Optimization of Irrigation Operation During Emergency Post Earthquake Situation in Gumbasa Irrigation System, Sigi, East Sulawesi

Jurnal Irigasi

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Title Optimization of Irrigation Operation During Emergency Post Earthquake Situation in Gumbasa Irrigation System, Sigi, East Sulawesi
Optimasi Operasi Irigasi pada Kondisi Darurat Pasca Bencana Gempa di Daerah Irigasi Gumbasa, Sigi, Sulawesi Tengah
 
Creator Istianto, Haryo
Sofiyuddin, Hanhan Ahmad
 
Subject Optimization; Irrigation Network; Skot Beam; Sluice Gate; Water Elevation; DUFLOW
Optimasi; Jaringan Irigasi; Skot Balok; Pintu Sorong; Elevasi Muka Air; DUFLOW
 
Description Earthquake incident in Sigi District, Central Sulawesi has damaging  the  Gumbasa Irrigation Scheme. Rehabilitation of irrigation network will be carried out gradually starting at firtst stage from the intake until the canal section of BGKn 8 (Sibalaya) which affected by the liquefaction. Irrigation operations need to be carried out gradually for the section which has been rehabilitated and ready to be operated so that the local community can immediately grow crops and not lose their livelihood.  Nevertheless, the service area and required canal discharge will be much lower than the design so it will cause some water distribution problems. This research was conducted to formulate a pattern of irrigation operations in Gumbasa Irrigation Scheme in emergency situations where the canal discharge is much lower than the designed.  Research was conducted by means of data collection and formulation of irrigation operation scenarios through hydraulic analysis. Simulated scenario was an operation without optimization, optimization by using existing sluice gate, and optimization using the skot beam. The results showed that irrigation operation without optimization can not be done because the elevation of water can not rise and flows to the secondary canal due to the large primary canal dimension. The use of a sluice gate optimization can only elevate water elevation by ±1 m from the base of the canal. In addition, closing the sluice gate can result in overflow in some canal segment. In the last scenario, utilization of the skot beam for optimization is the best solution. Skot beams can elevate water at the required height. Skot Beam is a infrastructure which quite good  for a temporary irrigation operation where the water level can be adjusted  even though the discharge is relatively small.
Kejadian bencana gempa di Kabupaten Sigi, Sulawesi Tengah telah merusak Daerah Irigasi Gumbasa. Rehabilitasi jaringan irigasi akan dilaksanakan secara bertahap dimulai  pada tahap I dari bendung hingga ke ruas saluran di BGKn 8 (Sibalaya) yang terdampak likuifaksi. Operasi irigasi perlu dilakukan secara bertahap pada jaringan irigasi yang telah selesai direhabilitasi dan siap diairi sehingga masyarakat sekitar dapat segera bercocok tanam dan tidak kehilangan mata pencaharian. Namun demikian, luas layanan dan debit yang diperlukan jauh lebih rendah dibandingkan desain sehingga akan mengakibatkan beberapa kendala distribusi air. Penelitian ini untuk merumuskan pola operasi irigasi DI Gumbasa pada kondisi darurat dimana debit yang dialirkan jauh lebih kecil dibandingkan debit rencana. Penelitian dilakukan dalam bentuk pengumpulan data dan perumusan skenario operasi irigasi melalui analisis hidraulik. Skenario yang disimulasikan adalah operasi tanpa optimasi, optimasi dengan menggunakan pintu sorong eksisting, dan optimasi menggunakan skotbalok. Berdasarkan hasil permodelan, operasi irigasi tanpa optimasi tidak dapat di lakukan karena elevasi air tidak dapat naik dan mengalir ke saluran sekunder dikarenakan besarnya dimensi saluran primer. Optimasi penggunakan pintu sorong hanya dapat meninggikan elevasi air sebesar ±1 m dari dasar saluran. Selain itu jika optimasi dilakukan dengan penutupan pintu sorong secara total dapat mengakibatkan air melimpas keluar di beberapa lokasi. Pada skenario terakhir pemanfaatan skot balok untuk optimasi merupakan solusi yang terbaik. Skot balok dapat meninggikan air pada ketinggian yang dibutuhkan. Skot balok adalah bangunan yang cukup baik untuk pengatur muka air sementara dimana ketinggian muka air dapat diatur walaupun debit yang mengalir relatif kecil.
 
Publisher Balai Penelitian dan Pengembangan Irigasi
 
Contributor

 
Date 2019-12-31
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion


 
Format application/octet-stream
 
Identifier http://jurnalirigasi_pusair.pu.go.id/index.php/jurnal_irigasi/article/view/284
10.31028/ji.v14.i2.49-58
 
Source Jurnal Irigasi; Vol 14, No 2 (2019): Jurnal Irigasi; 103-112
Jurnal Irigasi; Vol 14, No 2 (2019): Jurnal Irigasi; 103-112
2615-4277
1907-5545
 
Language ind
 
Relation http://jurnalirigasi_pusair.pu.go.id/index.php/jurnal_irigasi/article/view/284/348
 
Rights Hak Cipta (c) 2019 Jurnal Irigasi
 

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