Kajian Efektivitas Normalisasi dan Tanggul Terhadap Banjir dan Rob Sungai Banger Pekalongan Berdasarkan Land Subsidence

Firano, Naufal Taqi (2026) Kajian Efektivitas Normalisasi dan Tanggul Terhadap Banjir dan Rob Sungai Banger Pekalongan Berdasarkan Land Subsidence. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kota Pekalongan merupakan wilayah pesisir dataran rendah di pantai utara Jawa yang semakin rentan terhadap banjir rob akibat dinamika pasang surut dan penurunan muka tanah (land subsidence) yang signifikan, sehingga menurunkan elevasi lahan dan kinerja infrastruktur pengendalian banjir secara berkelanjutan. Tanggul dan normalisasi Sungai Banger yang telah dibangun pemerintah belum optimal mengatasi genangan, mengindikasikan pengaruh penurunan muka tanah yang terus berlangsung. Penelitian ini bertujuan mengevaluasi efektivitas tanggul dan normalisasi Sungai Banger dengan mempertimbangkan pengaruh land subsidence serta merumuskan rekomendasi optimalisasi teknis pada segmen kritis. Laju penurunan muka tanah dianalisis menggunakan metode DInSAR dan menghasilkan proyeksi 2,61 cm/tahun sebagai koreksi elevasi model hidraulika, sementara karakteristik pasang surut dianalisis menggunakan metode Admiralty untuk menentukan elevasi muka air rencana sebagai kondisi batas hilir. Analisis hidrologi dan hidraulika dilakukan melalui pemodelan dua dimensi menggunakan HEC-RAS untuk mengevaluasi pola genangan pada beberapa skenario, termasuk pengaruh land subsidence. Hasil pemodelan menunjukkan tanggul dan normalisasi eksisting belum efektif mengendalikan genangan rob akibat penurunan kapasitas tampungan, dengan genangan residual terkonsentrasi pada segmen STA 3700–4500. Pada segmen tersebut, analisis stabilitas kondisi statis menggunakan teori kapasitas lateral tiang Broms dan tekanan tanah aktif Rankine menunjukkan struktur parapet eksisting tidak memenuhi syarat SF ≥ 1,5, sehingga dirumuskan rekomendasi desain parapet dengan pondasi minipile berdiameter 35 cm dan panjang 7 m, menghasilkan SF guling 1,59 dan SF geser 6,35. Evaluasi lebih lanjut terhadap pengaruh beban gempa menggunakan pendekatan pseudo-static (Mononobe-Okabe) berdasarkan PGA peta gempa nasional menghasilkan SF guling minimum sebesar 1,27 pada segmen sayap kiri, yang telah memenuhi syarat keamanan minimum SF ≥ 1,25 sesuai SNI 8460 2017, sehingga desain optimalisasi parapet dapat direkomendasikan sebagai solusi pengendalian banjir rob yang aman dan berkelanjutan baik pada kondisi statis maupun gempa.
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Pekalongan City is a low-lying coastal area on the north coast of Java that is increasingly vulnerable to tidal flooding due to significant tidal dynamics and land subsidence, thereby reducing land elevation and the performance of flood control infrastructure in a sustainable manner. The embankment and normalization of the Banger River that have been built by the government have not optimally overcome inundation, indicating the influence of land subsidence that continues to take place. This study aims to evaluate the effectiveness of the embankment and normalization of the Banger River by considering the influence of land subsidence and formulate technical optimization recommendations in critical segments. The rate of subsidence was analyzed using the DInSAR method and produced a projection of 2.61 cm/year as a correction for the elevation of the hydraulic model, while the tidal characteristics were analyzed using the Admiralty method to determine the planned water level elevation as the downstream boundary condition. Hydrological and hydraulic analysis was carried out through two-dimensional modeling using HEC-RAS to evaluate inundation patterns in several scenarios, including the influence of land subsidence. The modeling results showed that the existing embankments and normalization were not effective in controlling flash inundation due to a decrease in storage capacity, with residual inundation concentrated in the STA 3700–4500 segment. In this segment, the static condition stability analysis using the theory of the lateral capacity of the Broms pole and Rankine active ground pressure showed that the existing parapet structure did not meet the requirements of SF ≥ 1.5, so a parapet design recommendation was formulated with a minipile foundation with a diameter of 35 cm and a length of 7 m, resulting in a rolling SF of 1.59 and a sliding SF of 6.35. Further evaluation of the effect of earthquake load using a pseudo-static approach (Mononobe-Okabe) based on the PGA of national earthquake maps resulted in a minimum rolling SF of 1.27 in the left wing segment, which has met the minimum safety requirements of SF ≥ 1.25 according to SNI 8460 2017, so that the parapet optimization design can be recommended as a safe and sustainable tidal flood control solution in both static and earthquake conditions.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Banjir Rob, Efektivitas Tanggul dan Normalisasi Sungai, Pemodelan Hidrodinamika, Penurunan Muka Tanah, Stabilitas, Tidal Flood, Optimization Embankment Effectiveness and River Normalization, Hydrodynamic Modeling, Land Subsidence, Parapet Stability Parapet.
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering > TC530 Flood control
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Naufal Taqi Firano
Date Deposited:	01 Aug 2026 07:26
Last Modified:	01 Aug 2026 07:26
URI:	http://repository.its.ac.id/id/eprint/141926

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