevens en de ArcView gebruikersinterface AlterrAqua zijn zulke toepassingen goed te realiseren en geeft het de modelmaker de mogelijkheid om met de (soms beperkt) beschikbare gegevens een zo goed mogelijk model op te zette
Vaststellen maaionderhoud in waterlopen; hydrologische benadering
No full textMaaionderhoud in waterlopen is nodig om de watertransportfunctie ervan te waarborgen. Het benodigde maaionderhoud in waterlopen is vanuit hydrologisch oogpunt berekend. De belangrijkste aspecten hierbij zijn: verwachte afvoer, dimensies van de waterloop, drooglegging, stromingsweerstand, en groei van water- en oevervegetatie. Voor het berekenen van tijdstip en frequentie van onderhoud zijn de verwachte afvoeren berekend met een eendimensionaal grondwatermodel. Als de verwachte afvoer groter is dan het toelaatbare debiet, is onderhoud nodig. Het onderhoud is berekend voor twee waterlopen in Twente. De methode biedt de waterschappen de mogelijkheid om het maaibeheer te verantwoorden of te verminderen
Aquatic weed control within an integrated water management framework
No full textAquatic weed control, carried out by the water boards in the Netherlands, is required to maintain sufficient discharge capacity of the surface water system. Weed control affects the conditions of both surface water and groundwater. The physically based model MOGROW was developed to simulate the flow of water in the unsaturated zone, the saturated zone and the water courses in an integrated manner. The model was verified with field data on groundwater levels, discharges, moisture storage in the root zone and evapotranspiration in the Hupselse Beek catchment.The time and frequency of weed control during summer were determined using data on weed growth, flow resistance and discharges. This study was carried out in the Poelsbeek and Bolscherbeek catchments located in the east of the Netherlands. Weed obstruction was measured in nine water courses of these catchments. The boundary roughness coefficient κ M was calculated from field data and laboratory experiments. The κ M varied for the unobstructed part of the cross-section between 30-34 m 1/3.s -1. A numerical model was used to determine the velocity distribution in a cross-section of a water course. This calculated velocity distribution resulted also in κ M values of the same order. The minimally required weed control was estimated using the data on weed obstruction, flow resistance and estimates of expected discharges. These expected discharges for the summer period were calculated for three water table fluctuation classes, using a one-dimensional groundwater model. Comparing the expected discharges and the permissible flow rates for a water course, gives the required periods of weed control.Weed control strategies were evaluated for the Poelsbeek and Bolscherbeek area using the model MOGROW. Results of the modelling experiments are the occurrence of high surface water levels, high groundwater levels and high stream flow velocities. In a cost-benefit analysis the cost of weed control and the damage for pasture (in terms of financial losses) were considered. Seven simulation years with varying wet conditions in summer were selected. The financial loss resulting from one clearing at the end of summer, was too high for only one of these years. The multi-objective decision method ELECTRE II enabled the ecological impact to be incorporated in the evaluation. The method identified weed control strategies that are most favourable for agriculture or nature conservation
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