Artykuły w czasopismach: „Bore water”

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Lu, Senxun, Haijiang Liu i Xiaohu Deng. "An Experimental Study of the Run-Up Process of Breaking Bores Generated by Dam-Break Under Dry- and Wet-Bed Conditions". Journal of Earthquake and Tsunami 12, nr 02 (czerwiec 2018): 1840005. http://dx.doi.org/10.1142/s1793431118400055.

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In this study, a series of dam-break laboratory experiments were carried out to investigate the run-up process of breaking bores under dry- and wet-bed conditions. Detailed measurements were conducted to reveal differences in the run-up hydrodynamic characteristics under these two conditions, e.g. the bore front profile, the maximum run-up height and duration, and the instantaneous bore front velocity. Two successive bores were observed under the wet-bed run-up process, while multiple bores (three bores in general) were generated during the dry-bed run-up process due to the significant bottom friction effect. A linear relationship with the uniform gradient is found between the maximum run-up height and the initial water head for both dry- and wet-bed conditions, indicating that difference in the maximum run-up height between the dry- and specified wet-bed cases or among various wet-bed cases is not sensitive to the initial water head. Under the same initial water head, although the dry-bed run-up process takes a longer duration than that of wet-bed cases, the maximum run-up height is smallest for the dry-bed case and gradually increases with the increase of the initial downstream water depth for wet-bed cases. Under the wet-bed conditions, temporal variation of the bore front run-up velocity can be classified into two stages, i.e. the acceleration stage induced by the relatively large incident bore front water depth (large onshore hydrostatic pressure gradient) and the deceleration stage governed by the offshore-directed gravity force and bottom friction. Nevertheless, due to the small incident bore front water depth, run-up process under the dry-bed conditions does not show the acceleration stage.

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Draper, A. D. K., M. Mayo, G. Harrington, D. Karp, D. Yinfoo, L. Ward, A. Haslem, B. J. Currie i M. Kaestli. "Association of the Melioidosis Agent Burkholderia pseudomallei with Water Parameters in Rural Water Supplies in Northern Australia". Applied and Environmental Microbiology 76, nr 15 (11.06.2010): 5305–7. http://dx.doi.org/10.1128/aem.00287-10.

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ABSTRACT We analyzed water parameters and the occurrence of the melioidosis agent Burkholderia pseudomallei in 47 water bores in Northern Australia. B. pseudomallei was associated with soft, acidic bore water of low salinity but high iron levels. This finding aids in identifying water supplies at risk of contamination with this pathogenic bacterium.

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Wael Sulayman Miftah Ammar i Ying Shi. "The application of the KdV type equation in engineering simulation". Maejo International Journal of Energy and Environmental Communication 3, nr 2 (4.06.2021): 7–10. http://dx.doi.org/10.54279/mijeec.v3i2.245174.

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Bores propagating in shallow water transform into undular bores and, finally, into trains of solitons. The observed number and height of these undulations and later discrete solitons are strongly dependent on the propagation length of the bore. Empirical results show that the final height of the leading soliton in the far-field is twice the initial mean bore height. The complete disintegration of the initial bore into a train of solitons requires very long propagation, but unfortunately, these required distances are usually not available in experimental tests of nature. Therefore, the analysis of the bore decomposition for experimental data into solitons is complicated and requires different approaches. Previous studies have shown that by applying the nonlinear Fourier transform based on the Ko- rteweg–de Vries equation (KdV-NFT) to bores and long-period waves propagating in constant depth, the number and height of all solitons can be reliably predicted already based on the initial bore-shaped free surface. Against this background, this study presents the systematic analysis of the leading-soliton amplitudes for non-breaking and breaking bores with different strengths in different water depths to validate the KdV-NFT results for non-breaking bores to show the limitations of wave breaking on the spectral results. The analytical results are compared with data from experimental tests, numerical simulations and other approaches from the literature.

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Bernard, D., i H. Maillot. "Présence dans la ressource en eau potable d'éléments présentant des risques sanitaires : nickel, bore, plomb, pesticides". Journal européen d’hydrologie 31, nr 1 (2000): 11–24. http://dx.doi.org/10.1051/water/20003101011.

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McSweeney, Jacqueline M., James A. Lerczak, John A. Barth, Johannes Becherer, Jennifer A. MacKinnon, Amy F. Waterhouse, John A. Colosi i in. "Alongshore Variability of Shoaling Internal Bores on the Inner Shelf". Journal of Physical Oceanography 50, nr 10 (1.10.2020): 2965–81. http://dx.doi.org/10.1175/jpo-d-20-0090.1.

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AbstractTemperature and velocity measurements from 42 moorings were used to investigate the alongshore variability of nonlinear internal bores as they propagated across the central California inner shelf. Moorings were deployed September–October 2017 offshore of the Point Sal headland. Regional coverage was ~30 km alongshore and ~15 km across shore, spanning 9–100-m water depths. In addition to subtidal processes modulating regional stratification, internal bores generated complex spatiotemporal patterns of stratification variability. Internal bores were alongshore continuous on the order of tens of kilometers at the 50-m isobath, but the length scales of frontal continuity decreased to O(1 km) at the 25-m isobath. The depth-averaged, bandpass-filtered (from 3 min to 16 h) internal bore kinetic energy was found to be nonuniform along a bore front, even in the case of an alongshore-continuous bore. The pattern of along-bore variability varied for each bore, but a 2-week average indicated that was generally strongest around Point Sal. The stratification ahead of a bore influenced both the bore’s amplitude and cross-shore evolution. The data suggest that alongshore stratification gradients can cause a bore to evolve differently at various alongshore locations. Three potential bore fates were observed: 1) bores transiting intact to the 9-m isobath, 2) bores being overrun by faster, subsequent bores, leading to bore-merging events, and 3) bores disappearing when the upstream pycnocline was near or below middepth. Maps of hourly stratification at each mooring and the estimated position of sequential bores demonstrated that an individual internal bore can significantly impact the waveguide of the subsequent bore.

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Yeh, Harry H., Abdulhamid Ghazali i Ingunn Marton. "Experimental study of bore run-up". Journal of Fluid Mechanics 206 (wrzesień 1989): 563–78. http://dx.doi.org/10.1017/s0022112089002417.

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Bore propagation near the shoreline, the transition from bore to wave run-up, and the ensuing run-up motion on a uniformly sloping beach are investigated experimentally. As a bore approaches the shoreline, the propagation speed first decelerates by compressing its wave form and then suddenly accelerates at the shoreline. Although this behaviour is qualitatively in agreement with the inviscid shallow-water wave prediction (often called the ‘bore collapse’ phenomenon), unlike the genuine bore-collapse phenomenon, the acceleration is caused by the ‘momentum exchange’ process, i.e. collision of the bore against the initially quiescent water along the shoreline. Owing to this momentum exchange, a single bore motion degenerates into two successive run-up water masses; one involves a turbulent run-up water motion followed by the original incident wave motion. The transition process from undular bore to wave run-up appears to be different from that of a fully developed bore. The bore front overturns directly onto the dry beach surface, and the run-up is characterized by a thin splashed-up flow layer.

