Surface and Subsurface Runoff Generation Processes in a Poorly Gauged Tropical Coastal Catchment, Calderon Palma, Heyddy
Автор: Keita, Amadou Название: Subsurface Drainage of Valley Bottom Irrigated Rice Schemes in Tropical Savannah ISBN: 1138381640 ISBN-13(EAN): 9781138381643 Издательство: Taylor&Francis Рейтинг: Цена: 117390.00 T Наличие на складе: Невозможна поставка. Описание: The impact of subsurface drainage on ferrous iron concentrations in the African Tropical Savannah rice irrigated valley bottom soils was investigated. The investigations and the analyses where implemented both in two typical valleys (Tiefora and Moussodougou) and in designed experiments. The results showed that subsurface drainage increases ferrous iron concentration in the hematite dominant soils - from 935 mg/l to more than 1106 mg/l in the case of the soil of Moussodougou – but also reduces soil acidity – from pH 5.6 to 7.3 in Moussodougou. This effect will eventually reduce ferrous iron intake by rice roots, alleviating toxicity.
Автор: Dorota ?wi?tek; Tomasz Okruszko Название: Modelling of Hydrological Processes in the Narew Catchment ISBN: 3642269583 ISBN-13(EAN): 9783642269585 Издательство: Springer Рейтинг: Цена: 93160.00 T Наличие на складе: Есть у поставщика Поставка под заказ. Описание: This book focuses on the modelling of flow paths that affect the fluxes of dissolved compounds from a small agricultural catchment (the Narew Catchment) during snowmelt, as this is the dominant hydrological event in many moderate and high latitude catchments.
Автор: Arie S. Issar; S.D. Resnick Название: Runoff, Infiltration and Subsurface Flow of Water in Arid and Semi-Arid Regions ISBN: 9048147018 ISBN-13(EAN): 9789048147014 Издательство: Springer Рейтинг: Цена: 121110.00 T Наличие на складе: Есть у поставщика Поставка под заказ. Описание: Arid and semi-arid regions can be defined as environments in which water is the limit- ing factor for bio-systems. Meeting the first demand, namely, supplying water to the agricultural communities and urban centers, involves, in many instances, the over-exploitation and misuse of nat- ural water resources.
Автор: Arie S. Issar; S.D. Resnick Название: Runoff, Infiltration and Subsurface Flow of Water in Arid and Semi-Arid Regions ISBN: 0792340345 ISBN-13(EAN): 9780792340348 Издательство: Springer Рейтинг: Цена: 121110.00 T Наличие на складе: Есть у поставщика Поставка под заказ. Описание: Arid and semi-arid regions can be defined as environments in which water is the limit- ing factor for bio-systems. Meeting the first demand, namely, supplying water to the agricultural communities and urban centers, involves, in many instances, the over-exploitation and misuse of nat- ural water resources.
Автор: David W. Hyndman Название: Subsurface Hydrology - Data Integration for Properties and Processes ISBN: 0875904378 ISBN-13(EAN): 9780875904375 Издательство: Wiley Рейтинг: Цена: 124550.00 T Наличие на складе: Поставка под заказ. Описание: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 171.
Groundwater is a critical resource and the PrinciPal source of drinking water for over 1.5 billion people. In 2001, the National Research Council cited as a "grand challenge" our need to understand the processes that control water movement in the subsurface. This volume faces that challenge in terms of data integration between complex, multi-scale hydrologie processes, and their links to other physical, chemical, and biological processes at multiple scales.
Subsurface Hydrology: Data Integration for Properties and Processes presents the current state of the science in four aspects:
Approaches to hydrologie data integration
Data integration for characterization of hydrologie properties
Data integration for understanding hydrologie processes
Meta-analysis of current interpretations
Scientists and researchers in the field, the laboratory, and the classroom will find this work an important resource in advancing our understanding of subsurface water movement.
