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All Journal TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL JURNAL KARYA TEKNIK SIPIL Jurnal Teknik Sipil dan Perencanaan REKAYASA Jurnal Teknik Sipil Rang Teknik Journal Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Borneo Engineering : Jurnal Teknik Sipil JURNAL TEKNIK HIDRAULIK Journal La Multiapp International Journal of Social Service and Research
Sri Sangkawati Sachro
Departemen T. Sipil FT. UNDIP Jl. Prof. H. Soedarto SH., Tembalang, Semarang 50275
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Physics Social Sciences

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Analisis Regresi Untuk Penentuan Faktor Koreksi Data Hujan Satelit (Studi Kasus Daerah Tangkapan Air Bendungan Way Apu) Nugroho, Adi Prasetya; Sachro, Sri Sangkawati
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60335

Abstract

Pengelolaan Bendungan Way Apu memerlukan ketersediaan data curah hujan yang akurat dan memiliki rentang periode yang panjang. Untuk menangani berbagai permasalahan keterbatasan data dan lokasi pos hujan observasi yang terletak di luar DTA Bendungan Way Apu dapat menggunakan data hujan satelit GPM-IMERG. Studi ini bertujuan untuk mengevaluasi dan menentukan faktor koreksi data hujan satelit GPM-IMERG dibandingkan dengan data pos hujan observasi untuk melihat kelayakannya. Koreksi data hujan satelit menggunakan metode regresi untuk kemudian dilakukan validasi dengan Uji Kesalahan Relatif (KR), Nash-Sutcliffe Efficiency (NSE), Koefisien Korelasi (R) dan Root Mean Squared Error (RMSE). Hasil studi menunjukkan perbandingan data hujan GPM-IMERG dengan data hujan observasi pada data hujan bulanan cenderung konsisten terhadap data 3 (tiga) pos curah hujan di DAS Way Apu yaitu Stasiun Meteorologi Namlea, PCH Savana Jaya dan PCH Wae Tina dengan koefisien korelasi sebesar 0,63- 0,72 (interpretasi korelasi kuat). Dari validasi 3 (tiga) rentang data hujan berbeda, skenario validasi periode 3 (tiga) tahun pada PCH Wae Tina memiliki hasil yang paling baik dalam kondisi sebelum maupun sesudah dikoreksi dengan faktor koreksi paling baik yaitu menggunakan persamaan regresi linier intercept y = 1,0620x dan koefisien determinasi (R2) sebesar 0,8660.
Analisis Peningkatan Kapasitas Hidrolik Terowongan Pengelak Menghadapi Perubahan Debit Banjir Rencana (Studi Kasus Bendungan Bener) Tryamarti, Cindy; Sachro, Sri Sangkawati
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.60324

Abstract

Pembangunan bendungan ketika konstruksi dilindungi oleh bangunan pengelak terdiri dari terowongan pengelak dan bendungan pengelak. Bangunan pengelak berfungsi mengelakkan air saat konstruksi agar area kerja terbebas dari gangguan aliran air. Terowongan pengelak di Bendungan Bener sedang tahap konstruksi sedangkan konstruksi bendungan pengelak dilaksanakan pada akhir tahun 2023. Oleh karenanya perlu dilakukan estimasi kapasitas terowongan pengelak serta penentuan elevasi bendungan pengelak dalam menampung debit banjir dengan kala ulang 25 tahun bertujuan agar tidak terjadi overtopping pada masa konstruksi. Metode untuk mendapatkan kapasitas terowongan pengelak dengan melakukan penelusuran banjir pada terowongan pengelak. Hasil analisis debit banjir rencana kala ulang 25 tahun dengan software HEC – HMS sebesar 565,90 m3/det. Penelusuran banjir di terowongan pengelak diameter 7,00 meter didapatkan elevasi bendungan pengelak +250,00 meter. Elevasi tersebut melebihi dari elevasi rencana perlu adanya skenario lain. Skenario 1 dengan penambahan 1 buah terowongan diameter 7,00 meter diperoleh tinggi bendungan pengelak pada elevasi +236,50 meter dan skenario 2 pada elevasi +235,00 penambahan 1 buah terowongan diameter 9,00 meter. Berdasarkan analisis kapasitas terowongan pengelak dapat terpenuhi pada skenario2 sehingga yang terpilih skenario 2.
The Study of The Impact of Onshore Harbor Layout on Coastal Sedimentation and Erosion at Pekalongan Beach Fattah, Zihad Al; Sangkawati, Sri; Suharyanto, Suharyanto
Jurnal Teknik Sipil dan Perencanaan Vol 25, No 2 (2023)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jtsp.v25i2.43050

