Role of wetlands in reducing phosphorus loading to surface water in eight watersheds in the Lake Champlain Basin

1996 ◽  
Vol 20 (5) ◽  
pp. 731-739 ◽  
Author(s):  
Christine M. Weller ◽  
Mary C. Watzin ◽  
Deane Wang
Keyword(s):  
Surface Water ◽  
Phosphorus Loading ◽  
Lake Champlain

Role of Internal Phosphorus Loading in Two Shallow, Productive Lakes in Alberta, Canada

1984 ◽  
Vol 41 (6) ◽  
pp. 845-855 ◽  
Author(s):  
E. T. Riley ◽  
E. E. Prepas
Keyword(s):  
Surface Water ◽  
Deep Water ◽  
Laboratory Experiments ◽  
Water Exchange ◽  
Sediment Cores ◽  
Internal Loading ◽  
Phosphorus Loading ◽  
Quantitative Estimates ◽  
Internal Phosphorus Loading

The contribution of internal loading from the sediments to the total phosphorus (TP) budget and to the [TP] in the surface water was investigated from May to November in Nakamun and Halfmoon lakes, Alberta. During the summer, Nakamun Lake was intermittently stratified and Halfmoon Lake was weakly, thermally stratified. During the stratified periods, water overlying the sediments was anoxic, TP levels increased in the deep water, and sediments were the main source of TP, contributing 1468 and 147 kg of TP to Nakamun and Halfmoon lakes, respectively. During these same periods, internal loading to Nakamun and Halfmoon lakes (12.7 and 15.6 mg∙m−2∙d−1, respectively) were slightly higher than the rates predicted from laboratory experiments on sediment cores (9.7 and 7.2 mg∙m−2∙d−1, respectively). Quantitative estimates of vertical water exchange in Nakamun Lake and in-lake TP budgets for both lakes indicated that phosphorus released from the sediments was transported to the surface water during mixing. After eight of the nine mixing events that immediatley followed stratified periods, [TP] increased 3–43% and 31–52% in the surf ace water of Nakamun and Halfmoon lakes, respectively.

Biofouling by ultra-low pressure filtration of surface water: The paramount role of initial available biopolymers

2021 ◽  
Vol 640 ◽  
pp. 119740
Author(s):  
Li Zhang ◽  
Nigel Graham ◽  
Nicolas Derlon ◽  
Youneng Tang ◽  
Muhammad Saboor Siddique ◽  
...  
Keyword(s):  
Surface Water ◽  
Low Pressure ◽  
Pressure Filtration

Effects of Fe addition on sediment P dynamics in a eutrophic lake

2021 ◽  
Author(s):  
Melanie Münch ◽  
Rianne van Kaam ◽  
Karel As ◽  
Stefan Peiffer ◽  
Gerard ter Heerdt ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Surface Water ◽  
Water Column ◽  
Sediment Cores ◽  
Surface Water Quality ◽  
Water Interface ◽  
Eutrophic Lakes ◽  
Fe Addition

<p>The decline of surface water quality due to excess phosphorus (P) input is a global problem of increasing urgency. Finding sustainable measures to restore the surface water quality of eutrophic lakes with respect to P, other than by decreasing P inputs, remains a challenge. The addition of iron (Fe) salts has been shown to be effective in removing dissolved phosphate from the water column of eutrophic lakes. However, the resulting changes in biogeochemical processes in sediments as well as the long-term effects of Fe additions on P dynamics in both sediments and the water column are not well understood.</p><p>In this study, we assess the impact of past Fe additions on the sediment P biogeochemistry of Lake Terra Nova, a well-mixed shallow peat lake in the Netherlands. The Fe-treatment in 2010 efficiently reduced P release from the sediments to the surface waters for 6 years. Since then, the internal sediment P source in the lake has been increasing again with a growing trend over the years.</p><p>In 2020, we sampled sediments at three locations in Terra Nova, of which one received two times more Fe during treatment than the other two. Sediment cores from all sites were sectioned under oxygen-free conditions. Both the porewaters and sediments were analysed for their chemical composition, with sequential extractions providing insight into the sediment forms of P and Fe. Additional sediment cores were incubated under oxic and anoxic conditions and the respective fluxes of P and Fe across the sediment water interface were measured.</p><p>The results suggest that Fe and P dynamics in the lake sediments are strongly coupled. We also find that the P dynamics are sensitive to the amount of Fe supplied, even though enhanced burial of P in the sediment was not detected. The results of the sequential extraction procedure for P, which distinguishes P associated with humic acids and Fe oxides, as well as reduced flux of Fe(II) across the sediment water interface in the anoxic incubations, suggest a major role of organic matter in the interaction of Fe and P in these sediments.</p><p>Further research will include investigations of the role of organic matter and sulphur in determining the success of Fe-treatment in sequestering P in lake sediments. Based on these data in combination with reactive transport modelling we aim to constrain conditions for successful lake restoration through Fe addition.</p>

Application of composite flocculants for removing organic matter and mitigating ultrafiltration membrane fouling in surface water treatment: the role of composite ratio

2019 ◽  
Vol 5 (12) ◽  
pp. 2242-2250
Author(s):  
Xue Shen ◽  
Baoyu Gao ◽  
Kangying Guo ◽  
Qinyan Yue
Keyword(s):  
Organic Matter ◽  
Water Treatment ◽  
Surface Water ◽  
Membrane Permeability ◽  
Natural Organic Matter ◽  
Membrane Fouling ◽  
Ultrafiltration Membrane ◽  
Surface Water Treatment ◽  
Ultrafiltration Membrane Fouling

Coagulation prior to the ultrafiltration (UF) process was implemented to improve natural organic matter (NOM) removal and membrane permeability.

