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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 Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Neuroscience Physics Social Sciences Transportation

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 1 
PERBANDINGAN EFEKTIFITAS HASIL PENGGELONTORAN SEDIMEN DI WADUK CARA FLUSHING DAN SLUICING Atmodjo, Pranoto S.; Sangkawati, Sri; Kirno, Kirno
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.83 KB) | DOI: 10.14710/teknik.v34i2.5627

Abstract

This study compares the effectiveness of the flushing of sediment in the reservoir by means of flushing andSluicing way, based on Physical Hydraulic Test (Model Test) in the laboratory. Flushing is removingaccumulated deposited sediment. While slucing is releasing of sediment through the reservoir beforesettled or keep sediment remain in suspension and its occur during flood period. Sediments FlushEffectiveness represented by the percentage of released sediment by sediment deposited or the amount ofsediment entering the reservoir during the flushing period.The model based on the prototipe from DetailDesign of Structural Countermeasures for Sedimentation on Wonogiri Reservoir by Nippon Koei 2009.Running model duration is one hour, used free flow and submergence condition, with discharge variationQ=100, 200 and 400 m3/s. Sluicing experiments conducted with some 60 liters of sediment sprinkle evenlywide flow, and Flushing implemented by 2,00 m thickness of deposited sediment that spreaded over thereservoir bottom before running. From this research showed that Sluicing way more efficient than theflushing way, where the number of efficiency of sediment Sluicing way bigger than the efficiency offlusing way, in the running an hour in the laboratory test
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.
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..
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 Khaidir, Trifad Mochammad 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 Rohman, Fauji Roselyn, Melfina Ruzika Habib Satria Waskita Eka Paksi Septina Qurniawati Siswanto Siswanto Siwu, Wulandari Pingkan Sriyana Sriyana 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