Letteratura scientifica selezionata sul tema "Nutrients in lagoons"
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Articoli di riviste sul tema "Nutrients in lagoons"
1
Zoidou, Maria, Nikolaos Kokkos e Georgios Sylaios. "Dynamics of Water, Salt, and Nutrients Exchange at the Inlets of Three Coastal Lagoons". Journal of Marine Science and Engineering 10, n. 2 (2 febbraio 2022): 205. http://dx.doi.org/10.3390/jmse10020205.
Testo completoAbstract (sommario):
The intertidal patterns at the inlet of three coastal lagoons (Agiasma, Porto Lagos, and Xirolimni) in Northern Greece were investigated by combining in situ samplings and computational efforts. These lagoons are Mediterranean, microtidal coastal systems, connected with the adjacent open sea (Thracian Sea) through their inlet canals and are highly affected by the lagoon–sea exchange processes. Limited freshwater enters their basins, mostly due to precipitation and agricultural drainage. An intense monitoring program of water flow and quality at the mouth of the three lagoons was carried out, aiming to quantify the transport mechanisms of water, salt, and nutrients across the inlet canal under different tidal/meteorological conditions. Ebb currents were recorded higher than flood currents, and the temporal variability of the longitudinal velocity was characterized by asymmetries. Residual currents were important to the water exchange, with the Eulerian water, salt, and nutrient fluxes being an order of magnitude larger than the Stokes drift. Eulerian transport and tidal pumping are considered as important mechanisms for salt and nutrients exchange through the inlets. The return flow factor varied from 1 to 17.5% of the water exiting the lagoons in ebb, while the residence time ranged from 0.7 days to 4.2 days.
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Bleich, Monica Elisa, Roberto Moraes Lima Silveira e Flávia Maria Barros Nogueira. "Limnological patterns in northern pantanal lagoons". Brazilian Archives of Biology and Technology 52, n. 3 (giugno 2009): 755–64. http://dx.doi.org/10.1590/s1516-89132009000300028.
Testo completoAbstract (sommario):
The aim of this work was to correlate the limnological patterns recorded among ten lagoons in the northern part of the Pantanal of Mato Grosso with some aspects of the lagoons related to their physical and biological characteristics. Some lagoon characteristics, such as connection with the river and the presence of floating macrophytes were important to group similar lagoons into categories. Attempts were also made to determine which kind of the nutrients could be limiting phytoplankton productivity in the lagoons of the northern Pantanal. Data was collected in nine lagoons during the flooding stage in January 2004, and nutrient and chlorophyll a was followed in a tenth lagoon from June 2004 to October 2004. The phytoplankton biomass was significantly associated with the nitrogen concentration during the flooding and drought periods. All the studied lagoons were potentially limited by the nitrogen concentration with a strong negative relationship between the chlorophyll a biomass and ammonium concentration during the drought season. The drought season also had nearly three times more chlorophyll a biomass when compared to the flooding period.
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Tay, Collins, Ruby Asmah e Charles A. Biney. "A comparative study of the pollution status of Sakumo II and Muni Lagoons in Ghana". Water Science and Technology 62, n. 5 (1 settembre 2010): 1067–75. http://dx.doi.org/10.2166/wst.2010.359.
Testo completoAbstract (sommario):
The pollution status of Sakumo II and Muni Lagoons and Mamahuma and Gbagbla Ankonu feeder streams, which feed Sakumo II along the coast of Ghana, were assessed and compared. As expected of saline waters, pH values of both lagoons fell within a slightly neutral to saline range whilst, the feeder streams were moderately saline. Conductivity distribution also showed saline (>5.0 mS cm−1) characteristics of the lagoons, while, the feeder streams are brackish (1.5–5.0 mS cm−1). DO concentrations in both lagoons indicated a wide variation. Relatively high BOD and nutrients content of Sakumo II and the feeder streams suggested that, Sakumo II and its feeder streams are moderately to grossly polluted. However, Muni Lagoon was characterized by relatively low BOD and nutrients content suggesting relatively low anthropogenic impact. The ionic dominance patterns for Sakumo II and Muni Lagoons were: Na+ > Mg2 + > Ca2 + and Cl− > HCO3− > SO42−, Na+ > Ca2 + > Mg2 + and Cl− > HCO3− > SO42−, respectively. Using water quality index (WQI), Sakumo II was found to be grossly polluted and requires mitigation measures, while, Muni Lagoon was of fairly good quality and requires monitoring.
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Li, R. H., S. M. Liu, Y. W. Li, G. L. Zhang, J. L. Ren e J. Zhang. "Nutrient dynamics in tropical rivers, estuarine-lagoons, and coastal ecosystems along the eastern Hainan Island". Biogeosciences Discussions 10, n. 6 (5 giugno 2013): 9091–147. http://dx.doi.org/10.5194/bgd-10-9091-2013.
Testo completoAbstract (sommario):
Abstract. Nutrient dynamics were studied along the eastern Hainan Island based on field observations during 2006–2009, to understand nutrient biogeochemical processes and to have an overview of human perturbations on coastal ecosystems in this tropical region. The concentrations of nutrients in the rivers had seasonal variations enriched with dissolved inorganic nitrogen (DIN). High riverine concentrations of nitrate were mainly originated from agricultural fertilizer input. The ratios of DIN : PO43− ranged from 37 to 1063, suggesting preferential PO43− relative to nitrogen in the rivers. The areal yields of dissolved silicate (DSi) varied from 76 to 448 × 103 mol km−2 yr−1 due to erosion over the drainage area, inducing high levels of DSi among worldwide tropical systems. Aquaculture ponds contained high concentrations of NH4+ (up to 157 μM) and DON (up to 130 μM). Particulate phosphorus concentrations (0.5 ∼1.4 μM) were in lower level comparied with estuaries around the world. Particulate silicate levels in rivers and lagoons were lower than global average level. Nutrient biogeochemistry in coastal areas were affected by human activities (e.g. aquaculture, agriculture), as well as natural events such as typhoon. Nutrient concentrations were low because open sea water dispersed land-derived nutrients. Nutrient budgets were built based on a steady-state box model, which showed that riverine fluxes would be magnified by estuarine processes (e.g. regeneration, desorption) in the Wenchanghe/Wenjiaohe Estuary, Wanquan River estuary, and the Laoyehai Lagoon except in the Xiaohai Lagoon. Riverine and groundwater input were the major sources of nutrients to the Xiaohai Lagoon and the Laiyehai Lagoon, respectively. Riverine input and aquaculture effluent were the major sources of nutrients to the eastern coastal of Hainan Island. Nutrient inputs to the coastal ecosystem can be increased by typhoon-induced runoff of rainwater, and phytoplankton bloom in the sea would be caused.
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Painter, Kristin J., Robert B. Brua, John Spoelstra, Geoff Koehler e Adam G. Yates. "Fate of bioavailable nutrients released to a stream during episodic effluent releases from a municipal wastewater treatment lagoon". Environmental Science: Processes & Impacts 22, n. 12 (2020): 2374–87. http://dx.doi.org/10.1039/d0em00315h.
Testo completoAbstract (sommario):
Fate of nutrients from episodic wastewater lagoon effluent release was studied. Quantity of labile P in pulses often exceeded uptake. Management of lagoons should thus be informed by stream processing.
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Li, R. H., S. M. Liu, Y. W. Li, G. L. Zhang, J. L. Ren e J. Zhang. "Nutrient dynamics in tropical rivers, lagoons, and coastal ecosystems of eastern Hainan Island, South China Sea". Biogeosciences 11, n. 2 (30 gennaio 2014): 481–506. http://dx.doi.org/10.5194/bg-11-481-2014.
