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IDENTIFYING URBAN FLOODS BASED ON HEC-RAS, SWMM, AND GOOGLE EARTH ENGINE

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

R M S Prastica^[1]^*, M A N Shulthony², and A P Kinanti³

¹Waterworks Construction Technology, Public Works Polytechnic, Ministry of Public Works and Housing, Semarang, Central Java, Indonesia
²Postgraduate student, Civil and Environmental Engineering Department, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
³Water Resource Directorate, Ministry of Public Works and Housing, Jakarta, Indonesia

[1]^*Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art32

Abstract.

Urban water-related disasters are a commonly occurring event including in Indonesia. According to recent news, a watershed in South Sumatera submerged due to heavy rainfall and other factors. This study focuses on the Musi River, Palembang. It studied the two alternatives of flood mitigation in the Musi River system, namely hydraulics modification and green infrastructure landscape. The research methodology of the paper covers hydrological analysis, hydraulics, and slope stability calculation by using Google Earth Engine, 1-D HEC-RAS and Geo-Studio software, and green infrastructure simulation by employing SWMM analysis. The hydraulics modification appears to be able to lessen the flood in the watershed with a 100% reduction. Meanwhile, green infrastructure installation provides a 12.5% reduction in water volume in the study area. The government could opt after dealing with their infrastructure budgeting and environmental condition.

Keywords: Urban Floods, HEC-RAS, and SWMM

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R. M. S. Prastica and D. Wicaksono, “Integrated multimodal disaster mitigation management for urban areas: A preliminary study for 2-d flood modeling,” IOP Conf. Ser. Mater. Sci. Eng., vol. 650, no. 1, 2019.

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SORIK MARAPI POWER PLANT DISASTER PREPAREDNESS LEVEL

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

A R P Negara^[1],2*, Sarwidi², F Nugraheni²

¹KS ORKA

²Universitas Islam Indonesia

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art31

Abstract.

Sorik Marapi Geothermal Power (SMGP) is one of the largest developing geothermal projects in Indonesia. This project is located in Mandailing Natal Regency, North Sumatera Province. KS ORKA acquired the majority shares of the company in mid-2016 and since then the project has completed drilling program for 18 wells and confirmed at least 55 MW of proven resources. The project aims to connect 240 MW power to The PT PLN grid. The Steam field Diagram Options (SAGS) conceptual design based on the wellpad separation concept with the separated fluids running the Well Head Units (WHU) installed within the production well pad. This SAGS concept is a decentralized system with shorter pipelines per plant. The SAGS concept has the advantage of a faster time to see its development compared to the traditional concept. High risk of that could occurs during geothermal exploration and development activities identifying risks of geohazard in early phase of geothermal development plan might cause some problems and catastrophic events such as damages on infrastructure, well pad, road access, pipeline, well leaks or broken, impairment of power plant facilities, and following cessation of electricity production. Moreover, these events also could affect the nature or environment surrounding the field and results fatality or loss of human lives. Therefore, it is very critical to have a well – structured and comprehensive method as a guide to identify and mitigate the geohazard risks. The aim of this study is to gathers and reviews disaster preparedness level in SMGP Project area especially geohazard such as earthquake and landslide. Evaluation of existing building using FEMA P-154 and ASCE 41-17 Tier 1 and 2 also explained on this study.

Keywords: Sorik Marapi, Disaster Preparedness Level, Geothermal Power

References

Vicky R. Chandra, Dorman Purba, Arthur G.P. Nayoan, Ferdino R. Fadhillah, Rizki Fadhilah Ramadhan, Rio Anggara. “Identifying and Assessing Geohazard in Indonesia Geothermal Area: How Difficult Is It?” PROCEEDINGS, 46th Workshop on Geothermal Reservoir Engineering, 2021: 1

Aditya R.P. Negara, Dicky Hermana, Anggita Mahyudani Rangkuti. ” Construction of Sorik Marapi, the Fastest Geothermal Power Plant ” IIGCE 8^th 2022

Bencana, Badan Nasional Penanggulangan. Indeks Resiko Bencana Indonesia. Jakarta: Badan Nasional Penanggulangan Bencana, 2019.

