M Rahnuma^[1]*, M M H Chowdhury², T R Ferdousi³, A Ahmed⁴, and N Ahmed⁵

¹Department of Civil Engineering, Rajshahi University of Engineering and Technology, Rajshahi, Bangladesh 6204.

²Department of Civil Engineering, Sylhet Engineering College, Sylhet, Bangladesh 3100

³Department of Civil Engineering, Chittagong University of Engineering and Technology, Chittagong, Bangladesh 4349

⁴Brown University, Providence, Rhode Island, USA 02912.

⁵Researcher, National Nanotechnology Research Center, Bilkent University, Ankara, Turkey.

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

DOI: https://doi.org/10.20885/icsbe.vol4.art40

ABSTRACT

Over the last few decades, significant damages have been observed in our environment. Being a densely populated country, Bangladesh has also faced significant environmental challenges over the last couple of years. To understand the pattern, researchers have analyzed land coverages in several parts of the world. This study presents an analytical study of the land coverages and land transition maps of the Rajshahi City located in Bangladesh. Our study was focused on the 1990,1998,2007,2014, and 2021 years. The maps were generated using ArcGIS 10.8 software. From our results, we observed that there was significant vegetation loss in the selected region over the years. The reduction in vegetation area is determined by a trend line of 0.8291% per year starting from 1990. Previous studies have shown that trees absorb the pollutants from the air and make the air cleaner. In this study, several graphs showing the decreasing rate of the absorption of air pollutants due to decreasing rate of vegetation are manifested. The increasing rate of air pollutants causes several life-threatening diseases and contributes to the rising temperature. To cope with this vegetation loss, we have proposed a partial solution that is rooftop gardening which supports Urban planning management with greenery.

Keywords: Vegetation; Remote sensing; Air pollutants; Rooftop gardening.

REFERENCES

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Chowdhury, M. H., Eashat, Md. F. S., Sarkar, C., Purba, N. H., Habib, M. A., Sarkar, P., & Shill, L. C. (2020). Rooftop gardening to improve food security in Dhaka city: A review of the present practices. International Multidisciplinary Research Journal, 17–21. https://doi.org/10.25081/imrj.2020.v10.6069

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Islam, M. M., Sharmin, M., & Ahmed, F. (2020b). Predicting air quality of Dhaka and Sylhet divisions in Bangladesh: a time series modeling approach. Air Quality, Atmosphere and Health, 13(5), 607–615. https://doi.org/10.1007/s11869-020-00823-9

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Uddin, M. J., Khondaker, N. A., Das, A. K., Hossain, M. E., Masud, A. D. H., Chakma, A. S., Nabila, N. A., Saikat, M. I., & Chowdhury, A. A. (2016). Baseline Study on Roof Top Gardening in Dhaka and Chittagong City of Bangladesh. August, 46.

J Prayogo^[1]*, F Faris², H C Hardiyatmo³

¹Master student in Natural Disaster Management Engineering, Department of Civil and Environmental Engineering Universitas Gadjah Mada, Yogyakarta, Indonesia

²Directorate General of Human Settlements, The Ministry of Public Works and Housing, South Jakarta, Indonesia

³Department of Civil and Environmental Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia

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

DOI: https://doi.org/10.20885/icsbe.vol4.art38

Abstract.

The Malalayang Beach area is a strategic tourist destination close to Manado city. Arrangement of the area is carried out by building several buildings that can support this area as a tourist destination. Liquefaction is a phenomenon when the soil loses its strength of contact between particles. This is due to earthquake shocks that trigger an increase of water pressure in areas with loose sand characteristics (not dense). The settlement of soil due to liquefaction is a vertical deformation of the soil in the soil layer caused by soil compaction due to earthquakes. The study purpose is to determine how much reduction could occur at the research site as an early stage of the early stages of risk management. With the N-SPT data, the Yoshimine method and the computational method Rocscience Settle 3D can be used to analyze the settlement. Yoshimine method indicates settlement with a very low classification in BH-MLY-01 and high in BH-MLY-05. In RS Settle 3D, the location of BH-MLY-01 has a very low classification, and the location of BH-MLY-05 is dominated by low classification. The maximum settlement resulted from the Rocscience Settle 3D at the BH-MLY-05 location by 11,588 cm.

