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Evaluasi Muka Air Cakung Drain Hilir terhadap Hujan Maksimum 2013 dan 2014 Harsanto, Puji; Sari, Muhammad Arif Banjaran; Lesmana, Surya Budi
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Jurnal Semesta Teknika

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Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013âs and 2014âs rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.

Analisis Drainasi di Saluran Cakung Lama Akibat Hujan Maksimum Tahun 2013 dan 2014 Harsanto, Puji; Lesmana, Surya Budi; Devianty, Sherly
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Semesta Teknika

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Flooding is an annual disaster for Indonesia. Jakarta is a city that each year nearly always experienced by flooding. The rapid development made the impervious area dropped drastically. Micro drainage is not capable of passing the volume of direct runoff. It makes many regions in Jakarta experienced by floodwaters. The aim of this research is to analyze the micro drainage capacity in Cakung Lama River. Simulations are performed with HEC-RAS 1D. The flood data is maximum rainfall on 2013 and 2014. Two scenarios normalization is done for reducing the inundated area around the river. Based on the simulation results, the existing conditions are not able to accommodate the discharge due to maximum rainfall 2013 dan 2014. Normalization of the river will give good results if the width of the river 5 m and the depth of the river is 3 m.

KAJIAN KARAKTERISTIK INFILTRASI SEDIMEN DI KAWASAN RAWAN BENCANA PADA DAS SUNGAI PUTIH PASCA ERUPSI GUNUNG MERAPI TAHUN 2010 Ikhsan, Jazaul; Harsanto, Puji; Sasongko, Danang
TAPAK [Teknologi Aplikasi Konstruksi] : Jurnal Program Studi Teknik Sipil Vol 7, No 1 (2017): November 2017
Publisher : Prodi Teknik Sipil Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/tp.v7i1.662

Erupsi Gunung Merapi yang terjadi pada tahun 2010 yang lalu adalah salah satu letusan terbesar dalam sejarah Merapi, yang menghasilkan material dengan volume material yang mencapai 150 juta m3. Salah satu material yang paling dominan adalah abu vulkanik. Material ini memiliki sifat yang cepat mengeras dan sulit ditembus oleh air, baik dari atas maupun dari bawah permukaan, sehingga menyebabkan peresapan air ke dalam tanah (infiltrasi) menjadi terganggu. Kapasitas peresapan air ke dalam tanah (kapasitas infiltrasi) menentukan besarnya limpasan permukaan (surface run off). Oleh sebab itu diperlukan adanya studi untuk mengetahui nilai kadar air, kapadatan tanah lapangan, kapasitas infiltrasi, dan volume total air infiltrasi.Tulisan ini membahas tentang studi pengujian kepadatan tanah dengan menggunakan alat kerucut pasir (sand cone) dan pengambilan sampel tanah menggunakan silinder dengan diameter 10 cm dan tinggi 30 cm. Pengukuran laju infiltrasi digunakan double ring infiltrometer dengan ukuran diameter ring 55 cm dan 30 cm, dengan tinggi 27 cm. Studi dilakukan di Kawasan Rawan Bencana (KRB) Gunung Merapi pada Daerah Aliran Sungai (DAS) Sungai Putih. Titik-titik pengujian terbagi menjadi tiga lokasi yaitu KRB I, KRB II, dan KRB III, dalam satu titik dilakukan dua kali pengujian untuk mendapatkan hasil yang lebih akurat.Hasil studi diperoleh kesimpulan bahwa nilai kadar air pada KRB I sebesar 38,27 %, pada KRB II sebesar 22 %, pada KRB III sebesar 23.66 %. Nilai kepadatan tanah lapangan pada KRB I sebesar 8,82 kN/m3, pada KRB II sebesar 13,59 kN/m3, pada KRB III sebesar 11,84 kN/m3. Nilai kapasitas infiltrasi pada KRB I sebesar 63,356 cm/jam, pada KRB II sebesar 3,057 cm/jam, pada KRB III sebesar 27,046 cm/jam. Volume total air infiltrasi area 1m2 pada KRB I sebesar 0,6427 m3, pada KRB II sebesar 0,051 m3, pada KRB III sebesar 0,311 m3.Kata kunci: Infiltrasi, Kawasan Rawan Bencana, Merapi, Sedimen

The Study of Infrastructures and Riparian Area at Krasak Watershed, Indonesia Ikhsan, Jazaul; Hilmi, Ikhlassul; Harsanto, Puji; Nursetiawan, Nursetiawan
Jurnal Teknik Sipil dan Perencanaan Vol 21, No 2 (2019): Jurnal Teknik Sipil & Perencanaan
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v21i2.20569

