Nutrient Exchange at Water and Sediment Interface of the Largest Brackish Water Lagoon (Chilika), South Asia

2019 ◽  
pp. 107-125
Author(s):  
Saroja Kumar Barik ◽  
Prasanta Rath ◽  
Tapan Kumar Bastia ◽  
Dibakar Behera
Keyword(s):  
South Asia ◽  
Brackish Water ◽  
Nutrient Exchange ◽  
Water And Sediment ◽  
Sediment Interface

scholarly journals Spatial–temporal variation of nitrogen and diffusion flux across the water–sediment interface at the hydro-fluctuation belt of Danjiangkou reservoir in China

2020 ◽  
Vol 20 (4) ◽  
pp. 1241-1252
Author(s):  
Han Wang ◽  
Yuping Han ◽  
Lide Pan
Keyword(s):  
Diffusion Flux ◽  
Sample Collection ◽  
Sediment Pore Water ◽  
Overlying Water ◽  
Danjiangkou Reservoir ◽  
Water And Sediment ◽  
Water Quality Deterioration ◽  
Nitrogen Contents ◽  
And Diffusion ◽  
Sediment Interface

Abstract Based on overlying water and sediment sample collection from 15 sites during July, September, November 2018 and January 2019 in the hydro-fluctuation belt of Danjiangkou reservoir China, the variation of nitrogen (N) was studied. And the concentrations of NH4+-N, NO3−-N and NO2−-N in the sediment, pore water and overlying water were determined to evaluate the diffusion flux across the water–sediment interface. The results showed that the lowest sediment N concentration was 36.54 mg/L in July, and the highest one was 145.93 mg/L in November. Spatially, the sediment N concentrations were higher in tidal soil and loam than in sandy soil. According to the diffusion fluxes of NH4+, NO3− and NO2−, sediments at all sites tend to release N to the overlying water except in the sampling month of November, when the sediment acts as a sink of NO3−. The highest release rates of NH4+-N and NO3−-N were 17.66 mg m−2·d−1 and 80.15 mg m−2·d−1, respectively, which are much higher than the release rate of NO2−-N (0.29 mg m−2·d−1). The findings indicate that hydro-fluctuation belt sediment contributes a lot to the nitrogen contents in the overlying water, and internal pollution is a main reason for the water quality deterioration and even eutrophication.

Geochemistry of surface sediments of a tropical brackish water lake in South Asia

2016 ◽  
Vol 75 (3) ◽  
Author(s):  
Nirmala K ◽  
R. Ramesh ◽  
N. K. Ambujam ◽  
K. Arumugam ◽  
S. Srinivasalu
Keyword(s):  
South Asia ◽  
Brackish Water ◽  
Surface Sediments ◽  
Water Lake ◽  
Brackish Water Lake

Monitoring sediment coverage from Distributed Temperature Sensing measurements in the Port of Rotterdam, the Netherlands

2020 ◽  
Author(s):  
Manos Pefkos ◽  
Pieter Doornenbal ◽  
Arjan Wijdeveld ◽  
Ebi Meshkati Shahmirzadi ◽  
Pauline Kruiver
Keyword(s):  
Spatial Resolution ◽  
Temperature Sensing ◽  
Water Phase ◽  
Horizontal Distance ◽  
Fibre Optic ◽  
Distributed Temperature Sensing ◽  
Fourier Amplitude ◽  
River Bank ◽  
Water And Sediment ◽  
Sediment Interface