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Kishore, Gottam, Ranjay Kumar Singh, C. K. Saxena i Yogesh A. Rajwade. "Magnetic Treatment of Irrigation Water and its Influence on Radish (Raphanus sativus) crop: A Green Technology". Ecology, Environment and Conservation 28 (2022): 198–201. http://dx.doi.org/10.53550/eec.2022.v28i07s.032.

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Implementation of water treatment technologies for poor quality water may help reduce dependency on freshwater. One promising technology among water treatment technologies is magnetic water treatment (MWT). This study was aimed to evaluate the impact of bore water, hard water (1000 ppm) and saline water (electrical conductivity of 3 dS/m) on the plant biometric parameters and the yield of the radish. The water was treated in three stages: electrolysis, de-ionization and magnetization. In the pot culture experiment conducted, leaf length and leaf area index (LAI) was maximum under magnetized bore water treatment which was 22.7 cm and 6.2 compared to all other treatments respectively. The fresh weight (66.2 g) was highest in magnetically treated bore water, which was statistically significant over control. Among bore water treatments, the average yield per plant (48.5 t/ha) was maximum under magnetized bore water over control (43.9t/ha). Overall, the findings suggest that magnetically treated irrigation water positively influences plant growth parameters and the yield of radish.

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Arnason, Halldor, Catherine Petroff i Harry Yeh. "Tsunami Bore Impingement onto a Vertical Column". Journal of Disaster Research 4, nr 6 (1.12.2009): 391–403. http://dx.doi.org/10.20965/jdr.2009.p0391.

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In a laboratory wave tank, bores were generated by dam-break: by lifting a gate that initially separated quiescent shallow water from a volume of impounded water. The study was motivated by the problem of tsunami-structure interaction and sought to further the understanding of interactions between the bore-like flow of a broken tsunami wave and structures of different cross sections. Experiments were designed to observe the structure’s effect on the bore as well as the bore’s effect on the structure. This comprehensive study used highly repeatable experiments to measure water-surface variations, velocity flow fields, and forces exerted by bores on vertically erected columns. The temporal and spatial variations of the water-surface elevations were quantified with a Laser-Induced Fluorescence (LIF) technique; velocity flow fields were recorded with a combination of Laser Doppler Velocimeter (LDV) and Digital Particle Image Velocimetry (DPIV); forces on the columns were measured with a miniature load-cell transducer. The laboratory data obtained in the study are available for validating numerical models that predict forces on structures in unsteady flows.

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Haghi, Kevin R., i Dale R. Durran. "On the Dynamics of Atmospheric Bores". Journal of the Atmospheric Sciences 78, nr 1 (styczeń 2021): 313–27. http://dx.doi.org/10.1175/jas-d-20-0181.1.

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AbstractThe dynamics of a prototypical atmospheric bore are investigated through a series of two-dimensional numerical simulations and linear theory. These simulations demonstrate that the bore dynamics are inherently finite amplitude. Although the environment supports linear trapped waves, the supported waves propagate in roughly the opposite direction to that of the bore. Qualitative analysis of the Scorer parameter can therefore give misleading indications of the potential for wave trapping, and linear internal gravity wave dynamics do not govern the behavior of the bore. The presence of a layer of enhanced static stability below a deep layer of lower stability, as would be created by a nocturnal inversion, was not necessary for the development of a bore. The key environmental factor allowing bore propagation was the presence of a low-level jet directed opposite to the movement of the bore. Significant turbulence developed in the layer between the jet maximum and the surface, which reduced the low-level static stability behind the bore. Given the essential role of jets and thereby strong environmental wind shear, and given that idealized bores may persist in environments in which the static stability is constant with height, shallow-water dynamics do not appear to be quantitatively applicable to atmospheric bores propagating against low-level jets, although there are qualitative analogies.

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10

Guillaume, D. W., M. Norton i D. DeVries. "Dimensional considerations for small‐bore water manometers". Review of Scientific Instruments 60, nr 9 (wrzesień 1989): 3062–64. http://dx.doi.org/10.1063/1.1140604.

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McSweeney, Jacqueline M., James A. Lerczak, John A. Barth, Johannes Becherer, John A. Colosi, Jennifer A. MacKinnon, Jamie H. MacMahan, James N. Moum, Stephen D. Pierce i Amy F. Waterhouse. "Observations of Shoaling Nonlinear Internal Bores across the Central California Inner Shelf". Journal of Physical Oceanography 50, nr 1 (styczeń 2020): 111–32. http://dx.doi.org/10.1175/jpo-d-19-0125.1.

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AbstractWe present observations of shoaling nonlinear internal bores off the coast of central California. The dataset includes 15 moorings deployed during September–October 2017 and cross-shore shipboard surveys. We describe the cross-shore structure and evolution of large-amplitude internal bores as they transit from 9 km (100-m depth) to 1 km offshore (10 m). We observe that two bores arrive each semidiurnal period, both propagating from the southwest; of the total, 72% are tracked to the 10-m isobath. The bore speeds are subtidally modulated, but there is additional bore-to-bore speed variability that is unexplained by the upstream stratification. We quantify temporal and cross-shore variability of the waveguide (the background conditions through which bores propagate) by calculating the linear longwave nonrotating phase speed co and using the nonlinearity coefficient of the Korteweg–de Vries equation α as a metric for stratification. Bore fronts are generally steeper when α is positive and are more rarefied when α is negative, and we observe the bore’s leading edge to rarefy from a steep front when α is positive offshore and negative inshore. High-frequency α fluctuations, such as those nearshore driven by wind relaxations, contribute to bore-to-bore variability of the cross-shore evolution during similar subtidal waveguide conditions. We compare observed bore speeds with co and the rotating group velocities cg, concluding that observed speeds are always faster than cg and are slower than co at depths greater than 32 m and faster than co at depths of less than 32 m. The bores maintain a steady speed while transiting into shallower water, contrary to linear estimates that predict bores to slow.

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El, G. A., R. H. J. Grimshaw i W. K. Tiong. "Transformation of a shoaling undular bore". Journal of Fluid Mechanics 709 (24.08.2012): 371–95. http://dx.doi.org/10.1017/jfm.2012.338.

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AbstractWe consider the propagation of a shallow-water undular bore over a gentle monotonic bottom slope connecting two regions of constant depth, in the framework of the variable-coefficient Korteweg–de Vries equation. We show that, when the undular bore advances in the direction of decreasing depth, its interaction with the slowly varying topography results, apart from an adiabatic deformation of the bore itself, in the generation of a sequence of isolated solitons – an expanding large-amplitude modulated solitary wavetrain propagating ahead of the bore. Using nonlinear modulation theory we construct an asymptotic solution describing the formation and evolution of this solitary wavetrain. Our analytical solution is supported by direct numerical simulations. The presented analysis can be extended to other systems describing the propagation of undular bores (dispersive shock waves) in weakly non-uniform environments.

