Sri Sangkawati Sachro
Jurusan Teknik Sipil Fakultas Teknik Universitas Diponegoro Jl. Prof. Soedarto,SH-Tembalang-Semarang.

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Korelasi Klasifikasi Penutup Lahan dengan Debit Puncak di Daerah Aliran Sungai Sachro, Sri Sangkawati; Edhisono, Sutarto; Atmodjo, Pranoto Samto; Prasetyo, Wahyu
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 23, Nomor 2, DESEMBER 2017
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (798.912 KB) | DOI: 10.14710/mkts.v23i2.16687

Abstract

Many studies have shown that land use changes in watersheds such as forests that convert to settlements, industrial and estates, have an impact on flooding. So it is important to know the correlation between the various land use changes to the discharge within a watershed. This study is a preliminary study in an attempt to assess the correlation between land cover index and peak discharge, with case studies in the Beringin River Basin.The peak discharge with the return period of 2, 5, 10, 20, 50 and 100 years are computed with HEC-HMS software, developed by Hydrologic Engineering Centre (HEC) and US Army Corps of Engineers which computes the runoff discharge from the precipitation. As for land covered index (LCI), it is defined as the sum of the land-use index (LUI). The result of the case study shows the strong correlation between the land covered index with the the runoff discharge with such relation : Q100 = -22.42LCI2 + 214.30LCI - 10.62, Q50 = -18.33LCI2 + 181.87LCI - 20.19, Q20 = -14.30LCI2 + 145.27LCI - 15.61, Q10 = -11.36LCI2 + 118.41LCI - 12.29, Q5 = -8.42LCI2 + 91.27LCI - 8.9 and Q2 = -4.44LCI2 + 53.54LCI - 4.5.
Perkiraan Koefisien-koefisien Karakteristik Daerah Aliran Sungai Krengseng untuk Membangun Kurva-Durasi Debit Sachro, Sri Sangkawati; Sugiyanto, Sugiyanto; Budieny, Hary
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 1, JULI 2013
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (554.341 KB) | DOI: 10.14710/mkts.v19i1.7831

Abstract

The flow-duration curve at a site is most useful tool for evaluating flows in water resources development projects. Flow-duration curves are based on cotinuous stream flow data, where stream flow meuserements are not available, precipitation and potensial evapotranspiration records can be used to calculate continuous flows. Calculation of monthly flows from meteorologic data are based on the water balance in watershed. The water balance equation is Precipitation – Actual evapotranspiration + Storage = Runoff. This calculation use coefficients that represent watershed characteristics, that will change from one watershed to another. The watershed characteristic coefficients changes will correlate with changes in vegetation, soils, and subsurface geology. This study is an attempt to estimate the watershed characteristic coefficients to calculate monthly streamflows in Krengseng River at Diponegoro Dam site. The  watershed characteristic coefficients analysis using F.J.Mock Model and NRECA Model. Resuls of watershed characteristic coefficients  analysis using F.J.Mock are, Expose surface, m = 50%, Soil moisture capacity, SMC = 200 mm, Infiltration factor, IF = 0.45, Recesion coeffisien, RC =0.70. Watershed characteristic coefficients using Model NRECA are, Index soil moisture capacity, Nominal:100+(0.25xmean annual precipitation), Base flow parameter, PSUB = 0.30 and Index groundwater storage, GWF=0.50.
Uji Kemampuan Bangunan Pengaman Mengurangi Longsoran pada Balas Rel akibat Banjir Atmojo, Pranoto Samto; Sachro, Sri Sangkawati; Budieny, Hary
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 1, JULI 2013
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (689.262 KB) | DOI: 10.14710/mkts.v19i1.7835