Testo completoAbstract (sommario):
Abstract. Nutrient dynamics based on field observations made along the eastern Hainan Island during the period 2006–2009 were investigated to understand nutrient biogeochemical processes, and to provide an overview of human perturbations of coastal ecosystems in this tropical region. The rivers showed seasonal variations in nutrient concentrations, with enrichment of dissolved inorganic nitrogen and dissolved silicate, and depletion of PO43−. High riverine concentrations of nitrate mainly originated from agricultural fertilizer inputs. The DIN : PO43− ratios ranged from 37 to 1063, suggesting preferential depletion of PO43− relative to nitrogen in rivers. Chemical weathering in the drainage area might explain the high levels of dissolved silicate. Aquaculture ponds contained high concentrations of NH4+ and dissolved organic nitrogen. The particulate phosphorus concentrations in the study area were lower than those reported for estuaries worldwide. The particulate silicate levels in rivers and lagoons were lower than the global average level. Nutrient biogeochemistry in coastal areas was affected by human activities (e.g., aquaculture, agriculture), and by natural phenomena including typhoons. The nutrient concentrations in coastal waters were low because of dispersion of land-derived nutrients in the sea. Nutrient budgets were built based on a steady-state box model, which showed that riverine fluxes are magnified by estuarine processes (e.g., regeneration, desorption) in estuaries and Laoyehai Lagoon, but not in Xiaohai Lagoon. Riverine and groundwater inputs were the major sources of nutrients to Xiaohai and Laoyehai lagoons, respectively, and riverine inputs and aquaculture effluents were the major sources for the eastern coast of Hainan Island. Nutrient inputs to the coastal ecosystem increased with typhoon-induced runoff of rainwater, elucidating the important influence of typhoons on small tropical rivers.
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Giraldo, E., e A. Garzón. "The potential for water hyacinth to improve the quality of Bogota River water in the Muña Reservoir: comparison with the performance of waste stabilization ponds". Water Science and Technology 45, n. 1 (1 gennaio 2002): 103–10. http://dx.doi.org/10.2166/wst.2002.0014.
Testo completoAbstract (sommario):
The potential application of Water Hyacinth (Eichhornia crassipes) in organic matter degradation, sedimentation, nutrient and heavy metal absorption and sulfur reduction in the Muña Reservoir has been tested in experimental lagoons. The lagoons were operated at hydraulic retention times (HRT) of 6, 9 and 15 days. One lagoon was covered with Water Hyacinth, which is naturally growing in the Muña Reservoir, while another lagoon was operated as a conventional oxidation pond. The Water Hyacinth lagoon had better removal efficiencies for almost all parameters measured: BOD5, total suspended solids, COD, nitrogen, phosphorus and heavy metals. The oxidation lagoon was facultative for HRT of 9 and 15 days, and anoxic when operated at 6 days HRT. At HRT of 15 days the water quality in the effluent of the covered lagoon corresponded to 12 mg/l of BOD, 6 mg/l of suspended solids and 0.8 mg/l of hydrogen sulfide. Hydrogen sulfide levels in the Muña reservoir can be substantially reduced at HRT higher than 15 days in both lagoons. The uncovered lagoon had better hydrogen sulfide removal during the day but presents high levels at night. If the hydraulic retention time in the Muña reservoir is increased, the water quality of the Bogota river can be substantially improved for all the HRTs tested in the pilot units. HRT seems to give a better prediction of overall effluent water quality than surface loading. More research is needed in order to define the optimum water hyacinth density in the Muña reservoir to determine its influence on the water quality of the effluent. The influence is expected to be negative due to an internal increase of BOD, solids, nutrients and metals loads due to plant decay.
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Henderson, Amy, Emek Kose, Allison Lewis e Ellen R. Swanson. "Mathematical modeling of algal blooms due to swine CAFOs in Eastern North Carolina". Discrete & Continuous Dynamical Systems - S 15, n. 3 (2022): 555. http://dx.doi.org/10.3934/dcdss.2021151.
Testo completoAbstract (sommario):
<p style='text-indent:20px;'>Dramatic strides have been made in treating human waste to remove pathogens and excess nutrients before discharge into the environment, to the benefit of ground and surface water quality. Yet these advances have been undermined by the dramatic growth of Confined Animal Feeding Operations (CAFOs) which produce voluminous quantities of untreated waste. Industrial swine routinely produce waste streams similar to that of a municipality, yet these wastes are held in open-pit "lagoons" which are at risk of rupture or overflow. Eastern North Carolina is a coastal plain with productive estuaries which are imperiled by more than 2000 permitted swine facilities housing over 9 million hogs; the associated 3,500 permitted manure lagoons pose a risk to sensitive estuarine ecosystems, as breaches or overflows send large plumes of nutrient and pathogen-rich waste into surface waters. Understanding the relationship between nutrient pulses and surface water quality in coastal environments is essential to effective CAFO policy formation. In this work, we develop a system of ODEs to model algae growth in a coastal estuary due to a manure lagoon breach and investigate nutrient thresholds above which algal blooms are unresolvable.</p>
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Furtado, André Luiz dos Santos, Peter Casper e Francisco de Assis Esteves. "Methanogenesis in an impacted and two dystrophic coastal lagoons (Macaé, Brazil)". Brazilian Archives of Biology and Technology 45, n. 2 (giugno 2002): 195–202. http://dx.doi.org/10.1590/s1516-89132002000200011.
Testo completoAbstract (sommario):
This study investigated the methanogenic activity in sediment of the Imboacica (human impacted), Cabiúnas and Comprida coastal lagoons in Rio de Janeiro State (Brazil). Methane was not detected in water and sediment samples from the three lagoons. The measured nutrient concentrations in the pore-water indicated that methanogens activity was not limited by nutrients. Methanogenic activity was not detected under in vitro conditions, indicating that terminal organic carbon mineralisation via methanogenesis was negligible for the top 6 cm of sediment at the sampling time.
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Padedda, B. M., S. Pulina, P. Magni, N. Sechi e A. Lugliè. "Phytoplankton dynamics in relation to environmental changes in a phytoplankton-dominated Mediterranean lagoon (Cabras Lagoon, Italy)". Advances in Oceanography and Limnology 3, n. 2 (4 settembre 2012): 147. http://dx.doi.org/10.4081/aiol.2012.5331.
Testo completoAbstract (sommario):
In Mediterranean lagoons, macrophytes often surpass phytoplankton as the most important primary producers. Less frequently, phytoplankton dominates throughout the year, thus knowledge of its dynamics is relatively limited and scattered. In this study, we assessed over two years the dynamics of phytoplankton assemblages, including potential harmful algal species (HAS), in relation to environmental changes in the phytoplankton-dominated Cabras Lagoon (Sardinia, Italy). The lagoon was characterised by uniform spatial conditions, wide temporal variations in salinity (40 PSU) and high nutrient availability. Phosphorus was highest in summer, possibly recycled within the system, while dissolved inorganic nitrogen increased in winter and spring due to watershed discharge. Chlorophyll a, positively correlated with nutrients and rainfall, showed a typical bimodal pattern with summer-winter blooms. Modifications in phytoplankton composition strongly correlated with extreme weather events, such as intense rainfall. This generated an abrupt salinity decrease that, combined with high nutrient availability, favoured the dominance of Cyanophyceae of reduced cell size, such as Cyanobium and Rhabdoderma species. We suggest that the prolonged and intense dominance of Cyanophyceae, added to other HAS, has a negative impact on the primary economic activities of the lagoon, such as fishery, and generally on the whole lagoon functioning.