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Chuang, Wei-Liang, Kuang-An Chang, James Kaihatu, Rodrigo Cienfuegos i Cyril Mokrani. "EXPERIMENTAL MODELING OF TSUNAMI BORE IMPINGEMENT ON A SIMPLIFIED COASTAL BUILDING". Coastal Engineering Proceedings, nr 36 (30.12.2018): 43. http://dx.doi.org/10.9753/icce.v36.currents.43.

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Numerous laboratory efforts were devoted to improve our understanding to the process of tsunami wave-structure interaction and provide valuable data to validate numerical and analytical models. However, the highly turbulent and multiphase nature of tsunami bores makes the study of their impacts very challenging. Many experimental studies (e.g., Shafiei et al. 2016) employed wave gauges to measure the bore height and estimate the bore front velocity based on shallow water equations. Considering the complexity of the flow and its impact with structures, the conversion between the bore height and the bore velocity is far from straightforward. Therefore, this study attempts to apply the bubble image velocimetry (BIV, Ryu et al. 2005) technique to directly measure the flow velocities during the tsunami bore impact. A tsunami wave, that breaks on a sloping beach, propagates inland as a form of bore, and impinges on a rigid structure, is considered as the scenario of interest. The objective is to perform a comprehensive investigation on the borestructure interaction by examining the fluid velocity, impact pressure, and surge force during the impact event with various structure headings.

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Shugan, Igor, Hwung-Hweng Hwung i Ray-Yeng Yang. "TSUNAMI RUN-UP ON THE HORIZONTAL BEACH". Coastal Engineering Proceedings 1, nr 32 (23.01.2011): 10. http://dx.doi.org/10.9753/icce.v32.currents.10.

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Tsunami run-up on the flat horizontal beach is studied by using the Benney shallow water equations. The dam-breaking flow includes vortexes, vertical shear flow and dissipation of momentum and energy on the front due to bore breaking. Propagating of hydrodynamics bores with breaking is analyzed by the mass, momentum and energy relations on the shock wave. Non dissipative wave front propagates faster than classical bore, while taking into account the dissipation and wave breaking leads to slowing of the wave front.

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Zulaiha, Siti. "The utilization of chicken bone activated carbon as an adsorbent and its implementation in chemistry learning". CHEMPUBLISH JOURNAL 4, nr 1 (19.07.2019): 9–18. http://dx.doi.org/10.22437/chp.v4i1.6795.

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Brownish yellow is one of the characteristics of bore well water which indicates a high concentration of iron (Fe) that will affect human health and damage the aesthetic value. This study aims to purify the bore well water by reducing the concentration of Fe metal by adsorption of chicken bone activated carbon (CBAC) and implementing the results of research on the material of colloidal adsorption properties at Pekanbaru Telkom Vocational High School. CBAC is made through 3 steps namely dehydration at 50oC, carbonization at 400oC and activation with HCl, formic acid and NaOH pa. Each 1 gram of CBAC is mixed with the volume varied by 5; 10; 15; 20 and 25 ml. Measurements of Fe metal concentrations were carried out using Atomic Absorption Spectrophotometer (AAS) and the data obtained were then analyzed descriptively through tables and graphs. Maximum adsorption of CBAC was obtained in 20 ml of bore well water with a percentage reduction 99.92%. All results of treatment meet Fe metal quality standards as stipulated in Republic of Indonesia Minister of Health Regulation No. 416 of 1990. Analysis of student response questionnaires based on questionnaire analysis techniques obtained a cumulative value of 88.62% (very good).

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Bahri, Samsul, Budi Harlianto, Helfi Eka Saputra, Apriza Hongko Putra i Mardhatillah Sariyanti. "Analisis Faktor Abiotik Sumber Air Sumur di Lingkungan Kawasan Pesisir Pantai : Studi Kasus Kawasan Kampus Universitas Bengkulu". BIOEDUSAINS:Jurnal Pendidikan Biologi dan Sains 3, nr 2 (30.12.2020): 186–94. http://dx.doi.org/10.31539/bioedusains.v3i2.1774.

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University of Bengkulu is a communal area located on the west coast of Sumatra. The main water sources to support activities at UNIB come from shallow wells (dug) and deep wells (drilled). This study aims to analyze the physical and chemical parameters of dug and bore water wells in the environment of UNIB’s campus. Water quality testing for dug and bore wells includes several treatments. Water quality analysis using the Indonesian National Standard method. The results of water quality testing for dug and bore wells founded several physical and chemical parameters exceeding Class II water quality standards. The results of the testing of the quality of water in the TSS 1 dug well had exceeded the quality standard. The results of testing the quality of dug wells 1, 2, 3 and 4 pH and phosphate parameters had exceeded the quality standard. The results of testing the quality of dug 2 meter wells dug DHL had exceeded the quality standard. The results of the testing of the quality of water in a borehole 1 phosphate parameter had exceeded the quality standard. The results of water quality testing for boreholes 2 and 3 Fe parameters had exceeded the quality standard. Dug and bore well water sources in the UNIB environment can be used for drinking water, drinking freshwater fish, livestock, irrigating crops, and / or other purposes that require the same water quality as these uses. Keywords: Physical and Chemical Parameters, Deep Water, Shallow Water, Quality Standard

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S, Sujatha, i Sujitha K. "Physico Chemical Assessment of Bore Water in Muthupet Areas of Thiruvarur District, Tamil Nadu, India". International Journal of Trend in Scientific Research and Development Volume-2, Issue-6 (31.10.2018): 72–76. http://dx.doi.org/10.31142/ijtsrd18371.

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KLEMP, JOSEPH B., RICHARD ROTUNNO i WILLIAM C. SKAMAROCK. "On the propagation of internal bores". Journal of Fluid Mechanics 331 (25.01.1997): 81–106. http://dx.doi.org/10.1017/s0022112096003710.

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According to classical hydraulic theory, the energy losses within an external bore must occur within the expanding layer. However, the application of this theory to describe the propagation of internal bores leads to contradiction with accepted gravity-current behaviour in the limit as the depth of the expanding layer ahead of the bore becomes small. In seeking an improved expression for the propagation of internal bores, we have rederived the steady front condition for a bore in a two-layer Boussinesq fluid in a channel under the assumption that the energy loss occurs within the contracting layer. The resulting front condition is in good agreement with available laboratory data and numerical simulations, and has the appropriate behaviour in both the linear long-wave and gravity-current limits. Analysis of an idealized internal bore assuming localized turbulent stresses suggests that the energy within the expanding layer should, in fact, increase. Numerical simulations with a two-dimensional non-hydrostatic model also reveal a slight increase of energy within the expanding layer and suggest that the structure of internal bores is fundamentally different from classical external bores, having the opposite circulation and little turbulence in the vicinity of the leading edge. However, if there is strong shear near the interface between layers, the structure and propagation of internal jumps may become similar to their counterparts in classical hydraulic theory. The modified jump conditions for internal bores produce some significant alterations in the traditional Froude-number dependence of Boussinesq shallow-water flow over an obstacle owing to the altered behaviour of the upstream-propagating internal bore.

