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Analisis Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) Studi Kasus : Sungai Air Anak (Hulu Sungai Way Besai) Dwiyanto, Very; Kusumastuti, Dyah Indriana; Tugiono, Subuh
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 4 No. 3 (2016): Edisi September 2016
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v4i3.424

Abstract

This research was conducted in order to calculate the reduction in electrical power that can be generated by a micro-hydro power plant in Air Anak river. The decline in power at the micro-hydro power plant Air Anak river is caused by the presence of sediments that accumulate in the weir micro-hydro power plants, so that reduced water storage that can be streamed to a penstock pipe to generate electrical power. In this study, carried out calculations mainstay river discharge Air Anak by comparison mainstay river discharge Way Besai obtained from the data processing streamflow recorder at the hydroelectric plant reservoirs Way Besai for 11 years from 2004 to 2014 using the Flow Duration Curve method, calculation of electric power generated from the design discharge on micro-hydro power plant Air Anak, calculation of reduction in electrical power at the micro-hydro power plant Air Anak. From the research, design discharge value obtained micro-hydro power plant Air Anak is equal to 0,2565 m3/s with power generated by 2,1962 kW. Power reduction is calculated based on measurements taken 2 times. In streamflow measured at 1,1923 m3/s, water can flow into the pipe by 7 cm generate a discharge of 0,0592 m3/s. Power that can be generated at 1,2326 kW or by 56,12 % of the generated design power. In streamflow measured at 0,5788 m3/s, water can flow into the pipe by 4 cm generate a discharge of 0,0189 m3/s. Power that can be generated at 0,4062 kW or by 18,50 % of the generated design power. Keywords : micro hydro, flow duration curve, electricalpower
Analisis Hidrologi dan Hidrolika pada Saluran Drainase Ramanuju Hilir Kotabumi (Menggunakan Program HEC-RAS) Mustofa, Muhammad Jazuli; Kusumaastuti, Dyah Indriana; Romdania, Yuda
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 3 No. 2 (2015): Edisi Juni 2015
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v3i2.461

Abstract

The calculation is done using the rainfall data obtained from BMKG Kotabumi North Lampung,from 1998 until 2011 with time increment in minutes. The Log Pearson III method is used to findthe design rainfall with return period 2 years, 5 years and 10 years. Then the result isimplemented in the Intensity-duration-frequency (IDF) curves. Time of concentration is linked intothe IDF curves to determine rainfall intensity. Based on the calculated rainfall intensity, thedesign discharge for each return period can be calculated using the rational method.The values of design discharge are then inputted as upstream boundary condition in HEC-RAS.Model output are presented in cross and long section to determine at which return period thedrainage capacity is overflowed. Simulation using HEC-RAS were also done to determine thechannel capacity.Based on the results of this research, it can be concluded that rainfall intensities are 52,6918mm/hour, 65,7820 mm/hour and 75,9032 mm/hour, for 2, 5, an 10 year return period respectively.The capacity of the drainage channel is 2.02 m 3 /hour and is expected to be exceeded on 5 yearsreturn period.Key words : Intensity, Rasioanal method, HEC-RAS, capacity
Analisis Hidrologi Untuk Penentuan Debit Banjir Rancangan di Bendungan Way Besai Nivitha, Mutya; Winarno, Dwi Joko; Kusumastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 5 No. 2 (2017): Edisi Juni 2017
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v5i2.785