Tesi sul tema "Nutrients in lagoons"
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Keogh, Andrew James, of Western Sydney Hawkesbury University, Faculty of Science and Technology e School of Applied and Environmental Sciences. "Systems management of Glenbrook Lagoon, New South Wales". THESIS_FST_AES_Keogh_A.xml, 1996. http://handle.uws.edu.au:8081/1959.7/423.
Testo completoAbstract (sommario):
Glenbrook Lagoon, an 8 hectare lake receiving rainfall runoff from a residential catchment, is experiencing nutrient enrichment problems expressed as excessive aquatic plant presence. This study aims to assess the relative nutrient contribution of the total system compartments, including catchment loading, water column, aquatic plants and surface sediment. This information is utilised in the formulation of management strategies which may produce a sustainable nutrient reduction and general improvement in the system. The total nutrient content of the aquatic system was determined to be high in comparison with the present nutrient loading from the catchment. The ideal management case considers nutrient reduction of the surface sediment compartment firstly, followed by the aquatic plant community, with the water column and catchment influence as relatively low priority compartments. Various strategies for managing these are proposed. The total system benefits of the ideal management case are reductions in nutrients, aquatic plant biovolume and suspended solid loading. Unavoidable constraints placed upon the ideal management case include the excessive aquatic plant presence restricting accessability to the surface sediment for dredging. The resulting best management case requires aquatic plant eradication prior to sediment management, with the total system benefits associated with the ideal management case being retained.Master of Science (Hons)
2
Badosa, i. Salvador Anna. "Limnological characteristics and zooplankton community structure of Mediterranean coastal lagoons undergoing restoration". Doctoral thesis, Universitat de Girona, 2007. http://hdl.handle.net/10803/7869.
Testo completoAbstract (sommario):
Entre 1999 i 2003 es va desenvolupar un projecte Life de restauració a la maresma de La Pletera, afectada per un pla urbanització, i a la llacuna del Ter Vell, amb un elevat grau d'eutròfia (aiguamolls del Baix Ter, NE Península Ibèrica). L'objectiu d'aquesta tesi és establir el funcionament d'ambdós ecosistemes, analitzar-ne la problemàtica ambiental i avaluar els efectes de la restauració. A la maresma de la Pletera, es va analitzar el paper de la hidrologia en la composició i dinàmica dels nutrients i del zooplàncton en cinc llacunes, tres de les quals havien estat creades dins el projecte de restauració com a nous refugis per una espècie de peix amenaçada (Aphanius iberus). La hidrologia es va caracteritzar per un llarg període de confinament sense entrades d'aigua, interromput de manera irregular per inundacions puntuals. La dinàmica del nitrogen inorgànic es va relacionar amb les entrades d'aigua, mentre que la del fòsfor, del nitrogen total i de la matèria orgànica es va relacionar amb els processos d'acumulació i reciclatge intern durant el confinament. El zooplàncton es va analitzar mitjançant la combinació d'aproximacions taxonòmiques i de mides. L'estructura de mides de la comunitat es va veure més afectada per les interaccions tròfiques (depredació i competència) mentre que l'estructura taxonòmica va ser més sensible a factors abiòtics (nutrients). El ràpid creixement de la població A. iberus en les noves llacunes va suggerir que aquestes havien proporcionat l'hàbitat adequat per a l'espècie, almenys a curt termini.
Les actuacions de restauració a la llacuna del Ter Vell es van centrar en la millora de la qualitat de l'aigua mitjançant (1) la construcció d'uns aiguamolls per depurar l'aigua d'entrada i (2) el dragat del sediment en diversos punts. Simultàniament a la restauració, però de forma independent, la gestió agrícola de l'aigua va reduir dràsticament el cabal d'entrada d'aigua dolça a la llacuna, provocant un canvi en el règim hídric. Es van analitzar els efectes a curt termini d'aquest canvi sobre la limnologia i el zooplàncton de la llacuna. Abans del canvi, la hidrologia era artificial ja que s'havia prolongat l'entrada d'aigua dolça d'acord amb la demanda agrícola, i per tant la llacuna presentava una elevada taxa de renovació de l'aigua i majors concentracions de nutrients. Després del canvi, la hidrologia va dependre més del clima, es van reduir les entrades d'aigua i es va allargar el període de confinament. La composició y dinàmica dels nutrients va tendir a assemblar-se a l'observada a les llacunes de la maresma, mentre que la comunitat del zooplàncton no ho va fer. L'estat ecològic de la llacuna va millorar després del canvi en el règim hídric.
Between 1999 and 2003, a restoration Life project was developed in La Pletera salt marshes, affected by an urbanisation plan, and in the Ter Vell lagoon, a highly eutrophic lagoon (Baix Ter Wetlands, NE Iberian Peninsula). The aim of this thesis is to establish the natural functioning of both ecosystems, analyze their environmental problematic and also to evaluate the effects of the restoration measures.
In La Pletera salt marshes, the role of the hydrological regime in the nutrient and zooplankton composition and dynamics was analysed in five brackish lagoons. Three of them were created in the framework of the restoration project as new refuges for an endangered fish species (A. iberus). The hydrology was determined by a prolonged period of confinement without water inputs, irregularly interrupted by sudden flooding events. While the dynamics of inorganic nitrogen depended on the water inputs variability, dynamics of phosphorus, total nitrogen and organic matter was related more to the cumulative mechanisms and internal recycling during the confinement periods. The zooplankton community structure was analysed by means of the combination of taxon- and size-based approaches. Whereas the community size structure was more affected by trophic interactions (predation and competition), the taxonomic structure appeared to be more sensitive to abiotic factors (nutrients). The fast growth of the size population of A. iberus in the new lagoons suggested that they had provided a suitable refuge for this species, at least in the short-term.
Restoration actions in the Ter Vell lagoon were focused on the improvement of the water quality by means of (1) wetlands construction to reduce nutrient inputs and (2) sediment dredging. Simultaneously, but independent of the restoration activities, water management in agriculture drastically reduced the freshwater inflow to the lagoon and, therefore, changed the hydrological regime. The short-term effects of this hydrological change on the limnological characteristics and the zooplankton of the lagoon were analysed. Before the change, the hydrology was artificial since the freshwater flooding period was prolonged due to the high agricultural demand. As a result, the lagoon showed a high water turnover rate and high nutrient concentrations. After the change, hydrology was climate-dependent, with scarce water inputs and prolonged confinement periods. Then, the nutrient composition and dynamics tended to be more similar to those observed in the salt marsh lagoons. However, zooplankton did not tend to resemble to that of the salt marsh lagoons. The ecological status of the Ter Vell lagoon was improved after the hydrological change.
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Carmo, Clovis Ferreira do. "Influência do aqüífero freático na dinâmica de nutrientes (nitrogênio e fósforo) em lagoas com diferentes características hidrodinâmicas". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/18/18139/tde-08042008-152521/.