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D.P, Oparinde, Adesiyan A. A, Adesiyan O.F i Akiibinu O. Moses. "Comparison of Dissolved Metal Constituents of Borehole and Well Water in Osogbo Metropolis". JOURNAL OF ADVANCES IN CHEMISTRY 6, nr 3 (7.12.2010): 1072–76. http://dx.doi.org/10.24297/jac.v6i3.2644.

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Introduction: Water is considered safe for consumption only if the dissolved particles are not hazardous to health. This study evaluated and compared the concentrations of certain metals in water from bore-holes and wells in Osogbo metropolis. Methods: A total number of 36 boreholes and 36 wells from six different geographical zones of Osogbo were used for this study. The concentrations of calcium, magnesium, iron, manganese, copper, selenium, cobalt, cadmium, chromium, lead and zinc were determined in them using atomic absorption spectrophotometry method.Results: Concentrations of calcium, magnesium, and manganese, increased significantly (P<0.05) while the level of copper decreased significantly (P<0.05) in well-water when compared with bore hole-water. There were no significant differences (P>0.05) observed in the levels of iron and lead in well-water when compared with bore-hole water. Zinc, cadmium, chromium, selenium and cobalt were not detected in both water samples. Levels of Mg, Pb and Cu were higher in both well and bore hole waters of Osogbo metropolis when compared with the WHO standard for drinkable water.Conclusion: It could be concluded in this study that well water may contain more dissolved metals from the top soil. To avoid metal-induced toxicity, feasibility studies may be necessary to ensure that wells are not sited in areas where toxic materials have been deposited.

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Eka Subrata Jaya, I. W. Agus, I. Wayan Suarna i I. Wayan Redi Aryanta. "STUDI KUALITAS AIR TANAH DANGKAL DAN PENDAPAT MASYARAKAT SEKITAR TEMPAT PEMROSESAN AKHIR SAMPAH SUWUNG KECAMATAN DENPASAR SELATAN, KOTA DENPASAR". ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) 10, nr 1 (1.05.2016): 62. http://dx.doi.org/10.24843/ejes.2016.v10.i01.p10.

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Research has been conducted to determine the quality of shallow groundwater (dug-wells and shallow bore-wells) and the local communities opinions around the landfill Suwung. The method of determining the station was done by purposive sampling, where the station sampling was determined by selecting a place which was expected to represent the whole area.Water sampling of dug-wells was conducted by using a water sampler and the shallow bore-wells using a 2-liter bottle. Data was analyzed by descriptive comparative referenceto class I water quality of the Bali Governor Regulation No.8 of 2007. The public opinion data was obtained by using aquesioner filled by respondents who have and use wells and shallow bore wells for their daily needsand it was analyzed by using frequency distribution tables.The results showed that the quality of shallow groundwater (dug-wells and shallow bore-wells) did not meet water quality standards in accordance with the rules of the class defined in the Governor of Bali Regulation No. 8 of 2007. The water pollution index (PI) of dug-wells at a distance of 1-400 meters was in hearily polluted category, while water fromshallow bore-wells drilled at a distance of 1-200 meters was in the category of hearily polluted and at a distance of 201-400 meters was in the category of medium polluted.There was an increasing range of groundwater quality deterioration in 1997, 2008 and 2014. In 1997, contaminated shallow groundwater has occured at a distance of 80 meters, while in 2008, the pollution has occurred up to a distance of 375 meters and in the year of 2014 the contamination occurred from a distance of 1 meter to 400 meters. The average of score Pollution Index (PI) of Water wells in the year of 2008 amounted to 14.55, while in 2014 up to 15.44. It is estimated that the water quality of dug-wells and bore-wells will meet the quality standards in accordance with the value of the pollution index at a distance of over 5000 meters and 750 meters of the Suwung landfill waste.Most of the respondents who live in the vicinity Suwung landfill waste tend to give an opinion that the shallow groundwater (dug-wells and shallow bore-wells) has decreased quality as drinking water. Approximately 75% of respondents thought that the well water in their environment has been reduced in quality.

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Zhao, Jin Sheng, Tian Tai Li, Ming Zhang i Zhao Min Li. "Study the Displacement Characteristics of Foam Flooding after Polymer Flooding on NMR". Advanced Materials Research 361-363 (październik 2011): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.493.

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Through parallel cores with different permeability contrast, the displacement process of foam flooding after polymer flooding is experimental studied. Using the experiment technology of nuclear magnetic resonance, the fluid distribution in cores with different diameter was studied. The distribution area of bore diameter in which oil is sweepouted of water flooding, polymer flooding and foam flooding under different processes and various heterogeneity conditions. The results show, against water flooding and polymer flooding, the distribution area of bore diameter in which oil is sweepouted is broadened. Foam can plugging the wide aperture in which water and polyer channeling，and foam can sweep the bore diameter which can’t be swept by water and polymer. Foam can not only advance the recovery of low permeability core but also sweep the oil in microbore of high permeability core.

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Elsheikh, Nuri, Ioan Nistor, Amir H. Azimi i Abdolmajid Mohammadian. "Tsunami-Induced Bore Propagating over a Canal—Part 1: Laboratory Experiments and Numerical Validation". Fluids 7, nr 7 (22.06.2022): 213. http://dx.doi.org/10.3390/fluids7070213.

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This companion paper investigates the hydrodynamics of turbulent bores that propagate on a horizontal plane and have a striking resemblance to dam break waves and tsunami-like hydraulic bores. The focus of this paper is on the propagation of a turbulent bore over a mitigation canal using both laboratory experiments and numerical simulations. In the first part of this paper, the effects of canal depth on the time histories of wave height and velocity were experimentally investigated, and the experimental results were used for the validation of the numerical model. The rapid release of water from an impoundment reservoir at depths of do = 0.30 m and 0.40 m generated bores analogous to tsunami-induced inundations. The time histories of the wave heights and velocities were measured at 0.2 m upstream and at 0.2 m and 0.58 m downstream of the canal to study the energy dissipation effect of the mitigation canal. The recorded time series of the water surface levels and velocities were compared with simulation outputs, and good agreement was found between the experimental and numerical water surface profiles, with a Root Mean Square Error (RMSE) of less than 6.7% and a relative error of less than 8.4%. Three turbulence models, including the standard k-ε, Realizable k-ε, and RNG k-ε, were tested, and it was found that all these models performed well, with the standard k-ε model providing the highest accuracy. The velocity contour plots of the mitigation canal with different depths showed jet streams of different sizes in the shallow, medium-depth, and deep canals. The energy dissipation and air bubble entrainment of the bore as it plunged downward into the canal increased as the canal depth increased, and the jet stream of the maximum bore velocity decreased as the canal depth increased. It was found that the eye of the vortex created by the bore in the canal moved in the downstream direction and plunged downward in the middle of the canal, where it then began to separate into two smaller vortices.

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Balks, M. R., W. J. Bond i C. J. Smith. "Effects of sodium accumulation on soil physical properties under an effluent-irrigated plantation". Soil Research 36, nr 5 (1998): 821. http://dx.doi.org/10.1071/s97064.

