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Letteratura scientifica selezionata sul tema "Hydrochemical modeling"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Hydrochemical modeling"

Dzombak, David A., e M. Ashraf Ali. "Hydrochemical Modeling of Metal Fate and Transport in Freshwater Environments". Water Quality Research Journal 28, n. 1 (1 febbraio 1993): 7–50. http://dx.doi.org/10.2166/wqrj.1993.003.

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Abstract During the last decade there has been growing interest in the development of hydrochemical models (coupled transport-chemistry-biology models) for better understanding and, eventually, for predicting the fate and transport of metals in freshwater environments. While there has been much discussion of such models and their submodels, and detailed examinations of the mechanistic descriptions and mathematics involved in their formulation, there has been relatively little attention focused on how well they perform in describing field data. This paper provides a look at the state-of-the art in hydrochemical modeling of metal fate and transport in groundwater, riverine and lacustrine systems through review of reported model validation attempts. Focus is on those models that have been applied to describe field data; the degree of success achieved and related factors are examined. Key observations drawn from our review of available hydrochemical models and attempted applications to field data are as follows: (1) most existing models consider steady one-dimensional flow only; (2) most existing models consider only one or a few chemical reaction mechanisms, with sorption-desorption being the most common; (3) local equilibrium is assumed in most models, though kinetic formulations for some chemical processes have been incorporated in some models; and (4) interaction of metals with biota have been considered in only a few models and in a very simplified manner. The most advanced hydrochemical models for metal fate and transport appear to be those for groundwater systems, followed in order by those for rivers and lakes. From a larger perspective, however, hydrochemical models for metals are still at an early stage of development for all freshwater environments.

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Пичугина, Анна Игоревна, e Ирина Геннадьевна Критова. "MODELING OF HYDROCHEMICAL OXIDATION OF HEAZLEWOODITE WITH NITRIC ACID". Вестник Тверского государственного университета. Серия: Химия, n. 3(41) (10 novembre 2020): 65–72. http://dx.doi.org/10.26456/vtchem2020.3.7.

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В работе представлены результаты математического моделирования окислительного растворения хизлевудита в растворах азотной кислоты в условиях равнодоступной поверхности вращающегося диска с применением метода полного факторного эксперимента. Получены и проанализированы зависимости скорости процесса гидрохимического окисления сульфида никеля (W, моль/смс) от продолжительности взаимодействия (τ, с), влияния концентрации азотной кислоты (С, моль/дм), частоты вращения диска (ω, с) и температуры (Т, К). Определены основные кинетические параметры: константа скорости и эффективная энергия активации процесса. Установлены режимы взаимодействия хизлевудита с азотной кислотой, выявлены вероятные лимитирующие стадии взаимодействия. The paper presents the results of mathematical modeling of the oxidative dissolution of hizlewudite in solutions of nitric acid using the rotating disk method and the factor experimental design. The dependences of specific speed of dissolution of sulfide of nickel Nickel sulfide (W, mol/cmc) on the duration of interaction (τ, s), the influence of nitric acid concentration (C, mol/dm), frequencies of rotation disk (ω, s) and temperatures (T, K) were obtained and analyzed. The main kinetic parameters are determined: the rate constant and the activation energy of the process. Established modes of interaction heazlewoodite with nitric acid, identified probable limiting stage of the interaction.

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Yang, Nuan, Guangcai Wang, Zheming Shi, Dan Zhao, Wanjun Jiang, Liang Guo, Fu Liao e Pengpeng Zhou. "Application of Multiple Approaches to Investigate the Hydrochemistry Evolution of Groundwater in an Arid Region: Nomhon, Northwestern China". Water 10, n. 11 (16 novembre 2018): 1667. http://dx.doi.org/10.3390/w10111667.

