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All Journal Jurnal Mahasiswa Jurusan Teknik Pengairan
Hendrawan, Andre Primantyo
Brawijaya University

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Studi Perencanaan Seawall Pada Lahan Reklamasi Bandar Udara Internasional I Gusti Ngurah Rai Bali Nugraha, Antonius Wayan Bayu; Suprijanto, Heri; Hendrawan, Andre Primantyo
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 2, No 2 (2019)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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ABSTRAK: Ditetapkannya Bali sebagai tuan rumah International Monetary Fund (IMF)-World Bank Annual Meeting 2018 berdampak pada pertumbuhan lalu lintas bandara. Mengantisipasi hal tersebut, dilakukan penambahan jumlah parkir pesawat dengan memperluas apron sisi barat, dan juga penambahan luas lahan bandara dengan reklamasi. Perlu direncanakan bangunan pengaman berupa seawall untuk melindungi daerah reklamasi saat dan setelah pekerjaan. Seawall direncanakan berupa rubble mound structure dengan armor tetrapod. Adapun dari aspek geoteknik, perlu ditinjau potensi likuifaksi dan daya dukung tanah di lokasi pekerjaan dan penanganannya guna mencegah kerusakan struktur pengaman pantai maupun fasilitas bandara. Tahapan studi dilakukan dengan menganalisis gelombang rencana kala ulang 50 tahun berdasar data angin historis dan fetch. Kemudian dapat ditentukan dimensi bangunan berdasar gelombang maksimum. Jika bangunan memenuhi stabilitas, dilanjutkan dengan analisis RAB. Perhitungan likuifaksi dilakukan berdasar data CPT (Cone Penetration Test). Seawall direncanakan 3 tipe pada kedalaman -1,25 m; -1,50 m; -1,75 m dengan panjang total 1450 m, elevasi crest +6,0 m dan analisis likuifaksi di lahan reklamasi sebanyak 2 titik dinyatakan tidak aman dan perlu penanganan soil improvement dengan metode vibroflotation.Kata kunci: reklamasi bandara, seawall, likuifaksi, rencana anggaran biayaABSTRACT: The establishment of Bali as the host of the International Monetary Fund (IMF) - World Bank Annual Meeting 2018 is having an impact on the growth of airport traffic. Anticipating this, an increase in the amount of aircraft parking was carried out by expansion of the west side apron, as well as the addition of airport land area by reclamation. A security building in the form of a seawall is intended to protect the reclamation area during and after work. The Seawall is designed as rubble mound structure with tetrapod armor. As for the geotechnical aspect, it is necessary to review the potential of liquefaction and the bearing capacity of the land at the location of work and its handling to prevent damage to the coastal safety structures and airport facilities. The stages of the study were carried out by analyzing a wave of 50-year return plans based on historical wind and fetch data. Then the building dimensions can be determined based on maximum waves. If the building meets the stability requirements, proceed with the budget plan analysis. Calculation of liquefaction is based on Cone Penetration Test data. The Seawall is planned for 3 types at a depth of -1.25 m; -1.50 m; -1.75 m with a total length of 1450 m, crest elevation +6.0 m and liquefaction analysis on the reclamation area of 2 points declared unsafe and necessary soil improvement handling with vibroflotation method.Keywords: Airport reclamation, seawall, liquefaction, budget plan
PENERAPAN METODE POTENSIAL DIRI UNTUK MENDUGA KEDALAMAN MUKA AIR TANAH DAN KESUBURAN TANAH PADA LAHAN IRIGASI AIR TANAH SDJB 490 DI KABUPATEN JOMBANG Akbar, Muhammad Sadino; Siswoyo, Hari; Hendrawan, Andre Primantyo
Jurnal Mahasiswa Jurusan Teknik Pengairan Vol 4, No 1 (2020)
Publisher : Jurusan Teknik Pengairan, Fakultas Teknik, Universitas Brawijaya

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Pada umunya para petani di Kabupaten Jombang, Kecamatan Sumobito, Desa Madiopuro belum mengetahui keberadaan muka air tanah dan tingkat kualitas kesuburan tanah pada lahan pertanian di daerah oncoran SDJB 490. Salah satu cara pendugaan keberadaan muka air tanah dengan metode Self Potential (Metode Potensial Diri), dan menggunakan alat pH meter untuk mengetahui tingkatan kesuburan tanah pada lahan pertanian daerah oncoran SDJB 490. Berdasarkan hasil penelitian yang telah dilakukan, terdapat 7 daerah yang berpotensi air tanah, pendugaan keberadaan muka air tanah lebih tepat menggunakan metode Bola, tolak ukur keberadaan muka air tanah dengan data log litologi SDJB 490, daerah berpasir dapat di aliri air, tetapi daerah yang berlempung sulit dialiri air. Pola aliran air tanah pada lokasi penelitian menyebar ke seluruh arah di lahan pertanian dari timur menuju barat, dari selatan menuju utara dan sebaliknya juga seperti itu, dan terdapat hubungan antara pola aliran air tanah dengan peta sebaran kesuburan, semakin dalam Terdapat hubungan antara pola aliran air tanah dengan peta sebaran kesuburan tanah, pola aliran air tanah mengarah dari nilai pH terendah menuju nilai pH terbesar. semakin dalam solum (lapisan) tanah, maka kemampuan tanah tersebut untuk menopang pertumbuhan tanaman semakin besar.In general, farmers in Jombang regency, Sumobito district, Madiopuro village do not know yet the existence of groundwater levels and the level of soil fertility on agricultural land at SDJB 490 irrigated field area. One of the methods to estimate the presence of groundwater level is using Self Potential Method and pH meter instrument to figure out soil fertility on agricultural land at SDJB 490 irrigated field area. According to the research result that already conducted, there are 7 areas with groundwater potential. Estimation of the presence of groundwater level is more accurate by using ball method. The parameter of the presence of groundwater level is based on lithology log data of SDJB 490. Sandy areas could be irrigated, but clays area difficult to be irrigated. The groundwater flow pattern at the research location spreads in all directions on agricultural land from east to west, from south to north and vice versa as well, and There is a relation between groundwater flow patterns and soil fertility distribution mapping, groundwater flow pattern lead from lowest pH range to highest pH range. The deeper the soil solum (layer) will lead to the greater soil capability to sustain plant growth.
Co-Authors Akbar, Muhammad Sadino Nugraha, Antonius Wayan Bayu Siswoyo, Hari Suprijanto, Heri