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Effluent irrigation commonly results in increased soil sodicity, because of the medium-to-high salinity and high sodium concentrations of many effluents. The exchangeable sodium percentage (ESP) of soils at the Wagga Wagga Effluent Plantation Project increased from <2% to >25% at some depths within the surface 0·6 m of soil, after 5 seasons of irrigation with either (i) treated sewage effluent or (ii) bore water with similar salinity and sodium adsorption ratio (SAR). A survey of dispersion index (DI) and saturated hydraulic conductivity (Ksat) was carried out to investigate the effects of increased soil sodicity on soil physical properties. The Ksat was measured after 5 irrigation seasons at 2 depth intervals (0·15-0·45 m and 0·5-0·8 m) using both bore water and distilled water, and compared with measurements made at the same sites using bore water before irrigation commenced. Both DI and ESP were measured at each of 3 depths in the surface 0·6 m of soil. The DI in distilled water was positively correlated with ESP, with finer soil textures having higher DI for the same ESP. When measured in bore water or effluent, DI was very low and not related to ESP. Ksat was significantly lower after 5 irrigation seasons, and significantly lower in distilled water than in bore water. However, there was no relationship between Ksat and ESP. It was concluded that the increased ESP caused an increased tendency for soil dispersion but was not shown unequivocally to lead to decreased Ksat. The increased sodicity does not seem likely to affect continued use of the land for effluent irrigation, but may affect its suitability for alternative uses that involve physical disturbance of the soil, for example, by cultivation.

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Eucharista, Esther Isabella. "ASSESSMENT OFWATER QUALITY OF BORE HOLE WATER IN TIRUCHENDUR". International Journal of Research -GRANTHAALAYAH 4, nr 12 (31.12.2016): 124–31. http://dx.doi.org/10.29121/granthaalayah.v4.i12.2016.2400.

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The present study was carried out on the assessment of water quality index (WQI) of bore hole water in Tiruchendur. All the analysis was done by APHA (2012) method. Here the result pointed out that pH was recorded maximum as 7.16±0.03 during July and September 2016. TDS concentration was obtained high as 2400±2.000 mg/l during September 2016. TA content was noticed high as 688±2.51 mg/l during September 2016. TH range was high as 800±2.00 mg/l during August 2016. The concentration of Ca was recorded high as 200±1.53mg/l during August and September. All the parameters were exceeded the permissible limit of WHO except pH.pH had a positive relationship with TDS and TA and had a negative relationship with TH and Ca. TDS had a positive correlation with TA, TH and Ca. TA had a positive relationship with TH and CA. TH had a highly significant positive correlation with Ca. The bore hole water was not so good when compared with other South Indian bore hole water. The water quality index indicated that the water was highly polluted by the domestic effluents and sewage waste water. It was unfit for human consumption without treatment.

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Skene, D. M., L. G. Bennetts, M. Wright, M. H. Meylan i K. J. Maki. "Water wave overwash of a step". Journal of Fluid Mechanics 839 (29.01.2018): 293–312. http://dx.doi.org/10.1017/jfm.2017.857.

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Water wave overwash of a step by small steepness, regular incident waves is analysed using a computational fluid dynamics (CFD) model and a mathematical model, in two spatial dimensions. The CFD model is based on the two-phase, incompressible Navier–Stokes equations, and the mathematical model is based on the coupled potential-flow and nonlinear shallow-water theories. The CFD model is shown to predict vortices, breaking and overturning in the region where overwash is generated, and that the overwash develops into fast-travelling bores. The mathematical model is shown to predict bore heights and velocities that agree with the CFD model, despite neglecting the complicated dynamics where the overwash is generated. Evidence is provided to explain the agreement in terms of the underlying agreement of mass and energy fluxes.

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St-Germain, Philippe, Ioan Nistor i Ronald Townsend. "NUMERICAL MODELING OF TSUNAMI-INDUCED HYDRODYNAMIC FORCES ON ONSHORE STRUCTURES USING SPH". Coastal Engineering Proceedings 1, nr 33 (15.12.2012): 81. http://dx.doi.org/10.9753/icce.v33.structures.81.

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In this paper, the simulation of the violent impact of tsunami-like bores with a square column is performed using a single-phase, weakly compressible three-dimensional Smoothed Particle Hydrodynamics (SPH) model. In order to avoid large fluctuations in the pressure field and to obtain accurate simulations of the hydrodynamic forces, a Riemann solver-based formulation of the SPH method is utilized. Large-scale physical experiments conducted by the authors are reproduced using the numerical model. Time-histories of the water surface elevation as well as time-histories of the pressure distribution and net total force acting on the column are successfully compared. As observed in previous breaking wave impact studies, results show that the magnitude and duration of the impulsive force at initial bore impact depend on the degree of entrapped air in the bore-front. Although ensuring a stable pressure field, the Riemann solver-based SPH scheme is believed to induce excessive numerical diffusion, as sudden and large water surface deformations, such as splashing at initial bore impact, are marginally reproduced. To investigate this particular issue, the small-scale physical experiment of Kleefsman et al. (2005) is also considered and modeled.

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Humphrey, Neil, i Keith Echelmeyer. "Hot-water Drilling And Bore-hole Closure In Cold Ice". Journal of Glaciology 36, nr 124 (1990): 287–98. http://dx.doi.org/10.3189/002214390793701354.

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AbstractDrilling bore holes in deep, cold ice masses by hot-water methods and maintaining these holes with sufficient diameter to allow down-hole experimentation poses a major obstacle to the investigation of conditions beneath ice sheets and ice streams. Closure of the water-filled holes by refreezing is the dominant difficulty. In this paper, we describe calculations of heat transfer from the drilling system to the ice and the subsequent time-dependent motion of the phase boundary defining the bore-hole wall. Results are presented with the view of optimizing the bore-hole radius at depth for a fixed drill performance and a variable rate of drilling.Calculation of melting/refreezing rates at the bore-hole wall requires the use of a one-dimensional, time-dependent numerical heat-flow model with a distorting mesh which follows the changing hole size. The delay of hole closure is discussed with a view to keeping holes open long enough to allow instruments to be lowered to the glacier bed, while realizing that drilling-system performance may be marginal because of logisitical and/or expenditure constraints. The relative merits of drilling a large hole, which is very time consuming with a small drill, and the use of water-soluble antifreezes, which have a history of creating plugs of ice slush, are discussed. A method of creating a stable hole filled with antifreeze in which ice slush does not occur is described.The recent application of these theoretical ideas to the planning and implementation of successful hot-water drilling programs in Antarctica and Greenland is also presented.

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Yeh, Harry H. "Tsunami bore runup". Natural Hazards 4, nr 2-3 (1991): 209–20. http://dx.doi.org/10.1007/bf00162788.