Abstract

AbstractResource which is often used for energy source is water as hydro power plant. One of hydro power plant in Lampung province is Way Besai Hydro Power Plant. Considering the importance of this hydro power plant for people, extreme things on the hydro power plant like flood, certainly not desirable. Hydrologic analysis required for get result that was flood design as action anticipation.This study was conducted in Way Besai watershed, Sumber Jaya, West of Lampung. The data required of this study are rainfall data from five stations, flow Way Besai data from 1986 to 2000, and daily rainfall data from two station.From frequency analysis, obtained design flood for the largest single data group return period of 2 years is return period 5 years 131,00 m3/s, return period 10 years 178,42 m3/s, return period 25 years 253,71 m3/s, return period 50 years 322,66 m3/s, return period 100 years 403,45 m3/s, and 499,81 m3/s for return period 200 years. From HEC-HMS, the flood design for return period 2 years sebesar 71,2 m3/s, return period 5 years 90,6 m3/s, return period 10 years 105,7 m3/s, return period 25 years 128,6 m3/s, return period 50 years 156,6 m3/s, return period 100 years 190,8 m3/s and 233,7 m3/s for return period 200 years. Based on calibration result used RMSE, obtained RMSE value is 3,12. Keywords: watershed, design flood, Way Besai, HEC-HMS
Analisis Hidrologi Untuk Penentuan Debit Banjir Rancangan di Bendungan Way Besai Nivitha, Mutya; Winarno, Dwi Joko; Kusumastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 6 No. 1 (2018): Edisi Maret 2018
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v6i1.791

Abstract

AbstractResource which is often used for energy source is water as hydro power plant. One of hydro power plant in Lampung province is Way Besai Hydro Power Plant. Considering the importance of this hydro power plant for people, extreme things on the hydro power plant like flood, certainly not desirable. Hydrologic analysis required for get result that was flood design as action anticipation.This study was conducted in Way Besai watershed, Sumber Jaya, West of Lampung. The data required of this study are rainfall data from five stations, flow Way Besai data from 1986 to 2000, and daily rainfall data from two station.From frequency analysis, obtained design flood for the largest single data group return period of 2 years is return period 5 years 131,00 m3/s, return period 10 years 178,42 m3/s, return period 25 years 253,71 m3/s, return period 50 years 322,66 m3/s, return period 100 years 403,45 m3/s, and 499,81 m3/s for return period 200 years. From HEC-HMS, the flood design for return period 2 years sebesar 71,2 m3/s, return period 5 years 90,6 m3/s, return period 10 years 105,7 m3/s, return period 25 years 128,6 m3/s, return period 50 years 156,6 m3/s, return period 100 years 190,8 m3/s and 233,7 m3/s for return period 200 years. Based on calibration result used RMSE, obtained RMSE value is 3,12. Keywords: watershed, design flood, Way Besai, HEC-HMS
Sediment Analysis in the Way Besai Hydroelectric Watershed Using the USLE Method (United Soil Loss Equation) Rahmawati, Fitriya; Winarno, Dwi Joko; Kusumastuti, Dyah Indriana
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 6 No. 4 (2018): Edisi Desember 2018
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v6i4.1018

Abstract

Way Besai hydropower station is located in Way Besai river basin (watershed) with most watersheds surrounded by mountains that cause erosion resulting in sediment buildup. The purpose of this research is to know the degree of erosion hazard and to know the sediment by the Universal Soil Loss Equation (USLE) method in Way Besai Watershed. The location of this research was conducted at Way Besai Sub River Watershed, Tulang Bawang Watershed, West Lampung Regency with Way Petai as the control point. The data needed in this research is the limitation of Way Besai Watershed catchment, land use data and land type at Way Besai Watershed catchment area. From the result of sedimentation analysis with USLE method, it can be known that the erosion rate of Way Besai Watershed catchment area is 305.03 ton/ha/year which is classified as Class IV Hazard Erosion or heavy and sedimentation of Way Besai Watershed catchment area is 165.079,13 ton/year.
Analisis Perbandingan Hidrograf Satuan Sintetik Gama I dan SCS (HEC-HMS) dengan Hidrograf Satuan Terukur di Sungai Way Besai Sembiring, Fadhel Dzaki; Kusumastuti, Dyah Indriana; Winarno, Dwi Joko
Jurnal Rekayasa Sipil dan Desain (JRSDD) Vol. 7 No. 1 (2019): Edisi Maret 2019
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v7i1.1117