Testo completoAbstract (sommario):
A zona de desembocadura do rio Paranapanema na Represa de Jurumirim é uma região de desaceleração da velocidade da correnteza associada a um grande número de ambientes aquáticos com diferentes características hidrodinâmicas. Com o objetivo de avaliar a influência do aqüífero freático superficial na dinâmica de nutrientes (nitrogênio, fósforo e os principais cátions), foram estudadas três lagoas marginais, com diferentes graus de conexão com o rio: 1) Lagoa do Coqueiral (LCQ), com elevada conectividade com o rio Paranapanema; 2) Lagoa do Camargo (LCM), com conexão permanente com o rio, mas com baixa troca de \"informações\" e 3) Lagoa dos Cavalos (LCV), ambiente isolado do ecossistema lótico. Em outubro de 2002 (final da estação de seca na região) foram perfurados poços e instalados piezômetros para determinação da superfície piezométrica e do gradiente hidráulico entre o rio e as lagoas marginais estudadas. Durante as perfurações foram retiradas amostras dos estratos do solo para análises granulométricas, capacidade de troca de cátions, matéria orgânica, soma de bases trocáveis, porcentagem de saturação de bases, macro-nutrientes e micro-nutrientes. A amostragem foi realizada em campanhas mensais no período de abril de 2003 a abril de 2005. As amostras de água subterrânea foram coletadas com o auxilio de garrafas de coleta, com volume de 1,0 L, específicas para amostragem em piezômetros. No rio e nas lagoas a coleta foi realizada na subsuperfície em pontos próximos da zona de transição entre os sistemas aquático e terrestre. A condutividade hidráulica foi determinada no campo utilizando-se testes do tipo slug. Nas amostras de água foram determinados os valores de pH, condutividade e os teores de nitrogênio total, fósforo total, cálcio, magnésio, sódio, alumínio, manganês, bário, zinco e cobalto. Os resultados obtidos do gradiente hidráulico, juntamente com os dados de precipitação, mostraram que o ambiente lótico torna-se influente no período de chuvas e no período de seca as lagoas, preferencialmente, assumem essa condição. A aplicação de modelos lineares generalizados e do teste de Tukey mostrou variações temporais na maioria das variáveis. Uma relação crescente com o tempo foi observada para as concentrações de nitrogênio, fósforo e alumínio. Os valores de pH, condutividade, cálcio, magnésio, manganês, zinco e cobalto apresentaram uma relação temporal decrescente. Em relação ao ambiente, para os dados de condutividade, pH e sódio, foram identificadas diferenças entre as três lagoas. A maioria das variáveis apresentou diferenças significativas entre a água subterrânea e as águas superficiais (rio e lagoa). Na concentração de fósforo foram observadas diferenças entre a água do aqüífero e a água do rio. Estimativa média da contribuição de nitrogênio total e fósforo total via água subterrânea para o conteúdo total nos sistemas conectados oscilaram entre 6% para o sistema Lagoa do Coqueiral a 16% no sistema Lagoa do Camargo respectivamente. No sistema isolado Lagoa dos Cavalos as estimativas da contribuição, via água subterrânea em relação ao conteúdo total da lagoa, foram maiores para o fósforo total (média = 11%) quando comparadas com as estimadas para o nitrogênio total (média = 7%).The discharge zone of Paranapanema river at Jurumirim reservoir is an area of decreased current velocity associated to a great number of aquatic environments with different hydrodynamic characteristics. To evaluate the influence of the superficial phreatic aquifer in the nutrient dynamics (nitrogen and phosphorus and main cations), three floodplain lakes with different degrees of connection to the main channel were studied: 1) Coqueiral Lake (LCQ), with high connection to Paranapanema river; 2) Camargo Lake (LCM), with permanent connection to the main channel but low \"information\" interchange and 3) Cavalos Lake (LCV), isolated from the main channel. In October 2002 (end of the regional dry period) piezometers were installed at drilled wells to evaluate the piezometric surface and the hydraulic gradient between the main channel and floodplain lakes. During drilling, samples of soil strata were collected to proceed granulometric analysis, cation interchange capacity, organic matter, sum of exchangeable bases, percent base saturation, macro and micro-nutrients. Sampling was undertaken from April 2003 to April 2005. Groundwater samples were collected with 1,0 L bailers, specific for piezometers sampling. At the main channel and floodplain lakes, sampling was undertaken at the subsurface at stations located near the transitions zone between the aquatic and terrestrial systems. The hydraulic conductivity was determined by slug tests. Values of pH, conductivity, total nitrogen and phosphorus, calcium, magnesium, sodium, aluminum, manganese, barium, zinc and cobalt were obtained for the water samples. Hydraulic gradient and pluviometric data showed that the lotic environment exerts influence during the raining period; during the dry one, this role is played by the lakes. Most variables showed temporal variation when submitted to generalized linear models and the test of Tukey. An increased relationship with time was observed for nitrogen, phosphorus and aluminum concentrations. Values of pH, conductivity, calcium, magnesium, manganese, zinc and cobalt showed a decreasing temporal relationship. Concerning the conductivity, pH and sodium data of the environment, differences among the three lakes were evaluated. Most variables showed significative differences between ground and surface waters (river and lakes). The aquifer and river waters showed differences concerning the concentrations of phosphorus. Mean estimates of the total nitrogen and phosphorus groundwater contribution to the total content fluctuated, in the connected system, between 6%, for the Coqueiral Lake system, to 16%, for Camargo Lake system respectively. For the isolated system Cavalos Lake, the groundwater contribution estimates related to the total content of the lake were higher for total phosphorus (average = 11%) when compared to the total nitrogen estimates (average = 7%).
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Giordano, Juliette Christina Poleto. "Nutrient Loading and System Response in the Coastal Lagoons of the Delmarva". W&M ScholarWorks, 2009. https://scholarworks.wm.edu/etd/1539617889.
Testo completo
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Delgado, Carlos Alexandre Romano. "Potencialidades da utilização de efluentes de lagoas de estabilização para irrigação em agricultura no Alentejo". Master's thesis, Universidade de Évora, 2002. http://hdl.handle.net/10174/15520.
Testo completoAbstract (sommario):
Nos últimos anos, tem-se verificado um crescente incremento na reutilização de água na agricultura, devido à crescente escassez dos recursos hídricos de boa qualidade e ao aumento do consumo de água. A poupança deste recurso através da reutilização, contribui para a poupança de água de boa qualidade e para o aproveitamento de efluentes tratados, permitindo que os nutrientes neles contidos sejam reciclados. Como caso de estudo, foram seleccionadas todas as ETAR urbanas com lagoas de estabilização que servem aglomerados com mais de 2000 habitantes em funcionamento no Alentejo e verificada a possibilidade de reutilização em agricultura. Através dos resultados analíticos dos efluentes, verificou-se que houve parâmetros que não cumpriram o normativo que rege as descargas de águas residuais. Os efluentes que apresentaram melhor qualidade para rega, foram os provenientes das ETAR que registaram maior eficiência de remoção acumulada: Alcácer do Sal, Aljustrel, Arraiolos, Barrancos, Beja, Monforte, Vendas Novas e Vidigueira. O resultado do efluente médio da ETAR de Monforte, foi o único que cumpriu inteiramente a legislação portuguesa relativamente à qualidade da água para rega, enquanto que os restantes teriam que ser sujeitos a uma desinfecção por cloragem ou ultra violetas para melhorar a qualidade microbiológica. O pH dos efluentes de Alter do Chão, Arraiolos, Monforte e Vendas Novas ultrapassaram o VMR sendo aconselhável proceder a uma correcção para que não haja alteração da estrutura e alcalinidade do solo. Registaram-se valores elevados de matéria orgânica traduzidos pela concentração elevada de SST, CQO e CB05 nos efluentes das ETAR de Aljustrel, Alter do Chão, Arraiolos, Avis, Barrancos, Campo Maior (Z.E. e Z.O.), Castro Verde, Redondo Horta do Grilo, Reguengos e Vendas Novas, podendo ocorrer colmatagem do solo, depósito sobre as folhas e frutos e entupimento nos equipamentos de rega. A rega com os efluentes estudados é indicada para culturas com grande demanda de fertilizantes e que não apresentem riscos de contaminação como é o caso de cereais, forragens para fenar ou ensilar e culturas industriais (girassol, algodão e árvores). O trabalho enquadra ainda, em termos gerais, a utilização de águas residuais em agricultura, contemplando os usos possíveis, características dos efluentes utilizáveis, comportamento dos agentes poluentes no solo, tratamento de efluentes e os aspectos de natureza prática e legal envolvidos.