SEISMIC GROUND RESPONSE ANALYSIS FOR LIQUEFACTION ASSESSMENT IN BUNAKEN, NORTH SULAWESI, INDONESIA

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

R E Majid ^1,2, F Faris¹^*, A Rifa’i¹

¹Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia

²PT Nindya Karya (Persero), Gedung Nindya, East Jakarta 13630, Indonesia

^1*Corresponding author: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art30

ABSTRACT

Bunaken Island is a quaternary deposit of Holocene age. Dominating sand layers, shallow groundwater table, and near active fault locations make the area highly susceptible to liquefaction. This study aims to determine the minimum ground acceleration that can potentially trigger liquefaction in the area. In this study, earthquakes originating in the North Sulawesi Thrust were modelled with various magnitudes. PGA was calculated using the attenuation function from : Liu and Tsai (2005), Abrahamson et al. (2016), Atkinson and Boore (2003), and Zhao et al. (2006). Each earthquake parameter was analyzed for its liquefaction potential using the simplified procedure by Idriss and Boulanger (2008), and then the minimum earthquake parameter value that can cause liquefaction was determined. The analyses show that the study site has the potential for liquefaction if more than Mw 5.8 earthquake occurs with a PGA value of above 0.17g. The BKN-BH02 borehole is the most critical point of the four boreholes made at the study site.

Keywords: seismic, ground response, liquefaction

REFERENCES

Warouw A G D Manoppo F J and Rondonuwu S G, 2019 Analisis potensi likuifaksi dengan menggunakan nilai SPT (Studi kasus : Jembatan Ir. Soekarno Manado) J. Sipil Statik 7, 11 p. 1453–1464.

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THE APLICATION OF URBAN INFILL TECHNIQUE ON BUILDING CONCERVATION METHOD WITH A CASE STUDY OF JAVA TRADITIONAL HOUSE IN YOGYAKARTA

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

T K Wibisono^[1]^*

¹ University Islam Indonesia, Yogyakarta, Indonesia

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art29

ABSTRACT

The rapid development of the city tends to create new strategic value in the area so as to encourage changes / shifts in the function of the area and often sacrifice the existence of old buildings in the area. Most of these old buildings were changed/demolish without regard to the historical value and uniqueness of the building/area or genius loci to be converted into new buildings with new functions only because of the reason for the investment value of the new commercial function of the property. Without realizing it, this building change will change the value of the area that has been formed so that the sustainability aspect of the old area stops and loses direction. There are several technical factors of the old building, such as: lay-out / spatial planning, appearance and use of old building materials that do not keep up with the times are often the main causes of this demolition. This demolition problem can actually be reduced in intensity by using the old building revitalization method that applies the urban infill technique of new buildings on the old building site. By using this technique, the existence of the old building can still be maintained while synergizing with the infill building on the new/updated function. However, it is necessary to pay attention to several important factors that determine the application of this urban infill technique, which in this paper tries to reveal what technical factors play an important role through a case study of the application of urban infill in old Javanese traditional houses. The results obtained are several design directions that need to be considered in the application of urban infill building techniques.

Keywords: urban infill techniques, building concervation, java traditional house

REFERENCES

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Budiharjo, Eko. (1997). Architecture Development and Conservation, Jakarta. Djambatan Publisher.

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INVESTIGATING THE EFFECTIVENESS OF BANGER RIVER FLOODWAY ON REDUCING WATER LEVEL OF LOJI RIVER IN PEKALONGAN CITY USING HEC-RAS 1D MODEL

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

E O Nugroho^[1]^*, R Ramadhani², P Lutfitiana³, M Cahyono¹, S Lestari⁴, and YKumala⁵

¹ Institute Teknologi Bandung

² Sumatera River Basin VI, Ministry of Public Works and Housing, Jambi

³ Directorate General of Water Resources, Ministry of Public Work

⁴ Directorate of Dams and Lakes, Directorate General of Water Resources

⁵ Research Center for Water Resources, Ministry of Public Works and Housing

[1]^* Corresponding author’s email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art28