Debris flow that cause the eruption Merapi mount in 2010 caused damage at some infrastructure that is on the Krasak River. Some areas had gotten debris flow which was resulting break up the important access street that had been connecting between Yogyakarta and Magelang. Krasak river is one of the rivers that has upstream on the Merapi slope mount and also got impact of debris flow in 2010. This research is aimed to know condition of infrastructure and edge river at the Krasak river after got impact of debris flow. This research is using survey method that directly observes to the object of research for knowing condition infrastructure and edges river with survey form 123. The result of the research is showing some infrastructure river that is getting damage caused of cold lava. Debris flow had happened in the past, so some of infrastructure had been repairing. But there is some infrastructure still has little damage. However, the function of this infrastructure is showing good condition. Condition of edges river are still secure, it happens because the Krasak river had pass through regions plantation, but there is some locations of the settlement is in the riparian area or debris prone area.

ANALISIS LIMPASAN LANGSUNG DENGAN MODEL DISTRIBUSI DAN KOMPOSIT Harsanto, Puji; Kironoto, Bambang Agus; Triatmodjo, Bambang
Civil Engineering Forum Teknik Sipil Vol 18, No 1 (2008): JANUARI 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (210.88 KB)

Hydrological models are classified as lumped and distributed. Lumped models ignore the spatial variability of precipitation, and other related processes. Even though lumped model are unable to account for internal variation of hydrological processes, they have the advantage of simplicity. Distributed hydrological model on the other hand account for spatial variation of hydrological processes and parameters. This type of model has the potential to give more accurate results but computationally more complex. The spatially distributed input and analysis required by spatially distributed model can be met by incorporating a system that can manage data on a grid basis. An approach to handle this problem is using geographic information system (GIS). The overall objective of this study was to comparing of distributed and composite model. The SCS curve number method also known as the hydrologic soil cover complex method, is widely used procedure for runoff estimation. This method includes several important properties of the watershed namely soilâ€™s permeability, landuse and antecedent soil water conditions which are taken into consideration. Daily runoff calculations were generated using the SCS curve number method, its based on the retention parameter, S, initial abstractions, Ia (surface storage, interception, and infiltration prior to runoff), and daily rainfall, Rday. Ratio of initial abstraction (Ia) to retention parameter (S) called Î» is changes from time to time. Because of its, the hydrology analysis to estimating direct runoff need calibrate for this parameter. Goodness of fit analysis is used to comparing of both, distributed model and composite model. The average of relatif error, correlation factor, and coefficient of determination, R2 for distributed model respectively are 25.70 %, 0.71 and 0.53, from composite model are 30.15 %, 0.66 and 0.44. The result from research is obtained that the distributed model is more accurate than composite model. The average initial abstraction ratio from distrubted model is 0.35 and composite model is 0.04.

The Study of Infrastructures and Riparian Area at Krasak Watershed, Indonesia Ikhsan, Jazaul; Hilmi, Ikhlassul; Harsanto, Puji; Nursetiawan, Nursetiawan
Jurnal Teknik Sipil dan Perencanaan Vol 21, No 2 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v21i2.20569

Debris flow that cause the eruption Merapi mount in 2010 caused damage at some infrastructure that is on the Krasak River. Some areas had gotten debris flow which was resulting break up the important access street that had been connecting between Yogyakarta and Magelang. Krasak river is one of the rivers that has upstream on the Merapi slope mount and also got impact of debris flow in 2010. This research is aimed to know condition of infrastructure and edge river at the Krasak river after got impact of debris flow. This research is using survey method that directly observes to the object of research for knowing condition infrastructure and edges river with survey form 123. The result of the research is showing some infrastructure river that is getting damage caused of cold lava. Debris flow had happened in the past, so some of infrastructure had been repairing. But there is some infrastructure still has little damage. However, the function of this infrastructure is showing good condition. Condition of edges river are still secure, it happens because the Krasak river had pass through regions plantation, but there is some locations of the settlement is in the riparian area or debris prone area.

Analisis Drainasi di Saluran Cakung Lama Akibat Hujan Maksimum Tahun 2013 dan 2014 Puji Harsanto; Surya Budi Lesmana; Sherly Devianty
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.416

Flooding is an annual disaster for Indonesia. Jakarta is a city that each year nearly always experienced by flooding. The rapid development made the impervious area dropped drastically. Micro drainage is not capable of passing the volume of direct runoff. It makes many regions in Jakarta experienced by floodwaters. The aim of this research is to analyze the micro drainage capacity in Cakung Lama River. Simulations are performed with HEC-RAS 1D. The flood data is maximum rainfall on 2013 and 2014. Two scenarios normalization is done for reducing the inundated area around the river. Based on the simulation results, the existing conditions are not able to accommodate the discharge due to maximum rainfall 2013 dan 2014. Normalization of the river will give good results if the width of the river 5 m and the depth of the river is 3 m.