Abstract

The Way Besai River is located in Sumber Jaya District, West Lampung Regency. River discharge is an indicator of watershed function in transforming rain into stream flow. River discharge is generally presented by hydrograph. There are two methods to derive unit hydrograph, i. e. Measured Unit Hydrograph method (HST) and Synthetic Unit Hydrograph method (HSS). Synthetic Unit Hydrograph is used if the watershed does not have sufficient hydrometry data for calculating flood discharge. The purpose of this study is to analyze Synthetic Unit Hydrograph Gama I, Synthetic Unit Hydrograph SCS (HEC-HMS), and measured unit hydrograph for Way Besai River. The method used in this study includes Synthetic Unit Hydrograph Gama I, Synthetic Unit Hydrograph SCS (HEC-HMS), and Measured Unit Hydrograph. The results of this study show that Unit Hydrograph derived from Synthetic Unit Hydrograph SCS (HEC-HMS) is better than the result derived from Synthetic Unit Hydrograph Gama I based on peak discharge, peak time, base time and base flow values. Keywords: Watershed, Discharge, Synthetic Unit Hydrograph, Measured Hydrograph Unit, SCS (HEC-HMS), Gama I.
Analisis Kelayakan Ekonomi Teknik Investasi Pembangunan Terminal Khusus dalam Mendukung Distribusi Tambang Batu Basalt Windy Putri Diwantari; Ahmad Herison; Kristianto Usman; Ahmad Zakaria; Dyah Indriana Kusumastuti
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1290

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Abstrak   Ketidakefisienan distribusi hasil tambang batu basalt melalui jalur darat mendorong pembangunan Terminal Khusus PT. Optima Nusa Tujuh guna mengoptimalkan distribusi melalui jalur laut. Penelitian bertujuan untuk menentukan skenario investasi paling optimal berdasarkan kelayakan finansial dan kontribusinya terhadap efisiensi distribusi. Metode yang digunakan adalah pendekatan deskriptif dengan teknik kualitatif dan kuantitatif. Analisis kualitatif digunakan untuk mengevaluasi aspek non-finansial, sedangkan analisis kuantitatif menilai kelayakan finansial berdasarkan parameter NPV, IRR, PI, BCR, BEP, dan PBP. Hasil evaluasi terhadap kelima skenario investasi menunjukkan bahwa seluruh skenario layak dilaksanakan dengan nilai NPV positif. Namun, hanya skenario moderat hingga optimis yang memenuhi seluruh kriteria kelayakan. Skenario 5 (optimis 20%) memberikan hasil paling optimal, dengan NPV sebesar Rp65.396.124.689,67, IRR sebesar 34,21%, dan periode pengembalian investasi tercepat selama 3 tahun 2 bulan 4 hari. Kesimpulannya, pendistribusian hasil tambang melalui terminal khusus jalur laut dinilai layak dan memberikan dampak positif secara finansial karena memberikan keuntungan jangka panjang dan efisiensi distribusi terbaik.   Kata kunci: studi kelayakan, terminal khusus, distribusi  basalt, NPV, IRR   Abstract   The inefficiency of basalt distribution via land transportation has prompted the development of a dedicated terminal by PT. Optima Nusa Tujuh to enhance maritime distribution. This study aims to determine the most optimal investment scenario based on financial feasibility and its impact on distribution efficiency. A descriptive method is employed, incorporating both qualitative and quantitative approaches. Qualitative analysis explores non-financial factors influencing project viability, while quantitative analysis evaluates financial feasibility using NPV, IRR, PI, BCR, BEP, and PBP. Analysis of five investment scenarios reveals that all are financially feasible with positive NPV values; however, only moderate to optimistic scenarios fulfill all feasibility criteria. Scenario 5 (20% optimistic) emerges as the most optimal, yielding the highest NPV of IDR 65,396,124,689.67, IRR of 34,21%, and the shortest payback period of 3 years, 2 months, and 4 days. In conclusion, maritime distribution via dedicated terminal is feasible and financially advantageous, ensuring long-term gains and efficient logistics.   Keywords: feasibility study, dedicated terminal, basalt distribution, NPV, IRR
Pola Curah Hujan di Provinsi Indonesia Saat El-Nino dan La-Nina: Analisis Periodogram FFT dan Lomb Melly Nugraheni; Ahmad Zakaria; Endro Prasetyo Wahono; Dyah Indriana Kusumastuti; Ahmad Herison
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2 (2024)
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i2.65646

