Impact of Land Reclamation and Urbanization on Groundwater Flow Systems PDF Download

Author: Subhas Nandy
Publisher:
ISBN: 9781374809000
Category :
Languages : en
Pages :

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Author: 陳扣平
Publisher: Open Dissertation Press
ISBN: 9781374680531
Category :
Languages : en
Pages :

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This dissertation, "Impact of Land Reclamation on Hydrogeochemical Processes in Coastal Aquifer Systems: a Case Study in Shenzhen, China" by 陳扣平, Kouping, Chen, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled IMPACT OF LAND RECLAMATION ON HYDROGEOCHEMICAL PROCESSES IN COASTAL AQUIFER SYSTEMS: A CASE STUDY IN SHENZHEN, CHINA Submitted by CHEN KOUPING for the degree of Doctor of Philosophy at The University of Hong Kong in January 2008 Land reclamation played a significant role during urban development. This study investigated the impact of land reclamation in coastal areas in Shenzhen, China on hydrochemical processes in coastal aquifer system through field sampling and testing, laboratory analysis, and hydrogeochemical modeling. Groundwater samples were collected from the original coastal aquifers and reclaimed areas and analyzed for chemical composition. Marine mud samples were collected from sites reclaimed in different periods and heavy metal concentrations were determined. Archived data of groundwater major ions collected from various sources in the study area were also analyzed. Hydrogeochemical models were set up using PHREEQC to investigate and predict the hydrogeochemical evolution of groundwater after land reclamation. The results of samples analyses illustrated that groundwater in the reclaimed area had higher metal concentrations than in the original coastal land and marine mud buried by reclamation for a longer period had lower metal concentrations. Physico-chemical changes in groundwater such as reduction in pH and salinity induced by land reclamation were believed to enhance the mobility of metals accumulated in the marine mud. The marine mud buried in the land reclamation sites acted as an internal source of heavy metals in coastal aquatic systems because heavy metals in the marine mud were released to groundwater. Both analyses of the archived data and the modelling of the hydrogeochemical system demonstrated that coastal brackish aquifers experienced freshening as a result of pumping reduction and land reclamation. The freshening time of brackish aquifer behind a reclamation site was greater than that of the brackish aquifer without reclamation because the fill materials obstructed the groundwater flow to the sea. The evolution trends of the major ions in groundwater after land reclamation were mainly determined by the cation exchange capacity of the aquifer. DOI: 10.5353/th_b3955894 Subjects: Aquifers - China - Shenzhen (Guangdong Sheng: East) Reclamation of land - Shenzhen (Guangdong Sheng: East) Groundwater - Shenzhen (Guangdong Sheng: East) Water chemistry - Shenzhen (Guangdong Sheng: East)

Author: Holger Treidel
Publisher: CRC Press
ISBN: 0415689368
Category : Nature
Languages : en
Pages : 422

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Climate change is expected to modify the hydrological cycle and affect freshwater resources. Groundwater is a critical source of fresh drinking water for almost half of the world’s population and it also supplies irrigated agriculture. Groundwater is also important in sustaining streams, lakes, wetlands, and associated ecosystems. But despite this, knowledge about the impact of climate change on groundwater quantity and quality is limited. Direct impacts of climate change on natural processes (groundwater recharge, discharge, storage, saltwater intrusion, biogeochemical reactions, chemical fate and transport) may be exacerbated by human activities (indirect impacts). Increased groundwater abstraction, for example, may be needed in areas with unsustainable or contaminated surface water resources caused by droughts and floods. Climate change effects on groundwater resources are, therefore, closely linked to other global change drivers, including population growth, urbanization and land-use change, coupled with other socio-economic and political trends. Groundwater response to global changes is a complex function that depends on climate change and variability, topography, aquifer characteristics, vegetation dynamics, and human activities. This volume contains case studies from diverse aquifer systems, scientific methods, and climatic settings that have been conducted globally under the framework of the UNESCO-IHP project Groundwater Resources Assessment under the Pressures of Humanity and Climate Change (GRAPHIC). This book presents a current and global synthesis of scientific findings and policy recommendations for scientists, water managers and policy makers towards adaptive management of groundwater sustainability under future climate change and variability.

Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 1180

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Author: Co-ordinating Council of the International Hydrological Decade. Sub-group on the Effects of Urbanization on the Hydrological Environment
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 314

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Author:
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 1180

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Author: Jacob Bear
Publisher: Springer Science & Business Media
ISBN: 9401729697
Category : Science
Languages : en
Pages : 652

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Coastal aquifers serve as major sources for freshwater supply in many countries around the world, especially in arid and semi-arid zones. Many coastal areas are also heavily urbanized, a fact that makes the need for freshwater even more acute. Coastal aquifers are highly sensitive to disturbances. Inappropriate management of a coastal aquifer may lead to its destruction as a source for freshwater much earlier than other aquifers which are not connected to the sea. The reason is the threat of seawater intrusion. In many coastal aquifers, intrusion of seawater has become one of the major constraints imposed on groundwater utilization. As sea water intrusion progresses, existing pumping wells, especially those close to the coast, become saline and have to be abandoned. Also, the area above the intruding seawater wedge is lost as a source of natural replenishment to the aquifer. Despite the importance of this subject, so far there does not exist a book that integrates our present knowledge of seawater intrusion, its occurrences, physical mechanism, chemistry, exploration by geo physical and geochemical techniques, conceptual and mathematical modeling, analytical and numerical solution methods, engineering measures of combating seawater intrusion, management strategies, and experience learned from case studies. By presenting this fairly comprehensive volume on the state-of-the-art of knowledge and ex perience on saltwater intrusion, we hoped to transfer this body of knowledge to the geologists, hydrologists, hydraulic engineers, water resources planners, managers, and governmental policy makers, who are engaged in the sustainable development of coastal fresh ground water resources.

Author: Wolfgang J. Junk
Publisher: Springer Science & Business Media
ISBN: 3662034166
Category : Science
Languages : en
Pages : 531

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Floodplains are ecosystems which are driven by periodic inundation and oscillation between terrestrial and aquatic phases. An understanding of such pulsing systems is only possible by studying both phases and linking the results into an integrated overview. This book presents the results of a 15-year study of the structure and function of one of the largest tropical floodplains, the Amazon River floodplain. It covers qualitative aspects, e.g., adaptations of aquatic and terrestrial organisms to the flood pulse as well as quantitative aspects, e.g., studies of biomass, primary production, decomposition, and nutrient cycles. The authors interpret their findings and the most important data from other studies under an integrating scientific concept, the Flood Pulse Concept.

Author: Brian J. Schneider
Publisher:
ISBN:
Category : Artificial groundwater recharge
Languages : en
Pages : 102

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Author: Marcelo Larramendy
Publisher: BoD – Books on Demand
ISBN: 9535128159
Category : Science
Languages : en
Pages : 358

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This edited book, Soil Contamination - Current Consequences and Further Solutions, is intended to provide an overview on the different environmental consequences of our anthropogenic activities, which has introduced a large number of xenobiotics that the soil cannot, or can only slower, decompose or degrade. We hope that this book will continue to meet the expectations and needs of all interested in diverse fields with expertise in soil science, health, toxicology, and other disciplines who contribute and share their findings to take this area forward for future investigations.