The impacts of current forest management methods on surface water quality, especially in northern parts of Sweden, are largely unexplored. In this review reports linked to logging impacts on catchment biogeochemistry, (with special emphasis on boreal ecosystems) has been assessed. Logging disturbances in boreal forest catchments can change biogeochemical processes in soils by alter transpiration, soil conditions, temperature, soil microbial activities and water fluxes. Combined these changes can cause increased soil nutrient leaching to receiving waters. In the studies reviewed, dissolved organic carbon (DOC) concentrations and export generally increased after logging. Similar responses followed for phosphorous (P), but to a lesser extent for nitrogen (N). Streamflow and peakflow and the export of suspended matter (SM) can also be altered after logging. Removal of streamside vegetation may result in increased stream water temperatures and potentially affect lake water temperature, deepen the epilimnion and deplete oxygen (O2) concentrations. Increased wind exposure can resuspend sediments and potentially release bioavailable P. Affected lake water concentrations of N can be considered negligible after logging, whereas tot-P concentrations has shown to increase to an almost twofold level in some studies. The overall impact on the pelagic productivity are therefore most likely those connected to increased DOC and SM concentrations. The general impact on fish biomass can be considered insignificant. In conclusions, to improve future forest management and for further understanding concerning the biogeochemical environmental impacts that forestry might have on freshwaters, additional studies are still required.

Cricket has evolved from a traditional and conservative sport to a fast-paced, vigorous game. As a result of this the physical conditioning programmes of players have changed drastically with regular fitness tests that are now an integral part of these programmes. In spite of this, no studies have made an attempt to determine the exact relationship between the physical and motor ability parameters of batsmen and their performance. The purpose of this study was, therefore, firstly to determine which physical and motor ability parameters discriminate between successful and less successful provincial academy batsmen and secondly, to determine how much these parameters contribute to the batting performance of provincial academy batsmen. Twenty-two batsmen from the Gauteng and North-West cricket academies in South Africa were used in this study. Thirteen batsmen (20.15 +- 1.41 years) participated during the 2004 season whilst nine batsmen (21.11 +- 1.83 years) took part during the 2005 season. The players were subjected to 23 physical and motor ability tests, whilst 72 isokinetic measurements were also taken. The data was analysed by means of descriptive statistics, cluster analyses, forward stepwise discriminant analyses and finally forward stepwise multiple regression analyses. The discriminant analyses showed that right (RKEPT) and left knee extensor peak torque (LKEPT), right knee extensor average power (RKEAP), left knee extensor total work (LKETW) and left knee flexor peak torque (LKFPT) (all at 30°/sec), as well as LKEPT, RKEPT and L.KEAP (all at 24O°/sec ), left (LIRAP) and right shoulder internal rotator average power (RIRAP). right shoulder external/internal rotator peak torque ratio (REIRPTR) and right shoulder internal rotator peak torque (RIRPTJ (all at 24O°/sec) as well as left shoulder internal rotator total work (LIRTW) (60°/sec) discriminated non-significantly between the successfu1 (top 5 ranked batsmen of both seasons) and less successful academy batsmen. The physical and motor ability parameters which were identified as discriminators were left 505 agility, shuttle run aerobic endurance and IRM (repetition-maximum) hack squat strength (all significant) (p 5<= 0.05) whilst left grip strength and abdominal muscle strength discriminated non-significantly. The forward stepwise multiple regression analyses indicated that RKEPT 30' (16%). LKEPT 30' (7%), RKEAP 30' (7%), LKFPT 30' (7%), LKEAP 240" (6%), RKFPT 240" (5%). LKETW 30" (5%) and LKEPT240° (4%) were the isokinetic knee strength parameters which contributed non-significantly to batting performance. The isokinetic shoulder strength parameters which also contributed non-significantly to batting performance were: RIRPT240° (28%). LIRAP 240' (16%), REZRPTR 240' (8%). LIRTW 60° (5%) and RIRAP 240' (4%). Vertical jumping power (13%) (p 50.05), left 505 agility (9%) (p 50.05), abdominal muscle strength (5%) (p 50.05), aerobic capacity (10%). IRM bench press strength (7%), IRM hack squat strength as well as left shoulder internal rotation flexibility (4% each) were the physical and motor ability parameters which contributed to batting performance. The conclusion that can, therefore, be drawn is that physical and motor ability parameters contribute to the performance of provincial academy batsmen and that these components should be included in the physical conditioning programmes of batsmen / Thesis (M.Sc. (Human Movement Science))--North-West University, Potchefstroom Campus, 2007.