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Groundwater is a critical water resource for human survival and economic development in arid and semi-arid areas. It is crucial to understand the groundwater circulation and hydrochemical evolution for sustainable management and utilization of groundwater resources in those areas. To this end, an investigation of the hydrochemical characteristics of surface water and groundwater was conducted in Nomhon, an arid area located in the Qaidam Basin, northwest China, by using hydrochemical (major and trace elements) and stable isotopes (δD and δ18O) approaches. Stable isotopes and ion ratios were analyzed to determine the recharge sources, hydrochemistry characteristics, and major hydrogeochemical processes. Meanwhile, inverse geochemistry modeling was applied to quantitatively determine the mass transfer of hydrogeochemical processes. The results showed that groundwater in the study area is mainly recharged by atmospheric precipitation in mountainous areas, and the groundwater in the center of basin might originate from ancient water in cold and humid environments. Along the groundwater flow path, the TDS of groundwater increased gradually from fresh to salty (ranging from 462.50 to 19,604.40 mg/L), and the hydrochemical type changed from Cl·HCO3–Na·Mg·Ca to Cl–Na. Groundwater chemical composition and mass balance modeling results indicated that from alluvial fan to lacustrine plain, the main hydrogeochemical processes changed from the dissolution of halite and albite and the precipitation of dolomite and kaolinite to the dissolution of halite and gypsum, precipitation of calcite, redox (SO42− reduction), and cation exchange. This study would be helpful for water resources management in this area and other similar areas.

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Korshenko, A. N., A. R. Alyautdinov e L. A. Ushakova. "MODELING AND ANALYSIS OF SPATIAL HYDROCHEMICAL STATE OF NEVA BAY WATERS". Proceedings of the International conference “InterCarto/InterGIS” 1, n. 22 (1 gennaio 2016): 120–27. http://dx.doi.org/10.24057/2414-9179-2016-1-22-120-127.

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El Alfy, Mohamed. "Hydrochemical Modeling and Assessment of Groundwater Contamination in Northwest Sinai, Egypt". Water Environment Research 85, n. 3 (1 marzo 2013): 211–23. http://dx.doi.org/10.2175/106143012x13560205145055.

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IWATSUKI, Teruki, Takashi MIZUNO, Takanori KUNIMARU, Yuki AMANO, Tatsuji MATSUZAKI e Takeshi SEMBA. "Expert system of hydrochemical modeling methods for geological disposal of HLW". Journal of Nuclear Fuel Cycle and Environment 19, n. 2 (2012): 51–64. http://dx.doi.org/10.3327/jnuce.19.51.

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Olariu, Andra, e Marin Palcu. "The origin of ammonium in carbonated mineral waters and its underground transport to one production well in Middle Ciuc Depression from Eastern Carpathians". SIMI 2019, SIMI 2019 (20 settembre 2019): 259–78. http://dx.doi.org/10.21698/simi.2019.fp34.

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In many cases in Romania, the mineral waters (in the Neogene Volcanic area of the Eastern Carpathians), especially the carbonate waters, have ammonium in concentration over 0.5 mg/l. The main issue regarding the presence of ammonium is identifying if the concentration is due to the anthropogenic pollution or it is of endogenic origin. The geological, hydrogeological and hydrochemical data analysis resulted in a conceptual model of the aquifer’s spatial position, groundwater movement and mineralization, and ammonium occurrence. The geological and tectonic aspects, aquifer’s recharging, groundwater flow direction, absence of surface pollution sources and correlation of hydrochemical data, all indicate the underground origin of ammonium. The aquifer is generated in pliocene - quaternary granular deposits. In the basement of these granular deposits, in the fracture areas, the groundwater is mixed with carbon dioxide and ammonium emissions, produced in the volcanic chambers. The surface data correlation and the hydrochemical data analysis resulted in the confirmation of the deep ammonium origin. After groundwater flow modeling and ammonium transport simulation, the ammonium plume size and preferential transport directions have been finally elucidated.

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Пичугина, Анна Игоревна, e Дарья Дмитриевна Гончар. "MECHANISM OF HYDROCHEMICAL OXIDATION OF HEAZLEWOODITE IN NITRIC ACID". Вестник Тверского государственного университета. Серия: Химия, n. 4(42) (21 dicembre 2020): 83–89. http://dx.doi.org/10.26456/vtchem2020.4.9.

