Parameters affecting fine-grained suspended sediment concentrations in a shallow micro-tidal estuary, Ho Bugt, Denmark

1986 ◽  
Vol 22 (2) ◽  
pp. 241-254 ◽  
Author(s):  
Morten Pejrup
Keyword(s):  
Suspended Sediment ◽  
Tidal Estuary ◽  
Fine Grained ◽  
Suspended Sediment Concentrations

scholarly journals The contribution of tidal currents in the sedimentation of the Strait of Avlida, Southern Evoikos Gulf (Greece)

2018 ◽  
Vol 34 (2) ◽  
pp. 731 ◽  
Author(s):  
Σ. E. ΠΟΥΛΟΣ ◽  
Π. Γ. ΔΡΑΚΟΠΟΥΛΟΣ ◽  
Σ. Ν. ΛΕΟΝΤΑΡΗΣ ◽  
Ε. ΤΣΑΠΑΚΗΣ ◽  
Ε. ΧΑΤΖΗΓΙΑΝΝΗ
Keyword(s):  
Suspended Sediment ◽  
Hydrological Regime ◽  
Tidal Currents ◽  
Coarse Grained ◽  
The South ◽  
Fine Grained ◽  
Suspended Sediment Concentrations ◽  
Historical Times ◽  
Sea Level Fluctuation ◽  
Muddy Sediments

The investigated area of Avlida (northern part of the South Evoikos Gulf), which obtained its present shape within Holocene, is characterised by shallow water depths (<12 m) and the presence of muddy sediments. The hydrological regime of the area is governed mainly by the tide (sea level fluctuation 0.25-0.4 m). The water column (in April 1998) found to be almost homogeneous with temperature and salinity to increase progressively with depth from 13.7 °C and 34.1 psu (surface) to 14.1 °C and 35.7 psu (near bed). Suspended sediment concentrations varied between 1 and 4 mg/1 with the highest values observed above the seabed (4-8 mg/I). These values of suspended sediment are relatively high when compared with other coastal areas, as that of Thermaikos Gulf (<1 mg/1). Furthermore, their presence is attributed primarily to the action of tidal currents assisted periodically by the wave activity and human interference i.e. navigation. Especially the high near bed values are associated with the near-bed activity of the tidal currents, which having usually velocities > 11 cm/s apply to the seafloor bottom shear velocities capable of causing resuspension of the surficial muddy sediments and inhibiting final deposition of the suspensates. Therefore, the fine-grained sediments are resuspended and subsequently advected by the tidal currents and eventually distributed all over the study area. Finally, the relatively coarse-grained sediments found to be more abundant at the southern part are related to the deltaic progradation within historical times of the torrential rivers Mégalo Rema and Lilantas which form the south-end part of the strait of Avlida.

scholarly journals Curvas-chave de descargas de sedimentos em suspensão no Baixo São Francisco

2020 ◽  
Vol 13 (3) ◽  
pp. 1248 ◽  
Author(s):  
Solange Cavalcanti de Melo ◽  
José Coelho de Araújo Filho ◽  
Renata Maria Caminha Mendes de Oliveira Carvalho
Keyword(s):  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Suspended Sediments ◽  
Sediment Concentration ◽  
Gradual Reduction ◽  
Sao Francisco River ◽  
Sediment Loads ◽  
São Francisco River ◽  
Historical Series ◽  
Suspended Sediment Concentrations

RESUMOO conhecimento da análise quantitativa das concentrações de sedimentos em suspensão transportados pelo rio São Francisco bem como sua relação com as vazões é de muita importância, pois pode auxiliar na identificação dos efeitos da intervenção humana e ou ocasionados pelas condições naturais da região. As regiões a jusante dos barramentos no rio São Francisco apresentam como principal consequência a regularização das vazões e a diminuição das concentrações de sedimentos. O objetivo da pesquisa foi determinar as curvas-chave de sedimentos em suspensão (CCS) nas estações fluviométricas instaladas no Baixo São Francisco (BSF) após a barragem de Xingó. Para o estabelecimento dessas curvas foram utilizados dados de vazão e concentração de sedimentos em suspensão, obtidos do sistema Hidroweb no site da Agência Nacional da Água (ANA) no período de 1999 a 2018. Foram obtidas CCS para todo o trecho do BSF as quais apresentaram bons coeficientes de determinação. Na análise dos dados também foi possível perceber que nos últimos anos, desde 2013 houve redução gradativa das vazões disponibilizadas na barragem de Xingó. Consequentemente, houve também a redução gradativa das cargas de sedimentos em suspensão geradas nas estações de Piranhas, Traipu e Propriá, ou seja, os menores valores já registrados no BSF correspondendo as menores séries históricas tanto de vazão como de sedimentos em suspensão.  Keys curves of sediment discharges in suspension in the Lower São Francisco A B S T R A C TThe knowledge of the quantitative analysis of suspended sediment concentrations carried by the São Francisco River as well as its relation with the flows is of great importance, since it can help in the identification of the effects of human intervention and/or caused by the natural conditions of the region. In the downstream regions of the São Francisco riverbanks, the main consequence was the regularization of flow rates and the reduction of sediment concentrations. The objective of the research was to determine the key curves of suspended sediments (CCS) at the fluviometric stations installed in the lower São Francisco river after Xingó dam. For the evaluation, flow data and suspended sediment concentration were used. These data were obtained from the Hidroweb system on the website of the National Water Agency (ANA) from 1999 to 2018. CCS were plotted for all stretches and presented good coefficients of determination (R2). Based on the analysis of the data it was also possible to notice that in recent years, since 2013 there has been a gradual reduction of the flows available in the Xingó dam. Consequently, there was also a gradual reduction of suspended sediment loads generated at the Piranhas, Traipu and Propriá stations, that is, the lowest values already recorded in lower São Francisco, corresponding to the lower historical series of both discharge and suspended sediments.Keywords: dam, flow, sediments 

