Flood Proof Myanmar

The objective of this research is to make a general framework, that when run through one can find a suitable measure to make a particular area in Myanmar flood proof. Myanmar suffers from yearly floods that have a huge impact on the population. Making an area flood proof is therefore one of the objectives of the civilian government. In this...

A laboratory experiment on the evolution of a sand gravel reach under a lack of sediment supply

A flume experiment was conducted to examine the evolution of a sand-gravel reach under a lack of sediment supply. A bed composed of a bimodal sediment mixture was installed with a uniform slope and an gradual fining pattern. At the upstream end of the flume the initial bed consisted of 100% gravel, which decreased stepwise (10% steps) in...

Size stratification in a Gilbert delta due to a varying base level: Flume experiments

Mathematical analysis of the Saint-Venant-Hirano model for mixed-sediment morphodynamics

Sediment of different size are transported in rivers under the action of flow. The first and still most popular sediment continuity model able to deal with mixed sediment is the so-called active layer model proposed by Hirano (1971, 1972). In this paper, we consider the one-dimensional hydromorphodynamic model given by the Saint-Venant equations...

Comparison between experimental and numerical stratigraphy emplaced by a prograding delta

A one-dimensional model that is able to store the stratigraphy emplaced by a prograding delta is validated against experimental results. The laboratory experiment describes the migration of a Gilbert delta on a sloping basement into standing water, i.e., a condition in which the stratigraphy emplaced by the delta front is entirely stored in the...

Mathematical analysis of the Saint-Venant-Hirano model and numerical solution by path-conservative methods

Image analysis for measuring the size stratification in sand-gravel laboratory experiments

Measurements of spatial and temporal changes in the grain-size distribution of the bed surface and substrate are crucial to improving the modelling of sediment transport and associated grain-size selective processes. We present three complementary techniques to determine such variations in the grain-size distribution of the bed surface in sand...

A coupled numerical solution to the shallow water-Hirano model (abstract)

Modelling the morphodynamic evolution of rivers due to flow-driven sediment transport requires the adoption of a flow model, such as the shallow water equations, and a conservation equation for sediment mass (the Exner equation). When dealing with mixtures of grain sizes, one can account for the interaction among sediment transport, bed level...

New laboratory techniques to determine the grain size distribution of a sandgravel bed surface and substrate (abstract)

Grain size changes in a river dominated by mixed sediment are the outcome of sedimentary grain sizeselective processes. Progress in the measurement techniques that define the spatial and temporal variation in grain size is necessary to provide new insights in this field. Techniques as image analysis and acoustic methods have emerged in the last...

Laboratory experiment of a mixed-sediment Gilbert delta under varying base level (abstract)

Comparison between experimental and numerical stratigraphy emplaced by prograding bedforms with a downstream slip face (abstract)

Laboratory measurements to determine the grain size distribution of the bed surface and substrate (poster)

Image analysis techniques used to determine the grain size distribution of a sand-gravel bed surface and substrate

The effect of river dunes on the morphodynamic response to overloading

A new two-layer model for conservation of mixed sediment for bedform-dominated condi-tions is proposed. There is a need for such a new bedlayer-type sediment conservation model, as (i) the commonly applied Hirano (1971) model does not account for the effects of bedform stochastics and ver-tical sorting on bed level changes, (ii) the Ribberink...

Ultimate limit state design for linings of bored tunnels: Tübbingbemessung im Grenzzustand der Tragfähigkeit beim Schildvortrieb

According to modern design codes, such as the Eurocode 7, also Soil Retaining structures should be designed according to Ultimate Limit State analysis, see [1]. From an economic point of view, the design of the lining, i.e. the thickness and reinforcement of it, would be optimal if the loading during construction is less critical than the...

Quantification of variability in bedform geometry

We analyze the variability in bedform geometry in laboratory and field studies. Even under controlled steady flow conditions in laboratory flumes, bedforms are irregular in size, shape, and spacing, also in case of well-sorted sediment. Our purpose is to quantify the variability in bedform geometry. We use a bedform tracking tool to determine...

Different approaches to handling vertical and streamwise sorting in modeling river morphodynamics

This paper presents an assessment of the strengths and weaknesses of four sediment continuity models for nonuniform sediment by applying these models to an aggradational flume experiment that is dominated by nonuniform sediment and dunes. The author makes simulations of the flume experiment using four numerical morphodynamic model systems to...

Planform changes and overbank flow in meandering rivers: The river Allier

In this study the river migration model MIANDRAS has been applied to simulations of the planform changes of the river Allier, a tributary of the river Loire in France. The Allier is a very dynamic and natural river system with braided and meandering river sections. Two meandering reaches of the Allier, located between Varennes-sur-Allier and...