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В работе представлена математическая модель гидрохимического окисления хизлевудита в разбавленных растворах азотной кислоты. Дана физико-химическая интерпретация основных кинетических характеристик процесса растворения: константа скорости и эффективная энергия активации. Установлены режимы взаимодействия хизлевудита с азотной кислотой, выявлены вероятные лимитирующие стадии. По наблюдаемым кинетическим закономерностям при моделировании процесса, предложен механизм гидрохимического окисления хизлевудита. The paper presents a mathematical model of the hydrochemical oxidation of heazlewoodite in dilute solutions of nitric acid. A physicochemical interpretation of the main kinetic characteristics of the dissolution process is given: the rate constant and the effective activation energy. The modes of interaction of heazlewoodite with nitric acid have been established, and probable limiting stages have been identified. According to the observed kinetic regularities in modeling the process, a mechanism for the hydrochemical oxidation of heazlewoodite has been proposed.

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Raffensperger, J. P., e G. Garven. "The formation of unconformity-type uranium ore deposits; 2, Coupled hydrochemical modeling". American Journal of Science 295, n. 6 (1 giugno 1995): 639–96. http://dx.doi.org/10.2475/ajs.295.6.639.

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Titov, Konstantin V., Alexander Levitski, Pavel K. Konosavski, Andrey V. Tarasov, Yuri T. Ilyin e Michel A. Buès. "Combined application of surface geoelectrical methods for groundwater flow modeling: A case history". GEOPHYSICS 70, n. 5 (settembre 2005): H21—H31. http://dx.doi.org/10.1190/1.2076747.

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Electrical methods [electrical profiling and sounding, induced polarization (IP), and self-potential (SP)], combined with geochemical and hydrochemical surveys, were applied to characterize shallow sediments at a site contaminated by oil-related brines. The site is located within the Romashkinskoye oil field (Tatarstan Republic, Russian Federation). Results of geochemical and hydrochemical surveys, as well as those of electrical profiling, revealed no individual haloes of contaminant in the soil and groundwater, which suggests that the entire site is contaminated. Vertical electrical IP soundings (VES-IP) allowed us to obtain the stratigraphic characteristics of the site and to distinguish a shallow aquifer among clayey aquitards. Interpretation of SP data on the basis of forward numerical modeling helped us to develop a groundwater-flow model of the site. To reduce ambiguities, we kept fixed the values of layer resistivity derived from the inverted VES-IP data. Boundary conditions on water head and water flow were based on drilling and sampling data. We varied only the values of hydraulic conductivity to fit the calculated SP values to the measured SP values. We found a strong misfit between the measured and calculated SP values for the one-aquifer model. By inferring a second, deeper-seated aquifer, we computed a two-aquifer model that produced a satisfactory SP fit.

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Più fonti

Tesi sul tema "Hydrochemical modeling"

Wolford, Ross A. "INTEGRATED HYDROCHEMICAL MODELING OF AN ALPINE WATERSHED: SIERRA NEVADA, CALIFORNIA". Department of Hydrology and Water Resources, University of Arizona (Tucson, AZ), 1992. http://hdl.handle.net/10150/617630.

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Seasonally snow covered alpine areas play a larger role in the hydrologic cycle than their area would indicate. Their ecosystems may be sensitive indicators of climatic and atmospheric change. Assessing the hydrologic and bio- geochemical responses of these areas to changes in inputs of water, chemicals and energy should be based on a detailed understanding of watershed processes. This dissertation discusses the development and testing of a model capable of predicting watershed hydrologic and hydrochemical responses to these changes. The model computes integrated water and chemical balances for watersheds with unlimited numbers of terrestrial, stream, and lake subunits, each of which may have a unique, variable snow -covered area. Model capabilities include 1) tracking of chemical inputs from precipitation, dry deposition, snowmelt, mineral weathering, basefiow or flows from areas external to the modeled watershed, and user -defined sources and sinks, 2) tracking water and chemical movements in the canopy, snowpack, soil litter, multiple soil layers, streamflow, between terrestrial subunits (surface and subsurface movement), and within lakes (2 layers), 3) chemical speciation, including free and total soluble species, precipitates, exchange complexes, and acid -neutralizing capacity, 4) nitrogen reactions, 5) a snowmelt optimization procedure capable of exactly matching observed watershed outflows, and 6) modeling riparian areas. Two years of data were available for fitting and comparing observed and modeled output. To the extent possible, model parameters are set based on physical or chemical measurements, leaving only a few fitted parameters. The effects of snowmelt rate, rate of chemical elution from the snowpack, nitrogen reactions, mineral weathering, and flow routing on modeled outputs are examined.

