Dikes and Dunes
نویسندگان
چکیده
منابع مشابه
Modelling transverse dunes
Transverse dunes appear in regions of mainly unidirectional wind and high sand availability. A dune model is extended to two dimensional calculation of the shear stress. It is applied to simulate dynamics and morphology of transverse dunes which seem to reach lateral invariance and do not stop growing. Hence, simulations of two dimensional dune fields have been performed. Characteristic laws we...
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Booming” sand dunes have a remarkable capacity to produce sounds that are comparable with those from a stringed instrument. This phenomenon, in which sound is generated after an avalanching of sand along the slip face of a dune, has been known for centuries and occurs in at least 40 sites around the world. A spectral analysis of the sound shows a dominant frequency between 70 and 110 Hz, as wel...
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High-resolution seismic reflection has been used successfully to characterize material and investigate a variety of problems associated with earthen dams and abutments. Limitations and challenges of seismic reflection when interrogating these structures and lithologies are nontrivial and require very critical thinking. Seismic reflection has proved an effective tool for mapping confining units ...
متن کاملTransverse instability of dunes.
The simplest type of dune is the transverse one, which propagates with invariant profile orthogonally to a fixed wind direction. Here we show, by means of numerical simulations, that transverse dunes are unstable with respect to along-axis perturbations in their profile and decay on the bedrock into barchan dunes. Any forcing modulation amplifies exponentially with growth rate determined by the...
متن کاملReliability based design of flood defenses and river dikes
In this paper an example is elaborated of the design of a river dike, incorporating reliability-based models. The design is demonstrated with the help of this example, which is based on [1]. 1. PROBLEM DESCRIPTION A river dike has to be designed to protect a particular region of land. The goal is to minimize the construction cost and the expected loss, due to inundation. The total cost can be e...
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ژورنال
عنوان ژورنال: BMGN - Low Countries Historical Review
سال: 2018
ISSN: 2211-2898,0165-0505
DOI: 10.18352/bmgn-lchr.10477