New PDF release: Advanced Simulation and Modeling for Urban Groundwater

By Dubravka Pokrajac

ISBN-10: 0203831470

ISBN-13: 9780203831472

ISBN-10: 0203947053

ISBN-13: 9780203947050

ISBN-10: 0415453542

ISBN-13: 9780415453547

ISBN-10: 0415453550

ISBN-13: 9780415453554

ISBN-10: 9231041738

ISBN-13: 9789231041730

''UGROW (UrbanGROundWater) represents probably the most complicated city water administration instruments produced up to now and completely integrates all city water method parts together with groundwater. it's going to increase the attention of the interplay among city water method elements, aid administration decision-making, and clear up quite a lot of city water difficulties. The version has a legitimate clinical foundation, is computationally Read more...

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Additional resources for Advanced Simulation and Modeling for Urban Groundwater Management - UGROW: UNESCO-IHP

Sample text

In some cases, contaminants are conveyed via abandoned boreholes, either intentionally or unintentionally. Some discharges may be regular and recorded; many may be irregular in time and space, and unrecorded. Often, chemical discharges in urban areas are small and transitory – spillage from a container, for example. Sometimes, sources are short-lived because they are discovered relatively quickly through the auditing of storage-container fluid balances. Other sources are longer-lived because they remain undiscovered for many years or are permitted by the regulatory authority.

In general, though, confidence is likely to be greater for predictions at larger scales. As in most other groundwater modelling contexts, stochastic modelling is often an attractive way to attempt to indicate such uncertainties. When considering the evolution of the groundwater system in a city, or comparing present-day systems in developing cities with those in more established cities, continually advancing technologies and changing social systems mean that the key to the future does not necessarily lie in the past.

This will often result in changing the redox status from aerobic to anaerobic, or vice versa, with consequent effects for chemical reactions. For example, aerobic degradation of petroleum hydrocarbons may no longer occur, or anaerobic degradation may cease for chlorinated solvents. Robins et al. (1997) report a case where falling water levels induced oxygen influx, resulting in sulfide oxidation and the production of very high sulfate, low pH waters. Mixing: Wells may penetrate one or more plumes, and abstraction will thus cause within-well mixing.

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Advanced Simulation and Modeling for Urban Groundwater Management - UGROW: UNESCO-IHP by Dubravka Pokrajac


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