Stellar bars are the most important internal drivers of the evolution of disk galaxies because they efficiently redistribute mass and angular momentum in the baryonic and dark matter components of galaxies. Mounting evidence suggests that mechanisms other than major mergers of galaxies, such as minor mergers, gas accretion, and bar-driven secular processes, play an important role in galaxy evolution since a redshift z~2. In order to characterize the evolution of barred disks, this thesis presents one of the most comprehensive studies of barred galaxies in the field at low redshifts, and also as a function of environment across galaxy clusters of different densities. This work improves significantly on earlier studies by using quantitative methods to characterize bars, analyzing high-quality data from some of the largest disk galaxy samples to date, and using results across a range of Hubble types and environments to test different theoretical models for the evolution of disk galaxies. Our main results are summarized below: (1) Studies done as a part of this thesis have quantitatively shown for the first time that the optical bar fraction in z~ 0 field galaxies is a sensitive and non-monotonic function of host galaxy properties, such as the luminosity, stellar mass, and bulge-to-disk ratio. We find that at z~0, the bar fraction increases significantly from galaxies of intermediate mass and Hubble types (Sb) toward those of lower mass and late Hubble types (Sd-Sm). The behavior from intermediate to early Hubble types is more uncertain. These results, which have been subsequently confirmed by independent studies, set constraints for theoretical models and in particular underline the importance for bar growth of angular momentum exchange between the bar, disk, bulge, and dark matter halo, as well as the possible triggering of bars by external satellites and interactions with the dark matter. Furthermore, our results at optical and near-infrared wavelengths on the fraction and sizes of bars at z~0 provide the zero-redshift anchor point for studies of bars at higher redshifts with current and future space missions (e.g., ACS, WFC3, JWST), and allow us to assess the systematic effects in such studies. (2) Although cluster environments are unique laboratories for investigating the evolution of barred disks, only sparse and disparate results have emerged from early studies. In this thesis, we study barred disks in clusters using high-quality data from the Hubble Space Telescope Advanced Camera for Surveys for the moderately-rich cluster Abell 901/902 (characterized by a galaxy number density n~1,000 gal Mpc⁻³) at z~0.165, and of the Coma cluster at z~0.02, the densest cluster (n~10,000 gal Mpc⁻³) in the nearby Universe. We find that the optical bar fraction for bright, early Hubble type disk galaxies does not show a statistically significant variation (within the error bars of ± 10 to 12%) as a function of galaxy environment within the Abell 901/902 cluster, as well as between the Abell 901/902 cluster and the field. Similarly, the optical bar fraction for bright S0 galaxies shows no statistically significant variation (within the error bars of ±10%) between the Virgo, Abell 901/902, and core of the Coma clusters, even though these environments span over an order of magnitude in galaxy number density (n~300 to 10,000 gal Mpc⁻³). We suggest that the S0 bar fraction is not greatly enhanced in denser environments, such as the core of Coma, due to the predominance of high speed encounters over slow ones, the tidal heating of S0 disks, and the low gas content of S0s in rich clusters. / text

Cricket has evolved from a traditional and conservative sport to a fast-paced, vigorous game. As a result of this the physical conditioning programmes of players have changed drastically with regular fitness tests that are now an integral part of these programmes. In spite of this, no studies have made an attempt to determine the exact relationship between the physical and motor ability parameters of batsmen and their performance. The purpose of this study was, therefore, firstly to determine which physical and motor ability parameters discriminate between successful and less successful provincial academy batsmen and secondly, to determine how much these parameters contribute to the batting performance of provincial academy batsmen. Twenty-two batsmen from the Gauteng and North-West cricket academies in South Africa were used in this study. Thirteen batsmen (20.15 +- 1.41 years) participated during the 2004 season whilst nine batsmen (21.11 +- 1.83 years) took part during the 2005 season. The players were subjected