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Asim, Muhammad. "HYDROCHEMICAL CHARACTERIZATION AND NUMERICAL MODELING OF GROUNDWATER FLOW IN A PART OF THE HIMALAYAN FORELAND BASIN". Kent State University / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=kent1132262925.

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Timms, Wendy Amanda Civil &amp Environmental Engineering Faculty of Engineering UNSW. "The importance of aquitard windows in the development of alluvial groundwater systems : Lower Murrumbidgee, Australia". Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2001. http://handle.unsw.edu.au/1959.4/18671.

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Variable groundwater quality in complex aquifer-aquitard systems presents a challenge for sustainable groundwater development. In the Lower Murrumbidgee alluvial fan of the Murray-Darling Basin in semi arid inland Australia, shallow groundwater is saline (12000 µ S/cm) and locally contaminated by nitrate. Deep fresh aquifers (150 µ S/cm), developed as an irrigation water supply, were thought to be protected from downwards leakage by laterally extensive aquitards. However, hydrochemical sampling, augmented by historic data, revealed that aquifer salinisation (400 to 4000 µ S/cm) had occurred at some sites to 50 m depth since the mid 1980s. Aquitard windows, landscape depositional features at a scale of 10s to 100s of metres which are rarely detected by conventional investigations, were proposed as conduits for rapid downwards leakage in stressed systems. Intensive research was conducted at the Tubbo site where downhole geophysical logging and minimally disturbed cores were used to describe a saline clayey silt to 15m depth, an indurated clayey sand and 2 deep deposits of hard clayey silt. Fracturing was inferred by the scale dependency of aquitard permeability (Kv 10E-11 to 10E-6 m/s). Lithological variation near the surface was delineated by electrical imaging which revealed a 40m wide aquitard window beneath a veneer of smectite clay. Intensive monitoring of groundwater pressures in six piezometers (23-96 m depth) near the Tubbo irrigation bore and two other peizometers upgradient, indicated that the indurated clayey sand formed an effective hydraulic barrier but the deep silty deposits were spatially discontinuous. Groundwater samples were collected before, three times during, and after the 1998-99 irrigation season. A large, but delayed TDS increase occurred in the shallow aquifer and small pulses of saline water were sustained in the middle aquifer but shortlived in the deep aquifer. Hydrochemical and isotopic data dC-13, dH-2, dO-18, C-14 and H-3) showed the middle aquifer mixing with the deep aquifer, though retaining the signature of a palaeowater. Hydrochemical changes were accounted for with PHREEQC inverse mass balance models for the shallow aquifer. Mixing of aquifer water with 20-70% saline porewater from the upper aquitard occurred, together with ion exchange and NaCl dissolution. Based on an axisymmetric radial FEFLOW model, 5-30% of the volume pumped was accounted for by vertical leakage from the middle aquifer. Leakage from the shallow aquifer was small but significant, as it allowed high salinity water to migrate. Permeability and compressible storage measurements (Ss 10E-5 to 10E-4 /m) were used to constrain model calibration, and to show that direct mixing occurred mainly via aquitard windows at depth, and between the shallow and middle aquifers via leaky boreholes. Fracture flow and aquifer-aquitard interaction by diffusion were of secondary importance.

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Ibikunle, Olatunde Idris. "Modelling Chlorine Transport in Temperate Soils". Thesis, Linköping University, Department of Water and Environmental Studies, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9524.

