Pengendalian Banjir Dan Pemanfaatan Air Pada "Sistem Pengelolaan Air Jabung Ring Dyke" Kabupaten Tuban

Mahanani, Risa Virgiyanti (2026) Pengendalian Banjir Dan Pemanfaatan Air Pada "Sistem Pengelolaan Air Jabung Ring Dyke" Kabupaten Tuban. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Sistem Pengelolaan Air Jabung Ring Dyke di Kabupaten Tuban berfungsi sebagai pengontrol banjir hilir Sungai Bengawan Solo sekaligus penyedia air irigasi bagi Daerah Irigasi (DI) Jabung. Namun, keterbatasan kapasitas penampang dan pola operasi bangunan air yang belum optimal menyebabkan luapan banjir berulang di Avur Kuwu seluas sekitar 1.700 ha serta defisit irigasi air. ini mengintegrasikan analisis hidrologi distribusi Log Pearson Type III dan Hidrograf Satuan Sintetik (HSS) Nakayasu untuk menetapkan banjir rencana. Hasilnya, debit banjir rencana Avur Kuwu Q₂₅ sebesar 399,41 m³/detik dan Plangwot Q₁₀₀ sebesar 917,20 m³/detik. Selain itu, analisis ketersediaan air metode Penman Modifikasi dan FJ Mock juga dilakukan untuk menentukan ketersediaan air. Pemodelan pola operasi irigasi dengan Vensim PLE serta pemodelan hidraulika aliran tak tunak (unsteady flow) 2D menggunakan HEC-RAS dengan kondisi batas pasang surut Admiralty juga menjadi bagian dari analisis proyek akhir. Hasil simulasi menunjukkan bahwa pola operasi yang ada yang menutup seluruh pintu air dan mengembangkan penuh Bendung Karet Sedayu Lawas memicu konservasi seluas 819,41 ha. Namun, penerapan skenario operasional Buka Pintu Air berhasil mereduksi banjir sebesar 89,55% hingga tersisa 85,59 ha. Sisanya di bagian hulu tersebut dibebaskan sepenuhnya melalui perencanaan peninggian tanggul Avur Kuwu setinggi 1 meter pada segmen P.1–P.16. Hal ini meningkatkan kapasitas saluran menjadi 401,46 - 428,99 m³/detik secara aman. Sementara itu, untuk memenuhi total kebutuhan air irigasi sebesar 5,90 m³/detik, pemodelan Vensim PLE membuka pintu Inlet Jabung secara dinamis sebesar 0,00 - 0,10 meter pada kondisi tampungan efektif dan 0,20 - 0,25 meter pada kondisi tampungan minimum. Hal ini guna mengompensasi defisit debit Avur Kuwu. Kombinasi pola operasi pintu air, bedung karet, dan peninggian tanggul Avur Kuwu secara efektif mampu membebaskan wilayah studi dari banjir sekaligus menjamin keinginan pasokan air yang disalurkan DI Jabung.
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The Jabung Ring Dyke Water Management System in Tuban Regency serves to control downstream flooding of the Bengawan Solo River while also supplying irrigation water to the Jabung Irrigation Area (DI). However, limited cross-sectional capacity and suboptimal water structure operation patterns have caused recurring flood overflows in the Kuwu Drainage Channel (Avur Kuwu)—affecting approximately 1,700 hectares—as well as irrigation water deficits. This study integrates hydrological analysis using the Log Pearson Type III distribution and the Nakayasu Synthetic Unit Hydrograph (SUH) to establish design flood parameters. The results indicate a design flood discharge (Q) of 399.41 m³/s for Avur Kuwu (Q25) and 917.20 m³/s for Plangwot (Q100). Additionally, water availability was assessed using the Modified Penman and FJ Mock methods. The analysis also included irrigation operation pattern modeling via Vensim PLE and 2D unsteady flow hydraulic modeling using HEC-RAS, incorporating Admiralty tidal boundary conditions. Simulation results show that the existing operation pattern—which closes all sluice gates and fully inflates the Sedayu Lawas Rubber Weir—results in an inundated area of 819.41 hectares. However, implementing an "Open Sluice Gate" operational scenario successfully reduced flooding by 89.55%, leaving 85.59 hectares inundated. This remaining upstream inundation was fully eliminated by planning a 1-meter embankment raise along the P.1–P.16 segment of the Kuwu Drainage Channel, safely increasing the channel's capacity to a range of 401.46–428.99 m³/s. Meanwhile, to meet the total irrigation water demand of 5.90 m³/s, the Vensim PLE model dictates dynamic opening of the Jabung Inlet gate: 0.00–0.10 meters under effective storage conditions and 0.20–0.25 meters under minimum storage conditions. This measure aims to compensate for the discharge deficit of the Avur Kuwu channel. The combined operational strategy involving sluice gates, a rubber weir, and the raising of the Avur Kuwu embankments effectively protects the study area from flooding while ensuring the required water supply for the Jabung Irrigation Area.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pengendalian Banjir, Bendung Karet, Pintu Air, Pola Operasi, Ketersediaan Air,HEC-RAS,Vensim PLE Flood Control, Rubber Dam, Sluice Gate, Operational Pattern, Water Availability, HEC-RAS, Vensim PLE
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs T Technology > TC Hydraulic engineering. Ocean engineering > TC424 Water levels T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Risa Virgiyanti Mahanani
Date Deposited:	04 Aug 2026 01:50
Last Modified:	04 Aug 2026 01:50
URI:	http://repository.its.ac.id/id/eprint/142715

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