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All Journal Jurnal Mahasiswa Jurusan Teknik Sipil Jurnal Teknik Pengairan: Journal of Water Resources Engineering Civil and Environmental Science Journal (CIVENSE)
Cahya, Evi Nur
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

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Analisa Limpasan Berdasarkan Curah Hujan Menggunakan Model Artifical Neural Network (ANN) di Sub Das Brantas Hulu Suhartanto, Ery; Cahya, Evi Nur; Maknun, Lu’luil
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 10, No 2 (2019)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2019.010.02.07

Abstract

Discharge data is usually less available than rainfall data, so it is necessary to find a relationship between river flows that are applied in the period available rainfall data in a watershed area. The purpose of this study is to determine the suitability of the method based on the analysis of data validation between the observed discharge and the model discharge. The method is done by modeling the discharge based on rainfall with the Artificial Neural Network (ANN) MATLAB R2014b program. The Upper Brantas Watershed is used as a case study because it often has runoff problems. Validation of the ANN method was tested with Root Mean Square Error (RMSE), Nash-Sutcliffe Efficiency (NSE), Correlation Coefficient (R) and Relative Error (KR). From the results of calibration using the ANN Model, the best data is found in the five years data of epoch 500. Verification results based on the value of R have a relatively good relationship between observation discharges with model discharges. The validation results show the validity in a year data of epoch 500.
Analysis of Drainage Capacity and Rehabilitation Subjected to Rainfall and Reverse Flow of Marengan River as a Main Drain in Sumenep City, Indonesia Cahya, Evi Nur; Andawayanti, Ussy; Resmani, Eva
Civil and Environmental Science Journal (CIVENSE) Vol 1, No 2 (2018)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2018.00102.5

Abstract

Land use changing in Sumenep city in recent years has caused runoff in several locations. Therefore, rehabilitations of existing channel to suit the surface runoff are needed. This paper presents capacity determination of existing drainage channels subjected to rainfall with 5-year flood discharge plan and consideration of sea tides effect to Marengan River which crossed Sumenep city. The proposed flood control methods in Sumenep city area was also discussed. The catchment of specified rural area was modelled using SWMM instrument to compare channel conditions before and after rehabilitation. Channel size and height of water level in channel due to rainfall together with the effect of backwater occurred in Marengan River caused by the sea tides was observed during the time. From the analysis, it was found that most of existing secondary drainage channels are uncapable to accommodate rainfall with 5-year flood discharge plan. From the available eight secondary drainage channels outlets, the last three outlets were subjected to reverse flows effect in Marengan River due to sea tides. In order to reduce the occurance of surface runoff inundation, secondary drainage channel rehabilitation was planned at each outlet, and these proven capable to accommodate rainwater runoff and reverse flow as well
Analisa Struktur Pelimpah Bendungan Lubuk Ambacang Kecamatan Hulu Kuantan Kabupaten Kuantan Singingi Provinsi Riau Sholawatini, Nur; Cahya, Evi Nur; Suprijanto, Heri
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 10, No 2 (2019)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1287.098 KB) | DOI: 10.21776/ub.pengairan.2019.010.02.06

Abstract

Lubuk Ambacang Dam is Roller Compact Concrete Dams and located on the Indragiri River, where the overflow spillway structure also important part of the dam. The purpose of this study is to find out the critical area in the structure when an earthquake occurs. Hydraulic analysis determine the appropriate spillway width. Stability analysis is find out that the planned structure is safe from overturning and sliding. The bearing capacity of the soil is also analyzed to determine whether the soil structure has sufficient capacity to withstand the structure load. Structure load are analyzed in normal conditions, Operating Basic Earthquake (OBE) and Maximum Design Earthquake (MDE). Planned of spillway structure based on the analysis of shell plates using STAADPro V8i application. Result of this study, spillway width is 51 meters which is safe from overturning and sliding. Bearing capacity of the soil is able to withstand the structure stress. The results of STAAD.Pro V8i show that the spillway critical area occurs in the upstream part of spillway when the reservoir water conditions are normal and when the OBE occurs. Whereas the Probable Maximum Flood (PMF) condition, critical area is in chuteway channel. For the stilling basin, the critical area occurs in the upper structure when the conditions are Q100th, 1.25Q100th normal and during an OBE.
The Influence of Damage to the Geomembrane Layer on the Seepage Pattern and Discharge at the Homogeneous Embankment Dam Wijayanto, Achsin; Juwono, Pitojo Tri; Cahya, Evi Nur
Civil and Environmental Science Journal (CIVENSE) Vol 4, No 1 (2021)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2021.00401.7

