Het ecohydrologisch voorspellingsmodel DEMNAT-2; technische modelbeschrijving
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Open Access
Type
Report
Language
nl
Date
1992-12-31
Research Projects
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Journal Issue
Title
Het ecohydrologisch voorspellingsmodel DEMNAT-2;
technische modelbeschrijving
Translated Title
Dose Effect Model for terrestrial Nature - DEMNAT;
technical description of DEMNAT-2
Published in
Abstract
Om inzicht te krijgen in de ecologische gevolgen van
waterbeheer en -beleid worden vaak ecohydrologische voorspellings-modellen
gebruikt. DEMNAT (Dosis Effect Model Natuur Terrestrisch) is hier een
voorbeeld van. De tweede versie van dit model (DEMNAT-2) is ontwikkeld door
het RIVM en het RIZA om inzicht te geven in de ecologische effecten van
scenario's die betrekking hebben op de toekomstige drink- en
industriewaterwinning in Nederland. Speciaal ontwikkelde rekenprogramma's
en een Geografisch Informatie Systeem (GIS) zijn gebruikt om de
veranderingen van vochtige en natte ecosystemen te berekenen. Twee
hydrologische modellen, het Landelijk Grondwater Model (LGM) en de Demand
Generator (DEMGEN), produceren bestanden met hydrologische veranderingen.
Deze veranderingen worden, samen met vegetatie en bodemgegevens, door
DEMNAT-2 gebruikt voor het uitvoeren van berekeningen. Het model DEMNAT-2
bestaat uit drie FORTRAN rekenprogramma's: PREDEM (geschikt voor de
voorbereiding van invoergegevens), EFFDEM (de effect module) en POSDEM
(geschikt voor de nabewerking van rekenresultaten). De ontwikkeling en het
gebruik van deze programma's worden toegelicht. Doel van dit rapport is de
opbouw van de rekenprogramma's en het gegevenstransport tussen de
rekenprogramma's toe te lichten. Dit rapport kan worden gebruikt als
handleiding bij de rekenprogramma's, als het in samenhang wordt gebruikt met
andere rapporten die in het kader van het onderzoek "Effecten
grondwaterwinning ten behoeve van het Beleidsplan Drink- en
Industriewatervoorziening en bijbehorend Milieu Effect Rapport" zijn
uitgebracht.
To study the impact of water management scenarios on the value and distribution of terrestrial ecosystems "eco-hydrological prediction" models are used. DEMNAT (Dose Effect Model for terrestrial NATure) is one of these models. The second version of this model (DEMNAT-2), build by the National Institute of Public Health and Environmental Protection (RIVM) and the Institute for Inland Water Management and Waste Water Treatment (RIZA), is used to analyse the impact assessment of different groundwater extraction scenarios in the Netherlands. Specially developed FORTRAN calculation programs, along with a Geographical Information System (GIS), are used to calculate the changes of wet and moist ecotopes, specific for wet and moist conditions. Water-management policy scenarios provide information for two different hydrological models. These models (National Groundwater Model for the Netherlands, LGM) and DEMandGENerator, DEMGEM) produce files with information concerning hydrological changes. These changes, along with vegetation and soil data, are used by DEMNAT-2 to carry out calculations. The model DEMNAT-2 consists of three FORTRAN calculating programs: PREDEM (the preprocessor), EFFDEM (the effect module) and POSDEM (the postprocessor). Development and application of these programs as well as their operation are described in this document. Its objective is, on the one hand, to provide insight into the structure, preparation and the flow of data in DEMNAT-2, while on the other hand it is meant to be a user's manual for DEMNAT-2, along with some of the related documents published in the context of the impact assessment study.
To study the impact of water management scenarios on the value and distribution of terrestrial ecosystems "eco-hydrological prediction" models are used. DEMNAT (Dose Effect Model for terrestrial NATure) is one of these models. The second version of this model (DEMNAT-2), build by the National Institute of Public Health and Environmental Protection (RIVM) and the Institute for Inland Water Management and Waste Water Treatment (RIZA), is used to analyse the impact assessment of different groundwater extraction scenarios in the Netherlands. Specially developed FORTRAN calculation programs, along with a Geographical Information System (GIS), are used to calculate the changes of wet and moist ecotopes, specific for wet and moist conditions. Water-management policy scenarios provide information for two different hydrological models. These models (National Groundwater Model for the Netherlands, LGM) and DEMandGENerator, DEMGEM) produce files with information concerning hydrological changes. These changes, along with vegetation and soil data, are used by DEMNAT-2 to carry out calculations. The model DEMNAT-2 consists of three FORTRAN calculating programs: PREDEM (the preprocessor), EFFDEM (the effect module) and POSDEM (the postprocessor). Development and application of these programs as well as their operation are described in this document. Its objective is, on the one hand, to provide insight into the structure, preparation and the flow of data in DEMNAT-2, while on the other hand it is meant to be a user's manual for DEMNAT-2, along with some of the related documents published in the context of the impact assessment study.
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DGM/DWL