Resuspension of Deposited Cohesive Sediment Beds

Mehta, Ashish J.; Partheniades, Emmanuel

doi:10.1061/9780872623736.095

Cited by 44 publications

(39 citation statements)

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“…Similar findings have been reported by other authors under laboratory experiments (e.g. Mehta and Partheniades, 1982;Kuijper et al, 1989) as well as during in situ field experiments (e.g. Amos et al, 1992a,b).…”

Section: Resultssupporting

confidence: 81%

In Situ Erosion Flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed

Houwing¹,

Rijn²

1998

Journal of Sea Research

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The strength of a cohesive sediment bed is difficult to determine and must be found experimentally from laboratory tests or through in situ field tests. A new in situ erosion instrument, the In situ Erosion Flume (ISEF), has been developed which is a circulating flow system in the vertical plane. The erosion process of sediment particles of the bed in the test section of the ISEF is related to the prevailing bed-shear stress induced by a unidirectional current. The bed-shear stress can be determined from the measured velocity profile in the test section assuming a logarithmic distribution in a vertical direction. The bed-shear stress equation has been calibrated under various conditions characterised by initiation of motion of sand and gravel particles at a flat bed where the bed-shear stresses mobilising the particles are known from the Shields curve. Three reproducibility tests were carried out under laboratory conditions. The bed consisted of kaolinite and was formed by sedimentation in still fresh water. The results of the three tests showed similar values. The erosion of a kaolinite sediment bed is more precisely determined under laboratory conditions by means of the ISEF. The results are compared with data from the literature. The ISEF is a relatively simple instrument for the determination of the strength of (cohesive) sediment beds. The results based on the ISEF measurements represent the minimum shear stress exerted at initiation of erosion of the bed, which will lead to the maximum shear strength of the top layer of the (cohesive) sediment bed.

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Section: Resultssupporting

confidence: 81%

In Situ Erosion Flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed

Houwing¹,

Rijn²

1998

Journal of Sea Research

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“…sodium). According to Mehta and Partheniades (1982), very low range of salinity values (between 2 to 10 ppt) allows the process to be completed. The flocs are in turn formed by a mixture of clay, silt, very fine sand, organic matter, water and, in some cases, even gas (McAnally & Mehta 2001, Winterwerp & van Kesteren 2004.…”

Section: Discussionmentioning

confidence: 99%

Modern sedimentary processes along the Doce river adjacent continental shelf

et al. 2015

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ABSTRACT:In areas of the continental shelf where sediment supply is greater than the sediment dispersion capacity, an extensive terrigenous deposits and consequently submerged deltas can be formed. The Eastern Brazilian shelf is characterized by the occurrence of river-feed deltas in between starving coasts. Herein, modern sedimentary processes acting along the Doce river adjacent continental shelf are investigated. The main objective was to understand the shelf sediment distribution, recognizing distinct sedimentary patterns and the major influence of river sediment discharge in the formation of shelf deposits. The study used 98 surficial samples that were analyzed for grain size, composition and bulk density. Results revealed 3 distinct sectors: south -dominated by mud fraction with a recent deposition from riverine input until 30 m deep and from this depth bioclastic sands dominate; central--north -sand-mud dominated, been recognized as a bypass zone of resuspended sediment during high energy events; and north -relict sands with high carbonate content. The modern sedimentation processes along the Doce river continental shelf is dominated by distinct sedimentary regimes, showing a strong fluvial influence associated with wave/wind-induced sediment dispersion and a carbonate regime along the outer shelf. These regimes seem to be controlled by the distance from the river mouth and bathymetric gradients. KEYWORDS:

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“…로 구분된다 (Mehta and Partheniades, 1982). 일반적인 접합 곡선의 형태는 퇴적저면(deposited, settled oder stratified bed)에서 발생하는 Type I과 균일저면(placed, uniform bed) 에서 나타나는 Type II로 구분된다.…”

Section: 점착성 퇴적물의 침식률 점착성 퇴적물의 침식현상은 퇴적깊이에 따라 두 가지 형태unclassified

Experimental Study on Erosional Behaviour of Fine-Grained Sediments

Choi¹,

Kim²

2014

Journal of Korean Society of Hazard Mitigation

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Resuspension of Deposited Cohesive Sediment Beds

Cited by 44 publications

References 1 publication

In Situ Erosion Flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed

In Situ Erosion Flume (ISEF): determination of bed-shear stress and erosion of a kaolinite bed

Modern sedimentary processes along the Doce river adjacent continental shelf

Experimental Study on Erosional Behaviour of Fine-Grained Sediments

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