Model tests of hydraulic performance of Pit 6 Dam stilling basin

Authors
Citation
T. Nakato, Model tests of hydraulic performance of Pit 6 Dam stilling basin, J HYDR ENG, 126(9), 2000, pp. 638-652
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
JOURNAL OF HYDRAULIC ENGINEERING-ASCE
ISSN journal
0733-9429 → ACNP
Volume
126
Issue
9
Year of publication
2000
Pages
638 - 652
Database
ISI
SICI code
0733-9429(200009)126:9<638:MTOHPO>2.0.ZU;2-R
Abstract
Pit 6 Dam, located on the Pit River in northern California, was constructed by Pacific Gas and Electric Company in San Francisco in 1965 for hydroelec tric power generation. The gross head of the hydroelectric installation is 48.5 m for a rated generating capacity of 89 MW Flow over the ogee spillway is regulated by two radial gates, and it discharges into a 33.5-m-wide and 19.5-m-long stilling basin. Since completion of the dam, there have been c hronic problems with the floor blocks, some of which were dislodged more th an once. To elucidate the primary cause of floor block failures and develop a new type of block, a 1:28-scale undistorted hydraulic model was construc ted, and direct measurements of the longitudinal and lateral components of the forces acting on the model floor blocks were taken using a load cell. E xtremely large fluctuating loads acting on the existing blocks in the later al direction were found to be the primary cause of the block failures. Tria ngular hollow blocks, which substantially reduce the lateral loads, were th en developed using the model.