Abstract

Placing the geomembrane layer on the upstream slope can control the seepage in homogeneous dams. Poor geomembrane design, construction and maintenance caused damage to the geomembrane that caused a leak through the dam body. This study discusses the effect of damage on the geomembrane layer at the homogeneous embankment dam on the seepage pattern and discharge. The study location is in the Sianjo Anjo dam, Aceh Singkil district, a homogeneous dam with a geomembrane layer located in the dam body's upstream part. The damage of the geomembrane layer is assumed caused by the various defect of locations and size. The results show that the seepage pattern (phreatic line) tends to be weak in the geomembrane layer without damage.  Meanwhile, if the geomembrane layer is damaged, the larger the defects' width, the higher the phreatic line. However, the seepage pattern that occurs shows insignificant or almost the same. The seepage discharge increases with increasing defect width and decreasing defect location.
Integrated Urban Drainage Management for Flood Inundation Controlling in Sidokare Area at Sidoarjo Regency Cahya, Evi Nur; Guntoro, Dani Eko; Harisuseno, Donny
Civil and Environmental Science Journal (CIVENSE) Vol 2, No 2 (2019)
Publisher : Fakultas Teknik UB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2019.00202.3

Abstract

Flood and inundation had become a serious problem in Sidoarjo Regency annually. This study aimed to apply integrated urban drainage management for flood inundation controlling at Sidokare Region in Sidoarjo Regency. This integrated drainage management consisted of retarding pond, drainage channel redesign, and pump utilization. The study region was divided into Sidokare Pump station, Sepande, and Diponegoro Street catchment area. Rainfall intensity during historical floods was analysed using Mononobe formula and Log Pearson Type III method was used to analyze design rainfall. From the result of the analysis, it wasfoundthat thehistoricalfloodsinstudyregioncausedbyrainfall withreturnperiodof1.01 years, with rainfall intensity of 17.55 mm/hour. It was also found that by implementing this integratedurbandrainagemanagementatSidokareRegion,floodcouldbereducedupto100%. ForSidokarePumpStationcatchmentarea,theinundationmanagementwasconductedbyusing combination of storage pool, existing drainage channel, and the existing flood pump. For Sepandecatchmentarea,itwasmanagedtousethecombinationofstoragepoolandtheexisting drainage channel. Meanwhile, Diponegoro Street catchment area was solved by utilizing new flood pump combining with new tertiary channel and existing drainagechannel.
UPAYA PENINGKATAN KUAT TEKAN MORTAR DENGAN MENGGUNAKAN BAKTERI PENGENDAP CACO3 Kistanti, Ida Fitri; Arifi, Eva; Cahya, Evi Nur
Jurnal Mahasiswa Jurusan Teknik Sipil Vol 1, No 2 (2021)
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Penggunaan material beton semakin meningkat karena memiliki sifat yang kuat, ketahananyang tinggi, mudah dibentuk, relatif murah dan mudah didapatkan. Namun umum terjadifenomena keretakan pada penggunaan beton yang dapat mengakibatkan mudah masuknyapartikel korosif yang akan merusak struktur dalam beton. Oleh karena itu, salah satualternatif untuk mengurangi retakan yang terjadi dilakukan dengan upaya peningkatan kuattekan mortar yang merupakan unsur penyusun beton menggunakan bakteri sebagai agenbiologis yang ramah lingkungan. Penelitian ini dilakukan dengan melakukan pengujiankarakteristik material pasir, kuat tekan dan modulus elastisitas mortar menggunakan isolatbakteri Micrococcus luteus strain S17 dan isolat R20. Hasil Pengujian diolah menggunakangrafik hubungan kuat tekan mortar dengan jumlah densitas sel bakteri (105, 106, dan 107sel/mL) terhadap kuat tekan mortar kontrol pada usia 7,14 dan 28 hari. Hasil dari penelitianmenunjukkan bahwa mortar dengan menggunakan bakteri pengendap CaCO3 dapatmemberikan pengaruh peningkatan kuat tekan mortar. Mortar bakteri yang memberikan efekpeningkatan kuat tekan lebih baik adalah bakteri R20 dengan densitas sel 105 sel/mL padausia 28 hari yakni sebesar 13% dengan kuat tekan sebesar 33,47 Mpa dibandingkan denganmortar kontrol sebesar 29,6 Mpa dan mortar bakteri S17 sebesar 31,4 Mpa. Penggunaan duajenis isolat bakteri memiliki pengaruh dan karakteristik yang berbeda pada kuat tekan mortardilihat dari perbandingan variasi konsentrasi dan usia mortar terhadap kontrol.Kata kunci: Mortar, Kuat Tekan, Bakteri Pengendap CaCO3, Modulus Elastisitas
Pengaruh Posisi Kemiringan Vertikal dan Horizontal terhadap Kemampuan Infiltrasi dan Permeabilitas Beton Porous dengan Recycled Aggregate Safitri, Kiki Windi; Cahya, Evi Nur; Haribowo, Riyanto
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 12, No 1 (2021)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2021.012.01.03