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McRobb, Evan, Derek S. Sarovich, Erin P. Price, Brian G. Spratt, Daniel Godoy, Bart J. Currie, Mark Mayo i Mirjam Kaestli. "Melioidosis from Contaminated Bore Water and Successful UV Sterilization". American Journal of Tropical Medicine and Hygiene 89, nr 2 (7.08.2013): 367–68. http://dx.doi.org/10.4269/ajtmh.13-0101.

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L. Bona, Jerry, Thierry Colin i Colette Guillopé. "Propagation of long-crested water waves. Ⅱ. Bore propagation". Discrete & Continuous Dynamical Systems - A 39, nr 10 (2019): 5543–69. http://dx.doi.org/10.3934/dcds.2019244.

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Kataria, H. C., i Shahila Bux. "Anaylysis of drinking bore well’s water of Bhopal (M.P.)". Current World Environment 3, nr 2 (20.12.2008): 317–20. http://dx.doi.org/10.12944/cwe.3.2.20.

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Ozdemir, O., E. Taran, M. A. Hampton, S. I. Karakashev i A. V. Nguyen. "Surface chemistry aspects of coal flotation in bore water". International Journal of Mineral Processing 92, nr 3-4 (sierpień 2009): 177–83. http://dx.doi.org/10.1016/j.minpro.2009.04.001.

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Cogswell, Duncan. "Wireline logging: cost effective methods for new water bore certification and old leaky bore rehabilitation assessment". ASEG Extended Abstracts 2016, nr 1 (grudzień 2016): 1. http://dx.doi.org/10.1071/aseg2016ab1001.

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Loveless, David M., Timothy J. Wagner, David D. Turner, Steven A. Ackerman i Wayne F. Feltz. "A Composite Perspective on Bore Passages during the PECAN Campaign". Monthly Weather Review 147, nr 4 (1.04.2019): 1395–413. http://dx.doi.org/10.1175/mwr-d-18-0291.1.

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Abstract Atmospheric bores have been shown to have a role in the initiation and maintenance of elevated convection. Previous observational studies of bores have been case studies of more notable events. However, this creates a selection bias toward extraordinary cases, while discussions of the differences between bores that favor convective initiation and maintenance and bores that do not are lacking from the literature. This study attempts to fill that gap by analyzing a high-temporal-resolution thermodynamic profile composite of eight bores observed by multiple platforms during the Plains Elevated Convection at Night (PECAN) campaign in order to assess the impact of bores on the environment. The time–height cross section of the potential temperature composite displays quasi-permanent parcel displacements up to 900 m with the bore passage. Low-level lifting is shown to weaken the capping inversion and reduce convective inhibition (CIN) and the level of free convection (LFC). Additionally, low-level water vapor increases by about 1 g kg−1 in the composite mean. By assessing variability across the eight cases, it is shown that increases in low-level water vapor result in increases to convective available potential energy (CAPE), while drying results in decreased CAPE. Most cases resulted in decreased CIN and LFC height with the bore passage, but only some cases resulted in increased CAPE. This suggests that bores will increase the potential for convective initiation, but future research should be directed toward better understanding cases that result in increased CAPE as those are the types of bores that will increase severity of convection.

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Deepak S. Patil, Sadashiv D. Nimbalkar. "Performance of Yield and Nutritional Quality of Azolla pinnata Cultivated under Different Water Sources". International Journal of Current Microbiology and Applied Sciences 10, nr 12 (10.12.2021): 36–42. http://dx.doi.org/10.20546/ijcmas.2021.1012.006.

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The performance of yield and nutritional quality of Azolla pinnata cultivated in different water sources like Well water, River water, Bore well, Sewage water and Drainage (water-House) was shows that there is no significant change in yield between the treatments, however, higher yield of 32 kg fresh Azolla pinnata was observed in river water (T2) and lowest yield of 23.49kg in Bore well water (T3). Secondly, no significant change in crude protein content between the treatments but highest value of 28.44% in Sewage water (T4) with an average value of 25.86% is record. The increased fresh Azolla yield and protein content may be due to lower total dissolved solids, total hardness as CaCo3 and higher in Phosphate availability in the water.

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Malik, D. S., i Pawan Kumar. "Multivariate analysis of drinking water quality parameters around Gajraula industrial area, India". Environment Conservation Journal 11, nr 3 (24.12.2010): 89–93. http://dx.doi.org/10.36953/ecj.2010.110317.

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The present study aims at identifying the ground water contamination problem in the vicinity of Gajraula industrial area at Gajraula (U.P.), India. Ground water samples were collected by hand pumps and bore well, based on the depth of 40 and 120 feet of water table respectively. Analytical techniques were adopted in the standard methods for examination of drinking water quality in ground water samples and results compared with the standards given by WHO and BIS guidelines for drinking water quality. The physico-chemical parameters like conductivity, TDS, Alkalinity, Ca, Mg-hardness and COD were recorded higher ranges in comparison to standard values. The present study showed that drinking water quality of bore well water found slightly better than water of hand pumps.

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Ramana, D. V., A. Chelani, R. K. Chadha i R. N. Singh. "Deep bore well water level fluctuations in the Koyna region, India: the presence of a low order dynamical system in a seismically active environment". Nonlinear Processes in Geophysics 16, nr 3 (11.05.2009): 393–97. http://dx.doi.org/10.5194/npg-16-393-2009.

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Abstract. Water level fluctuations in deep bore wells in the vicinity of seismically active Koyna region in western India provides an opportunity to understand the causative mechanism underlying reservoir-triggered earthquakes. As the crustal porous rocks behave nonlinearly, their characteristics can be obtained by analysing water level fluctuations, which reflect an integrated response of the medium. A Fractal dimension is one such measure of nonlinear characteristics of porous rock as observed in water level data from the Koyna region. It is inferred in our study that a low nonlinear dynamical system with three variables can predict the water level fluctuations in bore wells.

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38

El-Bagoury, Mohamed. "Integrated petrophysical study to validate water saturation from well logs in Bahariya Shaley Sand Reservoirs, case study from Abu Gharadig Basin, Egypt". Journal of Petroleum Exploration and Production Technology 10, nr 8 (18.08.2020): 3139–55. http://dx.doi.org/10.1007/s13202-020-00969-3.

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Abstract Water saturation is a key parameter in evaluating oil and gas reservoirs and calculating OIIP and GIIP for petroleum fields. The late Cretaceous Bahariya reservoir contains variable amounts of clay minerals. Bore hole logs are affected with those clay minerals particularly the density and resistivity logs. Several methods are acknowledged to determine the true water saturation from well logs in shaley sand reservoirs. Each method assumes a sort of corrections to amount of shale distributed in the reservoir. The scope of this petrophysical study is to integrate core analysis and bore hole logs to investigate the characteristics of water saturation in the Bahariya reservoirs. Comparison between most of the significant shaley sand methods is presented in this research. Reservoir lithology and mineralogy are explained by Elan-model while bore hole images are used for fine-tuning the electrofacies. Siltstone, shaley sand and clean sandstones are the main electrofacies that is characterizing the Bahariya reservoir rocks. For accurate saturation results, some core samples have been used for validating the log-derived water saturation. Dean stark and cation exchange capacity experiments are integrated with bore hole logs to calculate the error in water saturation for each method for best calibration. The successful integration between logs and core measurements led to convenient log evaluation and accurate understanding for the Bahariya reservoir in the prospective part of Abu Gharadig basin.