Abstract

Ballast rail has a vital fuction to support the train’s load and its dynamic forces. This load is then distributed to the subgrade layer through pile of gravel under the ballast. Most of the design about the gravel layer (ballast) doesn’t take into account the effect of flood overflow on the rail, which is very likely to occur during rainy season. The Flood flows above the rail will reduce the ballast stability and then eroded. Part or most of the gravel were flushed out, thus resulting the ballast to be weak and may collapse, which is vey dangerous to the train traffic. Its therefore requires to investigate stability of the ballast under flood flow above the rail condition and any measure or improvement required by Hydraulic Modeling. The research is conducted at Hydraulic Laboratory, Diponegoro University. The model prototype is refer a tract rail at Mangkang-Semarang KM.12, with scale of 1:5. Its shown that the ballast  without a safety structure will start to scour when water level h1 = 15 cm , meanwhile with the structures Type 1 and Type 1 + 1 its start scour h1 = 17 and 19 cm respectively. The safety structure is able to scouring decrease , ie at the variation of h1 = 19 cm , there are 68.50 cm without structure, and with structure Type 1 and Type 2 are  29 and  26 cm respectively. This research shown that it needs to installing safety structure (sill) to reduce the danger cause of flood flow over the rail, especially at the flood prone area. The Management of train traffic could adopt this result how to protect of ballast scour cause of flood.
Pembangkitan Data Debit dan Skenario Pola Tanam Daerah Irigasi Embung Suruhan Pratiwi, Bertha Silvia; Sachro, Sri Sangkawati; Suharyanto, Suharyanto
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 23, Nomor 1, JULI 2017
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (491.821 KB) | DOI: 10.14710/mkts.v23i1.13805

Abstract

The availability of historical data used in hydrological analysis is often incomplete and very short, so the information obtained from the data is also very little. If continue to use incomplete historical data or a little period of time, the analysis results will not match the circumstances in the field. Hydrology analysis in planning of Embung Suruhan uses rainfall data from Jiken Station, Blora Station and Bogorejo Station from 1986-2006 and climatology data of Tempuran Reservoir Station 1986-2005 with 4.6 million m3. The next study, capacity 6.69 million m3 with rainfall data from five stations, namely: Blora station, Jiken, Gayam, Greneng, and Tempuran from 1997-2012 and climatological data of Tempuran Reservoir and Kedung Ombo Reservoir. This research is to get the requirement of optimal irrigation with forecasting of discharge data and simulation of initial variation of planting and some scenario type of planting pattern from Embung Suruhan. Discharge was analyzed by Mock method and then raised up to 25 years with Thomas Fiering model and to get the water availability used Basic Year. The discharge data has characteristics that are close to historical data and in 2018 as the basic year used for water availability.
Studi Pendapat Publik dalam Penganggaran Operasi, Pemeliharaan dan Manajemen Sumber Daya Air Sachro, Sri Sangkawati
Jurnal Teknik Sipil Vol 21, No 2 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (376.539 KB)

Abstract

Abstrak. Hubungan antara anggaran Operasi, Pemeliharaan dan Manajemen (OP&M) dengan kemampuan system sumber daya air untuk mencapai kinerja yang tinggi sudah menjadi perhatian dalam pengelolaan sumber daya air. Pada saat ada keterbatasan dana, maka akan mengakibatkan satu atau beberapa kegiatan tidak dapat dikerjakan, dan pengelola harus memilih prioritas kegiatan OP&M. Pengelola mempunyai pertimbangan masing-masing di dalam menentukan prioritas kegiatan tersebut. Salah satu sumber dana untuk pengelolaan sumber daya air adalah biaya jasa pengelolaan sumber daya air (BJP-SDA), yaitu biaya kontribusi dari para penerima manfaat, sehingga diperlukan identifikasi penerima manfaat dan faktor-faktor pengaruh kecukupan dana OP&M. Identifikasi dilakukan melalui pendapat publik yaitu penilaian obyektif dari pakar pengelolaan sumber daya air melalui kuesener.Kuesioner ini menyoroti dan menyelidikai rincian biaya OP&M, prioritas kegiatan dan biaya jasa pengelolaan sumber daya air. Berdasarkan identifikasi terhadap penerima manfaat yang diharapkan ikut menanggung biaya pengelolaan sumber daya air dapat disimpulkan bahwa: pihak-pihak yang berkepentingan dalam pengelolaan sumber daya air sudah memahami bahwa biaya menjadi tanggung jawab bersama.Abstract. The relation between Operation, Maintanance and Management OM&M funding and the ability of water resources system to achieve high performance became attention in water-resources management. When there is fund limitation, one or some activities can not be conducted, and organizer must selects activity priority of OM&M. Every organizer have consideration by it self in determining activity priority. One of the fund sources for the water resources management is the service cost of water resources management, that is contribution expense from beneficiaries, then identification of beneficiaries and influence factors to fund sufficiency OM&M are needed. Identification through public opinion, that is objective assessment of water resource management expert by giving questionnaires. This questionnaires was to highlight and investigate the breakdown of OM&M expenditure, expenditure priorities, service charge. Base on the identification toward beneficaries who are expected to cover the water resources management cost, it can be summarized that other parties who have an interest in water resources management have already understood that the cost is a collective responsibility.
Penggunaan Analisis Dimensi untuk Mencari Korelasi Antar Variabel pada Uji Model Hidrolik Atmojo, Pranoto Samto; Sachro, Sri Sangkawati; Budieny, Hary
Jurnal Teknik Sipil Vol 21, No 3 (2014)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (586.522 KB)