Abstract

Pekalongan City is an area that frequently experiences floods. In response, the government has launched a flood management program for the Pekalongan area, which includes the relocation of the National Fishery Harbor Pekalongan. The construction of the Pekalongan Onshore Harbor will change marine hydrodynamics, current, waves and sediments. To address these issues, it is necessary to conduct a study of these changes. According to the modeling results, the maximum current speed in the harbor pool ranges from 0 to 0.28 m/s, while the maximum wave height in the harbor pool falls within the range of 0 to 0.40 meters. The bed level change at the end of modeling in the harbor pool is 0.108 mm. Notably,  the construction of the Pekalongan Onshore Harbor, as per the planned layout, induces hydrodynamic changes. An indicator of a hydrodynamics change is the alteration in currents at T4 and T5 in each model. In the proposed harbor layout, T4 and T5 exhibit a decrease in current speed, while the wave height remains relatively consistent. This change reduces erosion at T5 and even leads to sedimentation at T4 within the planned harbor layout. 
Kajian Kapasitas Pelimpah dan Terowongan Konduit Bendungan Sawangan dalam Mereduksi Debit Puncak Banjir Wibowo, Agus Aris; Sangkawati, Sri; Nugroho, Hari
Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan Vol. 18, No. 3 : Al Qalam (Mei 2024)
Publisher : Sekolah Tinggi Ilmu Al-Qur'an (STIQ) Amuntai Kalimantan Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35931/aq.v18i3.3313

Abstract

Penelitian ini bertujuan untuk menetapkan banjir desain dan kapasitas bangunan pelimpah serta untuk mengetahui efektivitas bangunan keluaran waduk (pelimpah dan Konduit) terhadap reduksi banjir secara maksimal. Lokasi wilayah penelitian adalah rencana pembangunan Bendungan Sawangan Kota Manado. Data penelitian ini berdasarkan data hidro-klimatologi, , data teknis bendungan dan waduk. Selain itu terdapat data penunjang untuk melakukan perhitungan dan analisis, seperti data debit banjir, kurva elevasi – volume waduk dan tata letak bendungan serta bangunan pelengkapnya.  Metode yang digunakan adalah melakukan perhitungan penelusuran banjir (flood routing) terhadap keluaran waduk (outlet) melalui pelimpah dan terowongan konduit (bottom outlet).Penelusuran banjir  dilakukan dengan menggunakan hidrograf inflow banjir rancangan PMF Probable Maximum Flood (PMF) sehingga reduksi banjir maksimal dapat ditentukan pada rencana pola operasinya bila konduit dilengkapi dengan pintu. Optimalisasi reduksi debit puncak banjir dilakukan dengan skenario pelimpah tanpa konduit dan skenario pelimpah dengan konduit. Paramater yang dipergunakan adalah dengan menggunakan parameter lebar pelimpah, tinggi / elevasi pelimpah dan dimensi konduit, sedangkan ukuran / kontrol scenario optimalisasi adalah tinggi sisa jagaan banjir di pelimpah, rasio kapasitas pelimpah dan reduksi debit puncak banjir inflow-outflow Bendungan Sawangan. Hasilnya kajian dan analisis  adalah perbandingan optimalisasi skenario 1 pelimpah tanpa konduit dan skenario 3 pelimpah dengan konduit diperoleh hasil reduksi debit puncak banjir PMF cukup signifikan yaitu scenario 1 reduksinya sebesar 19,0 % dan skenario 2 sebesar 36,6 %. Konfigurasi yang diperoleh adalah elevasi puncak pelimpah pada elevasi +35,0 m, lebar pelimpah 20,0 m,  dan 2 buah konduit diameter 5,0 m terbuka penuh (open fully).  Reduksi debit puncak banjir PMF dihasilkan dari inflow sebesar 1260,8 m3/det menjadi  outflow sebesar 798,98 m3/det atau sebesar 36,6 % dengan tinggi jagaan sisa 1,79 m dan rasio kapasitas pelimpah 63,4 %.
Pengaruh Perubahan Tutupan Lahan Terhadap Karakteristik Hidrograf Banjir (Studi Kasus Bendungan Jragung) Wahyuni, Indah Tri; Sachro, Sri Sangkawati
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 29, Nomor 2, DESEMBER 2023
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v29i2.59877

