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C O N T E N T S - Physical Land Resources - Vrije Universiteit Brussel

C O N T E N T S - Physical Land Resources - Vrije Universiteit Brussel

C O N T E N T S - Physical Land Resources - Vrije Universiteit Brussel

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nitrogen, ammonium-nitrogen and temperature, and by also comparing it to theFlemish water quality immission standards.SHRESTHA Indu MohanGroundwater Modelling of Maaswinkel Natural Reserve Area, BelgiumPromotor: F. De SmedtMaaswinkel Natural Reserve Area lies in the basin of the Meuze river in Belgium. Itconstitutes of ecologically valuable area with a complicated ecosystem. There is concernabout the influence of the Meuse river and its impact on the natural reserve. The waterlevel in the ponds situated in the natural reserve is strongly dependent on the Meuseriver and shows fluctuation of several meters during the year. The water levelfluctuation has been considered as major factor contributing to loss of biodiversity inecosystem. The research aims to study the relationship between the Meuse river waterlevel and the water level in the ponds by surface water – groundwater interaction. Forthe simulation of the groundwater system, steady state and transient state models havebeen developed by using Visual MODFLOW. The spatially distributed groundwaterrecharge input for groundwater flow simulation has been computed by the use ofWetSpass. Furthermore, MODPATH has been used to compute the three dimensionalpathlines and position of particles at specified points in time. The diffusion of waterfrom the Meuse river towards the natural reserve area has been simulated by MT3DMS.Groundwater modelling result shows that the general groundwater flow direction isfrom general head boundary towards the Meuse river as most of basin area lies outsidethe study area which is contributing 53.8% of groundwater flow towards the ponds andthe Meuse river throughout the year except during flood. During the peak floods, thewater level fluctuation on the ponds is mainly due to the Meuse river that contributes54.8% of groundwater flow towards the ponds. Finally, the impacts of groundwater levelin the natural reserve area have been analyzed in order to maintain its biodiversityconsidering different scenarios of nature and water resources management.- 24 -

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