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Indonesia is a country affected by the El Nino and La Nina climate anomalies. The provinces of Aceh, Central Kalimantan, and Maluku are three regions representing parts of Indonesia that have a variety of rainfall distribution and climatic conditions. This research was conducted to determine the influence of the El Nino and La Nina climate anomalies on these three regions by looking at the areas that have a dominant influence due to these climate anomalies. The research used BMKG Indonesia rainfall data with a total of 16 rainfall stations and a data range of 22 years. The methods used for modeling are the Fast Fourier Transform (FFT) and Lomb Periodogram to obtain rainfall spectrum data. Then, the amplitude value was obtained, and a comparison of the data from the two methods was carried out to determine the recurrence value and the area with the highest impact due to climate anomalies. The results of data analysis according to the FFT and Lomb Periodogram showed that the highest affected area was the eastern part of Indonesia, namely Maluku Province, with the dominant frequency according to the FFT method being 5.61 years with a PSD of 7.67 mm2 and the Lomb Periodogram 6.06 years with a PSD of 18.64 mm2. Based on the average PSD value, using both FFT and Lomb Periodograms, it also shows that the influence of El Nino and La Nina is greatest in the eastern part of Indonesia; as you move towards the west, this influence decreases. The smallest influence occurred in western Indonesia. This shows that the influence of ENSO is more dominant than the influence of IODM.
Analisis Muka Air Banjir terhadap Tutupan Lahan di Sungai Bulok Kabupaten Pringsewu Provinsi Lampung Tiara Maelta Amanda; Dyah Indriana Kusumastuti; Ahmad Zakaria; Ahmad Herison; Endro Prasetyo Wahono
Teras Jurnal : Jurnal Teknik Sipil Vol. 13 No. 2 (2023): Volume 13 Nomor 2, September 2023
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v13i2.957

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Abstrak Sungai Bulok menjadi salah satu Lokasi banjir di WS Seputih Sekampung yang berhasil diidentifikasi. Pada tahun 2017, terjadi banjir besar di Sungai Bulok sehingga mengakibatkan Bendung Gatel (STA 11+00 dari Muara Way Bulok) rusak berat dan juga menyebabkan kerusakan tanggul. Tujuan penelitian ini akan menganalisis Debit Puncak Banjir untuk mengetahui Tinggi Muka Air banjir dengan menggunakan HEC-RAS, serta membahas alternatif untuk mengurangi dampak banjir. Analisis banjir rencana menggunakan metode HSS Nakayashu. Debit puncak banjir Sungai Bulok, untuk kala ulang 20 tahun sebesar 517,02 m3/dt. Profil muka air banjir pada sungai bulok untuk Kala Ulang 2, 5, dan 10 tahun aman dari banjir, sedangkan untuk kala ulang 20 tahun terdapat banjir dari Ruas 1 sampai dengan Ruas 8 sungai Bulok. Untuk alternatif jangka pendek dan menengah diperhitungkan panjang tanggul Untuk mereduksi limpasan yang terjadi dilakukan simulasi hidrolika dengan mengubah tutupan lahan sebanyak 10% sehingga dapat menurunkan Debit Banjir Kala ulang 20 tahun menjadi 313,35 m3/dt atau sebesar 39,39%. Kata kunci: Sungai Bulok, HEC-RAS, tata guna lahan, banjir  Abstract Bulok River is one of the identified flood locations in the Seputih Sekampung Watershed. In 2017, there was a major flood on the Bulok River, causing the Gatel Dam (STA 11+00 from Muara Way Bulok) to be heavily damaged and also causing damage to the embankment. The purpose of this study will be to analyze the Peak Flood Discharge to determine the Flood Water Level using HEC-RAS, as well as discuss alternatives to reduce the impact of flooding. Design flood analysis using the HSS Nakayashu method. The peak flood discharge of the Bulok River, for a 20-year return period, is 517.02 m3/sec. The profile of the flood water level in the bulok river for return periods 2, 5, and 10 years is safe from flooding, while for the 20 year return period there are floods from section 1 to section 8 of the Bulok river. For the short and medium term alternatives, the length of the embankment is calculated. To reduce the runoff that occurs, hydraulic simulations are carried out by changing the land cover by 10% so that it can reduce the 20 year return period flood discharge to 313.35 m3/s or 39.39%. Keywords: Bulok River, HEC-RAS, land use, flood
Pendugaan Hasil Sedimen Terhadap Penggunaan Lahan dengan Metode MUSLE di DAS Way Besai Rifki Ananda Saputro; Dyah Indriana Kusumastuti; Endro Prasetyo Wahono; Ahmad Zakaria; Ofik Taupik Purwadi
Teras Jurnal : Jurnal Teknik Sipil Vol. 14 No. 2 (2024): Volume 14 Nomor 2, September 2024
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v14i2.1101