to 23 physical and motor ability tests, whilst 72 isokinetic measurements were also taken. The data was analysed by means of descriptive statistics, cluster analyses, forward stepwise discriminant analyses and finally forward stepwise multiple regression analyses. The discriminant analyses showed that right (RKEPT) and left knee extensor peak torque (LKEPT), right knee extensor average power (RKEAP), left knee extensor total work (LKETW) and left knee flexor peak torque (LKFPT) (all at 30°/sec), as well as LKEPT, RKEPT and L.KEAP (all at 24O°/sec ), left (LIRAP) and right shoulder internal rotator average power (RIRAP). right shoulder external/internal rotator peak torque ratio (REIRPTR) and right shoulder internal rotator peak torque (RIRPTJ (all at 24O°/sec) as well as left shoulder internal rotator total work (LIRTW) (60°/sec) discriminated non-significantly between the successfu1 (top 5 ranked batsmen of both seasons) and less successful academy batsmen. The physical and motor ability parameters which were identified as discriminators were left 505 agility, shuttle run aerobic endurance and IRM (repetition-maximum) hack squat strength (all significant) (p 5<= 0.05) whilst left grip strength and abdominal muscle strength discriminated non-significantly. The forward stepwise multiple regression analyses indicated that RKEPT 30' (16%). LKEPT 30' (7%), RKEAP 30' (7%), LKFPT 30' (7%), LKEAP 240" (6%), RKFPT 240" (5%). LKETW 30" (5%) and LKEPT240° (4%) were the isokinetic knee strength parameters which contributed non-significantly to batting performance. The isokinetic shoulder strength parameters which also contributed non-significantly to batting performance were: RIRPT240° (28%). LIRAP 240' (16%), REZRPTR 240' (8%). LIRTW 60° (5%) and RIRAP 240' (4%). Vertical jumping power (13%) (p 50.05), left 505 agility (9%) (p 50.05), abdominal muscle strength (5%) (p 50.05), aerobic capacity (10%). IRM bench press strength (7%), IRM hack squat strength as well as left shoulder internal rotation flexibility (4% each) were the physical and motor ability parameters which contributed to batting performance. The conclusion that can, therefore, be drawn is that physical and motor ability parameters contribute to the performance of provincial academy batsmen and that these components should be included in the physical conditioning programmes of batsmen / Thesis (M.Sc. (Human Movement Science))--North-West University, Potchefstroom Campus, 2007.

Made available in DSpace on 2014-06-11T19:23:24Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-06-19Bitstream added on 2014-06-13T20:50:15Z : No. of bitstreams: 1 mora_vb_me_jabo.pdf: 276160 bytes, checksum: 62b6aa6dcd319b16507ff77ed0114631 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / O objetivo deste trabalho foi caracterizar morfometricamente a bacia hidrográfica do rio Bobo, Estado de Nariño, Colômbia. A partir de cartas topográficas da área, na escala 1:25.000, foi gerado um mapa base da rede de drenagem e dos limites das microbacias de 2a ordem de magnitude. As características morfométricas dimensionais, do padrão da rede de drenagem e do relevo foram determinadas para o estudo do comportamento hidrológico da bacia. A bacia hidrográfica do Rio Bobo apresenta extensão superficial de 224,97 km2 e perímetro de 71,31km, sendo considerada de 6a ordem de magnitude. Ela é formada por 176 canais de 2a, 34 de 3a, 9 de 4a e 3 de 5a ordem de magnitude. Apresenta densidade de drenagem média de 3,71 km/km², que reflete a alta densidade, com conformação bastante forte e dissecada. A região caracteriza-se por apresentar um padrão de uso típico das zonas andinas, com bosque nativo e predomínio de culturas temporárias de batata e hortaliças tradicionais. / The objective of this work was to realize the morphometric characterization of the Bobo river watershed, Nariño State, Colombia. From topographical maps, scale 1:25.000, was created a map using as database the drainage net and the limit of each 2nd order microbasin. The dimensional, drainage net and relief morphometric parameters were evaluated for a previous hydrological study. The drainage area was 224.97 km2 and 71.31 km of perimeter. The Bobo river watershed is considered as 6th order of magnitude, and has 176 drainage channel of 2sd order of magnitude; 34 drainage channel of 3rd order of magnitude; 9 drainage channel of 4th order of magnitude; 3 drainage channel of 5th order of magnitude. The average drainage density is 3.71km/km², which reflect the high density, with a string and dissecated geological formation. The area shows an andine land use, with native vegetation and productive system with potato.

