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Melt and collapse of buried water ice : an alternative hypothesis for the formation of chaotic terrains on Mars
A computational framework for flood risk assessment in the Netherlands
The safety of dikes in the Netherlands, located in the delta of the rivers Rhine, Meuse and Scheldt, has been the subject of debate for more than ten years. The safety (or flood risk) of a particular area may depend on the safety of other areas. This is referred to as effects of river system behaviour on flood risk (quantified as the estimated number of casualties and economic damage). A computational framework was developed to assess these effects. It consists of several components that are loosely coupled via data files and Tcl scripts to manage the individual programs and keep track of the state of the computations. The computations involved are lengthy (days or even weeks on a Linux cluster), which makes the framework currently more suitable for planning and design than for real-time operation. While the framework was constructed ad hoc, it can also be viewed more formally as a tuplespace. Realising this makes it possible to adopt the philosophy for other similar frameworks.
3D simulation of wave interaction with permeable structures
COMFLOW is a general 3D free-surface flow solver. The main objective in this paper is to extend the solver with a permeable flow model to simulate wave interaction with rubble-mound breakwaters. The extended Navier-Stokes equations for permeable flow are presented and we show the discretization of these equations as they are implemented in COMFLOW.
Field performance of scour protection around offshore monopiles
Quantifying biomediated ground improvement by ureolysis large-scale biogrout experiment
Biogrouting is a biological ground improvement method, in which microorganisms are used to induce carbonate precipitation in the subsurface in order to increase the strength and stiffness of granular soils.
Linking habitat suitability and seed dispersal models in order to the effectiveness of hydrological fen restoration strategies
A model is constructed that adresses seed dispersal in tens, in order to investigate restoration strategies.
Adapting soil properties by pore space engineering
The ability of a GCM-forced hydrological model to reproduce global discharge variability
In this study the usefulness ofGCM data for hydrological studies, with focus on discharge variability and extremes, was tested by using bias-corrected daily climate data of the 20CM3 control experiment from a selection of twelve GCMs as input to the global hydrological model PCR-GLOBWB.
Bed-load transport in obliquely dune-covered riverbeds
In rivers, dune crest patterns are not always perpendicular to the main flow direction, because deviations up to around 20 degrees have been observed. These can affect the direction of sediment transport, but the available predictors for models do not account for this effect. Therefore, laboratory tests on sediment transport over artificial dunes oblique to the flow direction were conducted. The largest effect is due to helical flow at the lee side of a dune and from flow near the reattachment point. These three-dimensional features are lumped into a preliminary predictor to account for the direction of bed-load in models for two-dimensional river morphology with depth-averaged flow. To include dynamic bed-form orientation, an additional model for bed-form orientation is proposed. These concepts require further validation with mobile-bed observations and subsequent tests with numerical simulations.
Perceived effectiveness of environmental decision support systems in participatory planning : evidence from small groups of end-users