نتایج جستجو برای: bedform
تعداد نتایج: 222 فیلتر نتایج به سال:
The interaction of supercritical turbulent flows with granular sediment beds is challenging to study both experimentally and numerically; this task has hampered the advances in understanding antidunes, most characteristic bedform flows. This article presents first numerical attempt simulate upstream-migrating antidunes geometrically resolved particles a liquid-gas interface. Our simulations pro...
Streams and rivers play an important role in the global carbon cycle. The origins of CO2 streams are often poorly constrained or neglected, which is especially true for originating from heterotrophic metabolism streambeds. We hypothesized that sediment movement will have a direct effect on stream metabolism, thus, aim this study was to quantify moving bedforms production sandy conducted flume e...
A series of pyroclastic density currents were generated at Tungurahua volcano (Ecuador) during a period of heightened activity in August 2006. Dense pyroclastic flows were confined to valleys of the drainage network, while dilute pyroclastic density currents overflowed on interfluves where they deposited isolated bodies comprising dune bedforms of cross-stratified ash exposed on the surface. He...
The Mars Science Laboratory Curiosity rover performed coordinated measurements to examine the textures and compositions of aeolian sands in the active Bagnold dune field. The Bagnold sands are rounded to subrounded, very fine to medium sized (~45-500 μm) with ≥6 distinct grain colors. In contrast to sands examined by Curiosity in a dust-covered, inactive bedform called Rocknest and soils at oth...
The seafloor is increasingly being used for siting renewable energy and telecommunication infrastructure as well supporting key fisheries biodiversity. Understanding seabed stability sediment dynamics is, therefore, a fundamental need offshore engineering geoscience biological studies. In this study we aim to quantify the levels of mobility in Irish Sea: an area increasing socio-economic intere...
Abstract. In the field of geomorphological mapping, demand for automated delineation bedforms is growing due to increasing availability Digital Elevation Models (DEMs) in small medium resolutions. This technique not commonly applied submarine DEMs, where bedform morphology often subdued erosion and part-burial. Here we analyse drumlins both terrestrial environments compare contrast set rules ne...
We describe the first detailed reach-scale study of an incisional till-bed river. Our analysis focusses on boundary till characteristics, bare patch features, annual erosion rates, bedform dimensions and spacing, grain size distributions bedforms. Results show that exposures constitute a relatively small portion bed rates are high compared to bedrock rivers, although highly variable between pat...
The development planning of a tidally-influenced fluvial zone poses complex interaction between river discharge and its effect on the tidal patterns, especially in dense population high economic activity like Palembang located South Sumatra Indonesia. Previous studies numerical modelling this area have focused flood; however, hydrodynamic described is not more detail. present study aims to bett...
The effect of bedforms on frictional roughness felt by the overlying flow is crucial to regional modelling estuaries and coastal seas. Bedforms are also a key marker palaeoenvironments. Experiments have shown that even modest biotic abiotic cohesion in sand inhibits bedform formation, modifies size, slows development, but this has rarely been tested nature. This study used comprehensive dataset...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید