scholarly journals Surface-Water Quality and Nutrient Loads in the Nepaug Reservoir Watershed, Northwestern Connecticut, 1999-2001

2006 ◽  
Author(s):  
Jonathan Morrison ◽  
Michael J. Colombo
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Nutrient Loads ◽  
Reservoir Watershed

scholarly journals Groundwater impacts on surface water quality and nutrient loads in lowland polder catchments: monitoring the greater Amsterdam area

2018 ◽  
Vol 22 (1) ◽  
pp. 487-508 ◽  
Author(s):  
Liang Yu ◽  
Joachim Rozemeijer ◽  
Boris M. van Breukelen ◽  
Maarten Ouboter ◽  
Corné van der Vlugt ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Anthropogenic Sources ◽  
Nutrient Concentrations ◽  
Nutrient Loads ◽  
Surface Water Chemistry ◽  
Seepage Rate ◽  
Groundwater Seepage ◽  
Nutrient Levels

Abstract. The Amsterdam area, a highly manipulated delta area formed by polders and reclaimed lakes, struggles with high nutrient levels in its surface water system. The polders receive spatially and temporally variable amounts of water and nutrients via surface runoff, groundwater seepage, sewer leakage, and via water inlets from upstream polders. Diffuse anthropogenic sources, such as manure and fertiliser use and atmospheric deposition, add to the water quality problems in the polders. The major nutrient sources and pathways have not yet been clarified due to the complex hydrological system in lowland catchments with both urban and agricultural areas. In this study, the spatial variability of the groundwater seepage impact was identified by exploiting the dense groundwater and surface water monitoring networks in Amsterdam and its surrounding polders. A total of 25 variables (concentrations of total nitrogen (TN), total phosphorus (TP), NH4, NO3, HCO3, SO4, Ca, and Cl in surface water and groundwater, N and P agricultural inputs, seepage rate, elevation, land-use, and soil type) for 144 polders were analysed statistically and interpreted in relation to sources, transport mechanisms, and pathways. The results imply that groundwater is a large source of nutrients in the greater Amsterdam mixed urban–agricultural catchments. The groundwater nutrient concentrations exceeded the surface water environmental quality standards (EQSs) in 93 % of the polders for TP and in 91 % for TN. Groundwater outflow into the polders thus adds to nutrient levels in the surface water. High correlations (R2 up to 0.88) between solutes in groundwater and surface water, together with the close similarities in their spatial patterns, confirmed the large impact of groundwater on surface water chemistry, especially in the polders that have high seepage rates. Our analysis indicates that the elevated nutrient and bicarbonate concentrations in the groundwater seepage originate from the decomposition of organic matter in subsurface sediments coupled to sulfate reduction and possibly methanogenesis. The large loads of nutrient-rich groundwater seepage into the deepest polders indirectly affect surface water quality in the surrounding area, because excess water from the deep polders is pumped out and used to supply water to the surrounding infiltrating polders in dry periods. The study shows the importance of the connection between groundwater and surface water nutrient chemistry in the greater Amsterdam area. We expect that taking account of groundwater–surface water interaction is also important in other subsiding and urbanising deltas around the world, where water is managed intensively in order to enable agricultural productivity and achieve water-sustainable cities.

Effect of fall-applied manure practices on runoff, sediment, and nutrient surface transport from silage corn in south coastal British Columbia

2002 ◽  
Vol 82 (4) ◽  
pp. 445-456 ◽  
Author(s):  
L J.P. van Vliet ◽  
B J Zebarth ◽  
G. Derksen
Keyword(s):  
Water Quality ◽  
British Columbia ◽  
Surface Water ◽  
Lolium Multiflorum ◽  
Winter Season ◽  
Surface Water Quality ◽  
Suspended Solid ◽  
Italian Ryegrass ◽  
Annual Rainfall ◽  
Nutrient Loads

Runoff from manured cropland during the wet fall and winter season, when 70% of the annual rainfall occurs, is a surface water quality concern in the Lower Fraser Valley of British Columbia. This study compares different fall-manure application strategies on runoff and contaminant transport from silage corn (Zea mays) land. The treatments were (i) a control, which did not receive manure in the fall; (ii) manure broadcast in the fall on corn stubble; and (iii) manure broadcast in the fall on corn stubble with an established relay crop. Runoff, solids, and nutrients loads from natural precipitation were measured on replicated experimental plots (0.0125 ha) from 1996 to 1998. Fall-applied manure on 3–5% sloping silage cornland without a relay crop resulted in a high risk to surface water quality, due to high suspended solid loads of between 7 and 14 Mg ha-1 yr-1 and high nutrient transport with mean annual total Kjeldahl N (TKN) P, and K loads of 98, 21, and 63 kg ha-1, respectively. Compared with no relay crop, intercropping silage corn with a relay crop of Italian ryegrass (Lolium multiflorum) reduced the mean annual runoff and suspended solid load by 53 and 74%, respectively, TKN load by 56%, P load by 42%, K load by 31%, and Cu load by 57%. Even though total nutrient loads were lower with the relay crop treatment, all fall manure treatments including the relay crop resulted in nutrient loads above guidelines for the first three runoff events immediately following application. Key words: Runoff, suspended solids, nutrient loads, relay crop, cover crop, silage corn, manure

scholarly journals Impact of biomass burning on surface water quality in Southeast Asia through atmospheric deposition: eutrophication modeling

