DAMS FOR SUSTAINABLE DEVELOPMENT

摘要：

1 Introduction The renewable water resources in the world，which come from solar heat machine that is the hydrological cycle，could be estimated at approximately 40，000 Km3 per year.However,of these only around 9,000 Km3 are accessible，owing to geographical restrictions and the temporal variations of the river flows.For example，about 30％ of these resources are found in South America，where the Amazon accounts for 6，300 Km3 per year,16％ of world resources.In Asia，about 80％ of the runoff is concentrated in the four months of the monsoon season.This irregularity in time，and the uneven geographic location and concentration，give rise to the fact that the natural accessible resources are only some 9,000 Km3/year,22.5％ of the renewable resources.This explains why it has been necessary to construct more than 50，000 large dams over the past 5,000 years，in order to be able to satisfy the demand for water,which is essential for the life and human development.These large dams and their reservoirs regulate about 3,500 Km3 per year.In total the available water resources in the world are evaluated at some 12，500 Km3/year,31％ of renewable water resources.Therefore，the reservoirs contribute significantly to the world’s available water resources，with around 30％ of the available resources.

作者: L.Berga

作者单位: International Commission on Large Dams.ICOLD

会议类型: 国际会议

会议名称: High-level International Forum on Water Resources and Hydropower(第一届国际水利水电高层论坛)

会议地点: 北京

会议语种:英文

页码: 1-6

在线出版日期: 2008-10-17（万方平台首次上网日期，不代表论文的发表时间）