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- W1762068407 abstract "Abstract Colmation refers to the retention processes that can lead to the clogging of the top layer of channel sediments and decolmation refers to the resuspension of deposited fine particles. Internal colmation, clogging of the interstices directly below the armor layer, may form a thin seal that disconnects surface water from hyporheic water by inhibiting exchange processes. The settling of particles under low flow conditions can cause external colmation. Colmated channel sediments are characterized by reduced porosity and hydraulic conductivity as well as by a consolidated texture. The term ‘depth filtration’ refers to the transport and storage of fine matrix sediments in interstitial layers. Depth filtration is of significance for the transport of colloidal and fine particulate inorganic as well as organic matter within the hyporheic interstices and into the alluvial aquifer. The role of depth filtration is assessed for the content (given in mg per liter) of matrix fine particles retained in the coarse framework sediment of a gravel‐bed river in Switzerland. Sediment samples were taken by freeze‐coring with liquid nitrogen down to 70 cm depth and by piezometers down to 150 cm depth. Seventy‐two percent of the mobile matrix fine particles were smaller than 0.1 mm and 50% were smaller than 0.03 mm. The content of fines tended to increase with depth, although higher accumulations were found at intermediate depths in sediments influenced by exfiltrating ground water. Interstitial detrital particles >90 μm showed vertical distribution patterns opposing those of total particles. These relationships revealed a differential significance of import, storage, and transport within three types of hydrological exchange zones (infiltration, horizontal advection, exfiltration) in the cross‐section of the stream." @default.
- W1762068407 created "2016-06-24" @default.
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- W1762068407 date "1999-01-01" @default.
- W1762068407 modified "2023-10-14" @default.
- W1762068407 title "Colmation and Depth Filtration within Streambeds: Retention of Particles in Hyporheic Interstices" @default.
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- W1762068407 doi "https://doi.org/10.1002/iroh.199900014" @default.
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