Download - Ts08b krib
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KRIB
Teknik Sungai 2012-05-08
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Krib/Groin/Groyne
2012-05-08 Krib
2
Struktur sungai yang ditujukan untuk
Stabilisasi alur
Pelindung tebing
Pengarah aliran
Bentuk
Konstruksi/dinding penghalang aliran, berpangkal di
salah satu tebing/sisi dan berujung di alur sungai
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Krib/Groin/Groyne
Aliran tidak dapat
menembus/melewati
groin
biasanya berupa
pasangan batu kali
bronjong/gabion
beton
sheet pile
Aliran dapat
menembus/melewati
groin
biasanya dibuat dari
tiang pancang beton
tiang pancang baja
2012-05-08
3
Krib
Impermeable groins Permeable groins
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Krib/Groin/Groyne
2012-05-08 Krib
4
Perletakan
Berbaris searah aliran, di sepanjang tebing yang ingin
dilindungi atau di sepanjang alur yang ingin
diatur/distabilkan biasanya di sisi luar belokan
Orientasi
tegak atau serong terhadap tebing
sejajar atau serong terhadap arah aliran
Jumlah dan jarak antar krib
Di atas atau di bawah muka air
muka air rendah, muka air normal, muka air banjir
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Krib/Groin/Groyne
2012-05-08 Krib
5
Konsep
Krib menahan laju aliran, ruang di antara krib tenang
(kecepatan aliran kecil) sedimentasi
Aliran terdorong ke ujung krib erosi
Di sepanjang ujung-ujung krib terbentuk alur sungai
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Krib/Groin/Groyne
2012-05-08 Krib
6
Desain
Hati-hati dalam penentuan panjang krib
Tidak ada salahnya untuk menempatkannya secara bertahap
Diawali dengan krib pendek
Dipanjangkan secara bertahap sampai terbentuknya alinemen alur yang diinginkan
Hati-hati terhadap ancaman gerusan di ujung krib
Ujung krib menahan energi kinetik besar, rentan terhadap gerusan lokal
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Krib/Groin/Groyne
2012-05-08 Krib
7
Hati-hati terhadap ancaman gerusan di pangkal krib
Krib yang berada di paling hulu rentan terhadap gerusan lokal di tebing, khususnya apabila krib tsb masih berada di daerah gerusan tebing (letak krib kurang ke hulu)
Jarak krib yang terlalu jauh menyebabkan aliran masih dapat menggerus tebing
Hati-hati terhadap ancaman gerusan tebing di sisi sungai di seberang krib
Aliran terdorong dan berbelok ke sisi seberang sungai
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Krib bronjong
Impermeable Groins
2012-05-08
8
Krib
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2012-05-08 Krib 9
Krib bronjong yang dipasang berjajar di tebing luar kelokan sungai
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2012-05-08 Krib 10
bronjong (gabion)
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Krib bronjong di S. Progo
(di hulu Jembatan Srandakan)
Impermeable Groins
2012-05-08
11
Krib
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2012-05-08 Krib 12
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Krib tiang pancang di S. Katingan, Kalteng
Krib tiang pancang di S. Progo
Permeable Groins
2012-05-08
13
Krib
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2012-05-08 Krib 14
Pemukiman
Ja
lan
Pro
pin
si
Je
mbata
n
Pemukiman
Pemukiman
Qbanjir
Qnormal
S. Katingan, Kalteng
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2012-05-08 Krib 15
S. Katingan, Kalteng
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2012-05-08 Krib 16
S. Progo (di Sapon)
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S. Serayu di Maos, Cilacap
Permeable Groins
2012-05-08
17
Krib
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2012-05-08 Krib 18
Gerusan
S. Serayu
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2012-05-08 Krib 19
1
2
3
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2012-05-08 Krib 20
3
4 tebing semula
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2012-05-08 Krib 21
3
erosi/gerusan di tebing
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2012-05-08 Krib 22
3
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2012-05-08 Krib 23
3
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S. Progo di Sapon, Kulon Progo
Impermeable Groins
2012-05-08
24
Krib
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2012-05-08 Krib 25
(Free) Intake, 1984
Bendung Sapon, 2007
Krib Sapon, 2002
Jembatan Srandakan I, 1925
Jembatan Srandakan II, 2006 Groundsill Srandakan, 2003
S. Progo, ruas Sapon-Srandakan,
Kulon Progo
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2012-05-08 Krib 26
2002
Lokasi krib di hilir Intake Sapon
Lokasi Intake Sapon Krib #1
Krib #2
Krib #2
Krib #1
“krib” (perlindungan tebing)
“krib” (perlindungan tebing)
gerusan tebing
Krib #3
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2012-05-08 Krib 27
Krib #2
Krib #1
“krib” (perlindungan tebing)
gerusan tebing
A B
C D
Mar-2002 Mar-2005
Mar-2006 Oct-2005
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2012-05-08 Krib 28
krib #3
Mar-2002
krib #3
Mar-2005
Mar-2006 Oct-2005
A B
C D
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2012-05-08 Krib 29
krib #3
Mei-2006
E
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Tipikal Krib
2012-05-08 Krib
30
lebih besar (luas) di bawah 1×1×3 m
untuk stabilitas dan antisipasi jika tergerus.
1×1×2 m
ijuk atau geotextile
untuk mencegah piping
X
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2012-05-08 Krib 31