Author(s): Minoru Mlneta; Makoto Yamazaki; Ken-Ichi Hirayama
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Abstract: A large quantity of frazil slush generates in cold region rivers during the winter period. Adhesion of frazil slush to the intake structures of hydroelectric power plants. which often results in clogging the openings of those structures, interrupts intake of power generating water from those rivers. To secure continuous water- intake in the season. we developed a new type of ice control structure. a fence boom. This self-standing fence boom is made of wooden bars with steel supports. Together with observation of hydraulic and meteorological conditions including river water temperature. field tests were conducted in the Penkeniuppu River for two years. on which the Niuppugawa Power Station is located. to prove the effectiveness of the fence boom. During the tests. frazil slush clogged the fence boom and changed it to an ice dam, which rose water level on the upstream side of the fence boom and formed a pond with an ice cover. Frazil slush was observed accumulating under the ice cover. The power station did not need to carry out deicing work of its intake structures during the tests, which are normally required several times a year. This report discusses the relation between growth of an ice dam and river water temperature. formation process of an ice cover and change in stream regime.
Year: 1994