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MV Reena, A Amalraj, R Ajitha i C Nirmala Louis. "Cluster analysis of water quality parameters of water samples from Colachel to Melmidalam in Kanyakumari district". International Journal of Science and Research Archive 7, nr 2 (30.11.2022): 269–85. http://dx.doi.org/10.30574/ijsra.2022.7.2.0234.

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A methodical study has been carried out to explore physico-chemical parameters of drinking water from well and bore hole in and around the villages from Colachel to Melmidalam of Kanyakumari District. Water samples from well and bore hole in four sites namely Colachel, Kurumbanai, Midalam, Melmidalam were collected in pre monsoon and post monsoon seasons during 2019 ad 2020 and analyzed for temperature, sodium, potassium and oxidation & reduction potential. pH, turbidity, alkalinity, hardness, salinity, fluoride, chloride, total dissolved solids, dissolved oxygen, BOD, electrical conductivity, total nitrogen, nitrate, sulphate, ammonia, phosphate, total phosphorus. The physico-chemical parameters were analyzed and the results were compared with water quality standards described by WHO. Statistical techniques, calculation of basic statistics, Correlation matrix, and Hierarchical Cluster analysis were simultaneously applied to the physico-chemical parameters of water samples taken from in different sites. The above study will be useful to know the water quality and their fitness for drinking purposes at various stations undertaken. Overall water quality was found satisfactory for drinking purpose without prior treatment.

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Shanmugam, C. Jothi. "Minimizing of Rejection in Cylinder Head Machining Using the Anova Method". Applied Mechanics and Materials 766-767 (czerwiec 2015): 935–40. http://dx.doi.org/10.4028/www.scientific.net/amm.766-767.935.

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The main rejections in the machining sections are exhaust valve port leak, injector bore blow hole, induction passage punchered, inlet valve port leak, top face unwash, valve guide hole blow hole, top face leak, joint face unwash, induction face unwash, rear face unwash, valve port unwash, water mixing with oil., water passage blocked, emf leak, injector bore leak, inlet valve port blocked, water way leak, oil way leak and defective jig location pad. This paper describes the method by which the rejections while maching the cylinder head, is minimized.

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Demoz, B. B., D. O’C Starr, K. D. Evans, A. R. Lare, D. N. Whiteman, G. Schwemmer, R. A. Ferrare, J. E. M. Goldsmith i S. E. Bisson. "The Cold Front of 15 April 1994 over the Central United States. Part I: Observations". Monthly Weather Review 133, nr 6 (1.06.2005): 1525–43. http://dx.doi.org/10.1175/mwr2932.1.

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Abstract Detailed observations of the interactions of a cold front and a dryline over the central United States that led to dramatic undulations in the boundary layer, including an undular bore, are investigated using high-resolution water vapor mixing ratio profiles measured by Raman lidars. The lidar-derived water vapor mixing ratio profiles revealed the complex interaction between a dryline and a cold-frontal system. An elevated, well-mixed, and deep midtropospheric layer, as well as a sharp transition (between 5- and 6-km altitude) to a drier region aloft, was observed. The moisture oscillations due to the undular bore and the mixing of the prefrontal air mass with the cold air at the frontal surface are all well depicted. The enhanced precipitable water vapor and roll clouds, the undulations associated with the bore, the strong vertical circulation and mixing that led to the increase in the depth of the low-level moist layer, and the subsequent lifting of this moist layer by the cold-frontal surface, as well as the feeder flow behind the cold front, are clearly indicated. A synthesis of the Raman lidar–measured water vapor mixing ratio profiles, satellite, radiometer, tower, and Oklahoma Mesonet data indicated that the undular bore was triggered by the approaching cold front and propagated south-southeastward. The observed and calculated bore speeds were in reasonable agreement. Wave-ducting analysis showed that favorable wave-trapping mechanisms existed; a low-level stable layer capped by an inversion, a well-mixed midtropospheric layer, and wind curvature from a low-level jet were found.

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Panggei, Yahja, Meike Lisangan i Zita L. Sarungallo. "Tinjauan kualitas air bersih di Rumah Sakit Umum Manokwari". Cassowary 6, nr 1 (23.01.2023): 39–45. http://dx.doi.org/10.30862/casssowary.cs.v6.i1.138.

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The aim of this research was to study the quality standards of clean water in Manokwari Hospital based on physical, biological and chemical parameters. This research was conducted using a descriptive method, with a quantitative approach. The results of this study indicate that in terms of biological parameters, there are 5 sample points in bore well 1 and 1 sample point in bore well 2 with total coliform that exceeds the quality standard and the main reservoir contains E. coli. Based on physical parameters, both sources of clean water (bore well 1 and well 2) meet quality standards. Meanwhile, based on chemical parameters, there were 3 chemical elements in drilled well 1 and 1 chemical element in drilled well 2 which did not meet the standard. The clean water management system that has been implemented has not run according to regulations, both in terms of supervision, completeness of personnel and job training. Conditions of scale accumulation were found to occur in water taps, water tanks, installation pipes, pumping machines and floors of bedrooms and toilets, due to the high hardness of the available clean water.

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Maqtan, Raidan, Badronnisa Yusuf i Saiful Bahri Hamzah. "Physical Modeling of Landward Scour Due to Tsunami Bore Overtopping Seawall". MATEC Web of Conferences 203 (2018): 01003. http://dx.doi.org/10.1051/matecconf/201820301003.

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many of the post tsunami field surveys which conducted by researchers revealed that, the failure due to scour at the landward toe of the seawall due to overtopping of tsunami wave forms one of the important types of coastal defence structures failure and constitutes one of the biggest threats to their structural performance. This study was intended to investigates the scour profile induced by tsunami bores at the landward toe of the vertical seawall and to discuss the effects of the parameters; tide level, incident bore Froude number Fb, incident bore height Hb, overtopping flow Froude number Fo, and overtopping flow depth Ho on the maximum scour depth induced at the landward toe of the seawall. A set of laboratory experiments were conducted at National Hydraulic Research Institute of Malaysia (NAHRIM) with the tichnique of dam break to generate the bore like tsunami. The experiments showed that the initial water level upstream of the seawall has a significant effect on the scour profile and there is a strong negative relationship exists with Froude number of the incident bore and a strong positive relationship exists with Froude number of the overtopping flow depth above the crest of the seawall.

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44

Mcneal, Timothy P., i Henry C. Hollifield. "Quantitative Multiresidue Analyses for Volatile Organics in Water and Milk, Using a Fused Silica Open-Tubular Wide-Bore Capillary Column and Automated Headspace Gas Chromatography". Journal of AOAC INTERNATIONAL 73, nr 2 (1.03.1990): 328–31. http://dx.doi.org/10.1093/jaoac/73.2.328.