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Microbes have been suggested to have a strong impact on the transportation of chlorine in soils. There are speculations about environmental factors limiting microbial effect on chlorine movement and retention. For this study, a numerical hydrochemical model was built to describe microbial transformation of chlorine in a laboratory lysimeter experiment. Undisturbed soil cores used to set-up the experiment were collected from a coniferous forest soil in southeast Sweden. The lysimeters were modelled in groups depending on their different water and chloride treatments. Microbial transformation of chlorine was better described under high water residence times and high chloride loads compared to low water residence times and low chloride loads. Microbial activity was also shown to properly account for a sudden shift from net-chlorine retention to net chlorine release in most of the lysimeters. Oxygen proved to be very important in accounting for the short-term shift from chloride retention to release in all the lysimeters. Model outcome revealed that 0.02– 0.10 mg Cl- could be available per day in a coniferous soil depending on season and other soil conditions. This study shows that modeling enable a better understanding of chlorine biogeochemistry. It also confirms the speculated importance of microbial activities on chloride availability in soils.

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Mohamed, Basher Hoosein. "Integrated groundwater quantity and quality management for the middle region of Libya using hydrochemical and numerical modelling approaches". Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/13739/.

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Libya is a country of desert and the arid climate makes it in extreme lack of surface water. Groundwater then becomes a very important resource to meet the economical and agricultural demand in the northern coastal areas. Groundwater has been over-exploited and some problems occurred such as saline deterioration and aquifer deterioration since 1960s. To better understand these problems for a proper management solution, this project was setup for groundwater investigations aiming better management strategy in Wadi Baye as a case study based upon the governmental water management requirement. Based on systematic literature review and data collection on geology, hydrogeology and other related environmental aspects, the groundwater systems were studied in terms of recharge and discharge, boundary and recharge and hydraulic characteristics using field based, hydrochemical/isotopic analysis and numerical modelling approaches. A series of techniques were employed to study the spatial and temporal variations of the groundwater flow field and hydrochemistry in the shallow and deep aquifer systems. The isotope signature was also used to understand the hydrochemical evolution of groundwater in Wadi Baye. It is found that the shallow groundwater is mainly influenced by the palaeo-saline hydro-environment, the deep groundwater geochemistry is impacted by mixture with the modern water around 50 km off the coastal line. A 3D groundwater numerical model was built using ModFlow based on proper calculation and calibration of the major hydraulic parameters. Calculation of groundwater budgets shows that total annual averaged recharge is 167K m3/d in Wadi Baye; the exploitable resources for shallow and deep aquifers are 33.7K and 15.6K m3/d respectively. Groundwater exploitation potential indicates that both shallow and deep groundwater systems are under over-exploitation. Sensitivity analysis of hydraulic conductivity, specific yield (storitivity) and precipitation recharge shows that hydraulic conductivity poses the greatest impact to the model in Wadi Baye. Three groundwater utilisation plans were proposed for further prediction in the future 10 years using the calibrated groundwater model. Modelling scenarios show that shallow and deep groundwater field will draw down under existing and increasing abstraction plans; drawdown in shallow groundwater will be greatly reduced if abstraction reduces to exploitable level and the overall flow field can remain stable or recover. However water level around the concentrated abstraction area will still drop down due to the localised negative balance by pumping. The best management strategy was proposed based on the modelling scenarios, to achieve a sustainable water management for the Wadi Baye area.

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Sprenger, Christoph [Verfasser]. "Surface-groundwater interactions associated with river bank filtration in Delhi (India) : investigation and modelling of hydraulic and hydrochemical processes / Christoph Sprenger". Berlin : Freie Universität Berlin, 2011. http://d-nb.info/1026069564/34.

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Naicker, Sivashni. "Conventional hydrogeological, hydrochemical and environmental isotope study of the Sandspruit River Catchment, Berg River Basin, South Africa". Thesis, 2012. http://hdl.handle.net/10413/9773.