>Magister Scientiae - MSc / This research objectively investigates the e ectiveness of machine learning (ML) tools towards predicting several geo-physical parameters. This is based on a large number of studies that have reported high levels of prediction success using ML in the eld. Therefore, several widely used ML tools coupled with a number of di erent feature sets are used to predict six geophysical parameters namely rainfall, groundwater, evapora- tion, humidity, temperature, and wind. The results of the research indicate that: a) a large number of related studies in the eld are prone to speci c pitfalls that lead to over-estimated results in favour of ML tools; b) the use of gaussian mixture models as global features can provide a higher accuracy compared to other local feature sets; c) ML never outperform simple statistically-based estimators on highly-seasonal parame- ters, and providing error bars is key to objectively evaluating the relative performance of the ML tools used; and d) ML tools can be e ective for parameters that are slow- changing such as groundwater.

Aging and leaking water infrastructure wastes water resources and creates public health risks. Upgrading of potable water systems represents a large financial burden for water utilities and private property owners. The conventional approaches of repair, rehabilitation and replacement are very effective, but will take decades to implement even if a financial commitment to do so was made immediately. A novel approach of in-situ remediation of leaks, achieved by harnessing the ability of water or pipe to repair leaks via clogging, could potentially reduce leak rates and extend the lifetime of existing infrastructure at relatively low cost and inconvenience. Physical clogging, precipitation and metallic corrosion were identified as major mechanisms of in-situ leak remediation in potable water pipelines. Autogenous repair (i.e., self-repair without added particles) of small leak-holes (150–"1000 μm) in copper and iron was validated in the laboratory at water pHs of 3.0–11.0, operating water pressures of 20–60 psi, upward and downward leak orientations, and for a range of water chemistries. In bench scale experiments, the time to repair of iron pipe leaks increased with leak size to the power of 0.89–1.89, and decreased with pipe wall thickness to the power of -1.9 to -1.0. The time to repair of copper pipe leaks increased with water pressure to the power of 1.7. Additionally, the waters with a higher DO and corrosivity as measured by RSI, significantly decreased the time to repair of carbon steel 400 μm leaks by 50–70%. The presence of chlorine dioxide significantly increased the fraction of repaired 200 μm copper pipe leaks by 3 times when compared to the control without any disinfectant. In the building scale study, the fraction of repaired iron pipe leaks decreased with the logarithmic leak size with a slope of -0.65 after one-year duration of experiments, while leak orientation and water pressure were not influential in time to or likelihood of repair for iron pipe leaks. Addition of calcium carbonate particles (~8.8 μ]m), silica particles (~29 μm) and wood ash particles (~160 μm) in Blacksburg, VA tap water at a water pressure of 10 psi increased the fraction of remediated iron pipe leaks of 280–1000 μm diameter sizes. Although the control condition with no added particles for 58 days resulted in remediation of 0/12 leaks, remediation rate increased to 1/12 with calcium carbonate particles, to 10/12 with silica particles and to 10/12 with wood ash particles. Leak size and particle size played an important role in controlling the remediation success rate. The strength of the in-situ leak repair was sometimes very strong and resilient. The sealing materials of leak-holes repaired at 20–60 psi could sometimes withstand a 100 psi water pressure without failure, demonstrating the potential of the approach to sustain aging and leaking infrastructure. In-situ leak repair can also occur naturally, and the success rate might be unintentionally altered by adjustment of chemistry or treatments that decrease or increase particulates. / Ph. D.