Автор: P. Schulz; Rainer Helmig Название: Multiphase Flow and Transport Processes in the Subsurface ISBN: 3642645453 ISBN-13(EAN): 9783642645457 Издательство: Springer Рейтинг: Цена: 121890.00 T Наличие на складе: Есть у поставщика Поставка под заказ. Описание: One important precondition for modeling multiphase flow and transport processes in the hydrosystem "subsurface" is the general formulation of a model.
An integrated coverage of the subjects of surface, subsurface, and contaminant hydrology. The author presents the fundamental concepts of physical and contaminant hydrology of watersheds, rivers, lakes, soils, and aquifers in an easy and accessible manner to the environmental professional.
Prepares the reader to analyze today's environmental problems.
Many practical examples and solved problems illustrate the concepts. This edition includes clear presentation of concepts, consistent notation, 124 solved examples, 187 proposed problems, 152 illustrations, 71 tables, 46 short computer programs in MAPLE, answers to problems, extensive bibliography.
State of the art research on groundwater and contaminant transport modeling is explained in a clear fashion.
Recent research developments in nonlinear hydrologic science and simulation are included in this new edition.
New solutions of nonlinear infiltration are presented with simple numerical applications.
New developments in analytical decomposition are presented as simple and practical means to complex nonlinear hydrologic problems, such as regional groundwater flow modeling in homogeneous or heterogeneous media, regular or irregularly-shaped domains, steady or transient problems, multiple pumping wells, and nonlinear flow.
For contaminant transport, new applications to the simulation of nonlinear decay, nonlinear sorption, and unsaturated-saturated zones contaminant propagation are presented along with simple programs.
The Abay / Upper Blue Nile basin contributes the largest share of discharge to the river Nile. However, the basin exhibits large spatio-temporal variability in rainfall and runoff. Moreover, human activities also impact hydrological processes through intensive agriculture, overgrazing and deforestation, which substantially affect the basin hydrology. Thus, understanding hydrological processes and hydro-climatic variables at various spatio-temporal scales is essential for sustainable management of water resources in the region.
This research investigates the hydrology of the basin in depth using a range of methods at various spatio-temporal scales. The methods include long-term trend analysis of hydroclimatic variables, hydrologic responses analysis of land cover change, stable isotope techniques and process based rainfallrunoff modelling. A combination of field investigations with new measurements of precipitation, water levels and stable isotopes as well as existing hydro-climatic data offered gaining new insights about runoff generation processes in headwater catchments. The use of rainfall-runoff modelling in two meso-scale catchments of the Abay basin depict that a single model structure in a lumped way for the entire Abay basin cannot represent all the dominant hydrological processes. The results of the different approaches demonstrated the potential of the methods to better understand the basin hydrology in a data scarce region.
Urban informal settlements or slums are growing rapidly in cities in sub-Saharan Africa. Most often, a sewer system is not present and the commonly-used low-cost onsite wastewater handling practices, typically pit latrines, are frequently unplanned, uncontrolled and inefficient. Consequently, most households dispose of their untreated or partially treated wastewater on-site, generating high loads of nutrients to groundwater and streams draining these areas. However, the fate of nutrients in urban slums is generally unknown. In excess, these nutrients can cause eutrophication in downstream water bodies. This book provides an understanding of the hydro-geochemical processes affecting the generation, fate and transport of nutrients (nitrogen and phosphorus) in a typical urban slum area in Kampala, Uganda. The approach used combined experimental and modeling techniques, using a large set of hydrochemical and geochemical data collected from shallow groundwater, drainage channels and precipitation. The results show that both nitrogen-containing acid precipitation and domestic wastewater from slum areas are important sources of nutrients in urban slum catchments. For nutrients leaching to groundwater, pit latrines retained over 80% of the nutrient mass input while the underlying alluvial sandy aquifer was also an effective sink of nutrients where nitrogen was removed by denitrification and anaerobic oxidation and phosphorus by adsorption to calcite. In surface water, nutrient attenuation processes are limited. This study argues that groundwater may not be important as regards to eutrophication implying that management interventions in slum areas should primarily focus on nutrients released into drainage channels. This research is of broad interest as urbanization is an ongoing trend and many developing countries lack proper sanitation systems.
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