Abstract

Abstrak Salah satu dampak dari erosi adalah penurunan produksi pangan secara global. Penyebab erosi yang terjadi di wilayah sungai adalah perubahan tutupan lahan dan iklim. Dengan melakukan penghijauan, meningkatkan vegetasi dan ekologi, dan perencanaan penggunaan lahan diindikasikan dapat mencegah erosi. Sedimentasi akibat erosi di sungai juga dapat mengurangi kapasitas sungai dalam menampung air. Metode MUSLE (Modified Universal Soil Loss Equation) merupakan pengembangan metode USLE (Universal Soil Loss Equation) dalam pendugaan hasil sedimen. Tujuan dari penelitian adalah memperoleh pendugaan hasil sedimen terhadap penggunaan lahan menggunakan metode MUSLE pada Daerah Aliran Sungai (DAS) Way Besai berbasis sistem informasi geografis. Hasil sedimen periode ulang dengan metode MUSLE untuk Y(2 tahun), Y(5 tahun), Y(10 tahun), Y(25 tahun), Y(50 tahun), Y(100 tahun), dan Y(200 tahun) masing-masing diperoleh sebesar 656.8765 ton, 782.4091 ton, 861.3319 ton, 957.7598 ton, 1027.6898 ton, 1096.4283 ton, dan 1164.6822 ton. Sedimentasi kala ulang menunjukkan tren peningkatan sejalan dengan bertambahnya lama periode yang berulang. Kata kunci: Sedimen, Erosi, MUSLE, DAS Way Besai  Abstract Erosion leads to a global decrease in food production. Land cover and climate changes are the main causes of erosion in river areas. To reduce erosion, we can implement greening projects, improve vegetation, and plan land use strategically. Sedimentation resulting from river erosion can diminish the water-holding capacity of rivers. MUSLE (Modified Universal Soil Loss Equation) method, which enhances USLE (Universal Soil Loss Equation), is used to predict sediment yield. The objective of research is to estimate sediment yield in relation to land use using MUSLE method within Way Besai Watershed, based on a geographic information system (GIS). Sediment yields for recurrence periods, including Y(2 years), Y(5 years), Y(10 years), Y(25 years), Y(50 years), Y(100 years), and Y(200 years), are calculated as 656.8765 tons, 782.4091 tons, 861.3319 tons, 957.7598 tons, 1027.6898 tons, 1096.4283 tons, and 1164.6822 tons, respectively. Sedimentation rates exhibit an upward trajectory in tandem with increasing recurrence periods. Keywords: Sedimentation, Erosion, MUSLE, Way Besai Watershed
