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AGGRADATION

1. (Land) - Building up of land surfaces by sedimentation or deposition of mineral matter. The depositional process itself. The growth of a permafrost area.
http://courses.washington.edu/esc110a/environmentalglossary.html

2. (Streambed) - A progressive buildup or raising of the channel bed and floodplain due to sediment deposition. The geologic process by which streambeds are raised in elevation and flood plains are formed. Aggradation indicates that stream discharge and/or bed-load characteristics are changing. Opposite of degradation.
http://www.tpwd.state.tx.us/texaswater/rivers/glossaryleft.htm

3. (Streambed) - The process of building up surfaces, such as stream-beds or floodplains, by the deposition of sediment and/or colluvium. http://140.211.62.101/streamwatch/glossary.htm

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