Hydrogeological Modelling of the Esperance Drinking Water Aquifer Subjected to Seawater Intrusion

Saltwater intrusion in groundwater is a concern in many aquifers around the world. It results in deterioration of potable and irrigation water quality and degradation of ecosystems. The problem is exacerbated by fresh groundwater abstraction, drying climates and a rising seawater level.<br/>Esperance is a small town situated on the south coast...

Simulation of Groundwater Flow Dynamics under Different Stresses Using MODFLOW in Rechna Doab, Pakistan

Groundwater is a primary source of freshwater provisions all around the world. Due to its limited availability, water has become a precious entity nowadays. The future accessibility of groundwater is endangered due to its massive exploitation, particularly in the irrigation sector. Therefore, the current study was conducted to assess the...

Van Hondsbossche dijk naar Hondsbossche duinen: Een modelstudie naar de effecten van een zandsuppletie op het grondwater regime

In the winter of 2014 upon 2015 the Hondsbossche dike, between Petten and Camperduin in the Netherlands, has been transformed into a dune area through sand replenishment at the seaside of the dike. The area inland has been appointed as a Natura-2000 area because of the highly appreciated ecological value. A reduction of saltwater seepage would...

Seawater Intrusion Modeling with Single Density Codes

Seawater intrusion modeling is challenging either because of a lack of many approaches' ability to cope with complex environments or significant computational expense. Seawater intrusion models also face issues with parameterization and validation due to problems with many parameters and also a lack of observational data. Bakker and Schaars ...

An Evaluation of the In-Situ Hydraulic Conductivity of Cement-Bentonite Walls

Cement-Bentonite (CB) walls are low permeability vertical cut-off barriers that are mainly used to prevent groundwater flow and isolate contaminated areas. The hydraulic performance of the CB walls depends on the flow rate (discharge) through the wall. Therefore, the walls must achieve very low hydraulic conductivity. Poor...

Meeting agricultural and environmental water demand in endorheic irrigated river basins: A simulation-optimization approach applied to the Urmia Lake basin in Iran

Competition for water between agriculture and the environment is a growing problem in irrigated regions across the globe, especially in endorheic basins with downstream freshwater lakes impacted by upstream irrigation withdrawals. This study presents and applies a novel simulation-optimization (SO) approach for identifying water management...

Modelling the phreatic surface in regional flood defences

The phreatic surface is an important factor of influence on the stability and therefore the safety of regional flood defences. For stability calculations usually a schematisation of the phreatic surface is used, based on the geometry of the flood defence and the water levels. The influence of precipitation and evapotranspiration is not...

A coupled simulation architecture for agent-based/geohydrological modelling with NetLogo and MODFLOW

The modelling of social-ecological systems can provide useful insights into the interaction of social and environmental processes. However, quantitative social-ecological models should acknowledge the complexity and uncertainty of both underlying subsystems. For example, the agent-based models which are increasingly popular for groundwater...

A WEAP-MODFLOW surface water-groundwater model for the irrigated Miyandoab plain, Urmia lake basin, Iran: Multi-objective calibration and quantification of historical drought impacts

This study develops and applies the first coupled surface water-groundwater (SW-GW) flow model for the irrigated Miyandoab plain located in the Urmia basin, in the northwest of Iran. The model is implemented using a dynamic coupling between MODFLOW and WEAP and consists of spatially distributed monthly water balances for the aquifer, root-zone,...

Application of MODFLOW with boundary conditions analyses based on limited available observations: A case study of Birjand plain in East Iran

Increasing water demands, especially in arid and semi-arid regions, continuously exacerbate groundwater resources as the only reliable water resources in these regions. Groundwater numerical modeling can be considered as an effective tool for sustainable management of limited available groundwater. This study aims to model the Birjand aquifer...

The Pipingontspanner: Feasibility of a piping measure based on relief wells

The Dutch flood defences are subjected to the new Dutch safety assessment program (WBI 2017) that incorporates the latest insights and safety regulations. As a consequence of the updated piping assessment model, studies are expected to identify more piping prone areas in the Netherlands, which makes it worthwhile to investigate alternative...

Aquifer Storage & Recovery (ASR) system improvement in northern Ghana

The northern Ghana climatological conditions are favourable for agricultural production. The annual average precipitation of 800-1250 mm/y is theoretically sufficient for farmers to be year-round self-sufficient. However, the majority of precipitation falls in a 4-month wet season spanning from late May to October. As a consequence, the region...

Assessment of the effect of groundwater flow on the performance of Borehole Thermal Energy Storage systems

In a Borehole Thermal Energy Storage (BTES) system, heat is extracted from or injected to the subsurface, taking advantage of the relatively constant temperatures of the underground. Both thermal conduction and advection can influence the performance of BTES systems, but thermal advection is often neglected in the design process. However, in...

Groundwater and solute transport modelling study Vosdonk Noord at Etten-Leur: Examining the effect of two implementation methodologies for highly heterogenic shallow subsurface characteristics

The industrial site of Vosdonk Noord at Etten-Leur in the Netherlands consists of a large soil contamination in combination with highly heterogenic shallow subsurface soil characteristics. In this report, we study the groundwater flow and solute transport behaviour at this project location. Throughout this process, knowledge is gathered about...

Effect van variaties in chloride concentratie op de efficiency van een warmte- en koudeopslag systeem

This research is executed to study the effects of density driven currents and their effects on Aquifer Thermal Energy Storage Systems(ATES).<br/><br/>A monowell system is studied in the location of Amsterdam, in the Netherlands. Due to saline water deep in the ground and fresh water higher in the ground, there is a gradient in density in the...

Groundwater modelling of the khettara area of Fezna-Jorf-Hannabou, Morocco

This master thesis comprehends a study on khettaras, historical subsurface drainage tunnels, in East Morocco. A numerical groundwater model was set up to simulate these systems and to get a better understanding of their behaviour. Subsequently, the model was used to simulate the effect of several scenarios: increased use of pumped wells in the...

Grondwatereffecten aan de oppervlakte (gebracht): Onderzoek naar effecten van stopzetting grondwaterontrekking DSM Delft - Technisch rapport

Deze rapportage bevat de beschrijving van de afzonderlijke modellen en is om die reden opgebouwd uit 5 delen. Deel I beschrijft de totstandkoming van de geo(hydro)logie van de ondergrond. Daarbij wordt onderscheid gemaakt tussen Pleistoceen en Holoceen waarbij het Holoceen zowel regionaal als ook in meer detail lokaal is gemodelleerd. Het...

Gekoppeld Modflow-Sobek waterstromen-model toegepast op waterwinning Wierden

In dit project is een koppeling ontwikkeld en getest tussen Modflow en Sobek. De ontwikkelde koppeling is een zogenaamde ‘expliciete’ koppeling. Per tijdstap worden fluxen en waterhoogten uitgewisseld tussen het grondwater- en oppervlaktewatermodel. Het gekoppelde model is toegepast op het gebied rond pompstation Wierden (Overijssel). Het...