/*** Abstract - As a consequence of the increase of the demand of water and of the growing shortage of the hydric resources good quality, the reutilization of waters in the agriculture has been suffering, since the last years, a great increment. This reutilization not only allows the saving of hydric resources of good quality, but also contributes to the treatment of the waters. It constitutes an alternative in terms of final destination of the treated effluent and it allows the nutrient contained to be recycle. As an example, it were chosen all the urban wastewaters treatment station headquarters with fixed lagoons, that are responsible to serving agglomerates with more than 2000 inhabitants in operation in Alentejo and it was also checked the possibility of reutilization in agriculture. Through the analytic results of the effluents, there were values that didn't fulfil the standard for the discharge of wastewater. The effluents that were considered to have best quality for irrigation were the ones from the wastewater treatment station: Alcácer do Sal, Aljustrel, Arraiolos, Barrancos, Beja, Monforte, Vendas Novas and Vidigueira because they had the best efficiency in accumulated removal. The only one that followed the portuguese legislation concerning the quality of water for irrigation, was the result of the medium effluent of Monforte wastewater treatment station. The others would have to be desinfected with chorine or ultra-violets to improve their microbiologic quality. The results of the pH on the effluents of Alter do Chão, Arraiolos, Monforte and Vendas Novas exceeded the maximum value recommended, so that, it's advisable to proceed to a correction to maintain the structure and alkalinity of there soils. In the effluents of the wastewaters treatment station of Aljustrel, Alter do Chão, Arraiolos, Avis, Barrancos, Campo Maior (Z.E. and Z.O.), Castro Verde, Redondo Horta do Grilo, Reguengos and Vendas Novas there, were registers of high concentration of Total Suspense Solids, COD and BOD. Considering that, it can ocur an accumulation of sediments on the soil and leaves and fruits and obstruction of the irrigation equipment’s. Irrigation with the studied effluents is indicated for cultures with great search for fertilizers and without dangers of contamination, like cereals, industrial cultures (sunflower, cotton and trees) and fodder for hay ensile. The essay also contains, in general terms, the use of wastewater in agriculture, regarding the possible applications, the characteristics of the useful effluents, the behavior of the agents of polutins in the soil, the eflluents treatment and involved aspects of practical and legal nature.
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Stanhope, Jennifer Wu. "Relationships between Watershed Characteristics and Base Flow Nutrient Discharges to Eastern Shore Coastal Lagoons, Virginia". W&M ScholarWorks, 2003. https://scholarworks.wm.edu/etd/1539617803.
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Andrisoa, Aladin Danoary. "Ecological impacts of groundwater discharge to Mediterranean coastal lagoons". Thesis, Aix-Marseille, 2019. http://theses.univ-amu.fr.lama.univ-amu.fr/190326_ANDRISOA_564o889xp122jxhof868gdfl_TH.pdf.
Testo completoAbstract (sommario):
Bien que l’importance des eaux souterraines et des eaux porales (recirculation) en tant que voie d’apports de nutriments vers les systèmes côtiers soit de plus en plus reconnue, il y a encore peu d’information sur leur réel rôle écologique. Cette thèse vise à évaluer l’impact des flux d’eaux souterraines et du processus de recirculation au sein du sédiment sur le fonctionnement des écosystèmes lagunaires côtiers et sur leur vulnérabilité face aux impacts anthropiques et climatiques. Deux lagunes contrastées de la côte méditerranéenne française ont été étudiées (Etangs de La Palme et Salses-Leucate). Nos résultats montrent que la recirculation est la principale source d'azote inorganique dissous (DIN) et de phosphore inorganique dissous (DIP) dans la lagune de La Palme. Les signatures isotopiques d'azote (δ15N) chez les macrophytes et le phytoplancton reflètent principalement celles des formes inorganiques dissoutes des eaux souterraines et des eaux porales dans les lagunes de La Palme et de Salses-Leucate, démontrant ainsi le rôle significatif de ces sources dans le soutien de la production primaire. Les signatures isotopiques du carbone (δ13C) indiquent que les eaux souterraines sont également des sources importantes de carbone inorganique dissous pour les producteurs primaires. Cette étude montre aussi que les moules des sites influencés par les eaux souterraines ont un taux de croissance et un indice de condition (poids des tissus / poids de la coquille) plus élevés que ceux du site témoin hors influence des eaux souterraines probablement dues aux températures hivernales plus élevées et à l'apport permanent d'éléments nutritifs provenant des eaux souterrainesWhilst the role of groundwater discharge and porewater fluxes (recirculation) as important pathways for nutrient delivery to coastal systems is increasingly being recognized, there remains limited evidence of its “downstream” ecological implications. This thesis aims at investigating the ecological role that groundwater flows play in some aspects of the functioning and vulnerability of coastal lagoonal ecosystems. Two contrasting lagoons on the french mediterranean coastline were studied (La Palme and Salses-Leucate lagoons). Our results show that the recirculation of lagoon water through the lagoon sediments is the main source of both dissolved inorganic nitrogen (DIN) and phosphorous (DIP) to La Palme lagoon. The nitrogen isotopic signatures (δ15N) in primary producers reflect predominantly the nitrogen isotopic signatures of the terrestrial (karstic) groundwater and porewater source in both La Palme and Salses-Leucate lagoons, demonstrating the important role of these sources in supporting primary production. The carbon isotope signatures (δ13C) indicate groundwater discharge as a significant source also of dissolved inorganic carbon to primary producers. Further more, the variations in growth rate and condition index (tissue weight / shell weight) of the Mediterranean mussels growing in and outside groundwater-influence in Salses-Leucate lagoon were examined. Mussels from the groundwater-influenced sites have higher growth rate and condition index compared to those from the control site, likely as consequence of both the higher winter temperatures and the groundwater-driven nutrient supply that increase the food availability to support mussel growth
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Dunn, Ryan J. K. "Biogeochemical Processes of a Sub-tropical Coastal Lagoon (Coombabah Lake, Southern Moreton Bay, Australia): With Emphasis on Organic Matter and Nutrient Dynamics". Thesis, Griffith University, 2009. http://hdl.handle.net/10072/365282.