Keywords: Liquefaction; The settlement of soil; Risk Management

REFERENCES

PT. SOILENS 2021 Laporan Penyelidikan Tanah untuk Proyek Kawasan Pantai Malalayang dan Penataan Ecotourism Village Bunaken Sulawesi Utara Indonesia, PT. SOILENS

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Hermansyah D 2018 SETTLEMENT (PENURUNAN) (Rangkaian dan pembahasan serta penjelasan tentang settlement). Yogyakarta

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SNI 1726:2019 2019 Tata Cara Perencanaan Ketahanan Gempa untuk Struktur Bangunan Gedung dan Nongedung. Jakarta: Badan Standardisasi Indonesia.

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Idriss I M and Boulanger R W 2008 Soil Liquefaction during Earthquake. EERI Publication, Monograph MNO-12, Earthquake Engineering Research Institute, Oakland

Yoshimine M, Nishizaki H, Amano K, and Hosono Y 2006 Flow deformation of liquefied sand under constant shear load and its application to analysis of flow slide in infinite slope, Soil Dynamics and Earthquake Eng. 26, 253–264

Barlett S F, Gerber A P, and Hinckley D 2007 Probabilistic Liquefaction Potential and Liquefaction Induced Ground Failure Map for The Urban Wasatch Front. Collaborative Research. USA: Universitas of Utah and Bringham Young University

Kezia Ruus^1*, Ahmad Rifa’i¹, Agus Darmawan Adi¹

¹Universitas Gadjah Mada, Sleman, Indonesia, 55281

^1*Corresponding email: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art36

ABSTRACT

The Sidoarjo mud volcano is a geological disaster which still erupting after 16 years located in a densely populated. The eruption of Sidoarjo mud volcano is the longest continous disaster that Indonesia has ever experienced. It is known that there is overpressure in subsurface that propagated to the surface throught faults. However, the overpressure generation leads to the increase of pore water pressure, so the effective soil stress decreases. This study aims to estimate the change of pore water pressure and effective stress on the subgrade of Sidoarjo mud volcano due to the subsurface pressure. Furthermore, this study considers the existing embankment and excess pore water pressure due to the consolidation process using Finite Element Method. The results show high active pore water pressure in these area is around -580 kPa, due to the consolidation process is -372 kPa and the contribution of subsurface pressure is -208 kPa. The anomaly of effective stress occur from a depth of -13 m to -30 m. Thus, the reduction of effective stress is around 6%-56% from the ideal conditions with the largest reduction occurred at a depth of -30 m.

Keywords: subsurface pressure, pore water pressure, effective stress

REFERENCES

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Davies R J Brumm M Manga M Rubiandini R Swarbrick R and Tingay M, 2008 The East Java mud volcano (2006 to present): An earthquake or drilling trigger? Earth Planet. Sci. Lett. 272, 3–4 p. 627–638.

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F K Dewi ^1,2*, W Wilopo ¹ and D A Rinaldi², I Azwartika²

¹Departement of Geological Engineering, Universitas Gadjah Mada, Indonesia

²Ministry of Public Works and Housing, Indonesia

^1*Corresponding author: [email protected]

DOI: https://doi.org/10.20885/icsbe.vol4.art34

ABSTRACT

Landslides are disasters that can cause damage to the environment and infrastructure and disrupt community activities, especially in mountainous and hilly areas. Identifying the geometry and some physical characteristics of the landslide material is essential to determining the appropriate mitigation method. This study used electrical resistivity tomography (ERT) to investigate landslides on the spillway slope of Ciawi Dam, West Java. The identification was carried out a 2-D resistivity data along seven profiles over the landslide area using a Dipole-dipole configuration. Borehole data also supported it. Electrical resistivity tomography analysis shows that the northern part of the landslide location is dominated by the water-saturated zone and weathered rocks in the southern part. Borehole data support that the rock at the landslide location consists of tuffaceous sandstone with tuffaceous clay inserts that are moderate to highly weathered. The resistivity data from the line recorded along the axis of the landslide also indicated the failure surface.

Keywords: landslides, electrical resistivity tomography, dry dam

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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