TAILIEUCHUNG - Báo cáo " Luangprabang hydropower and its downstream accumulative impact on sediment flux "

With the aim to develop hydropower potential of the Lower Mekong Basin (LMB) and not to cause substantial impacts to natural environment, in 1980s and early 1990s of the last century, the then Interim Mekong Committee had studied a cascade of run-of-river hydropower projects in the Mekong mainstream. In 2008, Hydropower Development Programme of the Mekong River Committee (MRC) proposed a scenario consisting of 11 run-of-river hydropower projects. Luangprabang hydropower (LHP) is the second cascade in Laos and the tenth cascade from upstream of Lancang- Mekong river. The Environmenta1 Impact Assessment report ofLHP was carried out by Vietnam Association for. | VNU Journal of Science Earth Sciences 25 2009 84-90 Luangprabang hydropower and its downstream accumulative impact on sediment flux Nguyen Xuan Hai Nguyen Huu Huan2 Nguyen Nhan Tuan3 1 College of Science VNU 2Power Engineering Consulting Joint Stock Company I 3 Vietnam National Mekong Committee Received 26 June 2009 received in revised form 20 July 2009 Abstract. With the aim to develop hydropower potential of the Lower Mekong Basin LMB and not to cause substantial impacts to natural environment in 1980s and early 1990s of the last century the then Interim Mekong Committee had studied a cascade of run-of-river hydropower projects in the Mekong mainstream. In 2008 Hydropower Development Programme of the Mekong River Committee MRC proposed a scenario consisting of 11 run-of-river hydropower projects. Luangprabang hydropower LHP is the second cascade in Laos and the tenth cascade from upstream of Lancang- Mekong river. The Envứonmental Impact Assessment report of LHP was carried out by Vietnam Association for Conservation of Nature and Environment VACNE . The accumulative impacts of hydropower cascades in mainstream of Lancang-Mekong river to downstream are significant negative in terms of sediment flux in downstream in which contribution of the LHP is small or may be insignificant. Sediment impounded in LHP reservofr is estimated to be tons year or 17 sediment flow decreasement at Luangprabang Hydrological Station LHS . The sediment impounded in LHP reservoir decreases about total sediment volume flowing into the Mekong delta in Vietnam. Keywords Sediment index Sediment flux Accumulative impact Hydropower Mekong river. 1. Mekong river and hydropower potential Rising in the glaciers of Tibet and flowing through territories of six countries namely China Myanmar Laos Thailand Cambodia and Viet Nam before entering the South China Sea with total length of 4 400 km catchment area of 795 000 km2 average annual flows of 15 000 m3 s the Mekong River lends itself to

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