Abstract

AbstrakPeningkatan pembangunan infrastruktur mengakibatkan perubahan tata guna lahan yang meminimalkan laju infiltrasi dan meningkatkan limpasan permukaan. Dibutuhkan alternatif penanganan yang tepat dalam mengatasi genangan air yaitu dengan penggunaan beton porous sebagai tutupan lahan. Limbah beton dimanfaatkan dalam pembuatan beton porous sebagai pengganti agregat kasar, yang disebut Recycled Coarse Aggregate (RCA). Untuk mengetahui kemampuan beton porous dalam mengatasi limpasan air pada permukaan miring dilakukan penelitian mengenai pengaruh kemiringan beton porous dengan agregat daur ulang terhadap kemampuan infiltrasi dan permeabilitasnya. Pengujian infiltrasi dilakukan pada kemiringan horizontal 2% dan kemiringan vertikal 0%, 10%, 20%, 30% menggunakan standar ASTM C 1701/C 1701M – 09. Dari hasil pengujian yang dilakukan, diketahui bahwa kemiringan vertikal dan horizontal beton porous mempengaruhi kemampuan infiltrasinya. Laju infiltrasi pada beton porous semakin berkurang seiring dengan bertambahnya kemiringan vertikal. Jenis agregrat juga diketahui mempengaruhi kemampuan permeabilitas beton porous. Beton porous dengan recycled coarse aggregate (RCA) memiliki kemampuan permeabilitas yang lebih besar dibandingkan dengan beton porous dengan natural coarse aggregate (NCA).AbstractIncreased infrastructure constructions have resulted in land-use change which minimizes water infiltration into the soil and increases the amount of surface runoff. An alternative solution is needed to handle puddles, which is by using pervious concrete as land cover. Concrete waste is used as a substitute for coarse aggregate, which is called Recycled Coarse Aggregate (RCA). To determine the ability of pervious concrete to overcome water runoff on sloping surfaces, a study was conducted to identify the effect of the tilt position of pervious concrete on its infiltration rate and permeability. The infiltration test is carried out with a 2% of horizontal tilt and 0%, 10%, 20%, 30% vertical tilt following the procedures of  ASTM C 1701/C 1701M – 09. Based on the results of the research, it can be concluded that the vertical and horizontal tilt position on previous concrete affects the infiltration rate. And the type of aggregate does affect the permeability of pervious concrete, pervious concrete with recycled coarse aggregate (RCA) has greater permeability than pervious concrete with natural coarse aggregate (NCA).
Pemodelan Numerik Bangunan Peredam Energi Bendungan Pomalaa dengan Analisa Komputasi Fluida Dinamis Dermawan, Delivean Rakha; Cahya, Evi Nur; Sisinggih, Dian
Jurnal Teknik Pengairan: Journal of Water Resources Engineering Vol 12, No 2 (2021)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.pengairan.2021.012.02.06

Abstract

Pada pengujian model fisik pelimpah Bendungan Pomalaa, peredam energi model seri 4 yang memiliki elevasi dasar +41,00 m telah mampu meredam energi aliran dengan baik pada debit Q100th, Q1000th, dan QPMF, namun perlu dicoba alternatif desain peredam energi yang lebih efektif dan efisien. Metode yang digunakan adalah simulasi model numerik berbasis Computational Fluid Dynamics (CFD), kemudian hasilnya akan diverifikasi dengan model fisik menggunakan Brier-Skill Score (BSS). Setelah itu, dilakukan alternatif desain berupa variasi elevasi dasar peredam energi, yaitu +42,00 m; +43,00 m; dan +44,00 m, kemudian dipilih model terbaik sebagai rekomendasi dari hasil simulasi. Hasil verifikasi model numerik menggunakan BSS menunjukkan bahwa model numerik cukup mampu untuk merepresentasikan model fisik. Hasil simulasi terbaik adalah peredam energi dengan elevasi dasar +42,00 m dengan efisiensi peredaman pada Q100th, Q1000th, dan QPMF berturut-turut sebesar 93,846%, 85,915%, dan 83,201%. Kemudian pada debit Q100th, Q1000th, dan QPMF di bagian hilir memiliki nilai bilangan Froude 0,770, 0,995, dan 1,472.In the physical model testing Pomalaa Dam spillway, the series 4 energy dissipator which has a base elevation of +41,00 m has been able to dissipate the flow energy well at the Q100y, Q1000y, and QPMF, but it is necessary to try alternative designs that more effective and efficient. The method used is a numerical model simulation using an application based on Computational Fluid Dynamics (CFD), then the result will be verified with physical model using Brier-Skill Score (BSS). After that, an alternative design was carried out in the form of a variation in the base elevation of the energy dissipator, that are +42,00 m; +43,00 m; and +44,00 m, then the best model is selected as a recommendation from the simulation result. The result of the verification of the numerical model using BSS show that numerical model is quite capable of representing the physical model. The best simulation result is an energy dissipator with a base elevation of +42,00 with efficiency of energy dissipation at Q100y, Q1000y, and QPMF respectively 93,846%, 85,915%, and 83,201%. Then Q100y, Q1000y, and QPMF at the downstream have Froude number value respectively 0,770, 0,995, and 1,472.
Co-Authors Dermawan, Delivean Rakha Dian Sisinggih Donny Harisuseno Ery Suhartanto Eva Arifi Guntoro, Dani Eko Heri Suprijanto Kistanti, Ida Fitri Maknun, Lu’luil Pitojo Tri Juwono Resmani, Eva Riyanto Haribowo Safitri, Kiki Windi Sholawatini, Nur Ussy Andawayanti Wijayanto, Achsin