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Total engineering geology approach applied to motorway construction and widening in the Netherlands - part II : pilot site tidal deposits
The total engineering geology approach is applied to a roadway pilot project in the tidal deposits of the Western Netherlands. Its benefit as compared to the conventional geotechnical site investigation is demonstrated. Combining laser scanner altimetry data that is readily available to low cost GEM-2 electromagnetic surveys, allows for the refinement of the local geological model. Small and large scale heterogeneities have been detected in this study. Their existence has been confirmed by a line of closely spaced CPTs. On the basis of laser altimetry and GEM-2 signature, the identified heterogeneities are classified. Only a limited set of heterogeneities representative of the different classes requires a further detailed investigation. Aspects of feasibility, accuracy, and cost-effectiveness have a need for further research.
Dosing of anaerobic granular sludge bioreactors with cobalt : impact of cobalt retention on methanogenic activity
Analytical and numerical analysis of tides and salinities in estuaries (part I) : tidal wave propagation in convergent estuaries
Analytical solutions of the momentum and energy equations for tidal flow are studied. The analytical solutions are compared with the results of numerical solutions and with measured data in three large-scale tidal systems. Convergence is found to be dominant in long and deep-converging channels resulting in an amplified tidal range, whereas bottom friction is generally dominant in shallow converging channels resulting in a damped tidal range.
Distributed evaluation of local sensitivity analysis (DELSA), with application to hydrologic models
Schematiseringsfactor maakt keuzes in geotechniek beter zichtbaar
Het schematiseren van de ondergrond is bij het ontwerpen van geotechnischeconstructies een belangrijk aspect. Door het Expertise NetwerkWaterveiligheid is de schematiseringsfactor geïntroduceerd, die schematiseringsonzekerhedenin rekening brengt.
Modelling sediment transport and morphodynamics of gravel-bed rivers
The effect of the 18.6-year lunar nodal cycle on regional sea-level rise estimates
Exploring pathways for sustainable water management in river deltas in a changing environment
Exploring adaptation pathways into an uncertain future can support decisionmaking in achieving sustainable water management in a changing environment. Our objective is to develop and test a method to identify such pathways by including dynamics from natural variability and the interaction between the water system and society. Present planning studies on long-term water management often use a few plausible futures for one or two projection years, ignoring the dynamic aspect of adaptation through the interaction between the water system and society. Our approach is to explore pathways using multiple realisations of transient scenarios with an Integrated Assessment Meta Model (IAMM). This paper presents the first application of the method using a hypothetical case study. The case study shows how to explore and evaluate adaptation pathways. With the pathways it is possible to identify opportunities, threats, timing and sequence of policy options, which can be used by policymakers to develop water management roadmaps into the future. By including the dynamics between the water system and society, the influence of uncertainties in both systems becomes clearer. The results show, among others, that climate variability rather than climate change appears to be important for taking decisions in water management.
Influence of surface tension on air-water flows
Effects of helical flow in one-dimensional modelling of sediment distribution at river bifurcations