DRIFTS Studies on the Role of Surface Water in Stabilizing Catechol–Iron(III) Complexes at the Gas/Solid Interface

2013 ◽  
Vol 117 (40) ◽  
pp. 10368-10380 ◽  
Author(s):  
Julia Tofan-Lazar ◽  
Arthur Situm ◽  
Hind A. Al-Abadleh
Keyword(s):  
Surface Water ◽  
Solid Interface

Effect of multicomponent fouling during microfiltration of natural surface waters containing nC60 fullerene nanoparticles

2017 ◽  
Vol 3 (4) ◽  
pp. 744-756 ◽  
Author(s):  
R. Floris ◽  
G. Moser ◽  
K. Nijmeijer ◽  
E. R. Cornelissen
Keyword(s):  
Water Treatment ◽  
Surface Water ◽  
Surface Waters ◽  
Membrane Fouling ◽  
Industrial Water ◽  
Water Composition ◽  
Water Treatment Plants ◽  
Fullerene Nanoparticles ◽  
Microfiltration Membranes

To understand and mitigate the role of surface water composition and associated membrane fouling in the removal of nC60 nanoparticles by low-pressure membranes, experiments were carried out with microfiltration membranes using natural feed waters, mimicking separation in real industrial water treatment plants.

The role of abiotic and biotic cues in burrow habitat selection by juvenile crayfish

Behaviour ◽  
2017 ◽  
Vol 154 (12) ◽  
pp. 1177-1196 ◽  
Author(s):  
Mallary Clay ◽  
Jim Stoeckel ◽  
Brian Helms
Keyword(s):  
Surface Water ◽  
Habitat Selection ◽  
Site Selection ◽  
Soil Type ◽  
Environmental Cues ◽  
Suitable Habitat ◽  
Critical Information ◽  
Conspecific Adult ◽  
The Devil

Environmental cues contain critical information for individuals while searching for mates and suitable habitat. Crayfish have well-developed chemosensory abilities for detecting environmental cues in water; much less is known about these abilities on land. The Devil crayfish (Cambarus diogenes) is a burrowing crayfish often found in dense floodplain colonies as adults. Juveniles however are released in surface water and must navigate overland to burrow. Previous work demonstrates juveniles use cues from conspecific adults, and to a lesser extent, soil cues, for burrow site selection. Using mesocosms, we build on this by examining burrowing cues associated with (1) congeneric adults, (2) excavated burrow material and (3) other juveniles. In contrast to conspecific adults, cues provided by congeneric adults did not override cues associated with soil type. Similarly, juveniles burrowed closer to conspecific adult burrow mounds than to congeneric and human-built mounds. Juveniles also showed significant grouping behaviour in the absence of all other cues. These results suggest juvenile crayfish integrate multiple terrestrial cues for burrow site selection.

scholarly journals The role of surface water redistribution in an area of patterned vegetation in a semi-arid environment, south-west Niger

1997 ◽  
Vol 198 (1-4) ◽  
pp. 1-29 ◽  
Author(s):  
J. Bromley ◽  
J. Brouwer ◽  
A.P. Barker ◽  
S.R. Gaze ◽  
C. Valentine
Keyword(s):  
Surface Water ◽  
Arid Environment ◽  
South West ◽  
Water Redistribution ◽  
Semi Arid

Study on the Formation and Repeated Opening Mechanism of Ground Fissures under the Role of Surface Water

2011 ◽  
Vol 243-249 ◽  
pp. 3238-3243
Author(s):  
Zhen Wei Jiang ◽  
Qi Yao Wang
Keyword(s):  
Surface Water ◽  
Theoretical Analysis ◽  
Complex Network ◽  
Network Structure ◽  
Water Loss ◽  
Vertical Displacement ◽  
Hydraulic Pressure ◽  
Ground Fissures ◽  
Loess Region

The role of surface water is also the main reason for the formation and development of ground fissures. Five mechanisms were obtained on the formation of ground fissures under the role of surface water in the loess region through theoretical analysis, i.e., fissuring mechanism induced by loess collapsible deformation; that induced by dissolution and suffosion; that induced by water-loss shrinkage; that induced by hydraulic pressure; that induced by humidification and softening. As the role of surface water had certain phased and periodic characteristics, repeated fissuring mechanism of ground fissures was analyzed. Consequently, it could be known that the repeated fissuring of ground fissures under the role of surface water was mainly shown as horizontal openness and closure with little vertical displacement, and fissures were intersected and cross-cut with each other to form a complex network structure.

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