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Abstract A modified multiresidue capillary gas chromatographic (GC) procedure has been developed using automated headspace sampling and a wide-bore fused silica open-tubular (FSOT) capillary column for the determination of volatiles in water and milk. Compounds are quantltated by the method of standard additions. An IBM System 9000 computer with the CAPMC3 chromatographic applications package and a BASIC linear regression program are used for data reduction. Data are presented for solutions prepared by fortifying water and milk with volatile solvents such as acetone, methyl ethyl ketone, benzene, methylene chloride, and chloroform, which are commonly used in the manufacture of packaging materials and adheslves. The wide-bore FSOT capillary columns showed dramatically improved detection for certain compounds, compared with normal-bore capillary GC columns. Data presented for various chemicals demonstrate the improved limits of detection from the use of automated headspace gas chromatography with wide-bore capillary columns and flame ionization detection.

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Damodharan, Usha, i M. Vikram Reddy. "Uptake of Toxic Trace Metals (Cd, Pb) and Micro Nutrients (Cu, Zn, Mn) by Sugarcane (Saccharum Officinarum L.) Irrigated with Treated Effluents of Sugar Industry". Archives of Environmental Protection 40, nr 1 (1.03.2014): 13–22. http://dx.doi.org/10.2478/aep-2014-0009.

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Abstract The accumulation and translocation of trace metals in soil and in sugarcane crop irrigated with treated effluents from sugar industry compared to soil and sugarcane crop irrigated with bore-well water were determined. In the present study the impact of irrigation with treated effluent from the sugar industry on the trace metal contamination of sugarcane juice was assessed. It revealed that the mean concentrations of Cd, Pb, Cu, Mn and Zn in the soil of fields irrigated with effluent and in juice from sugarcane grown on such fields were higher than those from bore-well water irrigated fields. The concentrations of trace metals in treated effluent exceeded the permissible limits of the Indian standards (Central Pollution Control Board-2000). The concentrations of Cd, Pb, Cu and Zn in juice of sugarcane grown on fields irrigated with effluent also exceeded the permissible limits of Indian standards and WHO/FAO expert committee recommendations. Their concentrations in juice of sugarcane grown in fields irrigated with bore-well water were within the limits of safety, except for Cd. The transfer factor for Zn was considerably higher than those of the other trace metals. The metal concentrations of sugarcane juice showed significant correlations with those of soil, which was not the case when bore well water was used for irrigation.

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Rajankar, P. N., S. R. Gulhane, D. H. Tambekar, D. S. Ramteke i S. R. Wate. "Water Quality Assessment of Groundwater Resources in Nagpur Region (India) Based on WQI". E-Journal of Chemistry 6, nr 3 (2009): 905–8. http://dx.doi.org/10.1155/2009/971242.

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Water quality index (WQI) has been calculated for different groundwater sourcesi.e. dug wells, bore wells and tube wells at Khaperkheda region, Maharashtra (India). Twenty two different sites were selected in post monsoon, winter and summer season. And water quality index was calculated using water quality index calculator given by National Sanitation Foundation (NSF) information system. The calculated WQI showed fair water quality rating in post monsoon season which then changed to medium in summer and winter seasons for dug wells, but the bore wells and hand pumps showed medium water quality rating in all seasons where the quality was slightly differs in summer and winter season than post monsoon season, so the reasons to import water quality change and measures to be taken up in terms of groundwater quality management are required.

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Mwakalila, Shatdrack. "Socio-Economic Impacts of Water Scarcity in Dar es Salaam, Tanzania". Tanzania Journal of Engineering and Technology 30, nr 1 (30.06.2007): 58–64. http://dx.doi.org/10.52339/tjet.v30i1.397.

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Drought and the resulting low water levels in rivers exacerbate water scarcity conditions in Dar es Salaam city. Theresult is frequent water rationing in areas served with piped water, sometimes for days or weeks, and low water pressure,which leads residents to resort to other less safe and sometimes more expensive water sources. The frequent and currentresponse to the inadequate piped water supply in Dar es Salaam has been the use of groundwater resources. There areboth public and private bore-holes and wells drilling companies in Dar es Salaam.. This paper therefore, presents somesocio-economic impacts of water scarcity in Dar es Salaam city. The methodology employed in field data andinformation collection includes interviews, questionnaire, focus group discussions and participatory observation. This isdata triangulation, an essential technique for improving the reliability of data and information. The study reveals that theparticipation of local community (including water vendors and private business entrepreneurs) in water delivery systemsthrough drilling bore-holes and shallow wells has improved water supplies in the study areas. However, the study hasrevealed some problems related to water scarcity in Dar es Salaam. These include high prices for water, poor sanitationand hygiene, unsafe and unclean water and inconvenient payment systems. Poor sanitation is related to stagnant wateraround the bore-holes and shallow wells. It is noted that unsafe water is mainly a problem for those obtaining water fromwater vendors and/or hire young men to collect water for household uses. However, the study concludes that individual’sparticipation in water delivery systems in Dar es Salaam City has positively improved the life standards of the localpeople, particularly the poor.

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Bernardo, Paola, Franco Tasselli i Gabriele Clarizia. "Hollow Fiber Polyimide Membranes Prepared in a Triple Orifice Spinneret: Effect of a Reduced Water Activity in the Bore Fluid on the Gas Separation Performance". Polymers 13, nr 13 (4.07.2021): 2211. http://dx.doi.org/10.3390/polym13132211.

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Polyimide-based hollow fibers were spun using a triple orifice spinneret in order to apply them in gas separation. The membrane structure was tailored producing a porous external layer and a thin internal skin layer, that controlled the gas transport. The measurement of gas permeation rates and the morphological analysis were combined to obtain information on the performance of the membranes. The aim was to tune the inner top layer and investigate the role of the bore fluid on the gas permeation properties of the membranes. The bore fluid composition was explored by using water mixtures containing the solvent used for preparing the dope solution or a salt in order to reduce the water activity in the inner coagulant, but also a low amount of a crosslinker for improving the gas selectivity. The change of the dope flow-rate was also analyzed. At moderate dope flow-rates, the use of a saline water solution as bore fluid is more effective in enhancing the membrane gas selectivity with respect to a bore fluid containing certain amounts of solvent. This option represents a green approach for the preparation of the membrane. The behavior of the prepared hollow fibers over time (physical aging) in gas permeation was discussed.

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Sarkar, Sanjay, Gouri Sarkar i Kalipada Sarkar. "Physico-chemical Analysis of Bore-well Water of Malda District". RESEARCH REVIEW International Journal of Multidisciplinary 5, nr 12 (14.12.2020): 113–16. http://dx.doi.org/10.31305/rrijm.2020.v05.i12.022.

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Mayo, Mark. "Burkholderia pseudomallei in Unchlorinated Domestic Bore Water, Tropical Northern Australia". Emerging Infectious Diseases 17, nr 7 (lipiec 2011): 1283–85. http://dx.doi.org/10.3201/eid1707.100614.

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Artykuły w czasopismach na temat „Bore water”

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