Evaluasi Muka Air Cakung Drain Hilir terhadap Hujan Maksimum 2013 dan 2014 Puji Harsanto; Muhammad Arif Banjaran Sari; Surya Budi Lesmana
Semesta Teknika Vol 17, No 1 (2014): MEI 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i1.406

Cakung floodway is a drainage channel that plays an importance rule for the overall of drainage system in Jakarta. Rainfall in 2013 and 2014 produced a big flood in Jakarta. Based on flood map Jakarta 2013 and 2014, there are inundated areas due to 2013’s and 2014’s rainfall. So, it is necessary to analyze the flood water level in channel floodway. Using HEC-RAS, this study aimed to evaluate the water level due to the maximum rainfall in 2013 and 2014. HEC-RAS is a tool for 1D hydraulic modeling and has reliability in routing of canal water level or river flooding. The results show that the maximum rainfall in 2013 provides a significant increasing of water level in Cakung floodway compared with the maximum rainfall in 2014. Soon, the need for canal normalization to reduce flood water level in Cakung floodway should be considered.

Aplikasi Metode Nash Pada Perhitungan Limpasan Langsung Menggunakan Data Hujan GPM 3IMERGHH Studi Kasus SubDAS Winongo Hulu Puji Harsanto; Hanan Eko Prihatmanti; Bayu Krisna Wisnulingga
Jurnal Teknik Sumber Daya Air Vol. 1 No. 2 (Desember 2021)
Publisher : Himpunan Ahli Teknik Hidraulik Indonesia (HATHI)

Data hujan terukur dari sisi jumlah dan interval waktu pendek masih belum tersedia secara merata di seluruh wilayah Indonesia. Data hujan merupakan data utama yang dapat ditransformasi menjadi data debit aliran sebagai pengganti data debit terukur untuk analisis hidrologi, sehingga keterbatasan data hujan terukur merupakan hambatan yang cukup besar. Perkembangan teknologi saat ini memberikan opsi lain sebagai pengganti data hujan terukur untuk dapat dimanfaatkan dalam analisis hidrologi. Salah satu teknologi modern yang dirasa dapat mengganti ketidak-tersediaan data hujan terukur adalah data hujan satelit. Data hujan satelit telah mencakup secara merata di seluruh wilayah Indonesia dengan interval waktu pendek. Salah satu data hujan satelit yang dapat dimanfaatkan dan ditransformasi menjadi debit aliran adalah data hujan satelit GPM 3IMERGHH. Penelitian dilakukan di sub DAS Winongo hulu pada tanggal 19 s/d 21 Februari 2017 dengan menerapkan Metode Nash pada data hujan satelit GPM 3IMERGHH yang ditinjau berdasarkan grid spasialnya untuk mengetahui perbandingan hidrograf limpasan langsung dari data hujan satelit GPM 3IMERGHH di sub DAS Winongo hulu dan data terukur dari sub DAS lain dengan karakteristik serupa. Perbandingan debit limpasan langsung sub DAS Winongo hulu dan sub DAS Code hulu menunjukkan hasil yang cukup sejajar, dengan demikian metode satuan Nash dianggap dapat digunakan untuk menganalisis hidrograf.

EVALUASI MORFOLOGI DASAR SUNGAI WINONGO DENGAN HEC-RAS 5.0.7 Irfan Maulana Ibrahim; Puji Harsanto; Bayu Krisna Wisnulingga
Jurnal Teknik Sipil Vol. 17 No. 1 (2022)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/jts.v17i1.6390

Sungai Winongo merupakan salah satu sungai yang berhulu di Gunung Merapi. Gunung Merapi merupakan salah satu gunung paling aktif di Indonesia sehingga sering kali memuntahkan material batuan dan pasir yang mengalir melalui aliran sungai. Dengan banyaknya material yang terbawa oleh aliran sungai, akan menyebabkan agradasi dan degradasi yang dapat mengubah morfologi dasar sungai. Jika terjadi secara terus menerus, hal tersebut dapat mengakibatkan kerusakan pada pengaman tebing sungai yang dapat berpotensi membahayakan wilayah sekitar. Untuk mencegah hal tersebut, dilakukan penelitian analisis angkutan sedimen dasar dengan menggunakan perangkat lunak komputer HEC-RAS 5.0.7. Dari hasil analisis yang didapat, aliran sungai yang mengalami agradasi tertinggi Q2 yaitu pada bagian hilir di cross section 1 sebesar 1,36 m, sedangkan Q50 yaitu pada bagian hulu di cross section 760 sebesar 2,093 m. Degradasi terbesar Q2 terjadi pada bagian hulu di cross section 748 sebesar 0,998 m, sedangkan Q50 yaitu pada bagian hulu di cross section 748 sebesar 0,996 m.

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