Testo completoAbstract (sommario):
Coombabah Lake is a sub-tropical, semi-urbanised, shallow lagoon in southern Moreton Bay (Australia), recognised nationally and internationally as an important conservation and habitat zone. However, significant increases in urban development have occurred within the lagoon catchment in recent times, raising concerns over the sustainability of the lagoon ecosystem. This is typical of many estuarine environments which are ecologically and economically important waterways that often become surrounded by urban development and therefore experience degradation of water and sediment quality. The processes controlling the distribution of organic matter and nutrients in estuaries are especially important in understanding their chemical cycling. Consequently, the assessment and understanding of biogeochemical processes and other influential factors is essential for the effective management of estuaries. This study is a multi-disciplinary investigation of biological, physical, and biogeochemical processes occurring in the surface sediments and overlying waters of Coombabah Lake and the adjoining creek. The primary aim of this study was to investigate physico-chemical and biogeochemical processes occurring over various patial and temporal scales and improve the understanding of Coombabah Lake and similar shallow sub-tropical systems. Spatial variability of physico-chemical surface sediment variables and the sources and distribution of surface sediment organic matter were investigated to provide an understanding of the physico-chemical and ecological processes driving the lagoon system. Lagoon sediments were characterised by generally fine sediments with predominantly sandier sediments occurring within the northern region and muddier sediments occurring within the southern region. Although some sediment locations had elevated nutrient concentrations in comparison to adjacent lagoon sediments, nutrient concentrations within the lagoon were generally typical of Australian estuarine environments. Comprehensive analysis of biomarkers indicated that the lagoon received organic matter from a variety of autochthonous and allochthonous sources including terrestrial vascular plants (i.e. surrounding mangroves), diatoms, and benthic bacteria with the fringing mangroves potentially playing an important role in the lagoon food web. The intratidal variability of hydrological and physico-chemical variables were measured and the filterable nutrient and chlorophyll-a transport loads entering the lagoon determined. Instrumental measurements and hourly water collections provided the first account of intratidal variability within the system and indicated the lagoon and adjoining creek was characterised by a mixed tidal regime with cyclic and temporal variations in physico-chemical variables, suspended solids, and chl-a concentrations. Both dissolved oxygen and turbidity values exceeded regulatory guideline values for the region. Nutrient concentrations were typical of local and Australian estuarine environments and exceeded regulatory guideline values for the region. Nutrients sourced externally from the Coombabah Lake-Creek system resulted in increased transportation rates during flood events indicating a potential for increased nutrient loadings and enrichment within the lagoon and associated wetland environment...Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Engineering
Science, Environment, Engineering and Technology
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Serpa, Dalila do Rosário Encarnação. "Macroalgal (Enteromorpha spp. and Ulva spp.) primary productivity in the Ria Formosa Lagoon". Master's thesis, Faculdade de Ciências e Tecnologia, 2005. http://hdl.handle.net/10362/12085.
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Kendrick, Martin. "Algal bioreactors for nutrient removal and biomass production during the tertiary treatment of domestic sewage". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8944.
Testo completoAbstract (sommario):
This thesis covers work carried out on algae bioreactors as a tertiary treatment process for wastewater treatment. The process was primarily assessed by the removal of Phosphorus and Nitrogen as an alternative to chemical and bacterial removal. Algal bioreactors would have the added advantage of carbon sequestration and a by-product in the energy rich algal biomass that should be exploited in the existing AD capacity. Laboratory scale bioreactors were run (4.5-30L) using the secondary treated final effluent from the local Loughborough sewage works. In a preliminary series of experiments several different bioreactor designs were tested. These included both batch feed and continuous flow feed configurations. The bioreactors were all agitated to keep the algal cells in suspension. The results demonstrated that the most effective and easy to operate was the batch feed process with the algal biomass by-product harvested by simple gravitational settling. Experiments also compared an artificial light source with natural light in outdoor experiments. Outdoor summer light produced greater growth rates but growth could not be sustained in natural UK winter light. Light intensity is proportional to productivity and algae require a minimum of around 97W/m2 to grow, an overcast winter day (the worst case scenario) was typically around 78W/m2, however this was only available for a few hours per day during Nov-Jan. The process would be better suited to areas of the world that receive year round sunlight. It was shown that phosphorus could be totally removed from wastewater by the algae in less than 24 hours depending on other operating variables. With optimisation and addition of more carbon, a HRT of 10-12 hours was predicted to achieve the EU WFD / UWWTD standard. It was further predicted that the process could be economically and sustainably more attractive than the alternatives for small to medium sized works. Biomass 3 concentrations of between 1-2g/L were found to best achieve these removals and produce the fastest average growth rates of between 125-150mg/L/d. The uptake rates of phosphorus and nitrogen were shown to be dependent on the type of algae present in the bioreactor. Nitrogen removal was shown to be less effective when using filamentous bluegreen algae whilst phosphorus removal was almost completely stopped compared to unicellular green algae that achieved a nitrogen uptake of 5.3mg/L/d and phosphorus uptake of 8mg/L/d. Soluble concentrations of Fe, Ni and Zn were also reduced by 60% in the standard 10 hours HRT. The predominant algae were shown to depend largely on these concentrations of phosphorus and nitrogen, and the strain most suited to that specific nutrient or temperature environment dominated. Nutrient uptake rates were linked to algal growth rates which correlated with the availability of Carbon as CO2. CO2 was shown to be the limiting factor for growth; becoming exhausted within 10 hours and causing the pH to rise to above 10.5. The literature showed this was a common result and the use of CO2 sparging would more than double performance making this process a good candidate for waste CO2 sequestration. Heat generated from combustion or generators with exhaust CO2 would also be ideal to maintain a year round constant temperature of between 20-25°C within the bioreactors. A number of possible uses for the algal biomass generated were examined but currently the most feasible option is wet anaerobic co-digestion. Further economic analysis was recommended on the balance between land area and complementary biomass generation for AD. It was also suggested given the interest as algae as a future fuel source, the process could also be adapted for large scale treatment and algal biomass production in areas of the world where land was available.
Libri sul tema "Nutrients in lagoons"
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Martin, Jonathan B. Quantification of ground water discharge and nutrient loading to the Indian River Lagoon: Final report. Palatka, Fla: St. Johns River Water Management District, 2002.
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Sumner, D. M. Hydraulic characteristics and nutrient transport and transformation beneath a rapid infiltration basin, Reedy Creek Improvement District, Orange County, Florida. Tallahassee, Fla: U.S. Geological Survey, 1996.
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M, Gilliland Paul, e UK Marine SACs Project, a cura di. Investigating and managing water quality in saline lagoons: Based on a case study of nutrients in the Chesil and the Fleet European marine site. English Nature, 2000.
Cerca il testo completoCapitoli di libri sul tema "Nutrients in lagoons"
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Lucena, Joan Ramon, Josep Hurtado e Francisco A. Comín. "Nutrients related to the hydrologic regime in the coastal lagoons of Viladecans (NE Spain)". In Nutrients and Eutrophication in Estuaries and Coastal Waters, 413–22. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-2464-7_31.
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Herrera-Silveira, Jorge A., Israel Medina-Gomez e Reyna Colli. "Trophic status based on nutrient concentration scales and primary producers community of tropical coastal lagoons influenced by groundwater discharges". In Nutrients and Eutrophication in Estuaries and Coastal Waters, 91–98. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-2464-7_7.
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Wilson, James G., Mary Brennan e Anne Murray. "Particulate inputs to Dublin Bay and to the South Lagoon, Bull Island". In Nutrients and Eutrophication in Estuaries and Coastal Waters, 195–204. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-2464-7_16.
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Muduli, Pradipta R., Manas Barik, Prasannajit Acharya, Alaya T. Behera e Ishan B. Sahoo. "Variability of Nutrients and Their Stoichiometry in Chilika Lagoon, India". In Coastal Ecosystems, 139–73. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-84255-0_7.
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Frascari, F., G. Matteucci e P. Giordano. "Evaluation of a eutrophic coastal lagoon ecosystem from the study of bottom sediments". In Nutrients and Eutrophication in Estuaries and Coastal Waters, 387–401. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-017-2464-7_29.
