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Title: Reservoir delineation and cumulative impacts assessment in large river basins: A case study of the Yangtze River Basin
Keywords: Hydropower dam, Reservoir delineation, sediment retention, River fragmentation,Yangtze River
Issue Date: 21-Aug-2014
Source: YANG XIANKUN (2014-08-21). Reservoir delineation and cumulative impacts assessment in large river basins: A case study of the Yangtze River Basin. ScholarBank@NUS Repository.
Abstract: Focusing on the fast-damming Yangtze River, this thesis developed a parsimonious approach to delineate reservoirs in the entire Yangtze River basin. Using the data, this study proposed new models to assess the cumulative impacts of dams/reservoirs on water regulation, sediment retention, river connectivity and river landscape fragmentation. This study delineated nearly 43,600 reservoirs with a total water storage capacity of approximately 288 km3. The annual sediment accumulated in the 43,600 reservoirs is approximately 691 (? 94) million tons (Mt). Using three proposed metrics, the assessments revealed that that the Yangtze has experienced strong alterations over the past decades. This study also revealed that previously overlooked small dams can also exert significant impacts in flow regulation and river landscape fragmentation on regional river systems through their sheer number and density. The knowledge obtained here is essential to identify environmental risks associated with further impacts on river systems making it easier to develop the Yangtze River basin with a relatively lower environmental footprint.
Appears in Collections:Ph.D Theses (Open)

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