DOI: 10.1007/s10533-014-9959-0
Scopus记录号: 2-s2.0-84900832605
论文题名: Sediment microstructure and resuspension behavior depend on each other
作者: Kleeberg A. ; Herzog C.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 119, 期: 2018-01-03 起始页码: 199
结束页码: 213
语种: 英语
英文关键词: Chlorophyll a
; Entrainment
; Fluff layer
; Iron
; Phosphorus
; Pore water
Scopus关键词: chlorophyll a
; entrainment
; erosion
; iron
; mass balance
; microstructure
; phosphorus
; porewater
; resuspension
; shear stress
; Brandenburg [Germany]
; Germany
; Langer See
英文摘要: The critical shear stress of resuspension and rates of erosion for cohesive and loosely structured sediments must be obtained by direct measurements since there is no theoretical calculation. An in situ experiment on sediment resuspension was performed in a shallow lake (Langer See, NE Germany; area = 1.27 km2, zmax = 3.8 m) in summer 2006 using a hydrodynamically calibrated erosion chamber (Ø 20 cm). Shear velocity (u*) was incrementally increased in 11 steps (0-2.19 cm s-1) to initiate resuspension events. Entrainment rates (E) of suspended particulate matter (ESPM), total P (ETP), chlorophyll a (EChl a), and soluble reactive P (ESRP) were determined by mass balance. Two subsequent critical u* (0.53 cm s-1 and 1.48 cm s-1) support the 'two-layered bed' model of a fluffy surface aggregate layer (freshly deposited phytodetritus prone to resuspension) and an underlying more consolidated biostabilised layer. Patterns in ESPM (2-106 g m-2 h-1), ETP (11-532 mg m-2 h-1), and EChl a (3-24 μg m-2 h-1) revealed a sediment surface maximum of TP and Chl a and their theoretical vertical logarithmic decrease within 4 mm sediment depth, the maximum thickness of sediment layer entrained. The advective ESRP flux (17 mg m-2 h-1) was 43 times higher than the diffusive SRP flux (0.4 mg m-2 h-1). The TP and Chl a micro-profiles suggest that cohesive sediment bed formation is a function of both settling (fluff) and consolidation (biostabilisation). Thus, sediment microstructure and resuspension behavior depend on each other. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83636
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Institute of Landscape Hydrology, Leibniz Centre for Agricultural Landscape Research, Eberswalder Straße 84, 15374 Müncheberg, Germany; Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 301, 12587 Berlin, Germany
Recommended Citation:
Kleeberg A.,Herzog C.. Sediment microstructure and resuspension behavior depend on each other[J]. Biogeochemistry,2014-01-01,119(2018-01-03)