Abstract

Kabupaten Demak dan Grobogan merupakan wilayah yang sering mengalami banjir saat musim penghujan. Salah satu upaya untuk mengatasi banjir pada daerah tersebut, Kementerian PUPR membangun Bendungan Jragung yang direncanakan dengan menggunakan data series Tahun 1998 – 2017. Debit Sungai Jragung cenderung mengalami peningkatan dalam kurun waktu 10 tahun, yang salah satu kemungkinan penyebabnya adalah perubahan tutupan lahan. Maka, untuk mengetahui pengaruh perubahan tutupan lahan terhadap karakteristik hidrograf banjir Waduk Jragung, perlu dilakukan analisis penelusuran banjir di Waduk Jragung. Studi ini menggunakan program HEC-HMS dengan metode Soil Conservation Service (SCS – CN). Indeks perubahan tutupan lahan yang digunakan adalah curve number dan impervious. Hasil analisis menunjukkan adanya perubahan tutupan lahan pada DTA Waduk Jragung sebesar 2,5% yang didominasi oleh peningkatan luasan pemukiman sebesar 55,6%. Akibat dari perubahan tutupan lahan tersebut, debit banjir daerah tangkapan air Waduk Jragung mengalami kenaikan untuk semua kala ulang n-tahun. Besaran QPMF meningkat dari 1586,1 m3/dt menjadi 1689,6 m3/dt yang mengakibatkan peningkatan elevasi muka air banjir waduk dari +118,6 m menjadi +118,7 m.
Pengelolaan DAS Mikro: Best Practice Penanganan Potensi Konflik Akibat Semburan Gas di Lahan Pertanian Desa Nglobo, Kabupaten Blora, Jawa Tengah Sriyana, Ignatius; Sangkawati, Sri; Roselyn, Melfina; Kusmiyati, Florentina; Ramadan, Bimastyaji Surya
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 1, JULI 2024
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i1.60034

Abstract

Gas emissions occurring in the agricultural land of Nglobo Village, Blora Regency, Indonesia, have led to land contamination, resulting in worsened of watershed health over time. The evidence is apparent in the water and soil quality exceeding water quality standard. Consequently, conflicts have arisen in the community due to failed harvests of rice and corn, impacting crops failed. The aim of this research is to restore the health of the contaminated watershed, addressing both agricultural land and water quality. The methodology in this research involves a micro watershed management approach, which includes discussion activities with the community and other parties, remediation efforts, field schools and monitoring and evaluation. The study findings suggest that the addition of organic fertilizers to restore soil fertility, particularly enhancing soil organic carbon, is crucial. This is achieved by applying 29.58 tons/ha to 30.14 tons/ha of fertilizer on the affected land. Post-remediation water quality shows values below the threshold, indicating the health of the Nglobo river basin. The results of the planting test evaluation showed that rice and corn were in good condition, as evidenced by the absence of crop failure, and the fertility of agricultural land could be restored.  Micro watershed management approach, of measurable, with real action together with the affected communities and related parties, can resolve social conflicts that occur due to pollution of community agricultural land.
Analysis of The Level of Erosion Hazard in The Walanae Watershed and Land Conservation Directions to Reduce The Erosion Rate in The Walanae Watershed Firdazam, Firdazam; Sangkawati, Sri; Wulandari, Dyah Ari
International Journal of Social Service and Research Vol. 3 No. 12 (2023): International Journal of Social Service and Research (IJSSR)
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/ijssr.v3i12.650

