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基本説明
The unique aspect of this book, written by a UNESCO/IAH group, is the in-depth discussion of six different urban environments ranging from mature industrial cities, through weathered crystalline aquifers to arid-zone cities.
Full Description
More than 50% of the world's population already live in cities, and the proportion is rising extremely rapidly towards developed country levels of more than 90%. Groundwater from wells is the major source of water supply for many of these cities, however, groundwater is polluted by the cities that overlie it and sewerage systems are often absent, or leak. Industrial landuse implies the use of large quantities of chemicals, and it is the poor disposal and accidental spillage of these chemicals which results in the contamination of virtually every industrial site in the world. Much of this pollution migrates deeper to damage groundwater. Groundwater has slow turnover time, often measured in decades and centuries, reducing the self-cleansing capacity. Urban aquifers are therefore vitally important but very fragile, easily damaged and slow to repair. Urban groundwater problems and solutions vary greatly around the world. Mature cities
Contents
1. Values and Functions of Groundwater under Cities2. Characteristics of Urban Groundwater3. Sources, Types, Characteristics and Investigation of Urban Groundwater Pollutants4. Mature Industrial Cities5. Rapidly-Urbanising Arid-Zone Cities6. Urban Areas of Sub-Saharan Africa: Weathered Crystalline Aquifer Systems7. Cities Overlying Karst and Karst-like Aquifers8. Groundwater Management in Urban Alluvial Aquifer Systems: Case Studies from three continents: Agadir, Lima and Los Angeles9. Shallow Porous Aquifers in Mediterranean Climates