Co-Authors Adenan Yusuf Afandi . Ahmad Herison Ahmad Zaenudin Ahmad Zakaria Ahmad Zakaria Ahmad Zakaria ahmad zakaria Ahmad Zakaria Aji Saputra, Aji Amanda, Tiara Maelta Amini, Rosidah Andandaningrum, Della Andriani, Gustin Anggraini, Witta Putri Anton, Sari Aprizal Arianti, Tanti Aristiani, Widya Asep Sukohar Astika Murni Lubis Astriyana, Mega Ayuningsih, Titik Bayu krishna mukti C.H. Van Rafii Candra Hakim Van Rafi’i Christine Wulandari Citra Dewi D. Jokowinarno Dwi Joko Winarno Dwi Joko Winarno Dwi Joko Winarno Dwi Joko Winarno Dwi Joko Winarno Dwi Joko Winarno Dwi Jokowinarno Dwi Jokowinarno Dwi Jokowinarno Dwiyanto, Very ELOK BUDI UTAMI Endro Prasetyo Wahono F. Yuniarti fadhel dzaki sembiring Falah, M. Najmul Fathony, Awal Rifan Febriyani, Febriyani Fieni Yuniarti Fitriya Rahmawati Fridayanto, Syahlan Naufal Gani, Rama Dian Gultom, Winda Maria Rebecca gustin andriani Hardito, Joni Haris Murwadi Hidayat, Kurnia Ryandani Humaidi Humaidi Humaidi Humaidi Humaidi, Humaidi Irwan Sukri Banuwa Irwan Sukri Banuwa Jundulloh, Panglima juwita novi yana Kristianto Usman kuncoro, wahyu hadi Kusanti, Nency Dwi M. Najmul Falah Mahardika, Siti Mardiyansyah Mardiyansyah Marfirah Ulfah Maulana Yusuf Maulana Yusuf Mega Astriyana Melly Nugraheni Melya Riniarti Muhamad Angga Wicaksono Muhammad Jazuli Mustofa mukti, Bayu krishna Mustofa, Muhammad Jazuli Mutya Nivitha Nency Dwi Kusanti Nengah Sudiane Niken, Chatarina Nivitha, Mutya Nivitha, Mutya Nora Anggraini Noviani, Erina Nur Arifaini Ofik Taufik Purwadi Ofik Taufiq Purwadi Ofik Taupik Purwadi Okta Ainita Panglima Jundulloh Peranginangin, Imanuel Purwadi , Ofik Taupik Purwadi, Ofik Taufiq Purwadi, Ofik Taupik putri, wardatul aini Rahmawati, Fitriya Rama Dian Gani Rian Alfian Rifki Ananda Saputro Riki Chandra Wijaya Riyo Ardi Yansyah Riyo Ardi Yansyah, Riyo Ardi Riza Muhida Robiyanto Robiyanto Robiyanto, Robiyanto Rosidah Amini S Suharno Samsul Bakri Saputro, Rifki Ananda Sari, Dwi Meyta Sembiring, Fadhel Dzaki Siti Nurul Khotimah Slamet Budi Yuwono Slamet Budi Yuwono Sri Ratna Sulistiyanti Subuh Tugiono Subuh Tugiono, Subuh Suharni Suharni Sumiharni . Suprayitno, Meli Susilowati A Syafri Adi Teguh Endaryanto Tiara Maelta Amanda Titik Ayuningsih Tomi, Muhammad Tommy Arisandy Triyanto Triyanto Ulfah, Marfirah Utami, Elok Budi Very Dwiyanto Wahono, Endro Prsetyo wahyu hadi kuncoro Wardatul Aini Putri Wicaksono, Muhamad Angga Widya Aristiani Wijaya, Riki Chandra Winarno, Dwi Joko Winda Maria Rebecca Gultom Windy Putri Diwantari Yana, Juwita Novi Yuda Romdania Yuda Romdania yulianto, alim Zaldi Ronald