Searched for: author%3A%22Viparelli%2C+Enrica%22
(1 - 11 of 11)
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Czapiga, Matthew (author), Blom, A. (author), Viparelli, Enrica (author)
conference paper 2022
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Czapiga, Matthew J. (author), Blom, A. (author), Viparelli, Enrica (author)
The Waal Branch of the Rhine River has eroded over the last 150 years following channel straightening and narrowing. In 2014–2015 a pilot project replaced existing groynes over an 11 km long reach with three longitudinal training walls (LTWs) to mitigate channel bed erosion, among other purposes. Walls are lower than the river bank and split the...
journal article 2022
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Czapiga, Matthew J. (author), Blom, A. (author), Viparelli, Enrica (author)
Engineering modifications of rivers, e.g., dams or groynes, often induce long-term riverbed erosion, which can be mitigated with sediment nourishments. Here, we consider nourishments to mitigate channel bed erosion induced by channel narrowing, as opposed to the more common application downstream of dams. Our objective is to assess and...
journal article 2022
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Czapiga, Matthew J. (author), Blom, A. (author), Viparelli, Enrica (author)
abstract 2021
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Siele, Meles (author), Blom, A. (author), Viparelli, Enrica (author)
In response to changes in the upstream controls (i.e., the water discharge, the sediment supply rate, and the calibre of the load), engineered alluvial channels adjust their bed slope and bed surface texture to establish a new equilibrium state. Here we present and discuss various causes of degradational response of engineered channels to...
journal article 2018
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Chavarrias Borras, V. (author), Blom, A. (author), Orru, C. (author), Martín-Vide, Juan Pedro (author), Viparelli, Enrica (author)
Laboratory experiments were conducted on a sand-gravel Gilbert delta to gain insight on its dynamics under varying base level. Base level rise results in intensified aggradation over the topset, as well as a decrease in topset slope and topset surface coarsening, the signals of which migrate in an upstream direction. Preferential deposition...
journal article 2018
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Blom, A. (author), Chavarrias Borras, V. (author), Ferguson, Robert I. (author), Viparelli, Enrica (author)
Downstream fining of bed sediment in alluvial rivers is usually gradual, but often an abrupt decrease in characteristic grain size occurs from about 10 to 1 mm, i.e., a gravel-sand transition (GST) or gravel front. Here we present an analytical model of GST migration that explicitly accounts for gravel and sand transport and deposition in the...
journal article 2017
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Blom, A. (author), Arkesteijn, L. (author), Chavarrias Borras, V. (author), Viparelli, Enrica (author)
journal article 2017
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Emmanouil, A. (author), Blom, A. (author), Viparelli, Enrica (author), Frings, R. (author)
Sediment management measures are  becoming increasingly popular as they are  considered sustainable from both economic  and environmental point of view. For example,  aimed at counteracting river bed degradation,  sediment nourishments have been carried out  in the German reaches of the Rhine river while  a...
abstract 2017
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Siele, Meles (author), Blom, A. (author), Frings, R. (author), Viparelli, Enrica (author)
The main objective of this research is to  improve our understanding of the relative  contribution of the causes of long-term bed  degradation in Rhine and other degrading  rivers. That is, the research is intended to  quantify past channel adjustment processes,  mainly bed degradation and bed surface  coarsening...
abstract 2017
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Blom, A. (author), Viparelli, Enrica (author), Chavarrias Borras, V. (author)
There has been quite some debate on the relative importance of particle abrasion and grain size selective transport regarding the river profile form and the associated grain size trends in a graded alluvial stream. Here we present new theoretical equations for the graded alluvial river profile that account for the effects of particle abrasion...
journal article 2016
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