Abstract

Abstrak. Dalam penelitian pemodelan, perumusan korelasi antara satu variabel dengan kelompok variabel lain dapat diselesaikan dengan analisis dimensi atau statistik. Analisis dimensi dalam hal tertentu akan lebih mudah dan relatif cepat untuk mengetahui hasilnya. Ada beberapa metode analisis dimensi yang sering digunakan, antara lain Metode Buckingham, Indicial, dan matrix. Tulisan berikut akan menggunakan analisis dimensi metoda Buckingham’s untuk menentukan korelasi konsentrasi sedimen yang tergerus (C) dan kelompok variabel lain (Hw, g, ρw, Qw, Hs, ds, ρs , v) pada model penggelontoran sedimen. Berikutnya akan dapat diketahui korelasi konsentrasi sedimen maksimum hasil penggelontoran terhadap tinggi muka air hulu pada setiap tebal sedimen (d) yang telah mengendap.Pemodelan dengan skala 1:66,67, menggunakan sedimen tiruan serbuk batubara. Tebal sedimen yang mengendap diasumsikan 1,5; 2,25; 3,00; 3,75; 4,50 cm. Pengukuran konsentrasi yang tergelontor pada saat setiap muka air turun 1,50 cm dari tinggi muka air awal 13,90 cm. Hasil analisis didapat korelasi: C / ρ s = ƒ( Qw.v / H3 w . ɡ), dan konsentrasi sedimen maksimum hasil penggelontoran setiap tebal endapan didapat pada ketinggian muka air : Hw = 10,58 Hs-0,12HwAbstract. In the modeling research, the correlation formulation between one variable to a group of other variables can be solved by dimensional analysis or statistics. Dimensional analysis would be easy and relatively quick to obtain results in the certain cases. There are several methods of analysis dimensions that are often used, among other methods are Buckingham’s, Indicial, and matrix. The following article will use the dimensional analysis Buckingham’s method to determine the correlation of flushed sediment concentration (C) and a group of other variables (HW , g , ρw , QW , Hs , ds , ρs , v) in the flushed sediment modeling. The next step its will be known correlation maximum concentration of sediment flushed results against upstream water level at each sediment thickness (d) which has been deposited. Modeling scale of 1 : 66.67, use sediment artificial with coal dust. The thickness of sediment that settles at the assumed 1.5 ; 2.25 ; 3.00 ; 3.75 ; 4.50 cm. The flushed sediment concentration measurements were conducted during the upstream water level every drop of 1.50 cm, from the initial water level 13.90 cm. The results of the analysis correlation can be obtained : C / ρ s = ƒ( Qw.v / H3 w . ɡ), and the maximum concentration of flushed every sediment thickness can be obtained at water level : Hw = 10,58 Hs-0,12Hw
Estimasi dan Evaluasi Debit Rembesan pada Bendungan Urugan Batu Zonal Inti Tegak Siswanto, Siswanto; Suprapto, Suprapto; Sachro, Sri Sangkawati
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia Vol 4, No 2 (2019): EDISI SEPTEMBER 2019
Publisher : Universitas Tribhuwana Tunggadewi Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1006.422 KB) | DOI: 10.33366/rekabuana.v4i2.1424