Abstract

The Walanae Watershed (DAS) is one of the Walanae – Cenranae Sub Watersheds in several districts, including Wajo, Soppeng, Bone, and Maros regencies. The river flow in the Walanae watershed flows from south to north and empties into Lake Tempe, Wajo Regency. The condition of Lake Tempe, which continues to experience silting due to erosion and sedimentation, is still happening. This siltation resulted in sediment discharges reaching 519,000 m3/year. This siltation can cause a narrowing of the lake area and flooding around Lake Tempe. The purpose of this study is to model erosion control in the Walanae watershed to reduce the level of siltation that occurs in Lake Tempe. Analysis of the erosion rate of the Walanae watershed using the USLE method. The analysis results show that the erosion rate that occurred in 2000 was 187.52 Tons / Ha / Yr, while in 2022, it was 253.336 Tons / Ha / Yr. Scenarios based on land conservation actions can reduce the erosion rate by 149,034 tons/ha / Year. The scenario was carried out by considering slope classes and land cover in the Walanae watershed.  In flat to gentle slope conditions, ground cover crops and livestock grazing are needed; in rice fields and dryland agriculture, rural and annuals and mulch reinforcement are needed. Conservation measures are needed in steep to very steep slope classes, such as bench terraces and plant cover crops for agricultural land cover. As for forest areas, permanent vegetation or agroforestry is needed.
Risk Analysis of the Prijetan Dam in Lamongan Regency Pakpahan, Samuel Seprian; Sangkawati, Sri; Suharyanto, Suharyanto
Journal La Multiapp Vol. 5 No. 6 (2024): Journal La Multiapp
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallamultiapp.v5i6.1736

Abstract

The Prijetan Dam in Lamongan, East Java, has been in operation for over a century, making it one of the oldest dams in Indonesia. This study aims to assess the risks associated with the aging structure of the dam, including potential failures and safety concerns. The analysis was conducted using the ICOLD modified risk scoring system and the Failure Mode Effects Analysis (FMEA) method, taking into account physical deterioration, climate change impacts, and possible failure modes. The results provide insights into the current physical condition, risk levels, and necessary mitigation strategies to enhance the dam's safety and functionality. The study also prioritizes maintenance and rehabilitation actions based on risk levels, ensuring long-term operational safety and security for the surrounding areas.
Analysis of Erosion and Sedimentation Rates in Karian Reservoir using the USLE Method on the Reservoir's End-of-Life Capacity Pakpahan, Samuel Seprian; Sachro, Sri Sangkawati; Suharyanto, Suharyanto
TEKNIK Vol 46, No 2 (2025) April 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i2.67990

Abstract

Karian Reservoir is a multipurpose reservoir designed to meet raw water needs, provide irrigation water supply, reduce flooding, and generate micro-hydropower potential. It has a dead storage capacity of 46.4 million m³ with a projected service life of 100 years, based on the time required for sediment to fill the dead storage. The planned sedimentation rate of 579,162 m³/year was determined using an empirical formula derived from sediment curves based on tributary surveys conducted in 1995. If sedimentation exceeds dead storage capacity, the reservoir's lifespan and ability to meet water demands will be compromised, making it crucial to analyze sedimentation rates and distribution. Erosion rate analysis using the USLE method for the period 2017-2023 resulted in an average erosion rate of 1,249,177.27 tons/year, with a Sediment Delivery Ratio of 0.304 and a trap efficiency of 95%, leading to a sedimentation rate of 328,397.28 tons/year. The sediment deposition distribution over 100 years, estimated using the Empirical Area Reduction Method, indicated that the new base level would rise by 10.17 meters to an elevation of 30.17 meters. The remaining dead storage capacity is 21.12 million m³ (45.48%), with an effective storage capacity of 112.83 million m³ (96.38%). Theoretically, Karian Reservoir can still achieve its full service life..
Safety Evaluation of Rockfill Dam Based on Seepage Discharge Data Sulistya, Krisna; Sachro, Sri Sangkawati; Sukamta, Sukamta
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 8, No 1 (2023): EDISI MARET 2023
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33366/rekabuana.v8i1.3730

