نتایج جستجو برای: Cobbles transport
تعداد نتایج: 273918 فیلتر نتایج به سال:
We tested the recolonization of the phytobenthic community in the tailwaters of Glen Canyon Dam following longand short-term experimentally induced desiccation. The response of Cladophora glomerata, Oscillatoria spp., miscellaneous phytobenthos species and periphyton was studied over 18 weeks using three treatments: (1) undisturbed control cobbles from the submerged zone; (2) cobbles desiccated...
Studies of sediment transport problems in mountainous rivers with steep slopes are difficult due to rapid variations in flow regimes, abrupt changes in topography, etc. Sediment transport in mountainous rivers with steep slopes is a complicated subject because bed materials in mountainous rivers are often heterogeneous and contain a wide range of bed material sizes, such as gravel, cobbles, bou...
Implications for flow resistance and sediment transport Michael P. Lamb* , Fanny Brun and Brian M. Fuller Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125 *[email protected] Key Points: 1. Direct measurements of lift and drag forces were made on cobbles in steep flume experiments with shallow, rough flow over a planar bed 2. As flows shall...
The effects of density on day-time cover preferences of juvenile (100–199 mm total length) shortfinned eels (Anguilla australis Richardson) were tested in replicate channels provided with natural (cobbles, macrophytes, woody debris) and artificial (shade, plastic pipes) cover during summer. The densities used were 10, 20, 30, 40, 50, 60, 80, 100, and 200 eels channel–1 (each channel = 2.4 m2), ...
This study deals with the transport behavior of the coarse-sediment at Masudagawa flood mitigation dam (FMD), Japan. Radio frequency identification system (RFID) was used to trace the displacement of the IC tagged particles following major flood events since June 2011. Through this, the relationship between recovery rate of the tagged particles and distribution of shear stress over the FMD bed ...
[1] Numerous loose rocks with dimensions of a few centimeters to tens of centimeters and with no obvious physical relationship to outcrop rocks have been observed along the traverse of the Mars Exploration Rover Opportunity. To date, about a dozen of these rocks have been analyzed with Opportunity’s contact instruments, providing information about elemental chemistry (Alpha Particle X‐ray Spect...
Geologic records of landslide activity o er rare glimpses into landscapes evolving under the influence of tectonics and climate. Because the deposits of individual landslides are unlikely to be preserved, landslide activity in the geologic past is often reconstructed by extrapolating from historic landslide inventories. Landslide deposits have been interpreted as palaeoclimate proxies relating ...
PURPOSE: The goal of this Coastal and Hydraulics Engineering Technical Note (CHETN) is to evaluate state-of-the-art research efforts concerning predicting sediment transport in desert ephemeral channels. The present day methods used to predict sediment transport were primarily formulated for application to perennial flow channels. Additionally, in the development of sediment transport relations...
[1] The beds of steep streams are typically composed of relatively immobile boulders and more mobile patches of gravel and cobbles. Little is known about how variability in flow and sediment flux affect the area, thickness, composition, and grain mobility of sediment patches. To better understand patch dynamics, we measured flow, sediment transport, and bed properties in two steep channels. Pat...
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