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Viaroli, Pierluigi, Mariachiara Naldi, Cristina Bondavalli e Silvano Bencivelli. "Growth of the seaweed Ulva rigida C. Agardh in relation to biomass densities, internal nutrient pools and external nutrient supply in the Sacca di Goro lagoon (Northern Italy)". In Coastal Lagoon Eutrophication and ANaerobic Processes (C.L.E.AN.), 93–103. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1744-6_8.
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Viaroli, Pierluigi, Marco Bartoli, Cristina Bondavalli, Robert R. Christian, Gianmarco Giordani e Mariachiara Naldi. "Macrophyte communities and their impact on benthic fluxes of oxygen, sulphide and nutrients in shallow eutrophic environments". In Coastal Lagoon Eutrophication and ANaerobic Processes (C.L.E.AN.), 105–19. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1744-6_9.
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Niencheski, Luis Felipe, Maria Graça Baumgarten, Gilberto Fillmann e Herbert L. Windom. "Nutrients and Suspended Matter Behaviour in the Patos Lagoon Estuary (Brazil)". In Estuaries of South America, 67–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60131-6_4.
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Wielgat, Magdalena. "Compilation of Nutrient Loads for the Szczecin Lagoon (Southern Baltic)". In Baltic Coastal Ecosystems, 75–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04769-9_7.
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Falcao, M., e C. Vale. "Nutrient Variability in a Shallow Coastal Lagoon (Ria Formosa, Portugal)". In Estuarine Water Quality Management, 321–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75413-5_47.
Testo completoAtti di convegni sul tema "Nutrients in lagoons"
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Aleksandrov, Sergey, Sergey Aleksandrov, Julia Gorbunova e Julia Gorbunova. "CLIMATE CHANGE: HOW DOES THIS INFLUENCE ON ECOSYSTEM HEALTH IN THE LAGOON OF THE BALTIC SEA?" In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93942cc882.47943475.
Testo completoAbstract (sommario):
Lagoons are one of the most vulnerable ecosystems to impacts of natural environmental and anthropogenic factors. The Curonian and Vistula Lagoons are one of the largest lagoons of Europe. The Curonian Lagoon is choke mostly freshwater, while the Vistula Lagoon is restricted brackish water. Hydrological, chemical and biological researches were carried out monthly since 1991 to 2014. Reductions of nutrients loading in 1990s did not result in improvement of the ecological situation. Hydrological and chemical parameters are the main factors that influence on the algal blooms and ecosystem health in these lagoons. The Curonian Lagoon may be characterized as hypertrophic water body with "poor" water quality. Climate change in 1990s-2010s combined with other factors (freshwater, slow-flow exchange, high nutrients concentrations) creates conditions for Cyanobacteria “hyperblooms”. Harmful algal blooms result in deterioration of the water chemical parameters and death of fish. "Hyperblooms" is the most dangerous for coastal towns and tourist resorts (UNESCO National Park "Curonian Spit"). Climate change in 1990s-2000s have been also observed in Vistula Lagoons (mean annual temperature increased by 1.4°C for 40 years), but brackish water prevent harmful algal hyperblooms. After the invasion of the filter-feeding mollusk Rangia water quality was significantly improved in 2011-2014, but ecosystem productivity remained at a stable long-term level.
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Aleksandrov, Sergey, Sergey Aleksandrov, Julia Gorbunova e Julia Gorbunova. "CLIMATE CHANGE: HOW DOES THIS INFLUENCE ON ECOSYSTEM HEALTH IN THE LAGOON OF THE BALTIC SEA?" In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316a72251.
Testo completoAbstract (sommario):
Lagoons are one of the most vulnerable ecosystems to impacts of natural environmental and anthropogenic factors. The Curonian and Vistula Lagoons are one of the largest lagoons of Europe. The Curonian Lagoon is choke mostly freshwater, while the Vistula Lagoon is restricted brackish water. Hydrological, chemical and biological researches were carried out monthly since 1991 to 2014. Reductions of nutrients loading in 1990s did not result in improvement of the ecological situation. Hydrological and chemical parameters are the main factors that influence on the algal blooms and ecosystem health in these lagoons. The Curonian Lagoon may be characterized as hypertrophic water body with "poor" water quality. Climate change in 1990s-2010s combined with other factors (freshwater, slow-flow exchange, high nutrients concentrations) creates conditions for Cyanobacteria “hyperblooms”. Harmful algal blooms result in deterioration of the water chemical parameters and death of fish. "Hyperblooms" is the most dangerous for coastal towns and tourist resorts (UNESCO National Park "Curonian Spit"). Climate change in 1990s-2000s have been also observed in Vistula Lagoons (mean annual temperature increased by 1.4°C for 40 years), but brackish water prevent harmful algal hyperblooms. After the invasion of the filter-feeding mollusk Rangia water quality was significantly improved in 2011-2014, but ecosystem productivity remained at a stable long-term level.
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Domnin, Dmitry, Dmitry Domnin, Boris Chubarenko, Boris Chubarenko, Rene Capell e Rene Capell. "MATHEMATICAL MODELING OF NUTRIENT LOADING FROM SMALL CATCHMENTS OF THE VISTULA LAGOON". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b93dfde6248.02952871.
Testo completoAbstract (sommario):
Vistula Lagoon as a part of the coastal zone translates nutrient load from catchment to the Baltic Sea. Catchments of the Primorskaya River (small settlements, mostly agricultural area, 120 km2) and Banówka-Mamonovka River (transboundary catchment between Russia and Poland, relatively big settlements, food production enterprises, agricultural activity, 490 km2) were selected as test ones for the Vistula Lagoon catchment (23 870 km2). Assessment of the retention of total nitrogen and phosphorus in the catchment and the transformation of nutrient load from anthropogenic sources while passing the catchment were studied by using open source numerical modeling tools. Initial data comprises the geomorphic characteristics, river net data, information on land use and nutrient point sources, time series of temperature, precipitation. Runoff was simulated by hydrological model HYPE considering the evaporation and infiltration into the soil. Retention and transport of nutrients were accessed using the model FyrisNP. Source apportionment was made for the nutrient load discharging from both catchments to the Vistula Lagoon. The greatest amount of nutrients in final discharge is coming from the arable land (50-80%), point sources constitute a smaller proportion (5-30%). The results will be used to obtain the first order approximation of the nutrient load from other small rivers of the Vistula Lagoon catchment and from the biggest river in the area, the Pregolya River (15 300 km2) by analogy.
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Domnin, Dmitry, Dmitry Domnin, Boris Chubarenko, Boris Chubarenko, Rene Capell e Rene Capell. "MATHEMATICAL MODELING OF NUTRIENT LOADING FROM SMALL CATCHMENTS OF THE VISTULA LAGOON". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b431754b7a5.
Testo completoAbstract (sommario):
Vistula Lagoon as a part of the coastal zone translates nutrient load from catchment to the Baltic Sea. Catchments of the Primorskaya River (small settlements, mostly agricultural area, 120 km2) and Banówka-Mamonovka River (transboundary catchment between Russia and Poland, relatively big settlements, food production enterprises, agricultural activity, 490 km2) were selected as test ones for the Vistula Lagoon catchment (23 870 km2). Assessment of the retention of total nitrogen and phosphorus in the catchment and the transformation of nutrient load from anthropogenic sources while passing the catchment were studied by using open source numerical modeling tools. Initial data comprises the geomorphic characteristics, river net data, information on land use and nutrient point sources, time series of temperature, precipitation. Runoff was simulated by hydrological model HYPE considering the evaporation and infiltration into the soil. Retention and transport of nutrients were accessed using the model FyrisNP. Source apportionment was made for the nutrient load discharging from both catchments to the Vistula Lagoon. The greatest amount of nutrients in final discharge is coming from the arable land (50-80%), point sources constitute a smaller proportion (5-30%). The results will be used to obtain the first order approximation of the nutrient load from other small rivers of the Vistula Lagoon catchment and from the biggest river in the area, the Pregolya River (15 300 km2) by analogy.
