The interplay between the resultant of the hydrodynamic forces on a falling particle and of its weight represents the physical mechanism of sediment motion in streams. Transport of sediment occurs because of interaction of fluids with loose material of confined boundaries, which create a very complex set of conditions. The loose boundaries deform due to erosion and deposition. Moreover, the cas...

Abstract Giant gravel bars are important archives of megafloods; however, determining their depositional ages requires reliable geochronometric methods. Five bars, reaching heights 150–170 m, formed in the bedrock-lined Alberton Gorge along Clark Fork River, Montana (USA), during draining Glacial Lake Missoula (GLM). We report first numerical for megaflood deposits GLM basin by successfully app...

Abstract Study of the Mesozoic succession Franz Josef Land (FJL) has shed new insights on stratigraphy and geological history neighboring portion Arctic. Based composition pebbles cobbles from Lower Jurassic conglomerates, we suggest that pre‐Mesozoic NE Barents Sea comprises Cambrian metasandstones intruded by Late Paleozoic granites overlain Carboniferous–Permian sedimentary deposits. U‐Pb ZH...

Background and aims – Despite a long research history, knowledge of Antarctic marine benthic diatoms is fragmentary. This study reports on from South Bay, Livingston Island, focusing living hard substrata, species distribution across different coastal habitats. Material methods Samples were collected tidal pools (19), intertidal cobbles (9), artificial substrata installed at various depths (10)...

In many places, sandy coastlines and their associated assets are at high risk of erosion flooding, with this increasing under climate change sea level rise. context, dynamic cobble berm revetments represent a potentially sustainable protection technique to armour beaches, reduce wave runup protect the hinterland against attack. However, behaviour performance such structures is not well understo...

A century after the first attempts of Wentworth to characterise shape cobbles, our understanding particle morphology is still expanding. plethora indices has been proposed in literature individual particles. This study aims shed light on merits and limitations currently used elongation, flatness compactness, adopting a unified classification framework. Second, new are address identified shortco...