2010 ◽  
Vol 10 (3) ◽  
pp. 7779-7818 ◽  
Author(s):  
P. Sundarambal ◽  
P. Tkalich ◽  
R. Balasubramanian
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Atmospheric Deposition ◽  
Biomass Burning ◽  
Nutrient Loading ◽  
Surface Water Quality ◽  
Companion Paper ◽  
Temporal Variations ◽  
Nutrient Loads ◽  
Chemical Contamination

Abstract. A numerical modeling approach is proposed for the assessment of the nutrient loading of coastal waters from atmospheric sources. The 3-D eutrophication model NEUTRO was enhanced to simulate the spatial distribution and temporal variations of nutrients, planktons and dissolved oxygen due to atmospheric nutrient loadings. It was found that nutrient loading from the atmospheric wet and dry deposition was remarkable during hazy days, the contribution being between 2 and 8 times that of non-hazy days; the smoke haze was due to biomass burning in the Southeast Asian region as discussed in a companion paper on field observations. Atmospheric nutrient loads during hazy days can lead to anthropogenic eutrophication and chemical contamination. The importance of regional smoke haze events in relation to non-hazy days to atmospheric nutrient deposition in terms of their biological responses in the coastal water of the Singapore region was investigated. The percentage increases of surface water nutrients due to atmospheric deposition during non-hazy and hazy days from seawater baseline were estimated. Model computations showed that atmospheric fluxes might account for up to 17–88% of total mass of nitrate nitrogen in the water column during hazy days and 4 to 24% during non-hazy days, which might be a relatively significant contribution into regional eutrophication. The results obtained from the modeling study could be used for a better understanding of the energy flow through the marine food web, exploring various possible scenarios concerning the atmospheric deposition of nutrients onto the coastal zone and studying their impacts on water quality.

scholarly journals Groundwater impacts on surface water quality and nutrient loads in lowland polder catchments: monitoring the greater Amsterdam area

2017 ◽  
Author(s):  
Liang Yu ◽  
Joachim Rozemeijer ◽  
Boris M. van Breukelen ◽  
Maarten Ouboter ◽  
Corné van der Vlugt ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Nutrient Concentrations ◽  
Nutrient Loads ◽  
Monitoring Networks ◽  
Total N ◽  
Seepage Rate ◽  
Groundwater Seepage ◽  
Groundwater Surface Water Interaction

Abstract. In this study, the spatial variability of the groundwater seepage impact was identified by exploiting the dense groundwater and surface water monitoring networks in Amsterdam and its surrounding polders. Twenty-three variables (concentrations of Total-N, Total-P, NH4, NO3, HCO3, SO4, Ca, and Cl in surface water and groundwater, seepage rate, elevation, land-use, and soil type) for 144 polders were analysed. The results imply that groundwater is a large source of nutrients in these mixed urban/agricultural catchments. It is confirmed by high correlations (R2 up to 0.88) between solutes in groundwater and surface water, together with the close similarities in their spatial patterns. The groundwater nutrient concentrations exceeded the surface water Environmental Quality Standards (EQSs) in 93 % of the polders for TP and in 91 % for TN. The elevated nutrient and bicarbonate concentrations in the groundwater seepage originate from the decomposition of organic matter in subsurface sediments coupled to sulfate reduction and possibly methanogenesis. The large loads of nutrient rich groundwater seepage into the deepest polders indirectly affect surface water quality in the surrounding area, because excess water from the deep polders is pumped out and used to supply water to the surrounding infiltrating polders in dry periods. The study shows the importance of the connection between groundwater and surface water nutrient chemistry in the greater Amsterdam area. We expect that taking account of groundwater-surface water interaction is also important in other subsiding and urbanising deltas around the world, where water is managed intensively in order to enable agricultural productivity and achieve water sustainable cities.

scholarly journals Eutrophication vulnerability analysis: a case study

1998 ◽  
Vol 37 (3) ◽  
pp. 121-128 ◽  
Author(s):  
José M. P. Vieira ◽  
José L. S. Pinho ◽  
António A. L. S. Duarte
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
River Flow ◽  
Treatment Plant ◽  
Surface Water Quality ◽  
Nutrient Loads ◽  
Management Scenarios ◽  
Local Conditions ◽  
Surface Water Supply

River Cavado water quality variability was studied for eutrophication vulnerability assessment at a new surface water supply intake. Since the river flow regime is artificially controlled by upstream multipurpose reservoirs, mathematical modelling was applied in evaluating alternative management scenarios. Due to the fact that surface water quality at intake location is mainly affected by a wastewater treatment plant effluent discharge 5 km upstream, algae and nutrients concentration simulations have been worked out in order to identify critical situations. Different algal concentration profiles along the river were obtained for local conditions of light energy, water temperature and estimated nutrient loads, showing high probability of eutrophication occurrence for some of the simulated scenarios. The discussion of results of this study appears to be very useful for river basin wide water management policies evaluation.

AN EVALUATION OF SUB-SURFACE WATER QUALITY AROUND BHARUCH-SURAT INDUSTRIAL REGION, GUJARAT, INDIA

2019 ◽  
Vol 38 (2) ◽  
pp. 200-220
Author(s):  
SOMNATH SAHA ◽  
◽  
SUKANTA KUMAR SAHA ◽  
TATHAGATA GHOSH ◽  
ROLEE KANCHAN ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Surface Water Quality ◽  
Industrial Region

Surface Water Quality Assessment. Case Study: Târnava Mare River, Mediaș Town-Romania

2011 ◽  
Vol 4 (5) ◽  
pp. 70-72
Author(s):  
Cristina Roşu ◽  
◽  
Ioana Piştea ◽  
Carmen Roba ◽  
Mihaela Mihu ◽  
...  
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Quality Assessment ◽  
Surface Water Quality ◽  
Water Quality Assessment
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