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Drones monitoring vegetation in watercourses
Regional water authorities usually have limited information and knowledge about the vegetation present in their watercourses. An innovative monitoring technique was developed that uses a full-spectrum camera on a drone. The technique was tested in the River Experiment Center of the South Korean Institute for Civil Engineering and Building Technology (KICT) in Andong and in two Dutch streams.
Human interventions and climate change on the West African sand river
The West African coast consists of a narrow low-lying coastal strip maintained by sediment from rivers that is transported along the coast by waves and currents: a “sand river”. Today, however, much of the fluvial sand is retained behind river dams and the flow is interrupted at several locations by jetties. The sandy coastal barrier is therefore eroding almost everywhere. The situation is already critical and it is likely to worsen in the future due to climate change. This study set up a quantitative and consistent large-scale sediment budget study using a unique numerical modelling framework for the Ivory Coast, Ghana, Togo and Benin. The numerical modelling framework was based on Delft3D and UNIBEST-CL+.
Effect of dam-gate operation on sediment flushing
A new approach has been developed to investigate different approaches to operating dam gates in the Funagira dam in Japan. This approach consists of quasi-3D-modelling coupled with the real-time control toolbox (RTC), resulting in more efficient reservoir flushing and more sediment transport to the downstream reach.
Nutrient footprint tool for coastal waters
Increased amounts of nutrients (nitrogen, phosphorus) are released into surface waters due to human activities on land. This has two negative effects. Firstly, higher levels of nutrients contribute to environmental problems due to the over-enrichment of water and sediments, especially in coastal zones. Secondly, nutrients leaching from arable land to surface water are no longer available as fertiliser for crops. The NUTPRINT project was established with the aim of visualising the impact of eutrophication in the European coastal zone in a simple way and of informing the public, water managers and stakeholders, creating support for mitigation measures.
Parallel Krylov Solver for groundwater at the national and global scales
Integrated high-resolution hydrological models are increasingly being used for the evaluation of water management in the field. Unfortunately, they require large amounts of memory and long run times. An efficient way of obtaining realistic run times and memory requirements is parallel computing, where the problem is divided between multiple processor cores. The new Parallel Krylov Solver (PKS) for the groundwater simulation code MODFLOW has been applied to the national Netherlands Hydrological Instrument (NHI) model and the global PCRaster Global Water Balance (PCR-GLOBWB) model. The Parallel Krylov Solver was developed in cooperation with the USGS, Utrecht University, Alterra and Delft University of Technology.
Operational decision support for water systems
Conventional decision-making processes often revolve around established guidelines, sometimes supported with computer simulations or black box optimisation models. RTC-Tools helps decision-makers find operational strategies that maximise financial profits and minimise expenditure. In the first step, decision-makers state and prioritise their operational objectives. Using a computer model of the water system, RTC-Tools then computes the best possible schedules in terms of those priorities for controlling pumps and turbines, sluices and weirs. The computed schedules are presented to the decision-maker in a graphical user interface such as Delft-FEWS.
Monitoring using fibre optics
Fibre optics are widely used for communication technology such as internet networks. There are numerous other applications in the geosciences, one example being measurements of parameters like temperature and strain. There are multiple advantages. Fibre-optic cables are cheap and do not wear over time. Moreover, measurements are accurate and they are not affected by electromagnetic radiation, corrosion, moisture or water. Typically, accuracies are within 0.1°C, spatial resolution ranges between 0.002 m and 2.0 m, and measurement frequencies are up to 1 Hz.
Water Information Systems to support water managers and decision-makers
Deltares is developing Water Information Systems in projects in several parts of the world. The aim of the systems is generally to validate, store and retrieve all kinds of water-related data and to provide easy access to the information. Furthermore, some of the systems are used to facilitate working with mathematical simulation models. They are configured for different users, draw on common open source and freeware components, such as PostgreSQL, PostGIS, Geoserver and FEWS, and they work with custom services like WPS. The components and services are loosely coupled and bundled as OpenEarth Water Information Systems. The systems also use common standards for data exchange like WCS, WFS and OPeNDAP.
Beperking zoutindringing met lage spuidebieten : Tsjerk Hiddessluizen en Van Harinxmakanaal
De aanslibbing van de haven van Harlingen leidt tot een aanzienlijk baggerbezwaar. De aanslibbing wordt deels veroorzaakt door het spuien van water in de haven. Dit spuien vanuit het Van Harinxmakanaal is noodzakelijk voor o.a. het tegengaan van de zoutindringing het kanaal op. Het Wetterskip en de provincie Fryslân hebben gevraagd te onderzoeken welke kansrijke maatregelen er zijn om met minder waterverbruik dan in de bestaande situatie de zoutindringing op het van Harinxmakanaal te beheersen. De bestaande situatie is geanalyseerd met behulp van een voor deze studie opgezet modelinstrumentarium, dat is gevalideerd aan de hand van metingen. Het instrumentarium is vervolgens ingezet om het effect van mogelijke maatregelen te verkennen.
Passive sampling van grondwater : een trial in peilbuizen van het provinciaal meetnet van de provincie Noord-Brabant
Op twee meetlocaties van het provinciaal grondwatermeetnet van de provincie NoordBrabant zijn op twee filterdieptes passive samplers uitgehangen. Het doel was te onderzoeken of, door de grotere gevoeligheid van deze methode, stoffen zoals gewasbeschermingsmiddelen (GBM), farmaceutische stoffen (geneesmiddelen) en antibiotica al bij lage concentraties kunnen worden aangetoond. Hiervoor is een systeem ontwikkeld om de bemonstering van grondwater met passive sampling praktisch te kunnen uitvoeren en heeft er monitoring van enkele GBM, geneesmiddelen en antibiotica plaatsgevonden.