Hohe Leistungsansprüche im Wettkampfsport erfordern von den Athleten eine hohe sportliche Belastbarkeit. Möglichkeiten die Trainingsumfänge und -intensitäten zu erhöhen, sind z.T. ausgeschöpft. So bestehen nach wie vor Bestrebungen neue Wege zu finden, um mögliche Leistungsreserven zu erschließen. Elektrotherapieverfahren haben sich im klinischen Alltag, u.a. zur Behandlung von Traumata, bewährt und werden häufig zum Zweck der Analgesierung, Verbesserung der Gewebedurchblutung und zur Muskelstimulation angewandt. Deren Einsatz im adjuvanten Bereich der Trainingsbegleitung wurde bislang nur vereinzelt beschrieben. In der vorliegenden Studie wurden die Auswirkungen einer elektromagnetischen Anwendungsform auf ausgewählte psycho-physische Parameter untersucht (Kontrollgruppenvergleich mit placebokontrolliertem Design), um Aussagen über praxisrelevante Ansätze zur trainingsunterstützenden Betreuung abzuleiten. Es stellte sich die Frage, ob eine Intervention (15 x / 4 Wo.) mit frequenzmodulierten Wechselströmen im vorwiegend niederfrequenten Wirkungsspektrum (0-10000Hz, 5 μA / cm², CellVAS®) zu einer Beeinflussung der untersuchten Parameter führen und dahingehend nachhaltige leistungsfördernde oder -reduzierende Effekte erzielt werden könnten. Des Weiteren sollte geprüft werden, inwiefen die erhobenen Parameter (PWC170, Squat-Jump, Lateralflexion der Wirbelsäule und SF36®) aussagekräftig genug sind. Die Wirksamkeit des Applikationsform wurde im Prä-Post-Vergleich vor (T1), nach (T2) und 4 Wo. nach Abschluss (T3, Nachhaltigkeit) der Intervention analysiert. Die Teilnehmer der Kontrollgruppe erhielten vergleichbare Applikationen im Placebomodus. Das Probandenkollektiv bestand aus gesunden Leistungssportlern, deren Sportarten einen hohen Kraftausdaueranteil enthielten (n=127). Die Gruppenzuteilung erfolgte teilrandomisiert in Haupt- (HG) und Kontrollgruppe (KG). Zudem wurden die Gruppen zusätzlich geschlechtsspezifisch getrennt. Im Untersuchungsverlauf ließen sich Veränderungen für die Leistungsparameter PWC170 und Squat Jump erkennen. Inwiefern diese Abweichungen auf den Einfluss der Intervention mit frequenzmodulierten Wechselströmen im niederfrequenten Wirkungsspektrum zurückzuführen sind, konnte in dieser Untersuchung nicht eindeutig geklärt werden. Die nachgewiesenen Effekte ließen sich nach den zu Grunde liegenden wissenschaftlichen Standards nicht statistisch valide belegen. Der wissenschaftliche Nachweis einer mögliche Leistungsveränderung konnte nicht abschließend erbracht werden. Im therapeutischen Bereich hat die untersuchte Applikationsform, auf Basis der bestehen Studienlage, ihre Anwendung gefunden und kann bedenkenlos verwendet werden. Für den Einsatz als unterstützendes Verfahren in der sportlichen Praxis besteht nach wie vor Bedarf an validen, randomisierten Studien, die die Wirksamkeit der Applikationsform auf psycho-physische Parameter von Athleten nachhaltig belegen, bevor sie in der sportlichen Praxis Anwendung finden sollten. / High performance requirements in competitive sports require the athlete a high level of aerobic fitness. The training opportunities and scopes intensities increase, are z.T. exhausted. To persist The attempt to find new ways to potential performance reserves additional market opportunities. Electrotherapy procedures have been in clinical practice, including to treatment of trauma, and are often proved for the purpose of analgesia, improvement of tissue perfusion and muscle stimulation applied. Their use in the field of adjuvant training support has so far been described only sporadically. In the present study, the effects were a electromagnetic application form on selected psycho-physical parameters examined (control group compared with placebo-controlled design) to statements about practical approaches to derive training support care. It turned the whether an intervention (15 x / 4 wk) with frequency currents in predominantly low-spectrum (0-10000Hz, 5 uA / cm ², CellVAS ®) to influence the parameters investigated, and so lead sustainable performance-enhancing or-reducing effects could be achieved. It should also be examined to what extent the parameters collected (PWC170, squat-jump, lateral flexion of the spine and SF36 ®) meaningful enough. The effectiveness of the application form was in the pre-post comparison before (T1), after (T2) and 4 wk) after (T3, sustainability of intervention analysis. The participants in the control group received similar applications in the placebo mode. The group consisted of healthy volunteers, athletes, whose endurance sports a high proportion of included (n = 127). The group allocation was partially randomizedin in main-(HG) and ontrol group (KG). In addition, the groups were additionally gender separately. In the course of the investigation could be changes for the performance parameters and PWC170 Squat Jump recognize. How far this Deviations on the impact of the intervention with frequency Due to currents in the low frequency spectrum are, could not be clarified clearly in this study. The effects could be detected by the underlying academic standards show not statistically valid. The scientific evidence of a possible change in performance could not be finally delivered. In the therapeutic range has examined the application form, are based on the Study location, found their application and can be safely used will. For use as a supportive procedure in the sports practice, there remains a need for valid, randomized studies evaluating the effectiveness of the application form on psycho-physical parameters of athletes demonstrate a sustained before Refer to the athletic practice should apply.