<p>Distributed Temperature Sensing (DTS) measurements were conducted in the Port of Rotterdam as part of the INTERREG NWE SURICATES project. In the Port of Rotterdam a program is running to retain sediments in the harbor for river bank protection, and to lower the costs of transferring sediment from the port to the offshore dump locations. The aim of the DTS monitoring is to find spatial patterns in sediment deposition and erosion and thus determining the sediment balance before, during and after re-allocation. Fibre optic cables were installed in two layouts. Two fibre optic cables of lengths 1.2km and 750m were laid out flat parallel and perpendicular to the shore and they passively recorded temperature. Another cable was wrapped helically on a vertical pole condensing 150 m of length into 0.77m, increasing the spatial resolution. This cable was used for passive measurements and active heating experiments. The acquired data span the period from May to September 2019.</p><p>The active heating experiments showed that the water-sediment interface along the pole can be tracked from the difference in response between the time when the heating cable is switched on and off. The pole’s passive temperature analysis indicates that signals from the water phase exhibit high variability with time, whereas those from the sediment phase have low variability. Frequency domain analysis of the water phase shows clear peaks in the Fourier Amplitude Spectrum (FAS) at one day and half-day cycles, with the half-day cycle peak having the highest magnitude. The same peaks are present in the sediment phase’s FAS, but their magnitudes are about an order of magnitude lower.</p><p>The Fourier amplitude at frequencies corresponding to half-day periods was used for classification of the phases along the pole. The interface between water and sediment is defined as the maximum in the derivative of the Fourier amplitude with height. The interface’s height and thus the occurrence of erosion or deposition was tracked over time. The analysis shows that the sediment interface varied around 5cm over a period of 2.5 months between two dredging actions.</p><p>Representative signals from the Fourier amplitude at half-day cycles from the pole were used to derive sediment coverage over the flat passive cables. However, further research is required to establish the minimum horizontal distance over which coverage can be established.</p><p>We conclude that, by comparing the spectral properties of the temperature signal of water and sediment phases, sediment coverage over fibre optic cables can be monitored with DTS measurements. The finest time and spatial resolution over which this coverage can be found remains to be decided and can be the subject of future work.</p>

Phosphorus speciation in sediments and assessment of nutrient exchange at the water-sediment interface in a Mediterranean lagoon: Implications for management and restoration

2014 ◽  
Vol 73 ◽  
pp. 115-125 ◽  
Author(s):  
Noureddine Zaaboub ◽  
Anouar Ounis ◽  
Mohamed Amine Helali ◽  
Béchir Béjaoui ◽  
Ana Isabel Lillebø ◽  
...  
Keyword(s):  
Phosphorus Speciation ◽  
Mediterranean Lagoon ◽  
Nutrient Exchange ◽  
Sediment Interface

Distribution of geochemical fractions of phosphorus and its ecological risk in sediment cores of a largest brackish water lake, South Asia

2019 ◽  
Vol 34 (3) ◽  
pp. 251-261 ◽  
Author(s):  
Saroja Kumar Barik ◽  
Satyanarayan Bramha ◽  
Tapan Kumar Bastia ◽  
Dibakar Behera ◽  
Pratap Kumar Mohanty ◽  
...  
Keyword(s):  
South Asia ◽  
Ecological Risk ◽  
Brackish Water ◽  
Sediment Cores ◽  
Geochemical Fractions ◽  
Water Lake ◽  
Brackish Water Lake

scholarly journals Changes in mobility and solubility of the redox sensitive metals Fe, Mn and Co at the seawater-sediment interface following CO<sub>2</sub> seepage

2009 ◽  
Vol 6 (3) ◽  
pp. 5623-5659 ◽  
Author(s):  
M. V. Ardelan ◽  
E. Steinnes
Keyword(s):  
Second Phase ◽  
Total Acid ◽  
Sediment Pore Water ◽  
Overlying Water ◽  
Control Chamber ◽  
Water And Sediment ◽  
Iron Manganese ◽  
The Impact ◽  
Diffusive Gradients ◽  
Sediment Interface

