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The role of algae in fine sediment flocculation: In-situ and laboratory measurements. / Deng, Zhirui; He, Qing; Safar, Zeinab; Chassagne, Claire.

In: Marine Geology, Vol. 413, 2019, p. 71-84.

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@article{0069cf8e3c9f45ada6f6ec31047639c1,
title = "The role of algae in fine sediment flocculation: In-situ and laboratory measurements",
abstract = "The precise interactions between organic and inorganic particles in the context of flocculation is an on-going topic of research. The suspended particulate matter (SPM) found in estuaries is composed of both organic and inorganic particles with specific particle size distributions (PSD's). These PSD's are a function of the hydrodynamic conditions, suspended sediment concentration (SSC), organic matter composition, salinity and seasonal variations. A field campaign was carried out in August 2015 in the turbidity maximum zone of the Yangtze Estuary, where the SPM dynamics were recorded. The concentration of algae in the water column was indirectly measured through the chlorophyll-a concentration (CC). We show that there is a strong correlation between SSC and CC in the whole water column, for the whole tidal cycle. Additional flocculation experiments in the laboratory confirm that the largest observed flocs are predominantly organic-based, and that salinity alone could not induce the flocculation of the Yangtze mineral particles. A key parameter for the maximal floc size is the algae concentration to sediment concentration ratio. When this ratio is high, the D50 is high and vice-versa.",
keywords = "Algae, Floc size, Flocculation, Grain size distribution, Tidal variation, Yangtze Estuary",
author = "Zhirui Deng and Qing He and Zeinab Safar and Claire Chassagne",
note = "Accepted Author Manuscript",
year = "2019",
doi = "10.1016/j.margeo.2019.02.003",
language = "English",
volume = "413",
pages = "71--84",
journal = "Marine Geology",
issn = "0025-3227",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - The role of algae in fine sediment flocculation: In-situ and laboratory measurements

AU - Deng, Zhirui

AU - He, Qing

AU - Safar, Zeinab

AU - Chassagne, Claire

N1 - Accepted Author Manuscript

PY - 2019

Y1 - 2019

N2 - The precise interactions between organic and inorganic particles in the context of flocculation is an on-going topic of research. The suspended particulate matter (SPM) found in estuaries is composed of both organic and inorganic particles with specific particle size distributions (PSD's). These PSD's are a function of the hydrodynamic conditions, suspended sediment concentration (SSC), organic matter composition, salinity and seasonal variations. A field campaign was carried out in August 2015 in the turbidity maximum zone of the Yangtze Estuary, where the SPM dynamics were recorded. The concentration of algae in the water column was indirectly measured through the chlorophyll-a concentration (CC). We show that there is a strong correlation between SSC and CC in the whole water column, for the whole tidal cycle. Additional flocculation experiments in the laboratory confirm that the largest observed flocs are predominantly organic-based, and that salinity alone could not induce the flocculation of the Yangtze mineral particles. A key parameter for the maximal floc size is the algae concentration to sediment concentration ratio. When this ratio is high, the D50 is high and vice-versa.

AB - The precise interactions between organic and inorganic particles in the context of flocculation is an on-going topic of research. The suspended particulate matter (SPM) found in estuaries is composed of both organic and inorganic particles with specific particle size distributions (PSD's). These PSD's are a function of the hydrodynamic conditions, suspended sediment concentration (SSC), organic matter composition, salinity and seasonal variations. A field campaign was carried out in August 2015 in the turbidity maximum zone of the Yangtze Estuary, where the SPM dynamics were recorded. The concentration of algae in the water column was indirectly measured through the chlorophyll-a concentration (CC). We show that there is a strong correlation between SSC and CC in the whole water column, for the whole tidal cycle. Additional flocculation experiments in the laboratory confirm that the largest observed flocs are predominantly organic-based, and that salinity alone could not induce the flocculation of the Yangtze mineral particles. A key parameter for the maximal floc size is the algae concentration to sediment concentration ratio. When this ratio is high, the D50 is high and vice-versa.

KW - Algae

KW - Floc size

KW - Flocculation

KW - Grain size distribution

KW - Tidal variation

KW - Yangtze Estuary

UR - http://www.scopus.com/inward/record.url?scp=85064597366&partnerID=8YFLogxK

U2 - 10.1016/j.margeo.2019.02.003

DO - 10.1016/j.margeo.2019.02.003

M3 - Article

VL - 413

SP - 71

EP - 84

JO - Marine Geology

T2 - Marine Geology

JF - Marine Geology

SN - 0025-3227

ER -

ID: 52796293