Studi kedalaman dan pola gerusan lokal yang terjadi di hilir bendung dengan kolam olakan tipe bucket dan USBR III
Abstract: Most of spillways
failure in Indonesia are caused by local
scouring that happens continuously at downstream, and at time local
scouring get the foot of spillway will
dangerous for its operational. This scour occurs because of advanced value of
specific energy overflow with high head
relatively so that it appear unbalance velocity flow and turbulence flow. An effort to protect foot spillway is build
the structure energy dissipator. From this concept at foot spillway is designed
with one, two, or more energy dissipator agree with condition and many
variables at deform process mechanism appropriately. At laboratory two dimensional physical test
had done the consideration of spillway with bucket of type stilling basin to conventional spillway and
having USBR III stilling basin at many discharges pattern and its influence for
hydraulic jump bucket flow, energy reduction, along with local scour at
downstream. This local scouring was
caused by major water flowing passing the dam where there is a high difference
level between the top and the end of the dam. Furthermore, it generates
inbalancing water flow speed and additional water turbulence. There are
different approachs to prevent such damage, and for example by providing one or
more additional construction at the end part of the dam. This structure is
designed and installed at the bottom part of the dam. Various empirical
functions have been developed to design this structure, and one of them is
developed by Lacey, Laursen, Froehlich, Mellvile and so on. However, that
function has some limitation. For examples are the local river and dam
construction characteristics. Therefore, it is required to be validated by
developing a model of dam contructed in a laboratory. Experiments was
undertaken by using the model with different characteristics of water flow in
order to investigate the scouring pattern.
Penulis: Wisafri, Indra Agus, Apwiddhal
Kode Jurnal: jptsipildd140729