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Gorbunova, Julia, Julia Gorbunova, Boris Chubarenko, Boris Chubarenko, Dmitry Domnin, Dmitry Domnin, Jens Christian Refsgaard e Jens Christian Refsgaard. "ASSESSMENT OF NUTRIENT LOAD ON THE PREGOLYA RIVER BASIN (VISTULA LAGOON CATCHMENT) FROM THE ANTHROPOGENIC SOURCES". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b94681d1a25.68574351.
Testo completoAbstract (sommario):
The catchment area of the Pregolya River is about 65% of the Vistula Lagoon drainage basin and occupied by Russia and Poland in approximately equal proportions. Nutrient load from the catchment largely controls the eutrophication processes of the lagoon ecosystem. Open statistical data (2011-2014) were used for evaluating the nutrient loads. At present, the nutrient load from the major anthropogenic sources (population, livestock, poultry and crop production) is 53,267 tons N/year and 16,424 tons P/year in the Pregolya River catchment. This results in loads of 23,032 tons N/year and 2,819 tons P/year when the removal of nutrients by the harvest is taken into account. It was found that the load from anthropogenic sources in the Polish part of the catchment higher than in the Russian part by a factor of three times for nitrogen and two times for phosphorus. The reason for this is that Polish territory is relatively more agriculturally developed. In the Kaliningrad Oblast agriculture declined in the 1990-2000's and now about 50% of arable lands are not used, which creates a potential for development. Currently there is a positive trend of the agriculture development and the "Strategy of socio-economic development of the Kaliningrad Oblast until 2020" is expected to increase arable land by 70%, the number of cattle and pigs by factors of 3.5 and 9.5, respectively. This creates a potential for significant increases of the nutrients loading and eutrophication of the Vistula Lagoon. The nutrient load from the anthropogenic sources in the Russian part of the catchment can be compensated greatly by using the manure as organic fertilizer replacing mineral fertiliser, as at present time 40% of available arable land in the Kaliningrad Oblast is sufficient for utilization of all manure originated locally at the maximum fertilization rate recommended by HELCOM. At the same time more than 80% of the wastewater in Kaliningrad Oblast is not sufficiently treated. This poses a great potential for nutrient load reduction. The calculations showed that equipment of Kaliningrad city with the modern treatment facilities will reduce the nutrient load by 1,400 tons N/year and 290 tons P/year.
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Gorbunova, Julia, Julia Gorbunova, Boris Chubarenko, Boris Chubarenko, Dmitry Domnin, Dmitry Domnin, Jens Christian Refsgaard e Jens Christian Refsgaard. "ASSESSMENT OF NUTRIENT LOAD ON THE PREGOLYA RIVER BASIN (VISTULA LAGOON CATCHMENT) FROM THE ANTHROPOGENIC SOURCES". In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316662769.
Testo completoAbstract (sommario):
The catchment area of the Pregolya River is about 65% of the Vistula Lagoon drainage basin and occupied by Russia and Poland in approximately equal proportions. Nutrient load from the catchment largely controls the eutrophication processes of the lagoon ecosystem. Open statistical data (2011-2014) were used for evaluating the nutrient loads. At present, the nutrient load from the major anthropogenic sources (population, livestock, poultry and crop production) is 53,267 tons N/year and 16,424 tons P/year in the Pregolya River catchment. This results in loads of 23,032 tons N/year and 2,819 tons P/year when the removal of nutrients by the harvest is taken into account. It was found that the load from anthropogenic sources in the Polish part of the catchment higher than in the Russian part by a factor of three times for nitrogen and two times for phosphorus. The reason for this is that Polish territory is relatively more agriculturally developed. In the Kaliningrad Oblast agriculture declined in the 1990-2000's and now about 50% of arable lands are not used, which creates a potential for development. Currently there is a positive trend of the agriculture development and the "Strategy of socio-economic development of the Kaliningrad Oblast until 2020" is expected to increase arable land by 70%, the number of cattle and pigs by factors of 3.5 and 9.5, respectively. This creates a potential for significant increases of the nutrients loading and eutrophication of the Vistula Lagoon. The nutrient load from the anthropogenic sources in the Russian part of the catchment can be compensated greatly by using the manure as organic fertilizer replacing mineral fertiliser, as at present time 40% of available arable land in the Kaliningrad Oblast is sufficient for utilization of all manure originated locally at the maximum fertilization rate recommended by HELCOM. At the same time more than 80% of the wastewater in Kaliningrad Oblast is not sufficiently treated. This poses a great potential for nutrient load reduction. The calculations showed that equipment of Kaliningrad city with the modern treatment facilities will reduce the nutrient load by 1,400 tons N/year and 290 tons P/year.
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P.W. Westerman, J. Arogo Ogejo, G. L. Grabow e M. E. Adcock. "Swine Anaerobic Lagoon Nutrient Concentration Variation with Season, Lagoon Level, and Rainfall". In 2006 Portland, Oregon, July 9-12, 2006. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2006. http://dx.doi.org/10.13031/2013.21144.
Testo completo
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Saqib Mukhtar, Jeffrey L. Ullman, Brent W. Auvermann, Sam E. Feagley e Todd Carpenter. "Nutrient and Sludge Assessment of Dairy Lagoons in Central Texas". In 2001 Sacramento, CA July 29-August 1,2001. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2001. http://dx.doi.org/10.13031/2013.4129.
Testo completo
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Gunatilaka, Amara, Pompeo Moscetta, Luca Sanfilippo, Enrico Savino, Cristina Dell'Olivo, Francesca Scardia, Alessandro Gurato e Jesus Cisneros-Aguirre. "Observations on continuous nutrient monitoring in Venice Lagoon". In OCEANS 2009. IEEE, 2009. http://dx.doi.org/10.23919/oceans.2009.5422371.
Testo completo
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DUBRA, Vytautas. "SOME PECULIARITIES OF SPATIAL DISTRIBUTION OF LAND-BASED INORGANIC NUTRIENTS IN THE COASTAL PART OF THE BALTIC SEA". In Rural Development 2015. Aleksandras Stulginskis University, 2015. http://dx.doi.org/10.15544/rd.2015.070.
Testo completoAbstract (sommario):
The Baltic Sea is a semi-enclosed sea with remarkable cyclonic circulation. The most attention must be paid to the local-scale factors playing the significant role in the overall figures. Fresh water inflow takes the majority of the mass budget income thus enabling local streams. The bathymetry of the Lithuanian Baltic zone is lowering gradually towards the open sea and has no significant deeps or depths. As the little exception there is a deeper basin, which stretches from the Curonian Spit until it reaches the approaches of the Southern Gotland Deep. The long-term investigations of spatial seasonal distribution of inorganic nutrients (nitrite, nitrate and orthophosphate) resulted to some regularities depending on prevailing wind scale duration and force. The results obtained during the experiment showed the complicacy of field structure. Extremely heterogeneous patterns of nutrients are formed when northern or eastern winds or breezes are prevailing. After the other wind directions significant decrease of heterogeneity was observed. Assessment showed that Curonian Lagoon water entering the Baltic Sea is enriched with dissolved inorganic nitrogen 6 times more and dissolved inorganic phosphorus concentration is higher by 2 times in comparison to the open sea values in winter.