Abstract

Bendungan urugan batu zonal inti tegak mempunyai geometri yang lebih kompleks dibandingkan dengan bendungan tanah homogen. Banyaknya bentuk geometri dan material yang digunakan menyebabkan prediksi dan perhitungan yang lebih rumit. Pemodelan finite element (FEM) sering digunakan untuk menghitung perilaku rembesan yang terjadi. Tujuan dari penelitian ini adalah untuk mendapatkan model numeris yang dapat digunakan sebagai estimasi debit rembesan sekaligus sebagai validasi pemodelan rembesan pada bendungan urugan batu inti tegak. Evaluasi debit berdasarkan pengukuran instrumen diperlukan untuk validasi pemodelan numeris yang dilakukan. Hukum Darcy dan Casagrande dapat digunakan untuk mengevaluasi pola debit terukur. Debit rembesan berbanding lurus dengan ketinggian muka air waduk dan berbanding terbalik dengan panjang lintasan rembesan. Metode statistik dan regresi digunakan untuk mendapatkan pola rembesan berdasarkan akuisisi data rembesan melalui V-Notch. Estimasi dan pola rembesan ini penting untuk diketahui, sehubungan dengan kinerja electronic instrument yang berpotensi mengalami kerusakan dan sulitnya akses pada gallery karena suatu keadaan. Studi kasus pada paper ini dilakukan pada Bendungan Jatibarang (Semarang), dimana bendungan ini mulai beroperasi penuh pada tahun 2015. Inkonsistensi data debit rembesan terjadi sampai dengan 3 tahun setelah penggenangan bendungan dilakukan. Pola linier hubungan debit rembesan (q) berdasarkan ketinggian muka air waduk (h) yaitu q = 0.5221h - 68.958. Koefisien determinasi pada model tersebut sebesar 78.5%, nilai ini mengindikasikan bahwa model tersebut sudah cukup baik untuk digunakan. Pendekatan ini dapat digunakan sebagai validasi data pada semua jenis pemodelan sesuai dengan tujuan pemodelan tersebut akan dilakukan. Kata Kunci : rembesan; bendungan urugan batu; v-notch ABSTRACTVertical zoned rockfill dam has a more complex geometry compared to a homogeneous earthfill dam. The many geometric shapes and materials used to cause more complex predictions and calculations. Finite element (FEM) modeling is often used to calculate seepage behavior. The purpose of this study is to obtain a numerical model that can be used to estimate of seepage discharge and as validation of seepage modeling on zoned vertical rockfill dam. Seepage evaluation based on instrument measurements is needed for validation of numerical modeling performed. Darcy's and Casagrande's Law can be used to evaluate the measured discharge pattern. The seepage discharge is directly proportional to the height of the reservoir water level and inversely proportional to the length of the seepage path. Statistical and regression methods are used to obtain the seepage pattern based on seepage data acquisition using V-Notch. Estimation and seepage pattern is important to know due to the performance of electronic instruments that have apotential damage and difficult access to the gallery. The case study in this paper was carried out at the Jatibarang Dam (Semarang), where the dam began full operation in 2015. The inconsistency of seepage discharge data occurred up to 3 years after the impounding of the dam. The linear pattern of seepage discharge relationship (q) based on reservoir water level (h) is q = 0.5221h - 68.958. The coefficient of determination in the model is 78.5%, this value indicates that the model is good enough to be used. This approach can be used for data validation on all types of modeling in accordance with the purpose of the modeling will be carried out.