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The zero-elevation baseline or vertical datum to which a measurement of elevation or altitude is relative, e.g. the mean sea level calculated for a given location over a given period of time. [4] See also geodetic datum. de facto segregation The spatial and social separation of populations that occurs without legal sanction. [2] de jure segregation
The water in this stream forms varying currents as it makes its way downhill. In hydrology, a current in a water body is the flow of water in any one particular direction. The current varies spatially as well as temporally, dependent upon the flow volume of water, stream gradient, and channel geometry.
1. A narrow stretch of floodplain added to the outer end and downstream side of spurs between enclosed meanders on a river. [4] 2. A type of point bar consisting of a low, narrow ridge running in line with the curve of a meander, formed when the river overflows its banks. [4] sea 1. Any large body of salt water surrounded in whole or in part by ...
Antidunes occur in supercritical flow, meaning that the Froude number is greater than 1.0 or the flow velocity exceeds the wave velocity; this is also known as upper flow regime. In antidunes, sediment is deposited on the upstream (stoss) side and eroded from the downstream (lee) side, opposite lower flow regime bedforms.
Upstream and downstream can refer to: Molecular biology. Upstream and downstream (DNA), determining relative positions on DNA; Upstream and downstream (transduction) ...
A weir on the Humber River near Raymore Park in Toronto, Ontario, Canada A weir on the Yass River, New South Wales, Australia, directly upstream from a shared pedestrian-bicycle river crossing A weir on the Tikkurilankoski rapids in Vantaa, Finland Time-lapse video of a new tilting weir being installed in the Caldicot and Wentloog Levels
Downstream may refer to: Downstream (hydrology) , the direction towards the mouth of a stream, i.e. the direction the current flows Downstream (bioprocess) , when a cell mass from an upstream process (isolated, grown and harvested) is further processed to meet purity and quality requirements
Over time, meanders migrate downstream, sometimes in such a short time as to create civil engineering challenges for local municipalities attempting to maintain stable roads and bridges. [ 1 ] [ 2 ] The degree of meandering of the channel of a river, stream, or other watercourse is measured by its sinuosity .