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Design of the Cua Dat CFRD in Vietnam, and innovative river diversion system

Cửa Đạt là một chương trình đa năng được xây dựng tại Việt Nam. Đập chính CFRD cao nhất tại Việt Nam (H = 119 m, L = 930 m, V = 13 hm3). Lũ thiết kế (01/01 000) 13 200 m3 / s và lũ lụt Kiểm tra (1 / 10 000) 18 900 m3 / s. Các đập sẽ được xây dựng trong 5 năm (2004-2009). 20 năm lũ lụt, được thông qua như xây dựng, lũ lụt, có một dòng xả cao điểm của 1 230 m3 / s trong mùa khô và 5 050 m3 / s trong mùa mưa. Để giảm. | Michel Ho Ta Khanh Paris Giang Pham Hong Hanoi Some slides presented at ASIA 2006 Symposium Dec. 2006 Design of the Cua Dat CFRD in Vietnam a Michel Ho Ta Khanh Giang Pham Hong river Vietnam 83 000 000 people 331 000 km2 territory 75 mountains ííiữs Mean annual rainfall 2 000 mm 70 in three months of the rainy season flood drought flow redistribution Dam Development Program Cua Dat is a multipurpose scheme under construction in Vietnam. The main dam will be the highest CFRD in Vietnam H 119 m L 930 m V 13 hm3 . The Design flood 1 1 000 is 13 200 m3 s and the Check flood 1 10 000 is 18 900 m3 s. The dam will be constructed in 5 years 2004-2009 . The 20 year-flood adopted as the Construction flood has a peak inflow discharge of 1 230 m3 s during the dry season and 5 050 m3 s during the wet season. To minimize the cost of the diversion structures it was admitted to divert the flow during the most critical stage of the construction wet season of 2007 by only one tunnel L 802 m D 9 m with an overtopping of the upstream and downstream cofferdams and of the main dam about 20 m higher than the river bed. Extensive laboratory tests scale 1 40 taking into account the zoning and materials of the three structures have been performed in order to check their stability and to measure the pressure and velocity of the flows at different parts of the structures. Various alternatives have been tested protection by concrete slabs RCC gabions or downstream stepped rockfill for different dam crest and water levels depending on the construction schedule and probability of floods. These tests have permitted to verify the resistance of the dams and to define precisely the most suitable protections for their crest upstream downstream faces and toe during the overtopping with their respective advantages drawbacks and costs. This presentation provides some results of this study. Finally the tests performed indicate that this solution leads to significant cost and delay savings compared with .