Evaluasi Desain dan Perencanaan Pola Operasi dan Pemeliharaan Bendung Karet Sungai Juana, Kab. Pati, Jawa Tengah

Insani, Harum Nashikhatul (2024) Evaluasi Desain dan Perencanaan Pola Operasi dan Pemeliharaan Bendung Karet Sungai Juana, Kab. Pati, Jawa Tengah. Other thesis, Intitut Teknologi Sepuluh Nopember.

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Abstract

Sungai Juana merupakan salah satu sungai dari Sub DAS Jratunseluna yaitu DAS Juana. Sungai Juana mempunyai peranan penting sebagai drainase utama anak-anak sungai dari hulu (Boyolali, Semarang, Grobogan, Demak, dan Kudus) namun manajemen pengelolaan air yang belum optimal mengakibatkan area sekitar sungai mengalami banjir saat musim hujan dan kekeringan saat musim kemarau. Selain itu backwater air laut menyebabkan petani tidak dapat bercocok tanam karena sungai yang menjadi sumber air pengairan irigasi menjadi air payau. Pola pengoperasian sebagai peran penting dalam mencapai tujuan dibangunnya Bendung Karet Sungai Juana untuk mengatasi permasalahan yang ada di DAS Juana.
Perencanaan pola operasi Bendung Karet Sungai Juana dengan mempertimbangkan stabilitas dari konstruksi bangunan yang berpedoman pada Kriteria Perencanaan Irigasi - 02, debit banjir yang dianalisis dengan metode HSS Nakayasu dan dimodelkan dengan HEC-RAS, angkutan sedimentasi dengan analisis bed load, backwater ke hulu dengan Direct Step dan Standard Step, dan pasang surut air laut yang dimodelkan dengan software bantu MIKE 21.
Konstruksi Bendung Karet Sungai Juana dianalisis dengan 3 debit banjir kala ulang, yaitu 25th (Q25) sebesar 147.54 m3/s, 50th (Q50) sebesar 160.00 m3/s, dan 100th (Q100) sebesar 168.91 m3/s. Dari hasil analisis dapat disimpulkan bahwa Bendung Karet Sungai Juana aman terhadap rembesan dan guling. Namun, tidak aman terhadap gelincir sehingga perlu dilakukan evaluasi lebih lanjut terkait stabilitas konstruksi. Panjang backwater dengan Q25th ke arah hulu sepanjang 7,1 km pada Metode Direct Step dan 1,4km pada Metode Standard Step. Sediment Transport pada Sungai Juana sebanyak 542,633.507 ton/tahun. Hasil pemodelan backwater dari muara ke bendung karet didapatkan pasang tertinggi di elevasi + 0.42 m dan surut di elevasi – 0.60 m.
Pola operasi direncanakan dengan 3 skema yaitu siap, siaga, dan awas dimana masing-masing skema berdasarkan debit kala ulang dan mempertimbangkan pasang surut air laut serta backwater yang diakibatkan dari pola operasi bendung untuk melihat keamanan kapasitas dari tanggul sungai di hulu dan di hilir. Setelah dilakukan simulasi disimpulkan bahwa Bendung Karet Sungai Juana dan tanggul Sungai Juana mampu menampung kapasitas air hingga kondisi ekstrem yaitu Q100 di hulu dan pasang tertinggi di hilir
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The Juana River is one of the rivers of the Jratunseluna Sub Watershed, namely the Juana Watershed. The Juana River has an important role as the main drainage of its tributaries from the upstream (Boyolali, Semarang, Grobogan, Demak, and Kudus) but the water management is not optimal, resulting in flooding in the area around the river during the rainy season and drought during the dry season. In addition, the backwater of seawater causes farmers to be unable to grow crops because the river which is the source of irrigation water becomes brackish water. The operating pattern plays an important role in achieving the goal of building the Juana River Rubber Dam to overcome the problems that exist in the Juana watershed.
Planning of the operation pattern of the Juana River Rubber Dam by considering the stability of the building construction guided by the Irrigation Planning Criteria - 02, flood discharge analyzed by the Nakayasu HSS method and modeled by HEC-RAS, sedimentation transportation by bed load analysis, backwater upstream with Direct Step and Standard Step, and tides of seawater modeled with software help MIKE 21.
The construction of the Juana River Rubber Dam was analyzed with 3 flood discharges, namely the 25th (Q25) of 147.54 m3/s, the 50th (Q50) of 160.00 m3/s, and the 100th (Q100) of 168.91 m3/s. From the results of the analysis, it can be concluded that the Juana River Rubber Dam is safe against seepage and rollover. However, it is not safe against slipping, so further evaluation is needed regarding construction stability. The length of the backwater with Q25th upstream is 7.1 km in the Direct Step Method and 1.4 km in the Standard Step Method. Sediment Transport on the Juana River is 542,633,507 tons/year. The results of the backwater modeling from the estuary to the rubber dam were obtained with the highest tide at elevation + 0.42 m and low tide at elevation – 0.60 m.
The operation pattern is planned with 3 schemes, namely ready, alert, and alert, where each scheme is based on re-timing discharge and considering the tides and backwaters resulting from the dam operation pattern to see the capacity safety of the river embankments upstream and downstream. After simulations, it was concluded that the Juana River Rubber Dam and the Juana River embankment can accommodate water capacity up to extreme conditions, namely Q100 upstream and the highest tide downstream.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Air Laut, Backwater, HEC-RAS, MIKE 21, Pola Operasi,Seawater, Backwater, HEC-RAS, MIKE 21, Operation
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TC Hydraulic engineering. Ocean engineering > TC175.2 Sediment transport T Technology > TC Hydraulic engineering. Ocean engineering > TC424 Water levels
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Harum Nashikhatul Insani
Date Deposited:	06 Aug 2024 01:18
Last Modified:	06 Aug 2024 01:18
URI:	http://repository.its.ac.id/id/eprint/112157

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