Det finns bristande tillgång på studier som undersökt Change of Direction Speed (CODS) och Repeated Sprint Ability (RSA) förmåga att förutspå fysisk prestation under match mätt med GPS-system. Syftet med studien var att undersöka två fälttester, 20 meter Repeated Sprint Ability test (RSA20) och Modifierat-Change of Direction Speed test (M-CODS) och dess samband till fysisk prestation under match: medeldistans (MD), acceleration (ACC), deceleration (DEC), högintensiva löpningar (HL), väldigt högintensiva löpningar (VHL), sprinter och maximal hastighet (MH) under matcher mätt med GPS-system (S5, 100Hz, CatapultSports, Australien). Under försäsongen utförde tio manliga elitfotbollsspelare (25.5±2.1 y/o, 78.8±3.6 kg,181.34±.9 cm) två fälttester som sedan jämfördes med fysisk prestation under match. Studien fann moderata signifikanta samband då p&lt;0.05 mellan bästa tiden på RSA20 (RSA20bäst) och accelerationer inkluderat med decelerationer (ACC+DEC) (r=-0.643) samt medeltiden på RSA20 (RSA20medel) och medelantalet sprinter (r=-0.638). Studiens slutsats var att de utförda fälttesterna inte bör användas i syfte att indikera prestation till följd av inre och yttre faktorers påverkan. / There is an inadequate amount of studies which have examined Change Of Direction Speed test (CODS) and Repeated Sprint Ability test (RSA) possibility to indicate match-related physical performance, measured with GPS-system. The aim of this study was to examine the relationship between two field test, 20 meter Repeated Sprint Ability (RSA20), Modified-Change of Direction Speed test (M-CODS) and match related physical performance: average distance (MD), acceleration (ACC), deceleration (DEC), high intensity running (HL),  very high intensity running (VHL), sprints and peak velocity (MH) during games recorded with GPS system (S5, 100Hz, MinimaxX, CatapultsSports, Australia). During the pre-season, ten Swedish male elite soccer players (25.5±2.1 y/o, 78.8±3.6 kg,181.34±.9 cm), completed the two field tests. The results of the two test were later compared and related to in-game physical match performance. This study found moderate significant relationships between best time on RSA20 (RSA20best) and acceleration added with deceleration (ACC+DEC) (r=-0.643) and sprints (r=-0.638). The conclusion of this study was that these analyzed field tests should not be used with the intention to indicate physical match related physical performance, due to the major influence of internal and external factors during gameplay.