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The Sandspruit River catchment, found within the heart of the Swartland region is infamous for wheat and wine production. Variable groundwater quality and low productivity is encountered within the folded and fractured Malmesbury Group aquifer, whilst the most productive and better quality groundwater is found within the Table Mountain Group sandstone. The Sandspruit catchment (a tributary of the Berg River) represents a drainage system, whereby saline groundwater with TDS up to 10870 mg/l, and EC up to 2140 mS/m has been documented. The catchment belongs to the winter rainfall region with precipitation seldom exceeding 400mm/yr, as such, groundwater recharge occurs predominantly from May to August. Recharge estimation using the catchment water-balance method, chloride mass balance method, and qualified guesses produced recharge rates between 8-70 mm/yr. To understand the origin, occurrence and dynamics of the saline groundwater, a coupled analysis of major ion hydrochemistry and environmental isotopes (δ¹⁸O, δ²H and ³H) data supported by conventional hydrogeological information has been undertaken. Research data were collected in three seasonal field sampling campaigns within the study catchment. These spatial and multi-temporal hydrochemical and environmental isotope data provided insight into the origin, mechanisms and spatial evolution of the groundwater salinity. These data also illustrate that the saline groundwater within the catchment can be attributed to the combined effects of evaporation, salt dissolution, and groundwater mixing. The geology together with the local and regional faults control the chemistry of the groundwater, whereby relatively fresh groundwater can be observed in certain direct recharge areas. The salinity of the groundwater tends to vary seasonally and evolves in the direction of groundwater flow. The stable isotope signatures further indicate two possible mechanisms of recharge; namely, (1) a slow diffuse type modern recharge through a relatively low permeability material as explained by heavy isotope signal and (2) a relatively quick recharge prior to evaporation from a distant high altitude source as explained by the relatively depleted isotopic signal and sub-modern to old tritium values. A conceptual hydrogeological model based on the hydrogeological, hydrochemical, and environmental isotope data was developed for the Sandspruit catchment. This model, together with statistical and groundwater quality analysis has lead to the development of a proposed local optimized monitoring scheme for the catchment.
Thesis (M.Sc.)-University of KwaZulu-Natal, Westville, 2012.

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Libri sul tema "Hydrochemical modeling"

Al-Bassam, Abdulaziz M. Hydrochemical computer modeling in groundwater related problems. Birmingham: University of Birmingham, 1987.

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Preston, Stephen D. Statistical identification of hydrochemical response units for hydrologic monitoring and modeling in Maryland. [Reston, Va.?: U.S. Dept. of the Interior, U.S. Geological Survey], 2000.

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Capitoli di libri sul tema "Hydrochemical modeling"

Sukhinov, Alexander I., Alexander E. Chistyakov, Alla V. Nikitina, Yulia V. Belova, Vladimir V. Sumbaev e Alena A. Semenyakina. "Supercomputer Modeling of Hydrochemical Condition of Shallow Waters in Summer Taking into Account the Influence of the Environment". In Communications in Computer and Information Science, 336–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99673-8_24.

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Whitehead, P. G., T. J. Musgrove e B. J. Cosby. "Hydrochemical modelling of acidification in Wales". In Acid Waters in Wales, 255–77. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1894-8_17.

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Samper, F. J., e S. P. Neuman. "Estimation of Spatial Covariance Structures with Application to Hydrological, Hydrochemical and Isotopic Data from Aquifers: State-of-the-Art and Adjoint State Maximum Likelihood Cross-Validation Methods". In Groundwater Flow and Quality Modelling, 585–620. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2889-3_32.

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"Hydrochemical models". In Developments in Environmental Modelling, 101–18. Elsevier, 1985. http://dx.doi.org/10.1016/b978-0-444-99567-4.50009-4.

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Atti di convegni sul tema "Hydrochemical modeling"

Shu-wei Qiu, Xiu-juan Liang, Chao Du, Ji-juan Yin e Chang-qing Jia. "Hydrochemical zonality and geochemical modeling of lower Liaohe plain". In 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893677.

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Rapporti di organizzazioni sul tema "Hydrochemical modeling"

Richardson, M. High-resolution landscape characterization for modelling terrestrial-aquatic hydrochemical interactions in Precambrian Shield lake districts: Recommendations for the Lac Dasserat science program. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2016. http://dx.doi.org/10.4095/297769.

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Statistical identification of hydrochemical response units for hydrologic monitoring and modeling in Maryland. US Geological Survey, 2000. http://dx.doi.org/10.3133/wri004232.

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