Aggraded

Part of speech: adjective

Definitions

1. The act of increasing land elevation occurs through the accumulation of sediment and organic matter in a designated location, affecting the area's topography
2. This concept encompasses the geological process whereby materials elevate the ground level as they are deposited, transforming the landscape over time
3. The process involves raising the earth's surface through the strategic deposition of sediment and other materials, thereby altering its natural contours

Etymology: "Aggraded" is the past form of "aggrade," a geology term for the building up of a riverbed, valley floor or coastal plain as sediment settles on it over time. The verb is built from the prefix "ad-," meaning "to" or "toward," joined to "grade," which in this sense refers to a smooth, even slope or gradient. Together the parts describe a surface being brought toward a level or profile, the opposite of erosion, which wears a slope down. The "grade" in "aggrade" is the same word found in "gradient" and "gradual," which come from Latin "gradus," meaning "step." A stream grading its bed has a long, smooth profile running downhill, and aggradation raises that bed when deposition outpaces the water's ability to carry material away. Rivers aggrade after floods or when they reach flatter ground, and the same process can bury roads and fields in alluvium.

Synonyms: elevated, raised