Layer of broken rocky matter, or sediment, formed from material that has been carried in suspension by a river or stream and dropped as the velocity of the current changes. River plains and deltas are made entirely of alluvial deposits, but smaller pockets can be found in the beds of upland torrents.
Alluvial deposits can consist of a whole range of particle sizes, from boulders down through cobbles, pebbles, gravel, sand, silt, and clay. The raw materials are the rocks and soils of upland areas that are loosened by erosion and washed away by mountain streams. Much of the world's richest farmland lies on alluvial deposits. These deposits can also provide an economic source of minerals. River currents produce a sorting action, with particles of heavy material deposited first while lighter materials are washed downstream.
Hence heavy minerals such as gold and tin, present in the original rocks in small amounts, can be concentrated and deposited on stream beds in commercial quantities. Such deposits are called “placer ores”.
ETYM French alluvion, Latin alluvio, from alluere to wash against; ad + luere, equiv. to lavare, to wash. Related to Lave.
Gradual formation of new land, by recession of the sea or deposit of sediment.
Effect of water impacting on shoreline.
Impact of water on shore; flood; alluvium.
ETYM Latin, neut. of alluvius. Related to Alluvious.
Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas.
Matter deposited by river or flood.
Fine silty material deposited by a river. It is deposited along the river channel where the water's velocity is low—for example, on the inside bend of a meander. A flood plain is composed of alluvium periodically deposited by floodwater.
1. A building in which commercial banking is transacted; SYN. bank building.
2. A small, hollow object in which one keeps one's money SYN. piggybank.
3. The funds held by a gambling house or the dealer in some gambling games
4. A flight maneuver; aircraft tips laterally about its longitudinal axis (especially in turning).
5. A long ridge or pile
6. A slope in the turn of a road or track; the outside is higher than the inside in order to reduce the effects of centrifugal force; SYN. cant, camber.
7. A supply or stock held in reserve especially for future use (especially in emergencies).
8. An arrangement of similar objects in a row or in tiers
9. Sloping land (especially the slope beside a body of water)
ETYM Latin depositum, from depositus, p. p. of deponere: cf. French dépôt, Old Fren. depost. Related to Deposit, Depot.
1. The act of depositing; SYN. deposition.
2. The phenomenon of sediment or gravel accumulating; SYN. sedimentation, alluviation.
ETYM From drive; akin to LG. and Dutch drift a driving, Icel. drift snowdrift, Dan. drift, impulse, drove, herd, pasture, common, German trift pasturage, drove. Related to Drive.
1. The gradual departure from an intended course due to external influences (as a ship or plane).
2. A force that moves something along; SYN. impetus, impulsion.
3. A general tendency as of opinion; SYN. trend.
4. A process of linguistic change over a period of time.
5. General meaning or tenor; SYN. purport.
6. Something heaped up by the wind or current.
7. (Mining) A horizontal (or nearly horizontal) passageway in a mine; SYN. heading, gallery.
A change of a reading or a set point value over long periods due to several factors including change in ambient temperature, time, and line voltage.
driftage / drɪftɪdʒ /
Množina reči driftage je driftages.
The deviation (by a vessel or aircraft) from its intended course due to drifting.