نتایج جستجو برای: erosion and sedimentation
تعداد نتایج: 16833835 فیلتر نتایج به سال:
BACKGROUND: Inland waterways provide many benefits to society but serve primarily as conduits of water and sediment. Bank erosion, channel sedimentation, and reservoir infilling remain challenges to the effective management of waterways. Reservoirs have a limited service life, associated in part with the reduced capacity caused by infilling. The USACE manages more than 600 reservoirs, many of w...
The comprehensive and systematic management of watersheds is essential for reducing the adverse environmental impacts arising from anthropogenically caused erosion and subsequent sedimentation. This paper describes a computational methodology that is designed to serve as a watershed decision support system and is capable of controlling environmental impacts of non-point source pollution resulti...
Internally oscillating cycles of cutting and filling occur naturally in many coupled geomorphic systems. As a demonstration, we have modeled stream entrenchment and backfilling where alluvial systems couple to uplifting mountain blocks. This simple model tracks bedrock stream erosion and transport of alluvium to base level. Internal oscillations arise from coupling of a kinematic wave model for...
The link between sedimentation/erosion, pore pressure evolution and slope stability is being explored using analytical and numerical modeling. This modeling is being done in collaboration with Ulisses Mello of IBM’s T.J. Watson Research Center, who is an expert in hydrologic and structural simulations. Numerical modeling is also being used to simulate the effect of turbidity current erosion and...
Marine accumulations of terrigenous sediment are widely assumed to accurately record climatic- and tectonic-controlled mountain denudation and play an important role in understanding late Cenozoic mountain uplift and global cooling. Underpinning this is the assumption that the majority of sediment eroded from hinterland orogenic belts is transported to and ultimately stored in marine basins wit...
Quaternary sea level fluctuations have greatly affected the sediment budgets of the continental shelves. Previous studies suggested that this caused a considerable increase in the net loss of shelf sediments. Since sediment accumulation and erosion are closely tied to the formation and re-oxidation of pyrite, we use a high-resolution record of sulfur isotope ratios (S / S) of marine sulfate to ...
Criteria for the incipient motion of a rigid body initially resting on a rigid surface are formulated from first principles in this work. The axiom that both body and surface are rigid allows for enormous simplification. A modified Coulomb friction model and an associated distribution of reaction forces are proposed. Incipient rotation and incipient translation are then considered as seperate c...
The process of urbanization and development in high-risk areas such as river banks has increased the vulnerability of urban communities to environmental hazards. The banks of Khoshk River in Shiraz is one of these areas. These hazards are two parts : hazards resulted from river and waterways erosion (destruction, transportation and sedimentation) and the hazards resulted from floodings over the...
Reliable sedimentation histories are difficult to obtain in sandy or anthropogenically impacted coastal systems with disturbed sediment profiles and low initial radionuclide activities. This study addresses the problem using radionuclides in sediment cores from Naples Bay estuary, Florida, USA. Non-steady sedimentation and nuclide scavenging processes are shown to limit application of tradition...
The Lesti sub-watershed area is mostly steep mountain slopes, when the rain fall it carries erosion and sediment material. This study aims to discover trend of land-use changes; measure amount rate Erosion Hazard Levels; obtain sediment-transport actual quantity based on SWAT application; scatter land critical-level; determine strategy for implementing conservation controlling rates. Level were...
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