Abstract. The impact of CO2 seepage on the solubility and distribution of the redox-sensitive metals iron, manganese, and cobalt in seawater and sediment pore water has been studied in experiments in laboratory-scale 0.6 m3 chambers. The mobility and solubility of Fe, Mn and Co were investigated in seawater, membrane filtered seawater, and DGT samplers deployed in water and sediment during a 26 day CO2 seepage study. During the first phase of the experiment of CO2 seepage (0–16 days), total acid-leachable (pH≈1) and "dissolved" (<0.2 μm) concentrations of Fe, Mn and Co (DFe, DMn and DCo) in the seawater increased significantly; the ratios of concentrations of DFe, DMn and DCo in the CO2 chamber to the corresponding values in the control chamber (RDFe, RDMn and RDCo) were as high as 6, 65 and 58, respectively. The second phase of experiment consisted of an additional 10 days of incubation, where the concentrations of all the metals studied still increased but at reduced rates for DMn and DCo. The highest values of RDFe, RDMn and RDCo were about 3 for all metals during this part of the experiment. DGT (diffusive gradients in thin film) labile fractions denoted FeDGT, MnDGT and CoDGT were, respectively 50, 25 and 22 times higher in the CO2 seepage chamber than in the control chamber in the first phase of the experiment. During the second phase, all DGT labile metal concentrations still increased considerably, most notably for Fe. The ratio of FeDGT in the CO2 chamber to that in the control (RDGT-Fe) was still high, about 5, in the second phase of the experiment, whereas the increase in MnDGT and CoDGT slowed down. Our results indicate that acidification following CO2 seepage enhances the mobility and solubility of Fe Mn and Co in sediment and overlying water with contribution of changing in redox conditions and seepage related re-suspension.

scholarly journals Exchange characteristics of ammonia nitrogen at the water and sediment interface during the ice-sealing period in Lake Ulansuhai

2019 ◽  
Vol 31 (1) ◽  
pp. 81-87
Author(s):  
JIANG Tao ◽  
◽  
ZHANG Sheng ◽  
ZHAO Shengnan ◽  
SHI Xiaohong ◽  
...  
Keyword(s):  
Ammonia Nitrogen ◽  
Water And Sediment ◽  
Sediment Interface

scholarly journals Changes in mobility and solubility of the redox sensitive metals Fe, Mn and Co at the seawater-sediment interface following CO<sub>2</sub> seepage

2010 ◽  
Vol 7 (2) ◽  
pp. 569-583 ◽  
Author(s):  
M. V. Ardelan ◽  
E. Steinnes
Keyword(s):  
Second Phase ◽  
Total Acid ◽  
Sediment Pore Water ◽  
Overlying Water ◽  
Control Chamber ◽  
Water And Sediment ◽  
Iron Manganese ◽  
The Impact ◽  
Diffusive Gradients ◽  
Sediment Interface

Abstract. The impact of CO2 seepage on the solubility and distribution of the redox-sensitive metals iron, manganese, and cobalt in seawater and sediment pore water has been studied in experiments in laboratory-scale 0.6 m3 chambers. The mobility and solubility of Fe, Mn and Co were investigated in seawater, membrane filtered seawater, and DGT samplers deployed in water and sediment during a 26 day CO2 seepage study. During the first phase of the experiment of CO2 seepage (0–16 days), total acid-leachable (pH 1) and "dissolved" (<0.2 μm) concentrations of Fe, Mn and Co (DFe, DMn and DCo) in the seawater increased significantly; the ratios of concentrations of DFe, DMn and DCo in the CO2 chamber to the corresponding values in the control chamber (RDFe, RDMn and RDCo) were as high as 6, 65 and 58, respectively. The second phase of experiment consisted of an additional 10 days of incubation, where the concentrations of all the metals studied still increased but at reduced rates for DMn and DCo. The highest values of RDFe, RDMn and RDCo were about 3 for all metals during this part of the experiment. DGT (diffusive gradients in thin film) labile fractions denoted FeDGT, MnDGT and CoDGT were, respectively 50, 25 and 22 times higher in the CO2 seepage chamber than in the control chamber in the first phase of the experiment. During the second phase, all DGT labile metal concentrations still increased considerably, most notably for Fe. The ratio of FeDGT in the CO2 chamber to that in the control (RDGT-Fe) was still high, about 5, in the second phase of the experiment, whereas the increase in MnDGT and CoDGT slowed down. Our results indicate that acidification following CO2 seepage enhances the mobility and solubility of Fe Mn and Co in sediment and overlying water with contribution of changing in redox conditions and seepage related re-suspension.

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