Selective supply of fine sediments to a gravel-bed river that contains varying grain sizes leads riverbed fluctuations. This is due filling the between gravels and sheltering effect on flow immobile materials. When implementing sediment replenishment from dams downstream river, it important evaluate impact bed variations including biological habitats. A model representing such transport essenti...

Sand patches are one of the precursors to early stage protodunes and occur widely in both desert coastal aeolian environments. Here we show field evidence a mechanism explain initiation sand on non-erodible surfaces, such as gravels moist beaches. Changes transport dynamics, directly associated with height saltation layer variable law, observed at boundary between erodible surfaces lead deposit...

Abstract The Gangetic Plains comprise steep gravelly river channels that transition to low gradient sandy 10-40 km downstream of the mountain front. This “gravel-sand transition" is characterized by an abrupt greater-than-one-order-of-magnitude drop in both and sediment grain size, suggesting a degree long-term stability. However, stratigraphic record gravel-sand Miocene Siwalik Group demonstra...

The origin of the well-known ‘grain size gap’ within range 1–10 mm in fluvial gravels is explored a laboratory experiment to ascertain effect hydraulic sorting. A widely graded sand/gravel mixture was fed into flume containing bed composed same sediment mixture. rate feed varied but water flow remained constant throughout at that sustained size-selective bedload transport with negligible suspen...

A series of triaxial compression tests with different confining pressures were conducted for gravels, road surface milling materials, and surface–base mixtures to investigate the stress–strain relationships these three kinds materials. On basis analysis test results, strength deformation geocell-reinforced materials geocell-encased predicted compared those gravels via constitutive model geocell...

Geostatistics provides quantitative indicators to characterize the spatial distribution of soil attributes which follow the regionalized variable theory. The present study aimed at applying Geostatistics to enhance the resolution of a regional soil map at East El-Owienat area which surveyed by one profile for each four kilometers. Studied area was extracted over 71 thousand feddans where six so...