ABSTRACT

Pekalongan City is a lowland area and located in the northern part of Java Island. Tidal flooding often occurred at high tide when the wave run-up entered the mainland and inundated several areas in the city of Pekalongan. The inundation area in Pekalongan City reached 618 Ha in 2020. Tidal flooding became a problem because it inundated vital areas such as residential areas, public spaces, and economic centers. The area that often experiences inundation is in the area of the Loji River and the Banger River estuarine, which is a unified system on the Pekalongan River. The inundation due to tidal flooding will be more severe if it coincided with the occurrence of high discharge in the river flow. To control floods and tidal floods in the city of Pekalongan, flood control engineering was needed so a floodway known as the Banger River was built. This approach aims to reduce the area of inundation and protect existing vital areas. This study aims to assess the impact of the Banger River on reducing water level in the Loji River. The methodology used in this study is flood modeling with HEC-RAS 6.1 one dimensional model. The simulation results show that after the Banger river floodway was made, the water level in the Loji river 1.7 meters or 28% of the water level in the Loji River can be reduced.

Keywords: Banger River, Floodway, HEC-RAS

REFERENCES

Arturo Leon, (2013). Tutorial on Using HECGeo RAS 10.1 with Arc GIS 10.1 and HEC-RAS 4.1.0 for Flood Inundation Mapping in Steady and Unsteady Flow Conditions, School of Civil and Construction Engineering, Oregon State University.

BBWS Pemali Juana, Review Detail Desain Pengendalian Banjir dan Rob Kota dan Kab. Pekalongan, 2020, Indonesia.

Chow V.T., Maidment D.R., Mays L.W., 1988, Applied Hydrology, Mc. GrawHill Book Company, Singapore.

Grimaldi, Salvatore, etl., 2013, Flood Mapping in Ungauged Basins Using Fully Continuous HydrologicHydraulic Modeling. Journal of Hydrology, Elsevier, 487, 39-47

Riza Inanda Siregar, Ivan Indrawan., 2017, Comparative Study of 1-D (One Dimension) and 2-D (Two Dimension) Modeling in Modeling Flood in Hulu Citarum Watershed., Jurnal Education building., Volume 3, Nomor 2, December 2017: 31-37.

Rahmawati, I. P., & Ardhiani, N., 2008, Flood Control System of Sengkarang River. Doctoral dissertation, Faculty of Engineering Diponegoro University.

US ARMY Corps of Engineers. (2010). HECRAS River Analysis System: User’s Manual. US Army Corps of Engineers, Washington.

THE IMPLICATION RISK-IMPACT OF PROJECT ACCELERATION ON PAVEMENT RUNWAY

December 18, 2023/0 Comments/in Prosiding 2022/by icsbeuii

A Suraji¹, F Nugraheni¹, and T N Sulistyantoro^[1]^*

¹ Master Civil Engineering, University Islam Indonesia, Yogyakarta, Indonesia

[1]^* Corresponding author’s email: tri.nugroho.sulistyantoro@uii.ac.id

DOI: https://doi.org/10.20885/icsbe.vol4.art27

ABSTRACT

The process of building a new Yogyakarta airport in Kulon Progo District or New Yogyakarta International Airport (NYIA) continues to accelerate. The document on the analysis of environmental impacts (Amdal) is still in the process of preparation. Airport development, has implications for productive land grabbing, settlement evictions, lost probability at the site plan and at the location of supporting infrastructure. In fact, there was no study on tsunami risk reduction in the formulation of environmental impact (Amdal), so there is no guarantee of safety. On the analysis of the risk probability in the pavement runway project is divided into five probabilities of risk for three samples. In calculating risk, it is divided into three project acceleration assumptions, namely the assumption of a duration of 50% or 7 weeks, 40% or 6 weeks and 25% or 4 weeks from normal duration 14 weeks. Risk probability is obtained from the probability of the event and the probability of the impact. The highest loss is in 4 weeks duration (25% assumption) where has a total loss 308,638,309.40 rupiahs. The smallest loss is in normal duration 14 weeks where has a total loss 108,444,489.74 rupiahs. the relationship between probability and project acceleration is found. Where, there is an increase in the probability of a duration of 4 weeks by 0.17459% and a decrease in the probability of a normal duration of 14 weeks by 0.0618%.

Keywords: risk impact, pavement runway, risk probability

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