O objeto deste trabalho é fornecer dados hidrológicos com fins de caracterização e monitoramento da região da Cadeia Norte do Brasil e da Cadeia de Fernando de Noronha, assim como levantar e sistematizar informações sobre a geoquímica dos diversos tipos de sedimentos encontrados na plataforma continental externa adjacente ao banco Aracati, contribuindo para o levantamento dos potenciais sustentáveis de exploração dos recursos vivos da Zona Econômica Exclusiva. A área em estudo compreende a sub-área II, setor 1 e parte do setor 2, e está localizada entre 1oN e 5oS de latitude e entre 30o e 40oW de longitude, abrangendo uma área de aproximadamente 400.000 km2. Foram analisadas amostras coletadas em 8 estações resultando em 20 amostras de sedimentos nos anos de 1997 (verão), 1998 (outono) e 2000 (primavera) e 34 estações que originaram 272 amostras de água na primavera de 2000. As concentrações máximas dos parâmetros analisados, com exceção do fosfato, nas amostras de água se localizam na região próxima à costa. Detectou-se na área uma termoclina bem marcada, sendo mais profunda na primavera. A camada de mistura é bastante homogênea, sendo porém, mais espessa na primavera. O pH detectado encontra-se na faixa alcalina sendo os maiores valores de pH detectados na primavera. Verifica-se, um máximo de salinidade na camada de inicio da termoclina sazonal. Não verificou-se na área condição anaeróbica na coluna d’água. A distribuição de fosfato, nitrato e silicato, apresenta-se de forma muito semelhante, sendo que na primavera essas concentrações são maiores, nas camadas superficiais. Na cobertura sedimentar da plataforma continental adjacente aos bancos da cadeia norte do Brasil, encontro-se areia quartzosa, areia carbonática, fragmentos de concha, Lithothanmium e Halimedas. Os fragmentos de concha apresentaram as maiores concentrações totais de metais, enquanto Lithothanmium apresentou o maior teor de carbonato. Há uma forte correlação entre ferro e manganês na amostras de água e em todas as frações de sedimentos analisadas, sendo que nestas a relação média entre estes elementos é da ordem de 1:25. Existe forte correlação entre cromo e carbonato nas amostras que apresentam teor de carbonato maior que 20%. As amostras de areia quartzosa, fragmentos de concha e Halimedas, apresentam-se muito semelhantes quanto à distribuição de ferro, manganês, zinco e cromo. Existe forte correlação nas amostras de sedimento, assim como nas amostras de água, entre ferro, manganês, zinco, correlacionando-se também nas amostras de sedimento com o chumbo. As 8 concentrações de metais nas amostras de água apresentaram-se relativamente baixas em se comparando com as amostras de sedimento. Nas amostras de água as concentrações de cromo e chumbo estão abaixo do limite de detecção. / The object of this work is to supply hidrologicals datas with ends of monitoramento of the area of the North Chain of Brazil and of the Chain of Fernando of Noronha, as well as to lift and to systematize information on the geochesmitry of the several types of sediments found in the external continental platform adjacent to the bank Aracati, contributing to the rising of the maintainable potentials of exploration of the alive resources of the Exclusive Economic Zone. The area in study understands the subarea II, section 1 and it leaves of the section 2, and it is located among 1oN and 5oS of latitude and among 30o and 40oW of longitude, embracing an area of approximately 400.000 km2. Samples collected in 8 stations resulting in 20 samples of sediments in the years of 1997 were analyzed (summer), 1998 (autumn) and 2000 (spring) and 34 stations that originated 272 samples of water in the spring of 2000. The maximum concentrations of the analyzed parameters, except for the phosphate, in the samples of water are located in the close area to the coast. It was detected in the area a very marked termocline, being deeper in the spring. The mixture layer is quite homogeneous, being even so, more it thickens in the spring. The detected pH meets in the alkaline strip being the largest pH values detected in the spring. It is verified, a maximum of salinity in the layer of I begin of the seasonal termoclina. It was not verified in the area anaerobic condition in the column of water. The distribution of phosphate, nitrate and silicate, come in a very similar way, and in the spring those concentrations are larger, in the superficial layers. In the sedimentary covering of the continental platform adjacent to the banks of the north chain of Brazil, find quartz sands, it sands carbonate, shell fragments, Lithothanmium and Halimedas. The shell fragments presented the largest total concentrations of metals, while Lithothanmium presented the largest text of carbonate. There is a strong correlation between iron and manganese in to samples of water and in all the analyzed fractions of sediments, and in these the medium relationship among these elements is of the order of 1:25. strong correlation Exists between chromium and carbonate in the samples that present text of larger carbonate than 20%. The samples of quartz sand, shell fragments and Halimedas, come very similar with relationship to the distribution of iron, manganese, zinc and chromium. Strong correlation exists in the sediment samples, as well as in the samples of water, among iron, manganese, zinc, being also correlated in the sediment samples with the lead. The concentrations 10 of metals in the samples of water came relatively low in if comparing with the sediment samples. In the samples of water the concentrations of chromium and lead are below the detection limit.