Abstract

The leading cause of failure of an embankment dam is the occurrence of excessive seepage, which triggers piping that can disrupt the stability and safety of the dam. This study discusses the dam's safety against the danger of seepage with a case study of the Jatibarang Dam. The safety evaluation uses V-notch monitoring data during the operational period from 2018 to 2021. The highest seepage discharge recorded during that period was 2,232 lt/sec/m, where the unsafe threshold for seepage based on the dam's height was 0,56 lt/sec/m, so seepage is unsafe. Meanwhile, based on the seepage discharge index (QI) calculation, the QI value is less than one, so the seepage discharge is still safe. Evaluating dam safety against excessive seepage discharge for dams of the same type as the Jatibarang Dam is more appropriate to use the seepage discharge index (QI) threshold because the parameters in the equation are complete.ABSTRAKPenyebab utama kegagalan suatu bendungan tipe urugan adalah terjadinya rembesan berlebih yang memicu piping yang dapat mengganggu kestabilan dan keamanan bendungan. Penelitian ini membahas keamanan bendungan terhadap bahaya rembesan dengan studi kasus Bendungan Jatibarang.  Evaluasi keamanan menggunakan data pemantauan V-notch selama masa operasional tahun 2018 sampai dengan 2021. Debit rembesan tertinggi yang tercatat pada kurun waktu tersebut sebesar 2,232 lt/dt/m, dimana ambang batas tidak aman terhadap rembesan berdasarkan ketinggian bendungan adalah 0,56 lt/dt/m sehingga rembesan dalam kondisi tidak aman. Sedangkan berdasarkan perhitungan indeks debit rembesan (QI) menghasilkan nilai QI kurang dari satu sehingga debit rembesan masih dalam kondisi aman. Evaluasi keamanan bendungan terhadap debit rembesan berlebih terhadap bendungan yang se-tipe Bendungan Jatibarang lebih tepat menggunakan ambang batas indeks debit rembesan (QI) karena parameter pada persamaannya lebih lengkap.
Co-Authors Afiff Faiq Hakim Harahap Andin Cipto Nugroho Andin Cipto Nugroho, Andin Cipto Arief Bayu Setiaji, Arief Atmodjo, Pranoto Samto Azkira Nur Auzan Bertha Silvia Pratiwi, Bertha Silvia Bima Anjasmoro, Bima Dwi Kurniani Dwi Kurniani Dyah Ari Wulandari Dyah Ari Wulandari Fadhlul Rahman Faisal Nurrohman Fattah, Zihad Al Firdazam, Firdazam Firman Hasiholan Fitria Sofi Choirunisa Florentina Kusmiyati Hanny Hafiar Hari Nugroho Hary Budieny Hasan Mudhofar Hasan Mudhofar, Hasan Hayu Rahayu Indah Tri Wahyuni, Indah Tri Ivanna Susanto Iwan K. Hadihardaja Joetata Hadihardaja Kirno Kirno Kresno Wikan Sadono M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Mayasari Mayasari Mohammad Faqih Murdiani, Kiki Marina Nugroho, Adi Prasetya Pakpahan, Samuel Seprian Pranoto S. Atmodjo Pranoto Samto Admodjo Pranoto Samto Atmodjo Pranoto Samto Atmojo Pranoto Samto Atmojo Ramadan, Bimastyaji Surya Recha Resnandi Raka Riris Dwi Astuti Risdiana Cholifatul Afifah, Risdiana Roselyn, Melfina Ruzika Habib Satria Waskita Eka Paksi Septina Qurniawati Siswanto Siswanto Siwu, Wulandari Pingkan Sriyana Sriyana Sriyana, Ignatius Sugiyanto Sugiyanto Suharyanto Suharyanto Suharyanto Sukamta Sukamta Sulistya, Krisna Suprapto Suprapto Sutarto Edhisono Tryamarti, Cindy Wahyu Prasetyo Waryani, Retno Sri Wibowo, Agus Aris Yohanna Fabiola Pane Yulia Ananda Putri