scholarly journals Dynamics of suspended sediment load in the upper part of the Rasina River Basin in 2010

2013 ◽  
Vol 93 (4) ◽  
pp. 23-40
Author(s):  
Sanja Mustafic ◽  
Predrag Manojlovic ◽  
Predrag Kostic
Keyword(s):  
Suspended Sediment ◽  
River Basin ◽  
Sediment Load ◽  
Suspended Sediment Load ◽  
Spring Season ◽  
Autumn Season ◽  
Specific Transport ◽  
Suspended Sediment Concentrations ◽  
Load Transport

The paper treats the issue of the suspended sediment load transport in the upper part of the Rasina River Basin, upstream from the "Celije" reservoir during the year of 2010. Measurements of the suspended sediment concentrations were being done at two hydrological profiles Brus and Ravni. Total quantity of the suspended sediment load that was transported at the profile of Brus in 2010 amounted to 3,437.3 t, which gave the specific transport of 16.4 t/km2/year. At the downstream profile of Ravni, 43,165 t of the suspended sediment load was transported, that is, 95.7 t/km2/year. The basin on the whole is characterized by the existence of two seasons, which by their characteristics in the load transport represent the extreme variants. During the winter-spring season, 74-85.8 % of the total annual load was transported, ?nd during the summer-autumn season between 14.2 and 26 %.

scholarly journals The impact of tides and waves on near-surface suspended sediment concentrations in the English Channel

Oceanologia ◽  
2017 ◽  
Vol 59 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Nicolas Guillou ◽  
Aurélie Rivier ◽  
Georges Chapalain ◽  
Francis Gohin
Keyword(s):  
Suspended Sediment ◽  
English Channel ◽  
Near Surface ◽  
Suspended Sediment Concentrations ◽  
The Impact

Suspended sediment and discharge dynamics across multiple spatial and temporal scales in a glaciated alpine environment: the case of the upper Ötztal, Austria

2021 ◽  
Author(s):  
Lena Katharina Schmidt ◽  
Till Francke ◽  
Theresa Blume ◽  
Johannes Schöber ◽  
Daniel Pfurtscheller ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Temporal Dynamics ◽  
Management Strategies ◽  
Transient State ◽  
Data Availability ◽  
Spatial And Temporal Scales ◽  
Sediment Yields ◽  
Catchment Areas ◽  
Suspended Sediment Concentrations ◽  
Alpine Catchments

&lt;p&gt;High alpine areas are affected disproportionately by global warming and are thus found to be in a transient state. This causes accelerating glacial retreat, which can have severe impacts on discharge and potentially sediment dynamics. Possible effects include changes in water quantities and hydrograph timing as well as changing sediment source areas and the associated magnitude and timing of transport capacities. In turn, the resulting changes in water and sediment supplies and timing have the potential to severely impact downstream ecosystems and infrastructure.&lt;/p&gt;&lt;p&gt;An essential step towards estimating the effects of future changes and developing sustainable management strategies is to quantify the behavior in the past and present. We therefore used the excellent data availability of discharge and suspended sediment concentrations in our study area in the upper &amp;#214;tztal in Tyrol, Austria, to make such an assessment. We study discharge and suspended sediment concentrations, which have been monitored at three gauges and for a minimum of seven years in the case of the youngest gauge. The resulting nested catchment setup, with catchment sizes ranging between 98 km&amp;#178; and 785 km&amp;#178;, allows us to learn about discharge and sediment fluxes and their spatial distribution, thus allowing us to quantify the relative importance of the glaciated areas as compared to the lower-lying catchment areas. It also allows us to study the temporal dynamics, such as the seasonal timing of the peaks and their interannual differences. In turn, the nested catchments allows us to investigate the spatial variability of these temporal dynamics. &amp;#160;&lt;/p&gt;&lt;p&gt;The results confirm the high specific sediment yields for alpine catchments in the order of 10&amp;#179; t/km&amp;#178; per year and higher yields in areas with higher glacier cover as well as a very pronounced seasonality.&lt;/p&gt;

Daily suspended sediment concentrations and load variability in karst watersheds

2022 ◽  
pp. 127467
Author(s):  
Zhongcheng Wang ◽  
Chengfang Li ◽  
Zhenwei Li ◽  
Ruicheng Yuan ◽  
Dan Cao
Keyword(s):  
Suspended Sediment ◽  
Suspended Sediment Concentrations
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